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Shao, M., Sheng, H., Lin, L., Ma, H., Wang, Q., Yuan, J., . . . Lan, W. (2023). High-Performance Biodegradable Energy Storage Devices Enabled by Heterostructured MoO3-MoS2 Composites. Small, 19(10), Article ID 2205529.
Open this publication in new window or tab >>High-Performance Biodegradable Energy Storage Devices Enabled by Heterostructured MoO3-MoS2 Composites
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2023 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 19, no 10, article id 2205529Article in journal (Refereed) Published
Abstract [en]

Biodegradable implantable devices are of growing interest in biosensors and bioelectronics. One of the key unresolved challenges is the availability of power supply. To enable biodegradable energy-storage devices, herein, 2D heterostructured MoO3–MoS2 nanosheet arrays are synthesized on water-soluble Mo foil, showing a high areal capacitance of 164.38 mF cm−2 (at 0.5 mA cm−2). Employing the MoO3–MoS2 composite as electrodes of a symmetric supercapacitor, an asymmetric Zn-ion hybrid supercapacitor, and an Mg primary battery are demonstrated. Benefiting from the advantages of MoO3–MoS2 heterostructure, the Zn-ion hybrid supercapacitors deliver a high areal capacitance (181.86 mF cm−2 at 0.5 mA cm−2) and energy density (30.56 µWh cm−2), and the Mg primary batteries provide a stable high output voltage (≈1.6 V) and a long working life in air/liquid environment. All of the used materials exhibit desirable biocompatibility, and these fabricated devices are also fully biodegradable. Demonstration experiments display their potential applications as biodegradable power sources for various electronic devices.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2023
Keywords
biodegradable, heterostructures, primary batteries, supercapacitors
National Category
Materials Chemistry Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-512516 (URN)10.1002/smll.202205529 (DOI)000897753800001 ()36508711 (PubMedID)
Available from: 2023-09-28 Created: 2023-09-28 Last updated: 2023-09-28Bibliographically approved
Hu, Y., Chen, L., Chai, Z., Zhu, J., Wang, Z. L., Zhang, S.-L. & Zhang, Z.-B. (2022). Autogenic electrolysis of water powered by solar and mechanical energy. Nano Energy, 91, Article ID 106648.
Open this publication in new window or tab >>Autogenic electrolysis of water powered by solar and mechanical energy
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2022 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 91, article id 106648Article in journal (Refereed) Published
Abstract [en]

A dual-bandgap photoelectrochemical (PEC) cell with two semiconductors stacked in tandem is a widely adopted concept to capture a large fraction of the solar spectrum for water splitting. While two photons are theoretically needed to produce one H2 molecule using single-bandgap PEC cells, four photons are generally required for one H2 molecule in the dual-bandgap cells because of an unavoidable charge recombination at the solid-solid interface. Here, triboelectric effects are exploited in the form of triboelectric nanogenerator (TENG) to allow for the generation of one H2 molecule at the expenses of two photons in a dual-bandgap device using an array of core/shell p-type silicon/anatase-TiO2 nanowires as photoelectrode. The TENG, that converts mechanical energy to electricity, efficiently suppresses the charge recombination at the interface and significantly increases the energy of the photo-generated carriers required for the simultaneous water reduction and oxidation. The synergy of photoexcitation and triboelectrics results in a rate of hydrogen production in a neutral Na2SO4 electrolyte around 150 times higher than that of the counterpart, i.e., the device in the absence of TENG. Furthermore, the TENG-induced enhancement in the PEC water splitting remains substantial even when the solar power density is reduced to 20 mW/cm2.

Place, publisher, year, edition, pages
ElsevierElsevier BV, 2022
Keywords
Photoelectrochemical cells, TENG, Water splitting, Nanowires, Hydrogen
National Category
Physical Chemistry Other Physics Topics
Identifiers
urn:nbn:se:uu:diva-458697 (URN)10.1016/j.nanoen.2021.106648 (DOI)000712506700002 ()
Funder
Swedish Research Council, 2019-05484Swedish Energy Agency, 46641-1Olle Engkvists stiftelse, SOEB-2015/167
Note

De två första författarna delar förstaförfattarskapet

Available from: 2021-11-29 Created: 2021-11-29 Last updated: 2024-01-15Bibliographically approved
Majee, S., Zhao, W., Sugunan, A., Gillgren, T., Larsson, J. A., Brooke, R., . . . Ahniyaz, A. (2022). Highly Conductive Films by Rapid Photonic Annealing of Inkjet Printable Starch–Graphene Ink. Advanced Materials Interfaces, 9(5)
Open this publication in new window or tab >>Highly Conductive Films by Rapid Photonic Annealing of Inkjet Printable Starch–Graphene Ink
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2022 (English)In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 9, no 5Article in journal (Refereed) Published
Abstract [en]

A general formulation engineering method is adopted in this study to produce a highly concentrated (≈3 mg mL−1) inkjet printable starch–graphene ink in aqueous media. Photonic annealing of the starch–graphene ink is validated for rapid post-processing of printed films. The experimental results demonstrate the role of starch as dispersing agent for graphene in water and photonic pulse energy in enhancing the electrical properties of the printed graphene patterns, thus leading to an electrical conductivity of ≈2.4 × 104 S m−1. The curing mechanism is discussed based on systematic material studies. The eco-friendly and cost-efficient approach presented in this work is of technical potential for the scalable production and integration of conductive graphene inks for widespread applications in printed and flexible electronics.

Place, publisher, year, edition, pages
John Wiley & SonsWiley, 2022
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-463324 (URN)10.1002/admi.202101884 (DOI)000736432500001 ()
Funder
Swedish Foundation for Strategic Research , FID‐15‐0105BillerudKorsnäs AB
Available from: 2022-01-07 Created: 2022-01-07 Last updated: 2024-01-15Bibliographically approved
Guo, J., Diao, X., Wang, M., Zhang, Z.-B. & Xie, Y. (2022). Self-Driven Electrochromic Window System Cu/WOx-Al3+/GR with Dynamic Optical Modulation and Static Graph Display Functions. ACS Applied Materials and Interfaces, 14(8), 10517-10525
Open this publication in new window or tab >>Self-Driven Electrochromic Window System Cu/WOx-Al3+/GR with Dynamic Optical Modulation and Static Graph Display Functions
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2022 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 14, no 8, p. 10517-10525Article in journal (Refereed) Published
Abstract [en]

Electrochromic devices with unique advantages of electrical/optical bistability are highly desired for energy-saving and information storage applications. Here, we put forward a self-driven AI-ion electrochromic system, which utilizes WOx films, Cu foil, and graphite rod as electrochromic optical modulation and graph display electrodes, coloration potential supplying electrodes, and bleaching potential supplying electrodes, respectively. The inactive Cu electrode can not only realize the effective Al3+ cation intercalation into electrochromic WOx electrodes but also eliminate the problem of metal anode consumption. The electrochromic WOx electrodes cycled in Al3+ aqueous media exhibit a wide potential window (similar to 1.5 V), high coloration efficiency (36.0 cm(2)/C), and super-long-term cycle stability (>2000 cycles). The dynamic optical modulation and static graph display function can be achieved independently only by switching the electrode connection mode, thus bringing more features to this electrochromic system. For a large-area electrochromic system (10 x 10 cm(2)), the absolute transmittance value in its color-neutral state can reach about 41% (27%) at 633 nm (780 nm) by connecting the Cu and WOx electrodes for 140 s. The original transparent state can be readily recovered by replacing the Cu foil with the graphite rod. This work throws light on next-generation electrochromic applications for optical/thermal modulation, privacy protection, and information display.

Place, publisher, year, edition, pages
American Chemical Society (ACS)American Chemical Society (ACS), 2022
Keywords
electrochromic WOx, Al ion, Cu electrode, self-driven system, bifunction
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-473144 (URN)10.1021/acsami.1c22392 (DOI)000778608900051 ()35188734 (PubMedID)
Available from: 2022-04-22 Created: 2022-04-22 Last updated: 2024-01-15Bibliographically approved
Zhao, W., Sugunan, A., Gillgren, T., Larsson, J. A., Zhang, Z.-B., Zhang, S.-L., . . . Ahniyaz, A. (2022). Surfactant-free starch-graphene composite films as simultaneous oxygen and water vapour barriers. npj 2D Materials and Applications, 6, Article ID 20.
Open this publication in new window or tab >>Surfactant-free starch-graphene composite films as simultaneous oxygen and water vapour barriers
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2022 (English)In: npj 2D Materials and Applications, ISSN 2397-7132, Vol. 6, article id 20Article in journal (Refereed) Published
Abstract [en]

A single coating formulation for multi-functional composites, such as a gas barrier against both oxygen and water vapour, is the holy grail for the packaging industry. Since the last decade, graphene has been touted as the ideal barrier material in composites due to its morphology and impermeability to all gases. However, this prospect is limited by either poor dispersion of graphene or excess surfactants to aid the dispersion, both leading to shortcuts that allow gas permeation through the composite. Here, we demonstrate for the first time a combined gas barrier with starch-graphene composite films made from a single formulation of surfactant-free starch nanoparticle-stabilized graphene dispersion (2.97 mg mL-1). Hence, the incorporated graphene reduces the permeability of both the oxygen and the water vapour by over 70% under all the relative humidity conditions tested. Moreover, these films are foldable and electrically conductive (9.5 S m-1). Our surfactant-free approach of incorporating graphene into an industrially important biopolymer is highly relevant to the packaging industry, thus offering cost-effective and water-based solution depositions of multi-functional composite films for wide-ranging applications, such as gas barriers or smart food packaging.

Place, publisher, year, edition, pages
Springer Nature, 2022
Keywords
Graphene, Aqueous graphene dispersions, Noncovalent interactions, Gas barriers
National Category
Materials Chemistry
Research subject
Chemistry with specialization in Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-465002 (URN)10.1038/s41699-022-00292-x (DOI)000770624100001 ()
Funder
Swedish Foundation for Strategic Research , FID-15-0105BillerudKorsnäs AB
Available from: 2022-01-17 Created: 2022-01-17 Last updated: 2022-04-01Bibliographically approved
Chen, L., Wen, C., Zhang, S.-L., Wang, Z. L. & Zhang, Z.-B. (2021). Artificial tactile peripheral nervous system supported by self-power transducers. Nano Energy, 82, Article ID 105680.
Open this publication in new window or tab >>Artificial tactile peripheral nervous system supported by self-power transducers
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2021 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 82, article id 105680Article in journal (Refereed) Published
Abstract [en]

The tactile peripheral nervous system innervating human hands, which is essential for sensitive haptic exploration and dexterous object manipulation, features overlapped receptive fields in the skin, arborization of peripheral neurons and many-to-many synaptic connections. Inspired by the structural features of the natural system, we report a supersensitive artificial slowly adapting tactile afferent nervous system based on the triboelectric nanogenerator technology. Using tribotronic transistors in the design of mechanoreceptors, the artificial afferent nervous system exhibits the typical adapting behaviours of the biological counterpart in response to mechanical stimulations. The artificial afferent nervous system is self-powered in the transduction and event-driven in the operation. Moreover, it has inherent proficiency of neuromorphic signal processing, delivering a minimum resolvable dimension two times smaller than the inter-receptor distance which is the lower limit of the dimension that existing electronic skins can resolve. These results open up a route to scalable neuromorphic skins aiming at the level of human?s exceptional perception for neurorobotic and neuroprosthetic applications.

Place, publisher, year, edition, pages
Elsevier, 2021
National Category
Nano Technology Signal Processing
Identifiers
urn:nbn:se:uu:diva-430396 (URN)10.1016/j.nanoen.2020.105680 (DOI)000634250200001 ()
Available from: 2021-01-09 Created: 2021-01-09 Last updated: 2024-01-15Bibliographically approved
Zhao, W., Sugunan, A., Gillgren, T., Larsson, J. A., Zhang, Z.-B., Zhang, S.-L., . . . Ahniyaz, A. (2021). Surfactant-Free Stabilization of Aqueous Graphene Dispersions Using Starch as a Dispersing Agent. ACS Omega, 6(18), 12050-12062
Open this publication in new window or tab >>Surfactant-Free Stabilization of Aqueous Graphene Dispersions Using Starch as a Dispersing Agent
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2021 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 6, no 18, p. 12050-12062Article in journal (Refereed) Published
Abstract [en]

Attention to graphene dispersions in water with the aid of natural polymers is increasing with improved awareness of sustainability. However, the function of biopolymers that can act as dispersing agents in graphene dispersions is not well understood. In particular, the use of starch to disperse pristine graphene materials deserves further investigation. Here, we report the processing conditions of aqueous graphene dispersions using unmodified starch. We have found that the graphene content of the starch–graphene dispersion is dependent on the starch fraction. The starch–graphene sheets are few-layer graphene with a lateral size of 3.2 μm. Furthermore, topographical images of these starch–graphene sheets confirm the adsorption of starch nanoparticles with a height around 5 nm on the graphene surface. The adsorbed starch nanoparticles are ascribed to extend the storage time of the starch–graphene dispersion up to 1 month compared to spontaneous aggregation in a nonstabilized graphene dispersion without starch. Moreover, the ability to retain water by starch is reduced in the presence of graphene, likely due to environmental changes in the hydroxyl groups responsible for starch–water interactions. These findings demonstrate that starch can disperse graphene with a low oxygen content in water. The aqueous starch–graphene dispersion provides tremendous opportunities for environmental-friendly packaging applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2021
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-446906 (URN)10.1021/acsomega.1c00699 (DOI)000651520800027 ()34056359 (PubMedID)
Funder
Swedish Foundation for Strategic Research , FID-150105BillerudKorsnäs AB
Available from: 2021-06-23 Created: 2021-06-23 Last updated: 2024-01-15Bibliographically approved
Guo, J., Guo, X., Sun, H., Xie, Y., Diao, X., Wang, M., . . . Zhang, Z.-B. (2021). Unprecedented Electrochromic Stability of a-WO3-x Thin Films Achieved by Using a Hybrid-Cationic Electrolyte. ACS Applied Materials and Interfaces, 13(9), 11067-11077
Open this publication in new window or tab >>Unprecedented Electrochromic Stability of a-WO3-x Thin Films Achieved by Using a Hybrid-Cationic Electrolyte
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2021 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 13, no 9, p. 11067-11077Article in journal (Refereed) Published
Abstract [en]

With large interstitial space volumes and fast ion diffusion pathways, amorphous metal oxides as cathodic intercalation materials for electrochromic devices have attracted attention. However, these incompact thin films normally suffer from two inevitable imperfections: self-deintercalation of guest ions and poor stability of the structure, which constitute a big obstacle toward the development of high-stable commercial applications. Here, we present a low-cost, eco-friendly hybrid cation 1,2-PG-AlCl3 center dot 6H(2)O electrolyte, in which the sputter-deposited a-WO3-x thin film can exhibit both the long-desired excellent open-circuit memory (>100 h, with zero optical loss) and super-long cycling lifetime (similar to 20,000 cycles, with 80% optical modulation), benefiting from the formation of unique Al-hydroxide-based solid electrolyte interphase during electrochromic operations. In addition, the optical absorption behaviors in a-WO3-x caused by host-guest interactions were elaborated. We demonstrated that the intervalence transfers are primarily via the "corner-sharing" related path (W5+ <-> W6+) but not the "edge-sharing" related paths (W4+ <-> W6+ and/or W4+ <-> W5+), and the small polaron/electron transfers taking place at the W-O bond-breaking positions are not allowed. Our findings might provide in-depth insights into the nature of electrochromism and provide a significant step in the realization of more stable, more excellent electrochromic applications based on amorphous metal oxides.

Place, publisher, year, edition, pages
American Chemical Society (ACS)AMER CHEMICAL SOC, 2021
Keywords
a-WO3-x thin film, 1, 2-PG-AlCl3 center dot 6H(2)O electrolyte, open-circuit memory, cyclic stability, optical absorption
National Category
Materials Chemistry Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-441178 (URN)10.1021/acsami.0c22921 (DOI)000629054100038 ()33645966 (PubMedID)
Available from: 2021-05-04 Created: 2021-05-04 Last updated: 2024-01-15Bibliographically approved
Fu, Y., Hansson, J., Liu, Y., Chen, S., Zehri, A., Samani, M. K., . . . Liu, J. (2020). Graphene related materials for thermal management. 2D Materials, 7(1), Article ID 012001.
Open this publication in new window or tab >>Graphene related materials for thermal management
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2020 (English)In: 2D Materials, E-ISSN 2053-1583, Vol. 7, no 1, article id 012001Article, review/survey (Refereed) Published
Abstract [en]

Almost 15 years have gone ever since the discovery of graphene as a single atom layer. Numerous papers have been published to demonstrate its high electron mobility, excellent thermal and mechanical as well as optical properties. We have recently seen more and more applications towards using graphene in commercial products. This paper is an attempt to review and summarize the current status of the research of the thermal properties of graphene and other 2D based materials including the manufacturing and characterization techniques and their applications, especially in electronics and power modules. It is obvious from the review that graphene has penetrated the market and gets more and more applications in commercial electronics thermal management context. In the paper, we also made a critical analysis of how mature the manufacturing processes are; what are the accuracies and challenges with the various characterization techniques and what are the remaining questions and issues left before we see further more applications in this exciting and fascinating field.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD, 2020
Keywords
graphene, 2D materials, thermal management, material fabrication, thermal characterization
National Category
Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-402959 (URN)10.1088/2053-1583/ab48d9 (DOI)000504292500001 ()
Funder
Swedish Research Council, 621-2007-4660Swedish Foundation for Strategic Research, SE13-0061Vinnova
Available from: 2020-01-22 Created: 2020-01-22 Last updated: 2023-01-09Bibliographically approved
Pham, N. H., Vallin, Ö., Panda, J., Kamalakar, M. V., Guo, J., Luo, J., . . . Zhang, Z.-B. (2020). High thermoelectric power factor of p-type amorphous silicon thin films dispersed with ultrafine silicon nanocrystals. Journal of Applied Physics, 127(24), Article ID 245304.
Open this publication in new window or tab >>High thermoelectric power factor of p-type amorphous silicon thin films dispersed with ultrafine silicon nanocrystals
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2020 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 127, no 24, article id 245304Article in journal (Refereed) Published
Abstract [en]

Silicon, a candidate as an abundant-element thermoelectric material for low-temperature thermal energy scavenging applications, generally suffers from rather low thermoelectric efficiency. One viable solution to enhancing the efficiency is to boost the power factor (PF) of amorphous silicon (a-Si) while keeping the thermal conductivity sufficiently low. In this work, we report that PF >1 m Wm−1 K−2 is achievable for boron-implanted p-type a-Si films dispersed with ultrafine crystals realized by annealing with temperatures ≤600 °C. Annealing at 550 °C initiates crystallization with sub-5-nm nanocrystals embedded in the a-Si matrix. The resultant thin films remain highly resistive and thus yield a low PF. Annealing at 600 °C approximately doubles the density of the sub-5-nm nanocrystals with a bimodal size distribution characteristic and accordingly reduces the fraction of the amorphous phase in the films. Consequently, a dramatically enhanced electrical conductivity up to 104 S/m and hence PF > 1 m Wm−1 K−2 measured at room temperature are achieved. The results show the great potential of silicon in large-scale thermoelectric applications and establish a route toward high-performance energy harvesting and cooling based on silicon thermoelectrics.

National Category
Condensed Matter Physics Other Materials Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:uu:diva-420099 (URN)10.1063/5.0004318 (DOI)000545781200001 ()
Funder
Swedish Research Council, 621-2014-5596Swedish Research Council, 2016-03278
Available from: 2020-09-25 Created: 2020-09-25 Last updated: 2020-10-26Bibliographically approved
Projects
Phononic Thin-Film Thermoelectric Generators - HotTEG [2014-05596_VR]; Uppsala UniversitySelf-Assisted Electric Field-Effect Thermoelectric Generators ̶ SELFTEG [2019-05484_VR]; Uppsala University
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0244-8565

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