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Rational Design of 2D Manganese Phosphate Hydrate Nanosheets as Pseudocapacitive Electrodes
CSIR, Energy Ctr, ZA-0001 Pretoria, South Africa.
Pacific Northwest Natl Lab, Energy & Environm Directorate, Richland, WA 99352 USA.
King Abdullah Univ Sci & Technol, Divis Phys Sci & Engn, Thuwal 239556900, Saudi Arabia.
King Abdullah Univ Sci & Technol, Divis Phys Sci & Engn, Thuwal 239556900, Saudi Arabia.
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2020 (English)In: ACS ENERGY LETTERS, ISSN 2380-8195, Vol. 5, no 1, p. 23-30Article in journal (Refereed) Published
Abstract [en]

A new class of 2D nanosheets of nitrogen-integrated phosphate-rich ammonium manganese phosphate hydrate, (NH4MnPO4 center dot H2O) (AMP), has been developed as pseudocapacitive electrode materials. The optimized electrodes exhibited device capacitances of 48.4 and 65.4 F/g for symmetric and asymmetric configurations, respectively. The devices showed excellent energy and power (e.g., 29.4 Wh/kg and 133 kW/kg for asymmetric cells) with extraordinary capacitance retention (e.g., >93%, 100 000 cycles at 5 A/g for asymmetric cells) that surpass those of most of the reported values. The huge pseudocapacitance of AMP is attributed to several factors, including the electroactive sites containing NH4+ ions, the conductive inorganic layers, intercalated water interactions of Mn2+center dot center dot center dot H2O, redox-active phosphate ions, and the 2D nanosheets. AMP-based all-solid-state flexible asymmetric devices exhibited >95% capacitance retention upon 1000 repetitive charge-discharge cycles. This study opens doors to elegant strategies of unlocking the rich physicoelectrochemical properties of 2D AMP for next-generation pseudocapacitors.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2020. Vol. 5, no 1, p. 23-30
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-405348DOI: 10.1021/acsenergylett.9b02299ISI: 000507145900004OAI: oai:DiVA.org:uu-405348DiVA, id: diva2:1404737
Available from: 2020-02-28 Created: 2020-02-28 Last updated: 2020-02-28Bibliographically approved

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