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Mechanistic Insights into the Coloration, Evolution, and Degradation of NiOx Electrochromic Anodes
Beihang Univ, Sch Phys & Nucl Energy Engn, Electrochr Ctr, Beijing 100191, Peoples R China.
Beihang Univ, Sch Phys & Nucl Energy Engn, Electrochr Ctr, Beijing 100191, Peoples R China.
Beihang Univ, Sch Phys & Nucl Energy Engn, Electrochr Ctr, Beijing 100191, Peoples R China.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.ORCID iD: 0000-0003-0244-8565
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2018 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 57, no 15, p. 8874-8880Article in journal (Refereed) Published
Abstract [en]

NiOx is recognized as the leading candidate for smart window anodes that can dynamically modulate optical absorption, thereby achieving energy efficiency in construction buildings. However, the electrochromic mechanism in NiOx is not yet clear, and the ionic species involved are sometimes ambiguous, particularly in aprotic electrolytes. We demonstrate herein that the "net coloration effect" originates from newly generated high-valence Ni3+/Ni4+ ions during anion-dependent anodization, and the Li+ intercalation/deintercalation only plays a role in modulating the oxidation state of Ni. Unambiguous evidences proving the occurrence of anodization reaction were obtained by both chronoamperometry and cyclic voltammetry. Benefiting from the irreversible polarization of Ni2+ to Ni3+/Ni4+, the quantity of voltammetric charge increases by similar to 38% under the same test conditions, enhancing the corresponding electrochromic modulation by similar to 8%. Strong linkages between the coloration, evolution, and degradation observed in this work provide in-depth insights into the electrocatalytic and electrochromic mechanisms.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 57, no 15, p. 8874-8880
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Inorganic Chemistry Engineering and Technology
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URN: urn:nbn:se:uu:diva-365828DOI: 10.1021/acs.inorgchem.8b00793ISI: 000441477100025PubMedID: 30047734OAI: oai:DiVA.org:uu-365828DiVA, id: diva2:1265721
Available from: 2018-11-26 Created: 2018-11-26 Last updated: 2018-11-26Bibliographically approved

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Zhang, Zhi-Bin

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