Mechanistic Insights into the Coloration, Evolution, and Degradation of NiOx Electrochromic Anodes
| Autor: | Jiang Liu, Yu Xiao, Qirong Liu, Mei Wang, Hang Yu, Qianqian Zhang, Xungang Diao, Junji Guo, Zhibin Zhang, Guobo Dong |
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| Rok vydání: | 2018 |
| Předmět: |
Chemistry
020209 energy Intercalation (chemistry) Ionic bonding 02 engineering and technology Electrolyte Chronoamperometry 021001 nanoscience & nanotechnology Photochemistry Inorganic Chemistry Electrochromism Oxidation state 0202 electrical engineering electronic engineering information engineering Physical and Theoretical Chemistry Cyclic voltammetry 0210 nano-technology Polarization (electrochemistry) |
| Zdroj: | Inorganic Chemistry. 57:8874-8880 |
| ISSN: | 1520-510X 0020-1669 |
| Popis: | 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 ∼38% under the same test conditions, enhancing the corresponding electrochromic modulation by ∼8%. Strong linkages between the coloration, evolution, and degradation observed in ... |
| Databáze: | OpenAIRE |
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