2017年8月
Electrocatalytic water oxidation at low energy cost by a highly active and robust calcium-manganese oxide thin film sintered on an FTO electrode with ethyl methyl imidazolium triflate ionic liquid
JOURNAL OF MATERIALS CHEMISTRY A
- ,
- ,
- 巻
- 5
- 号
- 29
- 開始ページ
- 15167
- 終了ページ
- 15174
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1039/c7ta03665e
- 出版者・発行元
- ROYAL SOC CHEMISTRY
We report a simple and novel method involving an ethyl methyl imidazolium triflate ionic liquid (EMI OTf) to prepare highly mechanically stable crystalline alpha-Mn2O3 and calcium-incorporated manganese oxide (CaMn-oxide) thin film water oxidation electrocatalysts (WOCs) on a fluorine-doped tin oxide (FTO) electrode (FTO/EMI alpha-Mn2O3 and FTO/EMI CaMn-oxide). Electrochemical measurements showed that the incorporation of calcium into manganese oxide promotes water oxidation at a very low energy cost, similar to that observed in natural photosystem II (PSII). The low energy cost is due to the involvement of the Mn-IV=O species in the catalysis as compared to the Mn-V=O species that has been previously detected in calcium-free alpha-Mn2O3. Moreover, the FTO/EMI CaMn-oxide electro-catalyst showed unprecedentedly high activity (TOF approximate to 29.8 s(-1) at eta = 0.57 V) and robustness (tested for 40 h) for water oxidation in a neutral potassium phosphate (KPi) buffer solution (0.1 M, pH 7.0). The mechanism of water oxidation by FTO/EMI CaMn-oxide was discussed and applied for water oxidation by the mu-oxido-CaMn4O5 cluster of photosystem II (PS II).
- リンク情報
- ID情報
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- DOI : 10.1039/c7ta03665e
- ISSN : 2050-7488
- eISSN : 2050-7496
- Web of Science ID : WOS:000406187800025