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Co and Fe Codoped WO2.72 as Alkaline-Solution-Available Oxygen Evolution Reaction Catalyst to Construct Photovoltaic Water Splitting System with Solar-To-Hydrogen Efficiency of 16.9%
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| Title: | Co and Fe Codoped WO2.72 as Alkaline-Solution-Available Oxygen Evolution Reaction Catalyst to Construct Photovoltaic Water Splitting System with Solar-To-Hydrogen Efficiency of 16.9% |
| Authors: | Chen, Huayu Browse this author | | Song, Lizhu Browse this author | | Ouyang, Shuxin Browse this author | | Wang, Jianbo Browse this author | | Lv, Jun Browse this author | | Ye, Jinhua Browse this author →KAKEN DB |
| Keywords: | codoping | | electrocatalysis | | oxygen evolution reaction | | photovoltaic water splitting | | WO2.72 |
| Issue Date: | 21-Aug-2019 |
| Publisher: | John Wiley & Sons |
| Journal Title: | Advanced science |
| Volume: | 6 |
| Issue: | 16 |
| Start Page: | 1900465 |
| Publisher DOI: | 10.1002/advs.201900465 |
| Abstract: | Oxygen evolution electrode is a crucial component of efficient photovoltaic-water electrolysis systems. Previous work focuses mainly on the effect of electronic structure modulation on the oxygen evolution reaction (OER) performance of 3d-transition-metal-based electrocatalyst. However, high-atomic-number W-based compound with complex electronic structure for versatile modulation is seldom explored because of its instability in OER-favorable alkaline solution. Here, codoping induced electronic structure modulation generates a beneficial effect of transforming the alkaline-labile WO2.72 (WO) in to efficient alkaline-solution-stable Co and Fe codoped WO2.72 (Co&Fe-WO) with porous urchin-like structure. The codoping lowers the chemical valence of W to ensure the durability of W-based catalyst, improves the electron-withdrawing capability of W and O to stabilize the Co and Fe in OER-favorable high valence state, and enriches the surface hydroxyls, which act as reactive sites. The Co&Fe-WO shows ultralow overpotential (226 mV, J = 10 mA cm(-2)), low Tafel slope (33.7 mV dec(-1)), and good conductivity. This catalyst is finally applied to a photovoltaic-water splitting system to stably produce hydrogen for 50 h at a high solar-to-hydrogen efficiency of 16.9%. This work highlights the impressive effect of electronic structure modulation on W-based catalyst, and may inspire the modification of potential but unstable catalyst for solar energy conversion. |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/75277 |
| Appears in Collections: | 総合化学院 (Graduate School of Chemical Sciences and Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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