Boosting catalytic performance of hierarchical Co/Co0.85Se microspheres via Mott-Schottky effect toward triiodide reduction and alkaline hydrogen evolution

被引：0

作者：

Song, Tianshu ^{[1
]}

Zhang, Zhuanfan ^{[2
]}

Zhao, Bing ^{[1
]}

Wang, Liyan ^{[1
]}

Kan, Wei ^{[1
]}

Sun, Li ^{[1
]}

Wang, Xiuwen ^{[1
]}

机构：

[1] Heilongjiang Provincial Key Laboratory of Surface Active Agent and Auxiliary, College of Chemistry and Chemistry Engineering, Qiqihar University, Qiqihar,161006, China

[2] Center of Teaching Experiment Management Equipment, Qiqihar University, Qiqihar,161006, China

来源：

Journal of Alloys and Compounds | 2022年 / 918卷

基金：

中国国家自然科学基金;

关键词：

Catalyst activity - Cost effectiveness - Energy conversion - Heterojunctions - Microspheres - Photoelectricity - Potassium hydroxide - Selenium compounds - Transition metals;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Interface engineered composites composing of metal and transition metal selenides have been deemed as promising substitutes as noble Pt in the fields of the energy conversion. Herein, the well-defined hierarchical Co/Co0.85Se microsphere with Mott-Schottky (M-S) effect was synthesized by the facile solvothermal method (Co/Co0.85Se-3). Interestingly, the as-obtained 3D Co0.85Se microsphere was assembled by 2D porous nanosheets. The characteristics including M-S heterojunction and hierarchical structure endows Co/Co0.85Se microsphere with high specific surface area, good conductivity, and synergistic effect between metal Co and Co0.85Se. More concretely, the optimized Co/Co0.85Se exhibits outstanding catalytic activity toward triiodide reduction reaction (IRR). When employed as the counter electrode (CE) catalyst for dye-sensitized solar cell (DSSC), a photoelectric conversion efficiency (PCE) of 8.31 % is achieved, which is 3.36 % higher than that of Pt-control device (8.04 %). Moreover, Co/Co0.85Se-3 displays remarkable catalytic activity for hydrogen evolution reaction (HER) with a low overpotential of 107 mV at the current density of 10 mA cm−2 under alkaline condition (1.0 M KOH), accompanying with Tafel slope of 140 mV dec−1. Our discovery provides an effective approach to develop the cost-effective advanced catalysts to promote the application of DSSC and HER. © 2022 Elsevier B.V.

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