Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 918, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.165608
Keywords
Dye-sensitized solar cell; Hydrogen evolution reaction; Bifunctional catalysts; Heterostructure; Hierarchical structure
Categories
Funding
- National Natural Science Foundation of China [21978140, 22005161]
- Natural Science Foundation of Heilongjiang Province [GZ20210064]
- Fundamental Research Funds in Heilongjiang Provincial Universities of China [145109101]
- Heilongjiang Provincial Key Laboratory of Surface Active Agent and Auxiliary [BMHXJKF 006]
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In this study, hierarchical Co/Co0.85Se microspheres with Mott-Schottky effect were synthesized by a facile solvothermal method. The microspheres exhibited high specific surface area, good conductivity, and a synergistic effect between metal Co and Co0.85Se. The optimized Co/Co0.85Se showed outstanding catalytic activity for triiodide reduction reaction and hydrogen evolution reaction, making it a promising catalyst for dye-sensitized solar cells and hydrogen production.
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.
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