期刊
CHEMICAL ENGINEERING JOURNAL
卷 442, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136128
关键词
Cu NDs/Fe2O3 Mott-Schottky heterojunction; N-rich porous carbon nanosheets; Bifunctional oxygen electrocatalysis; Rechargeable Zn-air batteries
资金
- Key Technology Research and Development Program of Shandong Province of China [2019GGX103029]
- Natural Science Foundation of Shandong Prov-ince of China [ZR2020MB024]
- Open Project Program of Guangdong Provincial Key Laboratory for Electronic Functional Mate-rials and Devices, Huizhou University [EFMD2021001Z]
The study developed a Mott-Schottky electrocatalyst Cu NDs/Fe2O3-NPCs to enhance electron transfer and catalytic activities for ORR and OER in ZABs. The porous structure of the catalyst contributed to improved mass transfer efficiency, leading to excellent electrocatalytic performance.
The fast electron transfer is a prerequisite to develop the high-performance bifunctional electrocatalysts for rechargeable Zn-air batteries (ZABs). In this work, the Mott-Schottky electrocatalyst Cu NDs/Fe2O3-NPCs was developed by creating Cu nanodots (NDs)/Fe2O3 heterojunction nanoislands rooted on N-rich porous carbon nanosheets (NPCs). The formed Mott-Schottky heterojunction Cu NDs/Fe2O3 nanoislands promoted the electron transfer from the metallic Cu to the semiconductive Fe2O3 phase, as a result, the adsorptions towards O-2 and OH species were improved, and sequentially the catalytic activities for both oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) were both remarkably enhanced. In addition, the porous nature of the developed catalyst also contributed to the effectiveness of the required mass transfer. The optimal Mott-Schottky Cu NDs/Fe2O3-NPCs catalyst exhibited an onset potential of 0.98 V and a Tafel slop of 53.7 mV dec(-1) for ORR, and an overpotential of 328 mV at 10 mA cm(-2) for OER. Further, the ZAB assembled with Cu NDs/Fe2O3-NPCs catalyst displayed a high power density of 138 mW cm(-2) and an excellent long-term cyclability.
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