期刊
ELECTROCHIMICA ACTA
卷 307, 期 -, 页码 403-413出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.03.192
关键词
FeNi3Cx-Pd-y series; Bifunctional electrocatalysts; Oxygen evolution reaction; Oxygen reduction reaction; Rechargeable zinc-air batteries
资金
- National Natural Science Foundation of China [51676049]
- Science and Technology Program of Guangdong Province [2017A050506014]
- Guangzhou Science and Technology Plan Projects [201804010323]
- Guangdong Natural Science Funds for Distinguished Young Scholars [2015A030306006]
- Guangdong Innovative and Entrepreneurial Research Team Program [2014ZT05N200]
- Fundamental Research Funds for the Central Universities (SCUT) [2018ZD022]
The development of durable and high-efficiency bifunctional electrocatalysts for both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is critical to boost the performance of rechargeable zinc-air batteries (RZABs). Herein, we report a general approach for fabricating FeNi3Cx-Pd-y (x represents the indeterminate amount of carbon, y denotes the initial Pd mass loading percentage) nanorods using bimetallic metal-organic frameworks (MOFs) as sacrificial precursor. Among the series, FeNi3Cx-Pd-7% demonstrates the best performance as bifunctional oxygen catalyst. It exhibits a high electrocatalytic activity with an unexpectedly low overpotential of 288 mV for OER at 50 mA cm(-2), which is far superior than the state-of-art RuO(2 )catalyst, and its performance for ORR also approximates to the benchmark Pt/C catalyst. When incorporated as air-cathode catalyst in a self-assembled RZAB, FeNi3Cx-Pd-7% exhibits a high power density of 234 mW cm(-2), a large energy density of similar to 967 W h kg(-1), as well as a huge specific capacity of 772 mA h g(-1) outperforming the noble-metal-based Pt/C + RuO2 catalyst. Additionally, FeNi3Cx-Pd-7% enables RZAB to obtain a long cycling life (over 900 cycles) with high efficiency and an overall overpotential of only 720 mV at 10 mA cm(-2), presenting great potential for the commercial applications of RZABs. (C) 2019 Elsevier Ltd. All rights reserved.
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