Kangdi Lin, Meijie Chen, Zihao Zhou, Hongyun Huang, Jinlian Zhang, Shaomin Peng, Ming Sun and Lin Yu*,
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引用次数: 0
Abstract
The development of highly effective bifunctional electrocatalysts for the oxygen reduction (ORR) and evolution reactions (OERs) is pivotal for the advancement of rechargeable zinc–air batteries (ZABs) with superior electrochemical performance. This study presents a facile strategy for the synthesis of a biomass-derived nitrogen-doped carbon-coated FeCo catalyst. By optimizing the calcination temperature, the FeCo@NC-900, synthesized at 900 °C, demonstrates superior ORR/OER performance, with a half-wave potential of 0.81 V for ORR and an overpotential of 349 mV to drive a current density of 10 mA cm–2 for OER. Electrochemical testing of ZABs employing FeCo@NC-900 as electrode catalysts reveals excellent performance, with a peak power density of 103.6 mW cm–2 at 160 mA cm–2 and sustains operation for over 300 h at a current density of 5 mA cm–2 with superior cycling stability. These results surpass those of the Pt/C-RuO2-based counterpart. Given its low cost and straightforward preparation, FeCo@NC-900 emerges as a highly promising catalyst for energy storage and conversion applications.
开发高效的氧还原反应(ORR)和氧还原反应(OERs)双功能电催化剂是研制具有优异电化学性能的可充电锌空气电池(ZABs)的关键。本研究提出了一种合成生物质衍生的氮掺杂碳包覆FeCo催化剂的简便策略。通过优化煅烧温度,在900℃下合成的FeCo@NC-900具有优异的ORR/OER性能,ORR的半波电位为0.81 V,过电位为349 mV, OER的电流密度为10 mA cm-2。采用FeCo@NC-900作为电极催化剂的ZABs的电化学测试结果表明,在160 mA cm-2电流下,ZABs的峰值功率密度为103.6 mW cm-2,在5 mA cm-2电流密度下,ZABs的运行时间超过300 h,具有优异的循环稳定性。这些结果超过了基于Pt/ c - ruo2的对应物。由于其低成本和简单的制备,FeCo@NC-900成为储能和转换应用中非常有前途的催化剂。
期刊介绍:
ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.