根据双 MOFs 战略开发的用于高性能锌-空气电池的双功能空气电极

EES catalysis Pub Date : 2024-04-19 DOI:10.1039/D4EY00008K
Yasir Arafat, Muhammad Rizwan Azhar, Yijun Zhong, Xiaomin Xu, Moses O. Tadé and Zongping Shao
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引用次数: 0

摘要

氧气还原/进化反应(ORR/OER)的耐用、高性能和高性价比双功能催化剂是锌空气电池(ZAB)实际应用的关键。在此,我们报告了一种结合原始和碳化 MOF 开发 ZAB 双功能电催化剂的新概念,其中原始 MOF 可作为氧还原/氧化还原反应催化剂的载体,而碳化 MOF 可作为 ORR 催化剂并提供电子导电性。通过在含铁的三维 MOF(MIL-100)表面进行无电解镀镍,催化剂显示出卓越的 OER 活性,在过电位为 295 mV 时,电流密度为 10 mA cm-2,塔菲尔斜率低至 62 mV dec-1。三维多孔 MOF 可作为生长具有最大暴露活性位点的 NiP 的基底,MOF 中的铁与 NiP 相互作用,进一步提高了 OER 的内在活性。我们在 NiP-MIL-100 中引入了碳化 ZIF-67 (C-ZIF-67),从而构建了一种双功能催化剂,其中 C-ZIF-67 不仅能提供 ORR 催化活性,还能与 NiP-MIL-100 产生协同效应,加速电荷/质量转移。作为 ZIB 的空气电极,C-ZIF-67 实现了极佳的双功能性,具有较小的电位差(0.78 V)、较高的峰值功率密度(203 mW cm-2)和 500 小时的稳定循环。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A bi-functional air electrode developed from a dual-MOF strategy for high-performance zinc–air batteries†

A bi-functional air electrode developed from a dual-MOF strategy for high-performance zinc–air batteries†

A durable, high-performing and cost-effective bi-functional catalyst toward oxygen reduction/evolution reactions (ORR/OER) is the key towards the practical application of Zn–air batteries (ZABs). Here, we report a new concept of combining pristine and carbonized MOFs for developing a bifunctional electrocatalyst for ZABs, where the pristine MOF acts as a support for the OER catalysts and the carbonized MOF acts as the ORR catalyst and enhances the electronic conductivity. By electroless NiP-plating over the surface of the Fe-containing 3D MOF (MIL-100), the catalyst shows superior activity for the OER, delivering a current density of 10 mA cm−2 at an overpotential of 295 mV together with a low Tafel slope of 62 mV dec−1. A 3D porous MOF serves as a substrate for growing NiP with maximal exposed active sites and the iron in the MOF interacts with NiP to further boost the intrinsic OER activity. Subsequently, we introduce carbonized ZIF-67 (C-ZIF-67) into NiP-MIL-100 to build a bifunctional catalyst, where C-ZIF-67 not only provides ORR catalytic activity but also creates a synergetic effect with NiP-MIL-100, and to expedite the charge/mass transfer. Using this air electrode for ZABs, an excellent bifunctionality with a small potential gap (0.78 V), a high peak power density (203 mW cm−2) and robust cycling over a period of 500 h were achieved.

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