Gao Liang, Chang Shengming, Zhang Zhongyi
College of Chemistry and Chemical Engineering, Qingdao University, Qingdao 266071, P. R. China.
ACS Appl Mater Interfaces. 2021 May 19;13(19):22282-22291. doi: 10.1021/acsami.1c00484. Epub 2021 May 10.
A novel composite catalyst (CoFeP@C) was constructed by high-quality CoFeP nanoparticles embedded in a N, P dual-doped carbon matrix. These CoFeP nanoparticles are rich in active sites of the oxygen evolution reaction (OER) at surfaces and provide metallic conductivity in their bulk phases. The N, P dual-doped carbon matrix provided abundant active sites of the oxygen reduction reaction (ORR) and formed a conductive network substrate. The ideal composite structure endowed CoFeP@C with highly efficient bifunctional performance for catalyzing both OER and ORR, accordingly making CoFeP@C an ideal catalyst for rechargeable Zn-air batteries. The liquid Zn-air battery of CoFeP@C has achieved a large power density of 143.5 mW/cm and can be charged and discharged stably for 200 h (1200 cycles). The solid-state Zn-air battery of CoFeP@C has achieved a power density of 72.6 mW/cm and can stably run for 20 h. This work has deepened the understanding of synergistic catalysis and paved one way for the development of high-performance bifunctional catalysts.
通过将高质量的CoFeP纳米颗粒嵌入N、P双掺杂碳基质中构建了一种新型复合催化剂（CoFeP@C）。这些CoFeP纳米颗粒在表面富含析氧反应（OER）的活性位点，并在其体相中提供金属导电性。N、P双掺杂碳基质提供了丰富的氧还原反应（ORR）活性位点，并形成了导电网络基底。理想的复合结构赋予CoFeP@C高效的双功能性能，可同时催化OER和ORR，因此使CoFeP@C成为可充电锌空气电池的理想催化剂。CoFeP@C的液态锌空气电池实现了143.5 mW/cm的大功率密度，可稳定充放电200小时（1200次循环）。CoFeP@C的固态锌空气电池实现了72.6 mW/cm的功率密度，可稳定运行20小时。这项工作加深了对协同催化的理解，为高性能双功能催化剂的开发铺平了道路。
