Cao Lei, Wang Yu, Zhu Qian, Fan Lanlan, Wu Yu, Li Zhenhuan, Xiong Shixian, Gu Feng
Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems, International Institute for Innovation, Jiangxi University of Science and Technology, Nanchang 330013, China.
State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China.
ACS Appl Mater Interfaces. 2022 Apr 20;14(15):17249-17258. doi: 10.1021/acsami.2c00163. Epub 2022 Apr 11.
Developing high-performance non-noble metal bifunctional oxygen reduction and evolution reaction electrocatalysts is a critical factor for the commercialization of rechargeable Zn-air batteries. Herein, Co/Co-N/Co-O rooted on reduced graphene oxide (rGO) hybrid boron and nitrogen codoped carbon (BCN) nanotube arrays (BCN/rGO-Co) is prepared by facile low-temperature precross-linking and high-temperature pyrolysis treatment. Benefit from the synergistic effect of its B/N codoping, Co/Co-N/Co-O bifunctional active sites, 3D hybrid porous structure of BCN nanotubes, and highly conductive rGO sheets. The obtained BCN/rGO-Co exhibits superior bifunctional oxygen catalytic activity with a positive ORR half-wave potential (0.85 V) and a low OER potential (1.61 V) at 10 mA cm. Additionally, the BCN/rGO-Co-based liquid Zn-air batteries displays a large peak power density of 157 mW cm, and a long charge/discharge cycle stability of 200 h, outdoing the commercial Pt/C+Ru/C catalyst.
开发高性能非贵金属双功能氧还原和析氧反应电催化剂是可充电锌空气电池商业化的关键因素。在此，通过简便的低温预交联和高温热解处理制备了基于还原氧化石墨烯（rGO）杂化硼和氮共掺杂碳（BCN）纳米管阵列（BCN/rGO-Co）的Co/Co-N/Co-O。受益于其B/N共掺杂、Co/Co-N/Co-O双功能活性位点、BCN纳米管的三维杂化多孔结构以及高导电性rGO片层的协同效应。所制备的BCN/rGO-Co在10 mA cm时表现出优异的双功能氧催化活性，具有正的ORR半波电位（0.85 V）和低的OER电位（1.61 V）。此外，基于BCN/rGO-Co的液态锌空气电池显示出157 mW cm的大峰值功率密度以及200 h的长充放电循环稳定性，优于商业Pt/C+Ru/C催化剂。
