Qiu Hua-Jun, Du Peng, Hu Kailong, Gao Jiaojiao, Li Huanglong, Liu Pan, Ina Toshiaki, Ohara Koji, Ito Yoshikazu, Chen Mingwei
School of Materials Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, 305-8573, Japan.
Adv Mater. 2019 May;31(19):e1900843. doi: 10.1002/adma.201900843. Epub 2019 Mar 28.
Developing bifunctional electrocatalysts with high activities and long durability for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial toward the practical implementation of rechargeable metal-air batteries. Here, a 3D nanoporous graphene (np-graphene) doped with both N and Ni single atoms/clusters is reported. The predoping of N by chemical vapor deposition (CVD) dramatically increases the Ni doping amount and stability. The resulting N and Ni codoped np-graphene has excellent electrocatalytic activities for both the ORR and the OER in alkaline aqueous solutions. The synergetic effects of N and Ni dopants are revealed by density functional theory calculations. The free-standing Ni,N codoped 3D np-graphene shows great potential as an economical catalyst/electrode for metal-air batteries.
开发具有高活性和长耐久性的双功能电催化剂用于氧还原反应（ORR）和析氧反应（OER）对于可充电金属空气电池的实际应用至关重要。在此，报道了一种同时掺杂N和Ni单原子/团簇的3D纳米多孔石墨烯（np-石墨烯）。通过化学气相沉积（CVD）对N进行预掺杂显著增加了Ni的掺杂量和稳定性。所得的N和Ni共掺杂np-石墨烯在碱性水溶液中对ORR和OER均具有优异的电催化活性。密度泛函理论计算揭示了N和Ni掺杂剂的协同效应。独立的Ni、N共掺杂3D np-石墨烯作为金属空气电池的经济催化剂/电极具有巨大潜力。
