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3D Nitrogen-Doped Graphene Encapsulated Metallic Nickel–Iron Alloy Nanoparticles for Efficient Bifunctional Oxygen Electrocatalysis |
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| Authors: | Zhaoyang Wang Xiaobin Liao Zifeng Lin Prof Fuzhi Huang Yalong Jiang Kwadwo Asare Owusu Prof Lin Xu Ziang Liu Dr Jiantao Li Prof Yan Zhao Prof Yi-Bing Cheng Prof Liqiang Mai |
| Institution: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070 P. R. China
These authors contributes equally to this work.;2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070 P. R. China;3. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070 P. R. China ARC Centre of Excellence in Exciton Science, Monash University, Clayton, Victoria, 3800 Australia |
| Abstract: | It is extremely desirable to explore high-efficient, affordable and robust oxygen electrocatalysts toward rechargeable Zn–air batteries (ZABs). A 3D porous nitrogen-doped graphene encapsulated metallic Ni3Fe alloy nanoparticles aerogel (Ni3Fe-GA1) was constructed through a facile hydrothermal assembly and calcination process. Benefiting from 3D porous configuration with great accessibility, high electrical conductivity, abundant active sites, optimal nitrogen content and strong electronic interactions at the Ni3Fe/N-doped graphene heterointerface, the obtained aerogel showed outstanding catalytic performance toward the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Specifically, it exhibited an overpotential of 239 mV to attain 10 mA cm?2 for OER, simultaneously providing a positive onset potential of 0.93 V within a half-wave potential of 0.8 V for ORR. Accordingly, when employed in the aqueous ZABs, Ni3Fe-GA1 achieved higher power density and superior reversibility than Pt/C?IrO2 catalyst, making it a potential candidate for rechargeable ZABs. |
| Keywords: | 3D nitrogen-doped graphene aerogel bifunctional electrocatalyst interface engineering nanoparticles Zn–air batteries |