双功能
析氧
电催化剂
材料科学
纳米颗粒
催化作用
石墨烯
电池(电)
合金
化学工程
双功能催化剂
锌
贵金属
纳米技术
金属
无机化学
化学
电极
电化学
冶金
物理化学
有机化学
功率(物理)
量子力学
物理
工程类
作者
Zhiwen Xu,Guangyu Chen,Fei Yang,Juhee Jang,Guimei Liu,Fei Xiao,Yan Sun,Xiaoyi Qiu,Weiwei Chen,Dong Su,Meng Gu,Minhua Shao
标识
DOI:10.1016/j.electacta.2023.142549
摘要
The development of inexpensive and high-performance bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of crucial significance for rechargeable metal-air batteries, but remains challenging. Herein, we report an ingenious bifunctional oxygen electrocatalyst integrating ZIF-derived carbon-anchored Fe/Ni single atoms, FeNi alloy nanoparticles, and graphene support (denoted as Fe/Ni-NC||[email protected]). Synergizing highly active Fe single atoms for the ORR and highly efficient FeNi alloy nanoparticles for the OER, the as-constructed Fe/Ni-NC||[email protected] catalyst exhibits outstanding bifunctionality; the potential gap between the OER potential at 10 mA cm–2 and the ORR half-wave potential is only 0.618 V, outperforming the benchmark Pt/C + Ir/C catalyst and most transition metal-based bifunctional catalysts reported in the literature. More importantly, the Fe/Ni-NC||[email protected] zinc-air battery (ZAB) delivers a maximum power density of ∼200 mW cm–2, a specific capacity of 876 mAh g–1, and excellent cycling stability with negligible voltage decay up to 500 hours (3000 cycles). This work provides an effective approach to designing highly efficient non-noble metal multifunctional catalysts for practical applications in rechargeable metal-air batteries.
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