材料科学
过电位
双功能
电催化剂
电池(电)
氧化钴
钴
析氧
纳米颗粒
纳米技术
阴极
氮化物
化学工程
碳纤维
电极
催化作用
电化学
复合材料
复合数
图层(电子)
化学
冶金
有机化学
功率(物理)
物理化学
工程类
物理
量子力学
作者
Moon Gyu Park,Jeemin Hwang,Yaping Deng,Dong Un Lee,Jing Fu,Yongfeng Hu,Myeong Je Jang,Sung Mook Choi,Renfei Feng,Gaopeng Jiang,Lanting Qian,Qianyi Ma,Lin Yang,Yun Seok Jun,Min Ho Seo,Zhengyu Bai,Zhongwei Chen
标识
DOI:10.1002/adma.202311105
摘要
Developing commercially viable electrocatalyst lies at the research hotspot of rechargeable Zn-air batteries, but it is still challenging to meet the requirements of energy efficiency and durability in realistic applications. Strategic material design is critical to addressing its drawbacks in terms of sluggish kinetics of oxygen reactions and limited battery lifespan. Herein, a "raisin-bread" architecture is designed for a hybrid catalyst constituting cobalt nitride as the core nanoparticle with thin oxidized coverings, which is further deposited within porous carbon aerogel. Based on synchrotron-based characterizations, this hybrid provides oxygen vacancies and Co-Nx -C sites as the active sites, resulting from a strong coupling between CoOx Ny nanoparticles and 3D conductive carbon scaffolds. Compared to the oxide reference, it performs enhanced stability in harsh electrocatalytic environments, highlighting the benefits of the oxynitride. Furthermore, the 3D conductive scaffolds improve charge/mass transportation and boost durability of these active sites. Density functional theory calculations reveal that the introduced N species into hybrid can synergistically tune the d-band center of cobalt and improve its bifunctional activity. As a result, the obtained air cathode exhibits bifunctional overpotential of 0.65 V and a battery lifetime exceeding 1350 h, which sets a new record for rechargeable Zn-air battery reported so far.
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