非阻塞I/O
过电位
材料科学
双功能
密度泛函理论
化学工程
锂(药物)
电子转移
氧气
电极
电催化剂
析氧
电化学
催化作用
物理化学
化学
计算化学
有机化学
内分泌学
工程类
医学
生物化学
作者
Yu Yan,Zhiqun Ran,Ting Zeng,Xiaojuan Wen,Haoyang Xu,Runjing Li,Chuan Zhao,Chaozhu Shu
出处
期刊:Small
[Wiley]
日期:2022-01-14
卷期号:18 (10)
被引量:24
标识
DOI:10.1002/smll.202106707
摘要
Lithium-oxygen batteries (LOBs) with ultra-high theoretical energy density (≈3500 Wh kg-1 ) are considered as the most promising energy storage systems. However, the sluggish kinetics during the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) can induce large voltage hysteresis, inferior roundtrip efficiency and unsatisfactory cyclic stability. Herein, hydrangea-like NiO@Ni2 P heterogeneous microspheres are elaborately designed as high-efficiency oxygen electrodes for LOBs. Benefitting from the interfacial electron redistribution on NiO@Ni2 P heterostructure, the electronic structure can be modulated to ameliorate the chemisorption of the intermediates, which is confirmed by density functional theory (DFT) calculations and experimental characterizations. In addition, the interpenetration of the PO bond at the NiO@Ni2 P heterointerface leads to the internal doping effect, thereby boosting electron transfer to further improve ORR and OER activities. As a result, the NiO@Ni2 P electrode shows a low overpotential of only 0.69 V, high specific capacity of 18254.1 mA h g-1 and superior long-term cycling stability of over 1400 h. The exploration of novel bifunctional electrocatalyst in this work provides a new solution for the practical application of LOBs.
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