过电位
材料科学
纳米棒
催化作用
非阻塞I/O
纳米材料
析氧
插层(化学)
氧气
化学工程
纳米技术
无机化学
工程类
物理化学
有机化学
生物化学
化学
电化学
电极
作者
Jingjie Liu,Mengting Zheng,Jiantao Li,Yifei Yuan,Chenghang Li,Shanqing Zhang,Lin Yang,Zhengyu Bai,Jun Lü
标识
DOI:10.1002/adfm.202209753
摘要
Abstract Exploring efficient electrocatalysts for oxygen evolution reaction (OER) is an urgent need to advance the development of sustainable energy conversion. Though defect engineering is considered an effective strategy to regulate catalyst activity for enhanced OER performance, the controllable synthesis of defective oxides electrocatalysts remains challenging. Here, oxygen defects are introduced into NiCo 2 O 4 nanorods by an electrochemical lithiation strategy. By tuning in situ lithiation potentials, the concentration of oxygen defects and the corresponding catalytic activity can be feasibly regulated. In addition, the relationship between the changes in the defect density and electronic structure and the lithiation cut‐off voltages is revealed. The results show that NiCo 2 O 4 nanorods undertook intercalation and two‐step conversion reaction, in which the lithiation‐induced conversion reaction gives rise to a CoO@NiO‐based structure with higher defect density and lower oxidation states. As a result, the defective CoO@NiO‐based catalyst exhibits exceptional OER activity with an overpotential of 270 mV at 10 mA cm −2 , which is about 74 mV below the pristine nanomaterials. This research proposes a novel strategy to explore high‐performance catalysts with structural stability and defect control.
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