材料科学
过电位
非阻塞I/O
纳米片
塔菲尔方程
化学工程
氧化物
镍
双功能
阳极
碳纤维
析氧
电催化剂
电极
氧化镍
纳米技术
电化学
冶金
催化作用
复合材料
化学
物理化学
有机化学
工程类
复合数
作者
Zixu Sun,Xinghui Wang,Huahua Zhao,See Wee Koh,Junyu Ge,Yunxing Zhao,Pingqi Gao,Guangjin Wang,Hong Li
出处
期刊:Carbon energy
[Wiley]
日期:2019-10-21
卷期号:2 (1): 122-130
被引量:68
摘要
Abstract Transition metal oxides hold great promise for lithium‐ion batteries (LIBs) and electrocatalytic water splitting because of their high abundance and high energy density. However, designing and fabrication of efficient, stable, high power density electrode materials are challenging. Herein, we report rambutan‐like hollow carbon spheres formed by carbon nanosheet decorated with nickel oxide (NiO) rich in metal vacancies (denoted as h ‐NiO/C) as a bifunctional electrode material for LIBs and electrocatalytic oxygen evolution reaction (OER). When being used as the anode of LIBs, the h ‐NiO/C electrode shows a large initial capacity of 885 mA h g −1 , a robust stability with a high capacity of 817 mA h g −1 after 400 cycles, and great rate capability with a high reversible capacity of 523 mA h g −1 at 10 A g −1 after 600 cycles. Moreover, working as an OER electrocatalyst, the h ‐NiO/C electrode shows a small overpotential of 260 mV at 10 mA cm −2 , a Tafel slope of 37.6 mV dec −1 along with good stability. Our work offers a cost‐effective method for the fabrication of efficient electrode for LIBs and OER.
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