纳米片
过电位
析氧
材料科学
分解水
催化作用
电化学
化学工程
制氢
纳米技术
电极
化学
物理化学
生物化学
光催化
工程类
作者
Wenli Zhao,Fenghua Xu,Luqiong Liu,Min Liu,Biing-Jyh Weng
标识
DOI:10.1002/adma.202308060
摘要
Abstract Oxygen electrochemistry plays a key role in renewable energy technologies, such as fuel cells and electrolyzers, but its slow kinetics limits the performance and the commercialization of such devices. Here, a strained MnO 2 nanosheet induced by Ir incorporation is developed with optimized electronic structure by a simple hydrothermal method. With the incorporation of Ir, the strain induces elongated Mn ─ O bond length, and thereby tuning the electronic structure to favor the oxygen evolution reaction (OER) performance. The obtained catalyst exhibits an excellent mass activity of 5681 A g −1 at an overpotential of 300 mV in 0.5 m H 2 SO 4 , and reaches 50 and 100 mA cm −2 at overpotentials of only 240 and 277 mV, respectively. The catalyst is also stable even at 300 mA cm −2 in 0.5 m H 2 SO 4 . Using the nanosheet as the OER catalyst and the Pt/C as the hydrogen evolution reaction catalyst, a two‐electrode electrolyzer achieves 10 mA cm −2 with only a cell voltage of 1.453 V for overall water splitting in 0.5 m H 2 SO 4 . This strategy enables the material with high feasibility for practical applications on hydrogen production.
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