氢氧化物
材料科学
析氧
电解
碱性水电解
氧气
电解水
离子
无机化学
离子交换
对偶(语法数字)
分解水
膜
化学工程
催化作用
电极
电化学
化学
有机化学
物理化学
电解质
文学类
工程类
艺术
光催化
生物化学
作者
Yue Shi,Lumin Song,Yan Liu,Tiantian Wang,Caixia Li,Jianping Lai,Lei Wang
标识
DOI:10.1002/aenm.202402046
摘要
Abstract Nickel‐iron layered double hydroxide (LDH) is a promising cost‐efficient catalyst to replace noble metals for alkaline oxygen evolution reaction (OER), yet its intrinsic activity under high current density conditions is not satisfactory, which greatly constrains the industrial application of NiFe LDH catalysts. Herein, a new class of integrated Co and W co‐doped NiFe LDH catalysts is reported with dual cocatalytic sites for alkaline OER catalysis. The optimized Co 2.8 , W 3.8 ‐NiFe LDH integrated catalyst has superior alkaline OER activity (255 mV@1000 mA cm −2 ) and excellent catalytic stability (200 h@500 mA cm −2 ). The turnover frequency value of Co 2.8 , W 3.8 ‐NiFe LDH can reach 4.02 s −1 at 1.49 V versus RHE, which is 9.6 times higher than that of NiFe LDH and superior to the noble metal catalysts. Moreover, it can achieve 1.0 A cm −2 at 1.86 V and maintain 300‐h stable operation in anion exchange membrane water electrolyzer. Theoretical and experimental studies indicate that W sites promote the *OH adsorption and Co sites favor protons desorption of OH*. These dual cocatalytic sites jointly promote *O coverage, effectively accelerating alkaline OER kinetic.
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