双功能
电催化剂
电解
催化作用
材料科学
联氨(抗抑郁剂)
双功能催化剂
化学工程
无定形固体
电解水
无机化学
电极
分解水
电化学
纳米技术
化学
电解质
物理化学
有机化学
光催化
工程类
色谱法
作者
Kaixun Li,Jinfeng He,Xuze Guan,Yun Tong,Yutong Ye,Chun Lu,Pengzuo Chen
出处
期刊:Small
[Wiley]
日期:2023-06-22
卷期号:19 (42)
被引量:25
标识
DOI:10.1002/smll.202302130
摘要
Exploiting highly active and bifunctional catalysts for both hydrogen evolution reaction (HER) and hydrazine oxidation reaction (HzOR) is a prerequisite for the hydrogen acquisition. High-entropy materials have received widespread attention in catalysis, but the high-performance bifunctional electrodes are still lacking. Herein, a novel P-modified amorphous high-entropy CoFeNiCrMn compound is developed on nickel foam (NF) by one-step electrodeposition strategy. The achieved CoFeNiCrMnP/NF delivers remarkable HER and HzOR performance, where the overpotentials as low as 51 and 268 mV are realized at 100 mA cm-2 . The improved cell voltage of 91 mV is further demonstrated at 100 mA cm-2 by assessing CoFeNiCrMnP/NF in the constructed hydrazine-assisted water electrolyser, which is almost 1.54 V lower than the HER||OER system. Experimental results confirm the important role of each element in regulating the bifuncational performance of high-entropy catalysts. The main influencing elements seem to be Fe and Ni for HER, while the P-modification and Cr metal may contribute a lot for HzOR. These synergistic advantages help to lower the energy barriers and improve the reaction kinetics, resulting in the excellent bifunctional activity of the CoFeNiCrMnP/NF. The work offers a feasible strategy to develop self-supporting electrode with high-entropy materials for overall water splitting.
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