Liying Han
(, ), Yongkang Dong
(, ), Haotian Zhao
(, ), Jinfeng Zhang
(, ), Jie Liu
(, ), Cheng Zhong
(, ), Wenbin Hu
(, )
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引用次数: 0
摘要
开发一种高效、稳定的双功能水分解电催化剂至关重要。在此，我们在室温下通过简单的两步电沉积策略，在Ni泡沫（NF）表面开发了pt修饰的FeCoNiMnCr高熵（氧）氢氧化物（HEH）作为双功能催化剂。所得的Pt/FeCoNiMnCr HEH/NF呈现出由相互连接的超薄纳米片组成的三维多孔结构，有利于反应过程中较大的活性表面积和离子/质量传输。Pt/FeCoNiMnCr HEH电催化剂表现出优异的电催化性能，在100 mA cm−2下析氧反应（OER）的过电位为306 mV，在50 mA cm−2下析氢反应（HER）的过电位仅为116 mV。Pt/FeCoNiMnCr HEH独特的超薄纳米片结构以及Pt纳米粒子与FeCoNiMnCr HEH之间的电子耦合效应可以增强催化性能。此外，pt修饰的FeCoNiMnCr HEH催化剂作为水分解的阴极和阳极，只需要1.56 V就可以达到20 mA cm - 2的电流密度，并且稳定运行超过50小时。该策略为构建高效的双功能水分解电催化剂提供了新的思路。
Pt-decorated high entropy FeCoNiMnCr (Oxy) hydroxides as a bifunctional electrocatalyst towards electrochemical water splitting
Developing a high-efficiency and stable bifunctional electrocatalyst for water splitting is vitally essential. Herein, we developed the Pt-decorated FeCoNiMnCr high-entropy (Oxy) hydroxides (HEH) on the surface of Ni foam (NF) as a bifunctional catalyst through a facile two-step electrodeposition strategy at ambient temperature. The obtained Pt/FeCoNiMnCr HEH/NF exhibited three-dimensional porous structures composed of interconnected ultrathin nanosheets, favoring the large active surface area and ions/mass transport during the reaction. The Pt/FeCoNiMnCr HEH electrocatalyst displayed exceptional electrocatalytic performance, achieving a low overpotential of 306 mV at 100 mA cm−2 for oxygen evolution reaction (OER) and only 116 mV at 50 mA cm−2 for hydrogen evolution reaction (HER), respectively. The enhanced catalytic performance could be attributed to the synergistic effect of the unique ultrathin nanosheet structure of Pt/FeCoNiMnCr HEH and the electronic coupling effect between Pt nanoparticles (NPs) and FeCoNiMnCr HEH. Furthermore, the Pt-decorated FeCoNiMnCr HEH catalyst employed as both the cathode and anode toward water splitting required only 1.56 V to achieve a current density of 20 mA cm−2 and stably operated for over 50 h. This strategy provides a novel idea for the construction of efficient bifunctional electrocatalysts for water splitting.
期刊介绍：
Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.
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