Wang Yanan, Jing Li, Jiang Wei, Wu Yuanyuan, Liu Bo, Sun Yantao, Chu Xianyu, Liu Chunbo
Key Laboratory of Preparation and Application of Environmental Friendly Materials (Jilin Normal University), Ministry of Education, Changchun 130103, PR China.
Key Laboratory of Preparation and Application of Environmental Friendly Materials (Jilin Normal University), Ministry of Education, Changchun 130103, PR China; Jilin Joint Technology Innovation Laboratory of Developing and Utilizing Materials of Reducing Pollution and Carbon Emissions, College of Engineering, Jilin Normal University, Siping 136000, PR China; The Joint Laboratory of Intelligent Manufacturing of Energy and Environmental Materials, Changchun 130103, PR China.
J Colloid Interface Sci. 2024 Oct;671:283-293. doi: 10.1016/j.jcis.2024.05.169. Epub 2024 May 23.
Reinforcing the development of efficient and robust electrocatalysts is pivotal in addressing the challenges associated with oxygen evolution reactions (OER) in water splitting technology. Here, an amorphous/crystalline low-ruthenium-doped bimetallic layered double hydroxide (LDH) electrocatalyst (a/c-CoCu + Ru-LDH/NF) with massive oxygen vacancy on nickel foam was fabricated via ion-exchange and chemical etching, facilitating efficient OER. Among the various catalyst materials tested, the a/c-CoCu + Ru-LDH/NF exhibits remarkable performance in the OER when employed in an alkaline electrolyte containing 1 M KOH. Achieving a minimal overpotential at 10 mA cm of 214 mV, exhibiting a low Tafel slope value of 64.3 mV dec and exceptional durability lasting for over 100 h. Theoretical calculations demonstrate that the electron structure and d-band center of CoCu-LDH can be effectively regulated through the utilization of a strategy possessing abundant oxygen vacancies and a Ru-doped crystalline/amorphous heterostructure. It will lead to optimized adsorption free energy of reactants and reduced energy barriers for OER. The construction strategy proposed in this paper for catalysts with amorphous/crystalline heterointerfaces offer a novel opportunity to achieve highly efficient OER.
加强高效且稳健的电催化剂的开发对于应对水分解技术中与析氧反应（OER）相关的挑战至关重要。在此，通过离子交换和化学蚀刻制备了一种在泡沫镍上具有大量氧空位的非晶态/晶态低钌掺杂双金属层状双氢氧化物（LDH）电催化剂（a/c-CoCu + Ru-LDH/NF），促进了高效的析氧反应。在所测试的各种催化剂材料中，a/c-CoCu + Ru-LDH/NF在含有1 M KOH的碱性电解质中用于析氧反应时表现出卓越的性能。在10 mA cm²时实现了214 mV的最小过电位，表现出64.3 mV dec⁻¹的低塔菲尔斜率值以及持续超过100小时的出色耐久性。理论计算表明，通过利用具有丰富氧空位和Ru掺杂的晶态/非晶态异质结构的策略，可以有效地调节CoCu-LDH的电子结构和d带中心。这将导致反应物的吸附自由能优化以及析氧反应的能垒降低。本文提出的具有非晶态/晶态异质界面的催化剂构建策略为实现高效析氧反应提供了新的机会。
