Khan Imran, Khan Salman, Wu Shiuan-Yau, Liu Linlin, Alodhayb Abdullah N, Mead James L, Ali Sharafat, Ul Hassan Sibt, Chen Hsin-Tsung, Ju Shin-Pon, Wang Shiliang
School of Physics and Electronics, Central South University, Changsha 410083, China.
Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China.
ACS Appl Mater Interfaces. 2025 Apr 9;17(14):21033-21052. doi: 10.1021/acsami.4c02468. Epub 2025 Mar 31.
High entropy materials exhibit unparalleled reactivity and tunable electrochemical properties, putting them at the forefront of advances in electrocatalysis for water splitting. Their various interfaces and elements are purposefully engineered at the nanoscale, which is essential to enhancing their electrochemical characteristics. The exceptional catalytic efficiency observed in graphene-coated nanoparticles (NPs) with an inner high-entropy alloy (HEA) (HEA@C) is a result of the combined action of several metallic constituents. However, increasing catalytic efficiency is still a very difficult task, particularly when it comes to obtaining precise control over the composition and structure via efficient synthesis techniques. HEA@C NPs exceptional reactivity and adaptable electrochemical characteristics allow them to perform better in slow oxygen evolution (SOE) activities. The novel multilayer graphene-enhanced HEA CoNiFeCuV@C NPs electrocatalyst presented in this work is carbon-based, and transmission electron microscopy (TEM) investigations verify its efficacy. The efficiency of the oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and oxygen reduction reaction (ORR) is greatly increased by this electrocatalyst. The electrocatalytic performance of the core-shell HEA CoNiFeCuV@C NPs is remarkable for HER, OER, and ORR, even though its highly stressed lattice has structural flaws. These catalysts reach a half-wave potential of 0.87 V in 0.1 M HClO at a moderate current density of 10 mA cm, with HER and OER onset potentials of 20 and 259 mV, respectively. Using cyclic voltammetry scans, the study delves deeper into the material's evolution by examining its morphology, chemical state, and elemental makeup both before and after activation. In addition to introducing novel electrocatalysts, this study significantly enhances our understanding of the deliberate synthesis of multicomponent intermetallic high-entropy alloys.
高熵材料展现出无与伦比的反应活性和可调控的电化学性质，使其处于析水电催化进展的前沿。它们的各种界面和元素在纳米尺度上经过精心设计，这对于增强其电化学特性至关重要。在具有内部高熵合金（HEA）的石墨烯包覆纳米颗粒（NPs）（HEA@C）中观察到的卓越催化效率是几种金属成分共同作用的结果。然而，提高催化效率仍然是一项非常艰巨的任务，特别是在通过高效合成技术精确控制组成和结构方面。HEA@C NPs卓越的反应活性和适应性电化学特性使其在缓慢析氧（SOE）活动中表现更优。本工作中提出的新型多层石墨烯增强型HEA CoNiFeCuV@C NPs电催化剂是碳基的，透射电子显微镜（TEM）研究证实了其有效性。这种电催化剂极大地提高了析氧反应（OER）、析氢反应（HER）和氧还原反应（ORR）的效率。核壳结构的HEA CoNiFeCuV@C NPs的电催化性能在HER、OER和ORR方面表现出色，尽管其高应力晶格存在结构缺陷。这些催化剂在0.1 M HClO中，在10 mA cm的中等电流密度下，HER和OER的起始电位分别为20和259 mV，半波电位为0.87 V。通过循环伏安扫描，该研究通过检查活化前后材料的形态、化学状态和元素组成，更深入地探究了材料的演变。除了引入新型电催化剂外，这项研究还显著增强了我们对多组分金属间高熵合金定向合成的理解。
