设计具有受控纳米结构的高熵氧氢氧化物(HEO)电催化剂对于有效和稳定的水分解电催化剂至关重要。在这里,创建了一种新型HEOs材料(FeCoNiWCuOOH@Cu),该材料包含通过在3D双连续多孔Cu载体上电沉积而衍生的五种非贵金属元素。这种支持,通过液态金属去合金化方法制备,提供了一个高比表面积和快速的质量/电荷转移通道。所得的高熵FeCoNiWCuOOH纳米片提供了活性位点的密集分布。Cu骨架和FeCoNiWCuOOH纳米片之间的异质结构增强了传质,电子结构耦合,和整体结构稳定性,在析氧反应(OER)中产生优异的活性,析氢反应(HER),和水分解反应。在10mAcm-2时,OER的过电位,她,在1.0mKOH溶液中分解的水分别为200、18和1.40V,分别,表现优于大多数当前的电催化剂。即使在300mAcm-2下运行100、100和超过1000小时后,催化性能仍保持稳定,相应地。这种材料在集成氢能系统中具有潜在的应用。更重要的是,密度泛函理论(DFT)计算证明了五种元素在增强水分解活性方面的协同作用。这项工作为设计工业水电解系统提供了宝贵的见解。
Designing high-entropy oxyhydroxides (HEOs) electrocatalysts with controlled nanostructures is vital for efficient and stable water-splitting electrocatalysts. Herein, a novel HEOs material (FeCoNiWCuOOH@Cu) containing five non-noble metal elements derived by electrodeposition on a 3D double-continuous porous Cu support is created. This support, prepared via the liquid metal dealloying method, offers a high specific surface area and rapid mass/charge transfer channels. The resulting high-entropy FeCoNiWCuOOH nanosheets provide a dense distribution of active sites. The
heterostructure between Cu skeletons and FeCoNiWCuOOH nanosheets enhances mass transfer, electronic structure coupling, and overall structural stability, leading to excellent activities in the oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and water splitting reaction. At 10 mA cm-2, the overpotentials for OER, HER, and water splitting in 1.0 m KOH solution are 200, 18, and 1.40 V, respectively, outperforming most current electrocatalysts. The catalytic performance remains stable even after operating at 300 mA cm-2 for 100, 100, and over 1000 h, correspondingly. This material has potential applications in integrated hydrogen energy systems. More importantly, density functional theory (DFT) calculations demonstrate the synergy of the five elements in enhancing water-splitting activity. This work offers valuable insights for designing industrial water electrolysis systems.