Developing catalysts with outstanding performance for oxygen evolution reaction (OER) is crucial to advance energy conversion technologies. In these regards, catalysts based on 3d transition metals have recently attracted much attention, yet further development is required. Here, we present a new type of heterostructure catalyst in which CoO nanowire arrays are hybridized with tungsten nanoparticles (W-CoO), and are self-supported on conductive carbon cloth (CC). Electronic coupling effects at the W-CoO heterointerface promote electron transfer and OER kinetics to expedite the formation of oxyhydroxide species, which are the active sites for OER processes. A variety of in situ and ex situ characterization methods are employed to reveal deep insights into surface transformations and investigate the relationship between the conversion to oxyhydroxide moieties and OER performance. This report presents new understanding of the rational design and synthesis of catalysts that exhibit outstanding performance as electrochemical water splitting electrode for OER.

开发具有出色析氧反应 (OER) 性能的催化剂对于推进能量转换技术至关重要。在这些方面，基于 3d 过渡金属的催化剂最近引起了很多关注，但还需要进一步的发展。在这里，我们提出了一种新型异质结构催化剂，其中 CoO 纳米线阵列与钨纳米粒子 (W-CoO) 杂化，并自支撑在导电碳布 (CC) 上。W-CoO 异质界面处的电子耦合效应促进了电子转移和 OER 动力学，以加速羟基氧化物物种的形成，这是 OER 过程的活性位点。各种原位和非原位表征方法被用来揭示对表面转化的深入见解，并研究向羟基氧化物部分的转化与 OER 性能之间的关系。本报告提出了对催化剂的合理设计和合成的新理解，这些催化剂作为 OER 的电化学水分解电极表现出优异的性能。