Interfacial Charge Transfer in a Hierarchical Ni2P/FeOOH Heterojunction Facilitates Electrocatalytic Oxygen Evolution

作者：Yawei Zhang, Lisha You, Qinglin Liu, Yinle Li, Tiesheng Li, Ziqian Xue, Guangqin Li · 发表于：ACS Applied Materials & Interfaces · 年份：2021 · DOI：10.1021/acsami.0c20204 · 被引用次数：73 · 研究领域：Electrocatalysts for Energy Conversion、Electrochemical Analysis and Applications、Fuel Cells and Related Materials

The construction of a heterojunction is an important strategy to develop efficient electrocatalysts. However, the precise design and preparation of the heterojunction with desirable catalytic performance remain a challenge. Herein, a hierarchical Ni 2 P/FeOOH Schottky junction supported on nickel foam was prepared by electrodeposition of FeOOH on the surface of Ni 2 P. The electrocatalytic activity of the Ni 2 P/FeOOH Schottky junction can be remarkably improved, owing to the unique hierarchical architecture and strong electron interaction in the Ni 2 P/FeOOH Schottky junction. As-prepared Ni 2 P/FeOOH exhibits excellent electrocatalytic activity for an oxygen evolution reaction (OER) with an ultralow overpotential of 246 mV to reach 100 mA cm –2 and a small Tafel slope of 62.8 mV dec –1 . This work provides not only a new method for the design of hierarchical nanomaterials but also an efficient strategy to design efficient OER electrocatalysts by constructing hierarchical heterojunctions.