Tri-metal-based hollow nanorods-on-microrod arrays as efficient water splitting electrocatalysts

• Published in: Journal of industrial and engineering chemistry (Seoul, Korea) 2022, 105(0), , pp.427-434
• Main Authors: Wang, Jianzhi, Yu, Hongliang, Wang, Xianming, Chen, Chen, Li, Shuaijie, Cai, Ning, Chen, Weimin, Xue, Yanan, Li, Hui, Yu, Faquan
• Format: Article
• Language: English
• Subjects: CoMnP; Cu3P; Hydrogen evolution reaction; Ordered porous structure; Oxygen evolution reaction; 화학공학
• ISSN: 1226-086X; 1876-794X
• DOI: 10.1016/j.jiec.2021.10.007

Hierarchical tri-metal-based hollow nano/micro rod-on-rod arrays are vertically grown on Cu foam by the cation-exchanging and anion exchanging approaches. Such ordered porous architecture, providing multi metal center, regular interconnection of macropore channel, large electrochemical surface area, small charge-transfer resistance, efficient mass transport and electron transfer for overall water splitting in alkaline media. [Display omitted] •Tri-Metal-based Hollow Nanorods-On-Microrod Arrays are vertically grown on Cu foam.•The ordered porous structure provides large electrochemical surface area and effective mass transfer.•A 3D layered micro-nano electrode material was synthesized in situ for electrocatalysis of HER and OER.•The composition and structure of the electrocatalyst were modulated to improve the catalytic performance. Constructing ordered hierarchical porous electrocatalysts while maintaining their high efficiency and stability for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is highly desirable but still remains challenging. Herein, hierarchical tri-metal-based hollow nano/micro rod-on-rod array structures, including hydroxides and phosphates, are vertically grown on Cu foam by the cation-exchanging and anion exchanging approaches. Such ordered porous architecture, providing multi metal center, regular interconnection of macropore channel, large electrochemical surface area, small charge-transfer resistance, efficient mass transport and electron transfer for overall water splitting in alkaline media. These obtained hydroxide OER catalysts (CoMn LDH@Cu(OH)2/CF) and phosphide HER catalysts (CoMnP@Cu3P/CF) exhibited low onset potential, low Tafel slope, and prominent durability. Such excellent performance, ordered porous structure and simple preparation methods indicate that this study provides a new strategy for assembling promising catalysts for water splitting and other applications.