材料科学
过电位
电催化剂
无定形固体
纳米孔
过渡金属
催化作用
电解质
分解水
钴
纳米颗粒
化学工程
沸石咪唑盐骨架
纳米技术
复合数
金属有机骨架
电极
结晶学
电化学
物理化学
冶金
复合材料
有机化学
化学
吸附
工程类
光催化
作者
Yanmei Ren,Jiajun Wang,Wen-Jun Hu,Wen He,Yuping Qiu,Piaoping Tang,Muhua Chen,Ping Wang
标识
DOI:10.1021/acsami.1c08350
摘要
Transition metal borides (TMBs) are a class of important but less well-explored electrocatalytic materials for water splitting. The lack of an advanced methodology to synthesize complex nanostructured TMBs with tunable surface properties is a major obstacle to the exploration of the full potential of TMBs for electrocatalytic applications. Here, we report the facile fabrication of a cobalt foam (CF)-supported hierarchical nanostructured Co–Mo–B/CoMoO4–x composite using a hydrothermal method, followed by annealing and NaBH4 reduction treatments. Our study found that NaBH4 reduction of CoMoO4 resulted in the concurrent formation of amorphous Co–Mo–B and an O-vacancy-rich CoMoO4–x substrate, which cooperatively catalyzed the hydrogen evolution reaction (HER) in an alkaline electrolyte. The hierarchical nanoporous structure derived from the dehydration and partial reduction reactions of the CoMoO4·nH2O precursor could offer ample accessible active sites, as well as interconnected channels for rapid mass transfer. In addition, the in situ growth of electrically conductive Co–Mo–B nanoparticles on the defective structured CoMoO4–x substrate imparted the electrocatalyst with good electrical conductivity. As a result, the Co–Mo–B/CoMoO4–x/CF catalyst showed impressively high activity and outstanding stability for the alkaline HER, outperforming most reported TMB electrocatalysts. For instance, it required an overpotential of 55 mV to afford 10 mA·cm–2 and showed a fluctuation of only ±8 mV in a 100 h constant-current test at 100 mA·cm–2.
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