A crystalline/amorphous CoP@CoB hierarchical core-shell nanorod array for enhanced hydrogen evolution

Highly active, durable and cost-effective catalysts toward the hydrogen evolution reaction (HER) are crucial for widespread use of electrochemical water splitting in hydrogen production. Herein, a hierarchical core-shell nanorod array (NRA) comprising an inner crystalline CoP nanorod and an outer am...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-09, Vol.9 (35), p.19719-19724
Main Authors: Shi, Peidong, Zhang, Yu, Zhang, Guanglu, Zhu, Xiaojuan, Wang, Shaohua, Wang, An-Liang
Format: Article
Language:English
Subjects:
Arrays
Catalysts
Crystal structure
Crystallinity
Electrocatalysts
Electrochemistry
Electrolytes
Electron transport
Hydrogen
Hydrogen evolution reactions
Hydrogen production
Nanorods
Nanostructure
Structural hierarchy
Water splitting
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Summary:Highly active, durable and cost-effective catalysts toward the hydrogen evolution reaction (HER) are crucial for widespread use of electrochemical water splitting in hydrogen production. Herein, a hierarchical core-shell nanorod array (NRA) comprising an inner crystalline CoP nanorod and an outer amorphous CoB (a-CoB) nanosheet (CoP@a-CoB) is fabricated on conductive carbon cloth through a successive phosphidation-chronoamperometry-boronation strategy. The as-obtained catalyst exhibits excellent HER activity with low overpotentials of 56.3 and 81.2 mV at a current density of 10 mA cm −2 in alkaline and acidic electrolytes, respectively. Furthermore, it exhibits superior long-term stability with almost no activity degradation. The outstanding HER electrocatalytic performance might be attributed to the unique hierarchical core-shell NRA structure with the crystalline CoP nanorod as the core and the amorphous CoB nanosheet as the shell, which could not only provide abundant active sites, but also guarantee effective electron transport. This work opens up a promising way to rationally design high-efficient electrocatalysts for hydrogen production. A hierarchical nanoarray comprising an inner crystalline CoP nanorod and an outer amorphous CoB nanosheet exhibits excellent performance toward hydrogen evolution.
ISSN:2050-7488
2050-7496
DOI:10.1039/d1ta02783b