CoP and Ni2P implanted in a hollow porous N-doped carbon polyhedron for pH universal hydrogen evolution reaction and alkaline overall water splitting

Developing low-cost and highly active bifunctional electrocatalysts for water splitting is very important but still remains a challenge. Herein, a novel bifunctional electrocatalyst composed of CoP and Ni2P nanoparticles implanted in a hollow porous N-doped carbon polyhedron (CoP/Ni2P@HPNCP) is synt...

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Bibliographic Details
Published in:Nanoscale 2020-12, Vol.12 (46), p.23851-23858
Main Authors: Zhang, Run, Zhu, Ruolin, Li, Ye, Hui, Zhi, Song, Yuyan, Cheng, Yongliang, Lu, Jinjun
Format: Article
Language:English
Subjects:
Carbon
Electrocatalysts
Electrolytic cells
Electronic structure
Hydrogen evolution reactions
Hydroxides
Metal-organic frameworks
Nanoparticles
Oxidation
Oxygen evolution reactions
Phosphating (coating)
Polyhedra
Water splitting
Zeolites
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Summary:Developing low-cost and highly active bifunctional electrocatalysts for water splitting is very important but still remains a challenge. Herein, a novel bifunctional electrocatalyst composed of CoP and Ni2P nanoparticles implanted in a hollow porous N-doped carbon polyhedron (CoP/Ni2P@HPNCP) is synthesized by carbonization of Co/Ni-layered double hydroxide@zeolitic imidazolate framework-67 (Co/Ni-LDH@ZIF-67) followed by an oxidation and phosphorization strategy. The introduction of LDH can not only promote the formation of a hollow porous structure to supply more active sites, but also generate the CoP/Ni2P nanoheterostructure to afford extra active sites and modulate the electronic structure of the catalyst. As a result, CoP/Ni2P@HPNCP exhibits excellent pH universal hydrogen evolution reaction activity and alkaline oxygen evolution reaction activity. Furthermore, the electrolytic cell assembled from bifunctional CoP/Ni2P@HPNCP requires a cell voltage of 1.59 V in 1.0 M KOH at 10 mA cm−2, revealing its potential as a high performance bifunctional electrocatalyst.
ISSN:2040-3364
2040-3372
DOI:10.1039/d0nr07126a