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Construction of CoP/NiCoP Nanotadpoles Heterojunction Interface for Wide pH Hydrogen Evolution Electrocatalysis and Supercapacitor
Author(s) -
Lin Yan,
Sun Kaian,
Liu Shoujie,
Chen Xiaomeng,
Cheng Yuansheng,
Cheong WengChon,
Chen Zheng,
Zheng Lirong,
Zhang Jun,
Li Xiyou,
Pan Yuan,
Chen Chen
Publication year - 2019
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201901213
Subject(s) - materials science , supercapacitor , heterojunction , capacitance , chemical engineering , electrocatalyst , phosphide , dissociation (chemistry) , catalysis , nanotechnology , energy storage , optoelectronics , electrode , chemistry , electrochemistry , metal , thermodynamics , engineering , biochemistry , power (physics) , physics , metallurgy
Constructing well defined nanostructures is promising but still challenging for high‐efficiency catalysts for hydrogen evolution reaction (HER) and energy storage. Herein, utilizing the differences in surface energies between (111) facets of CoP and NiCoP, a novel CoP/NiCoP heterojunction is designed and synthesized with a nanotadpoles (NTs)‐like morphology via a solid‐state phase transformation strategy. By effective interface construction, the disorder in terms of electronic structure and coordination environment at the interface in CoP/NiCoP NTs is created, which leads to dramatically elevated HER performance within a wide pH range. Theoretical calculations prove that an optimized proton chemisorption and H 2 O dissociation are achieved by an optimized phosphide polymorph at the interface, accelerating the HER reaction. The CoP/NiCoP NTs are also proved to be excellent candidates for use in supercapacitors (SCs) with a high specific capacitance (1106.2 F g −1 at 1 A g −1 ) and good cycling stability (nearly 100% initial capacity retention after 1000 cycles). An asymmetric supercapacitor shows a high energy density (145 F g −1 at 1 A g −1 ) and good cycling stability (capacitance retention is 95% after 3200 cycles). This work provides new insights into the catalyst design for electrocatalytic and energy storage applications.