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Porous Microrod Arrays Constructed by Carbon‐Confined NiCo@NiCoO 2 Core@Shell Nanoparticles as Efficient Electrocatalysts for Oxygen Evolution
Author(s) -
Xu Han,
Shi ZiXiao,
Tong YeXiang,
Li GaoRen
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201705442
Subject(s) - oxygen evolution , materials science , bimetallic strip , electrocatalyst , nanoparticle , nanotechnology , overpotential , chemical engineering , electrochemistry , electrode , metal , chemistry , metallurgy , engineering
The study of cost‐efficient and high‐performance electrocatalysts for oxygen evolution reaction (OER) has attracted much attention. Here, porous microrod arrays constructed by carbon‐confined NiCo@NiCoO 2 core@shell nanoparticles (NiCo@NiCoO 2 /C PMRAs) are fabricated by the reductive carbonization of bimetallic (Ni, Co) metal–organic framework microrod arrays (denoted as NiCo‐MOF MRAs) and subsequent controlled oxidative calcination. They successfully combine the desired merits including large specific surface areas, high conductivity, and multiple electrocatalytic active sites for OER. In addition, the oxygen vacancies in NiCo@NiCoO 2 /C PMRAs significantly improve the conductivity of NiCoO 2 and accelerate the kinetics of OER. The above advantages obviously enhance the electrocatalytic performance of NiCo@NiCoO 2 /C PMRAs. The experimental results demonstrate that the NiCo@NiCoO 2 /C PMRAs as electrocatalysts exhibit high catalytic activity, low overpotential, and high stability for OER in alkaline media. The strategy reported will open up a new route for the fabrication of porous bimetallic composite electrocatalysts derived from MOFs with controllable morphology for electrochemical energy conversion devices.