Premium
A Bifunctional Hybrid Electrocatalyst for Oxygen Reduction and Evolution: Cobalt Oxide Nanoparticles Strongly Coupled to B,N‐Decorated Graphene
Author(s) -
Tong Yun,
Chen Pengzuo,
Zhou Tianpei,
Xu Kun,
Chu Wangsheng,
Wu Changzheng,
Xie Yi
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201702430
Subject(s) - electrocatalyst , bifunctional , tafel equation , overpotential , oxygen evolution , graphene , oxide , nanoparticle , materials science , chemical engineering , water splitting , hybrid material , chemistry , inorganic chemistry , nanotechnology , catalysis , electrochemistry , electrode , organic chemistry , metallurgy , photocatalysis , engineering
The electrocatalyzed oxygen reduction and evolution reactions (ORR and OER, respectively) are the core components of many energy conversion systems, including water splitting, fuel cells, and metal–air batteries. Rational design of highly efficient non‐noble materials as bifunctional ORR/OER electrocatalysts is of great importance for large‐scale practical applications. A new strongly coupled hybrid material is presented, which comprises CoO x nanoparticles rich in oxygen vacancies grown on B,N‐decorated graphene (CoO x NPs/BNG) and operates as an efficient bifunctional OER/ORR electrocatalyst. Advanced spectroscopic techniques were used to confirm formation of abundant oxygen vacancies and strong Co−N−C bridging bonds within the CoO x NPs/BNG hybrid. Surprisingly, the CoO x NPs/BNG hybrid electrocatalyst is highly efficient for the OER with a low overpotential and Tafel slope, and is active in the ORR with a positive half‐wave potential and high limiting current density in alkaline medium.