title: Three-dimensional macroporous NiCo(2)O(4) sheets as a non-noble catalyst for efficient oxygen reduction reactions.
abstract: A facile and low-cost strategy is developed to prepare three-dimensional (3D) macroporous NiCo2 O4 sheets, which can be used as a highly efficient non-noble metal electrocatalyst for the oxygen reduction reaction (ORR) in alkaline conditions. The as-obtained sheets have a thickness of about 150 nm and feature a typical 3D macroporous structure with pore volumes of up to 0.23 cm(3)  g(-1) , which could decrease the mass transport resistance and allow easier access of the reactants to the active surface sites. The as-prepared macroporous NiCo2 O4 sheets exhibit high electrocatalytic activity for ORR with a four-electron pathway, good long-term stability and high tolerance against methanol. The unique 3D macroporous structure and intrinsic properties may be responsible for their high performance.
authors.affiliation: Department of Chemistry, Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Institute of Technology, Beijing 100081 (P.R. China).
authors.forename: Ying
authors.initials: Y
authors.lastname: Xiao
authors.forename: Chuangang
authors.initials: C
authors.lastname: Hu
authors.forename: Liangti
authors.initials: L
authors.lastname: Qu
authors.forename: Changwen
authors.initials: C
authors.lastname: Hu
authors.forename: Minhua
authors.initials: M
authors.lastname: Cao
keywords: fuel cells; macroporous materials; metal oxides; nickel; spinel