杨瑞枝课题组在J. Mater. Chem. A 上发表论文
标题：Facile synthesis and excellent electrochemical properties of NiCo2O4 spinel nanowire arrays as a bifunctional catalyst for the oxygen reduction and evolution reaction
作者：Chao Jin, Fanliang Lu, Xueche ng Cao, Zhen rong Yang and Ruizhi Yang*
摘要：Developing catalysts with high electrocatalytic activity for an oxygen reduction reaction (ORR) and oxygen
evolution reaction (OER) has recently attracted much attention because the sluggish kinetics of these two
reactions limits the performance and commercialization of fuel cells and metal – air batteries. Herein, a facile
template-free co-precipitation route was reported for the design and fabrication of well-ordered NiCo2O4
(NCO) spinel nanowire arrays. The as-prepared NCO spinel nanowire arrays are characterized by XRD, SEM,
TEM, BET and XPS. BET results show that NCO spinel nanowire arrays have a mesoporous (ca. 8 nm)structure and a high specific surface area of 124 m2g 1. The catalytic activity of NCO spinel nanowire
arrays for the ORR and the OER in 0.1 M KOH solution has been studied by using a rotating ring-disk
electrode (RRDE) technique. RRDE results show that the NCO spinel nanowire array catalyst exhibits
excellent catalytic activity for the ORR. The ORR mainly favors a direct four electron pathway, which is
close to the behavior of the Pt/C (20 wt% Pt on carbon) electrocatalyst under the same testing
conditions. Anodic linear scanning voltammogram results show that the NCO spinel nanowire array
catalyst is more active for the OER. The chronoamperometric and cyclic voltammogram tests show that
the NCO spinel nanowire array catalyst exhibits excellent stability and reversibility for the ORR and the OER.