title: Dual-phase spinel MnCo2O4 and spinel MnCo2O4/nanocarbon hybrids for electrocatalytic oxygen reduction and evolution.
abstract: Oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are essential reactions for energy-storage and -conversion devices relying on oxygen electrochemistry. High-performance, nonprecious metal-based hybrid catalysts are developed from postsynthesis integration of dual-phase spinel MnCo2O4 (dp-MnCo2O4) nanocrystals with nanocarbon materials, e.g., carbon nanotube (CNT) and nitrogen-doped reduced graphene oxide (N-rGO). The synergic covalent coupling between dp-MnCo2O4 and nanocarbons effectively enhances both the bifunctional ORR and OER activities of the spinel/nanocarbon hybrid catalysts. The dp-MnCo2O4/N-rGO hybrid catalysts exhibited comparable ORR activity and superior OER activity compared to commercial 30 wt % platinum supported on carbon black (Pt/C). An electrically rechargeable zinc-air battery using dp-MnCo2O4/CNT hybrid catalysts on the cathode was successfully operated for 64 discharge-charge cycles (or 768 h equivalent), significantly outperforming the Pt/C counterpart, which could only survive up to 108 h under similar conditions.
authors: Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research) , 3 Research Link, Singapore 117602, Singapore.
authors: Xiaoming
authors: X
authors: Ge
authors: Yayuan
authors: Y
authors: Liu
authors: F W Thomas
authors: FW
authors: Goh
authors: T S Andy
authors: TS
authors: Hor
authors: Yun
authors: Y
authors: Zong
authors: Peng
authors: P
authors: Xiao
authors: Zheng
authors: Z
authors: Zhang
authors: Suo Hon
authors: SH
authors: Lim
authors: Bing
authors: B
authors: Li
authors: Xin
authors: X
authors: Wang
authors: Zhaolin
authors: Z
authors: Liu