title: Enhanced hydrogen evolution reaction on hybrids of cobalt phosphide and molybdenum phosphide.
abstract: Production of hydrogen from water electrolysis has stimulated the search of sustainable electrocatalysts as possible alternatives. Recently, cobalt phosphide (CoP) and molybdenum phosphide (MoP) received great attention owing to their superior catalytic activity and stability towards the hydrogen evolution reaction (HER) which rivals platinum catalysts. In this study, we synthesize and study a series of catalysts based on hybrids of CoP and MoP with different Co/Mo ratio. The HER activity shows a volcano shape and reaches a maximum for Co/Mo = 1. Tafel analysis indicates a change in the dominating step of Volmer-Hyrovský mechanism. Interestingly, X-ray diffraction patterns confirmed a major ternary interstitial hexagonal CoMoP2crystal phase is formed which enhances the electrochemical activity.
authors.affiliation: Center for Condensed Matter Sciences , National Taiwan University , Taipei 10617 , Taiwan, Republic of China.
authors.forename: Si-Ling
authors.initials: SL
authors.lastname: Fang
authors.affiliation: Center for Condensed Matter Sciences , National Taiwan University , Taipei 10617 , Taiwan, Republic of China.
authors.forename: Tsu-Chin
authors.initials: TC
authors.lastname: Chou
authors.affiliation: Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan, Republic of China; Department of Chemistry, National Tsing Hua University, Hsinchu 30012, Taiwan, Republic of China.
authors.forename: Satyanarayana
authors.initials: S
authors.lastname: Samireddi
authors.affiliation: Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan, Republic of China; Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan, Republic of China.
authors.forename: Kuei-Hsien
authors.initials: KH
authors.lastname: Chen
authors.affiliation: Center for Condensed Matter Sciences , National Taiwan University , Taipei 10617 , Taiwan, Republic of China.
authors.forename: Li-Chyong
authors.initials: LC
authors.lastname: Chen
authors.affiliation: Center for Condensed Matter Sciences , National Taiwan University , Taipei 10617 , Taiwan, Republic of China.
authors.forename: Wei-Fu
authors.identifier: 0000-0002-3009-0196
authors.initials: WF
authors.lastname: Chen
keywords: cobalt phosphide; electrocatalyst; hydrogen evolution reaction; molybdenum phosphide; ternary