Journal article
Bimetallic Cobalt-Based Phosphide Zeolitic Imidazolate Framework: CoPx Phase-Dependent Electrical Conductivity and Hydrogen Atom Adsorption Energy for Efficient Overall Water Splitting
Advanced energy materials, Vol.7(2), pp.1-9
01/01/2017
Abstract
Cobalt-based bimetallic phosphide encapsulated in carbonized zeolitic imadazolate frameworks has been successfully synthesized and showed excellent activities toward both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Density functional theory calculation and electrochemical measurements reveal that the electrical conductivity and electrochemical activity are closely associated with the Co2P/CoP mixed phase behaviors upon Cu metal doping. This relationship is found to be the decisive factor for enhanced electrocatalytic performance. Moreover, the precise control of Cu content in Co-host lattice effectively alters the Gibbs free energy for H* adsorption, which is favorable for facilitating reaction kinetics. Impressively, an optimized performance has been achieved with mild Cu doping in Cu0.3Co2.7P/nitrogen-doped carbon (NC) which exhibits an ultralow overpotential of 0.19 V at 10 mA cm(-2) and satisfying stability for OER. Cu0.3Co2.7P/NC also shows excellent HER activity, affording a current density of 10 mA cm(-2) at a low overpotential of 0.22 V. In addition, a homemade electrolyzer with Cu0.3Co2.7P/NC paired electrodes shows 60% larger current density than Pt/RuO2 couple at 1.74 V, along with negligible catalytic deactivation after 50 h operation. The manipulation of electronic structure by controlled incorporation of second metal sheds light on understanding and synthesizing bimetallic transition metal phosphides for electrolysis-based energy conversion.
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Details
- Title
- Bimetallic Cobalt-Based Phosphide Zeolitic Imidazolate Framework: CoPx Phase-Dependent Electrical Conductivity and Hydrogen Atom Adsorption Energy for Efficient Overall Water Splitting
- Creators
- Junhua Song - Washington State UniversityChengzhou Zhu - Washington State UniversityBo Z. Xu - Washington State UniversityShaofang Fu - Washington State UniversityMark H. Engelhard - Pacific Northwest National LaboratoryRanfeng Ye - Washington State UniversityDan Du - Washington State UniversityScott P. Beckman - Washington State UniversityYuehe Lin - Washington State University
- Publication Details
- Advanced energy materials, Vol.7(2), pp.1-9
- Academic Unit
- School of Mechanical and Materials Engineering
- Publisher
- Wiley
- Number of pages
- 9
- Grant note
- Washington State University Department of Energy's Office of Biological and Environmental Research; United States Department of Energy (DOE) DE-AC05-76RL01830 / DOE; United States Department of Energy (DOE)
- Identifiers
- 99901227639001842
- Language
- English
- Resource Type
- Journal article