Modulated crystalline Ag-Ci oxygen-evolving catalysts for electrocatalytic water oxidation

In this paper we synthesized a crystalline Ag-Ci oxygen-evolution catalyst with an entirely new composition and structure in situ in a carbonate solution (pH = 8.3) with Ag+ at 70 °C. We studied the factors that influenced the synthesis of the oxygen-evolution catalyst (electrolyte environment tempe...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-01, Vol.39 (3), p.1364-1370
Main Authors: Zhao, Qiang, Yu, Zhuobin, Hao, Genyan, Yuan, Wen, Li, Jinping
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Carbonates
Electrodeposition
Electrolyte
Energy
Exact sciences and technology
Fuels
Hydrogen
In situ
Oxygen-evolving catalyst
Water splitting
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Summary:In this paper we synthesized a crystalline Ag-Ci oxygen-evolution catalyst with an entirely new composition and structure in situ in a carbonate solution (pH = 8.3) with Ag+ at 70 °C. We studied the factors that influenced the synthesis of the oxygen-evolution catalyst (electrolyte environment temperature, silver ion concentration, concentration of carbonates) under mild conditions. The structure, morphology, composition, and catalytic activity of Ag-Ci catalyst were analyzed using techniques such as X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and electrochemical measurements. Our results showed that the diffraction peaks of the Ag-Ci catalysts synthesized at 70 °C were consistent with the AgO phase and that the catalytic composition of the Ag-Ci catalyst was the AgⅠO/AgⅡO redox couple. The oxygen-evolution rate of the catalyst synthesized in a carbonate solution (pH = 8.3) at 70 °C was 50 times higher than that synthesized at 5 °C (18.3 μmol h−1); additionally, its oxygen evolution overpotential decreased to 246.7 mV. The electrolyte solution and Ag+ ion concentration greatly impacted the catalytic activity of the Ag-Ci catalyst for water splitting. [Display omitted] •The crystalline Ag-Ci catalyst has catalytic activity for water splitting.•The catalyst has a high oxygen-evolution rate of up to 18.3 μmol h−1.•The temperature of the electrolyte solution plays a key role.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2013.11.015