Citation: Xiao-Feng Zhang, Jian-Sheng Li, Wan-Sheng You, Zai-Ming Zhu. Ag_2-xO with highly exposed {111} crystal facets for efficient electrochemical oxygen evolution: Activity and mechanism[J]. Chinese Journal of Catalysis, ;2020, 41(11): 1706-1714. doi: 10.1016/S1872-2067(20)63574-4 shu

Ag_2-xO with highly exposed {111} crystal facets for efficient electrochemical oxygen evolution: Activity and mechanism

School of Chemistry and Chemical Engineering, Liaoning Normal University, Dalian 116029, Liaoning, China

Received Date: 12 February 2020
Revised Date: 24 March 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (21573099 and 21601077), and the Opening Project of Key Laboratory of Polyoxometalate Science of Ministry of Education.

A series of Ag_2-xO/FTO-i electrodes (where i denotes the current density during the electrodeposition, and i=0.5, 1, 2, 3, 4, or 7) was fabricated in 0.1 M K₂B₄O₇ electrolyte containing Ag⁺ ions by galvanostatic electrocrystallization. The electrode composition and morphology were characterized using X-ray powder diffraction, scanning electron microscopy, and X-ray photoelectron spectroscopy. The results reveal that the electrode films consist of Ag₂O, but some of the Ag⁺ ions on the {111} crystal facets are oxidized into Ag²⁺ ions. Furthermore, the Ag_2-xO/FTO-1 electrode shows a triangular slice shape of a parallel matrix with a larger exposed area of {111} crystal facets than other Ag_2-xO/FTO-i (i=0.5, 2, 3, 4, or 7) electrodes. Electrocatalytic experiments prove that the Ag_2-xO/FTO-1 electrode produces the highest oxidative current density, has an overpotential of 417 mV at 10 mA cm^-2, and has a Tafel slope of 47 mV dec^-1 in 0.1 M K₂B₄O₇. Electrochemical impedance spectra indicate that Ag_2-xO/FTO-1 electrodes have the best ability for charge transfer. In addition, in the I-t test over 10 h, the current density decreased 4%. Fortunately, both O-O and Ag²⁺ species were detected after electrocatalysis and a possible mechanism for the oxygen evolution reaction is proposed in which the formation of Ag²⁺ and O-O species on {111} facets plays a critical role.
- Ag₂O,
- Crystal facet,
- Ag²⁺ ions,
- Electrocatalysis,
- Water oxidation,
- Oxygen evolution reaction
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沈阳化工大学材料科学与工程学院沈阳 110142

Ag2-xO with highly exposed {111} crystal facets for efficient electrochemical oxygen evolution: Activity and mechanism

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通讯作者: 陈斌, bchen63@163.com

Ag_2-xO with highly exposed {111} crystal facets for efficient electrochemical oxygen evolution: Activity and mechanism