Electrochemical Properties of Graphene Modified Mixed Metal Oxide Anodes of Ti/IrTaSnSb-G in NaCl Solutions at Low Temperature

doi:10.11902/1005.4537.2019.185

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (3): 289-294 DOI: 10.11902/1005.4537.2019.185

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Electrochemical Properties of Graphene Modified Mixed Metal Oxide Anodes of Ti/IrTaSnSb-G in NaCl Solutions at Low Temperature

WANG Tingyong¹^,²(

), DONG Ruyi², XU Shi², WANG Hui²

1 Luoyang Ship Material Research Institute, Luoyang 471000, China
2 Sunrui Marine Environment Engineering Co. , Ltd. , Qingdao 266101, China

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Abstract

Graphene-modified mixed metal oxide anodes of Ti/IrTaSnSb-G were prepared by thermal decomposition, and then the electrochemical performance of the anodes in NaCl solutions was examined via electrochemical workshop type PAR2273 and SEM equipped with EDS in terms of the effect of graphene on the performance of anodes. The results show that the graphene promotes the segregation of IrO₂, which then resulted in the formation of dendritic structure on the surface of the anodes, in the meanwhile, secondary crystallization phenomenon could induce the formation of nano-needle structure of IrO₂, which increases the active surface areas and improves subsequently the electrocatalytic activity of the anodes. Besides, the electrolysis current efficiency of the electrode with 0.6 g/L graphene increases 9% in 3.5%NaCl solution at 5 ℃ and 13% in 1.5%NaCl solution at 15 ℃ respectively.

Key words: graphene oxide anode electrochemical activity current efficiency

Received: 20 October 2019

ZTFLH:

O646

Corresponding Authors: WANG Tingyong E-mail: wangty@sunrui.net

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Cite this article:

WANG Tingyong, DONG Ruyi, XU Shi, WANG Hui. Electrochemical Properties of Graphene Modified Mixed Metal Oxide Anodes of Ti/IrTaSnSb-G in NaCl Solutions at Low Temperature. Journal of Chinese Society for Corrosion and protection, 2020, 40(3): 289-294.

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https://www.jcscp.org/EN/10.11902/1005.4537.2019.185 OR https://www.jcscp.org/EN/Y2020/V40/I3/289

Fig.1 FTIR spectra of the Ti/IrTaSnSb-G anodes

Fig.2 FESEM micrographs of the Ti/IrTaSnSb-G anodes without graphene (a, c) and with graphene (b, d)

Table 1 Surface compositions of Ti/IrTaSnSb-G anodes with different graphene contents (mol fraction / %)

Fig.3 Cyclic voltammorgrams of Ti/IrTaSnSb-G anodes with different contents of graphene

Fig.4 Voltammetric charges of Ti/IrTaSnSb-G anodes with different contents of graphene

Fig.5 Porlarization curves of Ti/IrTaSnSb-G anodes with different contents of graphene in 1.5%NaCl solution at 15 ℃

Fig.7 Nyquist plots of Ti/IrTaSnSb-G anodes with different contents of grapheme

Fig.6 Equivalent resistance of Ti/IrTaSnSb-G electrode in 1.5%NaCl solution

Table 2 Impedance parameters of the Ti/IrTaSnSb-G anodes with different contents

Fig.8 Current efficiency of the Ti/IrTaSnSb-G anodes in 3.5%NaCl solution at 5 ℃ and 1.5%NaCl solution at 15℃

Fig.9 Accelerated lifetime of the Ti/IrTaSnSb-G anodes in 0.5 mol·L^-1 H₂SO₄ solution at 40 ℃

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