期刊
NANOMATERIALS
卷 12, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/nano12010065
关键词
three-dimensional graphene; electrochemical polarization; electrocatalytic; individual and selective determination; isomers of benzenediol
类别
资金
- National Natural Science Foundation of China [21904117]
- Applied Technology Research and Development Program of Alxa League [AMYY2021-07]
- Zhejiang Provincial Natural Science Foundation of China [LY21B050003]
The challenge of simple and low-cost preparation of 3DG electrodes with high electrocatalytic ability still remains. An electrochemical polarization method is established to improve the hydrophilicity and electrocatalytic ability of graphene. Applied in the selective electrochemical detection of two isomers of benzenediol, the method achieves increased reversibility of redox reaction and high potential separation.
Three-dimensional graphene (3DG) with macroporous structure has great potential in the field of electroanalysis owing to a large active area, excellent electron mobility and good mass transfer. However, simple and low-cost preparation of 3DG electrodes with high electrocatalytic ability is still a challenge. Here, a fast and convenient electrochemical polarization method is established to pretreat free-standing 3DG (p-3DG) to offer high electrocatalytic ability. 3DG with monolithic and macroporous structure prepared by chemical vapor deposition (CVD) is applied as the starting electrode. Electrochemical polarization is performed using electrochemical oxidation (anodization) at high potential (+6 V) followed with electrochemical reduction (cathodization) at low potential (-1 V), leading to exposure of edge of graphene and introduction of oxygen-containing groups. The as-prepared p-3DG displays increased hydrophilicity and improved electrocatalytic ability. As a proof of concept, p-3DG was used to selective electrochemical detection of two isomers of benzenediol, hydroquinone (p-BD) and catechol (o-BD). In comparison with initial 3DG, p-3DG exhibits increased reversibility of redox reaction, improved peak current and good potential resolution with high potential separation between p-BD and o-BD. Individual or selective determination of p-BD or o-BD in single substance solution or binary mixed solution is realized. Real analysis of pond water is also achieved.
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