Journal
JOURNAL OF COORDINATION CHEMISTRY
Volume 73, Issue 17-19, Pages 2450-2461Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00958972.2020.1797700
Keywords
Polyoxometalates; carbon dots; electrocatalysis; methanol oxidation
Categories
Funding
- National Natural Science Foundation of China [21601077, 21573099]
- Natural Science Foundation of Liaoning Province [20180550544]
- Scientific research project of Liaoning Normal University [GD19L005]
- Opening Project of Key Laboratory of Polyoxometalate Science of Ministry of Education
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Development of high-efficiency anode electrocatalysts remains a challenge for direct methanol fuel cells (DMFCs). Herein, carbon dots (CDs) and Co-substituted sandwich polyoxometalate K-10[Co-4(H2O)(2)(PW9O34)(2)]center dot 20H(2)O (Co-POM) were selected as building blocks to construct a new ternary composite electrocatalyst CDs/Co-POM/Pt for application in the methanol oxidation reaction. CDs/Co-POM/Pt was characterized by FTIR, high resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectrum (EDX), element mapping, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results revealed that a nanoflower-like Pt nanostructure with high dispersion and uniformity was formed. The electrochemical experiments showed that CDs and Co-POM enhanced the electrocatalytic ability of Pt, and the highest peak current density of 7.98 mA cm(-2)was obtained for CDs/Co-POM/Pt, corresponding to 3.6 times, 6.5 times and 10.8 times as high as that of CDs/Pt, Co-POM/Pt and pure Pt. Also CDs/Co-POM/Pt had good stability in the electrocatalytic process. This work paves a way for development of polyoxometalate-based electrocatalysts.
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