Abstract
Vulcan XC-72 is a carbon catalyst that is widely used in electrochemistry. The electrooxidation of SO2 plays a significant role in the domain of environmental protection. In this work, successive thermal and pyrolytic processes were applied to Vulcan XC-72 in order to obtain a modified catalyst that promotes SO2 electrooxidation to a much greater degree than Vulcan XC-72 does. The preparation of this modified XC-72 involved three steps: doping, pore creation, and carbonization. These modification processes were shown to greatly increase the catalytic activity of the modified XC-72 during SO2 electrooxidation. The catalytic performance of the modified XC-72 towards SO2 electrooxidation was characterized via linear sweep voltammograms and cyclic voltammograms; the results showed that the onset potential and the E imax/2 obtained with the modified XC-72 were 60 mV and 128 mV lower, respectively, than attained with Vulcan XC-72. The structural and physical properties of the modified XC-72 were characterized using TEM, XPS, and BET. The increased surface area and optimized pore structure of the modified XC-72, as well as the presence of pyridinic N constituents in this material, are believed to contribute to its enhanced capacity to catalyze the electrooxidation of SO2.
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Acknowledgements
This work was financially supported by the National Key Technology Support Program (no. 2015BAG06B00) and the Major Program of the National Natural Science Foundation of China (no. 61433013).
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Zhao, Q., Hou, M., Jiang, S. et al. Enhanced sulfur dioxide electrooxidation performance on a modified XC-72 carbon catalyst. J Solid State Electrochem 21, 3113–3120 (2017). https://doi.org/10.1007/s10008-017-3633-0
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DOI: https://doi.org/10.1007/s10008-017-3633-0