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Electrochemical estimation of active site density on a metal-free carbon-based catalyst

机译：无金属碳基催化剂上活性位点密度的电化学估计

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Nitrogen-doped carbon is synthesized by the heat-treatment of carbon in an ammoniacal atmosphere at different temperatures. The active site density and electrochemically active surface area (ESA) of carbon and nitrogen-doped carbon catalysts are estimated from the charge due to oxidation of the adsorbed anthraquinone-2-sulfonate (AQS) probe molecule. In the potential window of interest and over a range of concentrations, there is no unwanted side reaction or polymerization of the probe molecule that interferes with the electrochemical estimation of active site density. Most importantly, the adsorbed AQS can easily be removed from the electrode surface by potential cycling. The ORR activity and active site density of the catalysts derived from AQS-adsorption have similar trends. The active site density and turnover frequency towards ORR estimated using the AQS-adsorption method are in line with those reported in the literature by other methods. On the other hand, the results show that the wetted surface area estimated from the double layer capacitance does not always correlate with catalytic activity.
机译：通过在不同温度下的氨气氛中的碳的热处理来合成氮掺杂的碳。由于吸附的蒽醌-2-磺酸盐（AQS）探针分子的氧化，碳和氮掺杂碳催化剂的活性位点密度和电化学活性表面积（ESA）估计。在感兴趣的潜在窗口和一系列浓度上，没有不需要的副反应或聚合探针分子，其干扰有源位点密度的电化学估计。最重要的是，通过电位循环可以容易地从电极表面移除吸附的AQ。源自AQS吸附的催化剂的ORR活性和活性位点密度具有相似的趋势。使用AQS-Adsorption方法估计的ARR的有源部位密度和转换频率符合其他方法在文献中报告的那些。另一方面，结果表明，从双层电容估计的湿润表面积并不总是与催化活性相关的。

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