The stability of supercapacitors is the key factor for their use under high temperature, high voltage and long-term durability. To improve the supercapacitor stability, there is a need to understand the degradation mechanism. In this work, the degradation sites in a carbon electrode at negative potential range are investigated in two common organic electrolytes: 1 M Et₄NBF₄ dissolved in propylene carbonate and in acetonitrile. To elucidate the common factor over a wide range of carbon materials, we examined eight kinds of carbon materials including activated carbons, carbon blacks, zeolite-template carbon (high surface area and a large amount of carbon edge sites) and graphene mesosponge (high surface area and a little amount of carbon edge sites). Their surface structures are distinguished into two regions: carbon basal planes and edge sites by nitrogen physisorption and high-sensitivity temperature-programmed desorption up to 1800 °C. Unlike the degradation at positive potential range, initial degradation reactions at negative potential range occur mainly on the carbon basal planes rather than the edge sites. This finding is corroborated by the theoretical calculation.

超级电容器的稳定性是其在高温，高压和长期耐久性下使用的关键因素。为了提高超级电容器的稳定性，需要了解退化机理。在这项工作中，研究了两种常见有机电解质中碳电极在负电位范围内的降解位点：1 M Et ₄ NBF ₄溶于碳酸亚丙酯和乙腈。为了阐明各种碳材料的共同因素，我们检查了八种碳材料，包括活性炭，炭黑，沸石模板碳（高表面积和大量碳边缘位点）和石墨烯中ponsge（高表面积）。面积和少量碳边缘位点）。它们的表面结构分为两个区域：通过氮的物理吸附和高达1800°C的高灵敏度温度程序解吸，确定了碳基面和边缘部位。与在正电势范围内的降解不同，在负电势范围内的初始降解反应主要发生在碳基面上，而不是边缘部位。理论计算结果证实了这一发现。