Designing and fabricating cheap and active bifunctional materials is crucial for the development of renewable energy technologies. In this article, three-dimensional nitrogen-doped porous carbon materials (NDPC-X, in which X represents the pyrolysis temperature) were fabricated by simultaneous carbonization and activation of polypyrrole-coated paper towel protected by a silica layer followed by acid etching. The material had a high specific surface area (1,123.40 m²/g). The as-obtained NDPC-900 displayed outstanding activity as a catalyst for the oxygen reduction reaction (ORR) as well as an electrode with a high specific capacitance in a supercapacitor in an alkaline medium. The NDPC-900 catalyst for the ORR exhibited a more positive reduction peak potential of –0.068 V (vs. Hg|HgCl₂) than that of Pt/C (–0.121 V), as well as better cycling stability and stronger methanol tolerance. Moreover, the NDPC-900 had a high specific capacitance of 379.50 F/g at a current density of 1 A/g, with a retention rate of 94.5% after 10,000 cycles in 6 mol/L KOH electrolyte when used as an electrode in a supercapacitor. All these results were attributed to the effect of a large surface area, which provided electrochemically active sites. This work introduces an effective way to use biomass-derived materials for the synthesis of promising bifunctional carbon material for electrochemical energy conversion and storage devices.

设计和制造廉价且活性的双功能材料对于可再生能源技术的发展至关重要。在本文中，通过同时碳化和活化由二氧化硅层保护的涂有聚吡咯的纸巾并进行酸蚀刻，制造了三维氮掺杂多孔碳材料（NDPC-X，其中X表示热解温度）。该材料具有高的比表面积（1,123.40 m ² / g）。如此获得的NDPC-900作为氧还原反应（ORR）的催化剂以及在碱性介质中的超级电容器中具有高比电容的电极表现出出色的活性。用于ORR的NDPC-900催化剂显示出更正的还原峰电位–0.068 V（vs。Hg | HgCl ₂）比Pt / C（–0.121 V）更高，循环稳定性更高，甲醇耐受性更强。此外，NDPC-900在1 A / g的电流密度下具有379.50 F / g的高比电容，当在6 mol / L KOH电解液中用作电极时，经过10,000次循环后的保留率为94.5％。超级电容器。所有这些结果均归因于大表面积的影响，这提供了电化学活性位点。这项工作介绍了一种有效的方法，利用生物质衍生的材料来合成用于电化学能量转换和存储设备的有前途的双功能碳材料。