▎ 摘　　要

Electrocatalysts with high oxygen reduction reaction (ORR) activity are still of great significance to improve the performance of microbial fuel cells (MFCs). We report herein an approach to synthesize three-dimensional porous nitrogen-doped graphene (PNG) using cetyltrimethyl ammonium bromide (CTAB) micelles as soft templates. Based on this strategy, one type of PNG series, denoted PNG-15, is obtained by optimizing the mass ratios of CTAB and GO. This material exhibits a well-developed porous structure with a high surface area of 615.2 m(2) g(-1). The results of XRD, Raman spectroscopy, and XPS analyses verify that the superior porous structure of PNG-15 is beneficial to the formation of active centers. Therefore, this material shows an ORR electron transfer number of 3.88 +/- 0.10 in a neutral medium and comparable activity to commercial Pt/C. Such comparable performance of PNG-15 is preserved as a cathode electrocatalyst in MFCs in terms of voltage output, coulombic efficiency, and power density output. Furthermore, the PNG-15 demonstrates superior long-time stability to Pt/C during over two-months of operation. The findings confirm that the new material can serve as a promising cathode electrocatalyst in MFCs.