Wu Xiao-Tong, Li Jie-Cheng, Pan Qiu-Ren, Li Nan, Liu Zhao-Qing
School of Chemistry and Chemical Engineering/Guangzhou Key Laboratory for Environmentally Functional Materials and Technology/Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou 510006, PR China.
Dalton Trans. 2018 Jan 30;47(5):1442-1450. doi: 10.1039/c7dt04063f.
The sluggish kinetic rate-limiting oxygen reduction reaction (ORR) at the cathode remains the foremost issue hindering the commercialization of microbial fuel cells (MFCs). Utilization of the effect of micromolecule conjugation and the synergistic effect between Pd nanoparticles and N-rGO (nitrogen-doped reduced graphene oxide) to stabilize a precious metal onto carbon materials is a promising strategy to design and synthesize highly efficient cathode catalysts. In this study, gallic acid is used to facilitate the coupling of palladium (Pd) with N-rGO to form GN@Pd-GA via a simple hydrothermal process. Notably, the as-synthesized GN@Pd-GA as a cathode catalyst shows an approximately direct four-electron feature and demonstrates a high ORR performance in 0.1 M KOH. Furthermore, the stability and methanol tolerance of GN@Pd-GA are superior to those of the commercial Pt/C catalysts. In addition, a maximum power density of 391.06 ± 0.2 mW m of MFCs equipped with GN@Pd-GA was obtained, which was 96.2% of the power density of MFCs equipped with a commercial Pt/C catalyst.
阴极处缓慢的动力学限速氧还原反应（ORR）仍然是阻碍微生物燃料电池（MFC）商业化的首要问题。利用小分子共轭效应以及钯纳米颗粒与氮掺杂还原氧化石墨烯（N-rGO）之间的协同效应，将贵金属稳定在碳材料上，是设计和合成高效阴极催化剂的一种有前景的策略。在本研究中，没食子酸用于促进钯（Pd）与N-rGO的偶联，通过简单的水热过程形成GN@Pd-GA。值得注意的是，所合成的GN@Pd-GA作为阴极催化剂表现出近似直接的四电子特征，并在0.1 M KOH中展现出高ORR性能。此外，GN@Pd-GA的稳定性和甲醇耐受性优于商业Pt/C催化剂。此外，配备GN@Pd-GA的MFC的最大功率密度达到391.06±0.2 mW m，为配备商业Pt/C催化剂的MFC功率密度的96.2%。
