Key Laboratory for Water Quality and Conservation of Pearl River Delta, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, PR China; Guangzhou University-Linköping University Research Center on Urban Sustainable Development, Guangzhou University, Guangzhou, 510006, PR China.
Key Laboratory for Water Quality and Conservation of Pearl River Delta, Guangdong Provincial Key Laboratory of Radionuclides Pollution Control and Resources, School of Environmental Science and Engineering, Guangzhou University, Guangzhou, 510006, PR China; Hefei Hengli Equipment Ltd, Hefei, 230000, Anhui, PR China.
Environ Res. 2022 Nov;214(Pt 3):113968. doi: 10.1016/j.envres.2022.113968. Epub 2022 Aug 12.
Cathode electrocatalyst is quite critical to realize the application of microbial fuel cells (MFCs). Perovskite oxides have been considered as potential MFCs cathode catalysts to replace Pt/C. Herein, Cu-doped perovskite oxide with a stable porous structure and excellent conductivity was successfully prepared through a sol-gel method. Due to the incorporation of Cu, CaFeCuO has more micropores and a larger surface area, which are more conducive to contact with oxygen. Doping Cu resulted in more Fe in B-site and thus enhanced its binding capability to oxygen molecules. The data from electrochemical test demonstrated that the as-prepared catalyst has good conductivity, high stability, and excellent ORR properties. Compared with Pt/C catalyst, CaFeCuO exhibits a lower overpotential, which had an onset potential of 0.195 V and a half-wave potential of -0.224 V, respectively. CaFeCuO displays an outstanding four-electron pathway for ORR mechanism and demonstrates superiors corrosion resistance and stability. The MFC with CaFeCuO has a greater maximum power density (1090 mW m) rather than that of Pt/C cathode (970 mW m). This work demonstrated CaFeCuO is an economic and efficient cathodic catalyst for MFCs.
阴极电催化剂对于实现微生物燃料电池（MFC）的应用至关重要。钙钛矿氧化物已被认为是替代 Pt/C 的潜在 MFC 阴极催化剂。本文通过溶胶-凝胶法成功制备了具有稳定多孔结构和优异导电性的 Cu 掺杂钙钛矿氧化物。由于掺入了 Cu，CaFeCuO 具有更多的微孔和更大的表面积，更有利于与氧气接触。掺杂 Cu 导致 B 位有更多的 Fe，从而增强了其对氧分子的结合能力。电化学测试数据表明，所制备的催化剂具有良好的导电性、高稳定性和优异的 ORR 性能。与 Pt/C 催化剂相比，CaFeCuO 具有更低的过电势，其起始电位为 0.195 V，半波电位为-0.224 V。CaFeCuO 表现出出色的 ORR 机制四电子途径，并表现出超强的耐腐蚀性和稳定性。采用 CaFeCuO 的 MFC 的最大功率密度（1090 mW m）大于采用 Pt/C 阴极的 MFC（970 mW m）。这项工作表明，CaFeCuO 是一种用于 MFC 的经济高效的阴极催化剂。
