Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy.
Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via della Ricerca Scientifica, 00133 Rome, Italy.
Bioelectrochemistry. 2022 Aug;146:108103. doi: 10.1016/j.bioelechem.2022.108103. Epub 2022 Mar 22.
This work reports the development of an iron-nitrogen-carbon electrocatalyst (Fe-N-C) synthesized by functionalization of carbon support using low-cost Fe- and N-based precursors in a wet impregnation procedure followed by a pyrolysis treatment under an inert atmosphere. Structure and surface chemistry were investigated by Raman and X-ray photoelectron spectroscopy (XPS), which indicated an efficient interaction of precursors with the carbon support during the wet-impregnations step, which allows obtaining a carbonized material with a high content of active sites based on Fe-N moieties. This led to Fe-N-C materials with high catalytic activity towards oxygen reduction at neutral pH, as demonstrated by cyclic voltammetry (CV) and hydrodynamic linear sweep voltammetry with rotating ring disk electrode (LSV-RRDE). The Fe-N-C electrocatalyst was incorporated in air-breathing cathodes and performance was optimized in terms of oxygen reduction activity and stability. Such cathodes were assembled in single-chamber microbial fuel cell prototypes, and electrical power and voltage generation were evaluated over time.
这项工作报道了一种铁-氮-碳电催化剂（Fe-N-C）的开发，该催化剂是通过在惰性气氛下的热解处理，使用低成本的铁和氮基前体制备，对碳载体进行功能化合成的。通过拉曼和 X 射线光电子能谱（XPS）对其结构和表面化学进行了研究，结果表明在前体的湿浸渍步骤中与碳载体之间存在有效的相互作用，这使得能够获得一种基于 Fe-N 基团的高含量活性位点的碳化材料。这导致 Fe-N-C 材料在中性 pH 下对氧还原具有高催化活性，这通过循环伏安法（CV）和带有旋转环盘电极（RRDE）的动力学线性扫描伏安法（LSV-RRDE）得到了证明。将 Fe-N-C 电催化剂掺入空气呼吸阴极中，并在氧还原活性和稳定性方面对其进行了优化。将这些阴极组装在单室微生物燃料电池原型中，并随着时间的推移评估其电能和电压的产生。
