Department of Applied Chemistry, School of Science, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.
Nanotechnology. 2017 Jun 2;28(22):225401. doi: 10.1088/1361-6528/aa6ec3.
Fe-N/C composites are considered one of the most promising non-precious-metal electrocatalysts for oxygen reduction reaction (ORR). In this paper, we fabricate a novel and efficient carbon nanotube (CNT)-supported Fe-N/C composite catalyst, via the surface-self-polymerization of polydopamine and then the incorporation with Fe species on CNTs, followed by the pyrolysis process. The obtained catalyst demonstrates excellent electrocatalytic performance towards ORR in alkaline media. The modification of Fe-incorporated nitrogen-rich-carbons (Fe-CN) on CNTs lowers the ORR half-wave-potential by ∼190 mV, giving this catalyst with an onset ORR potential of 0.95 V (versus reversible hydrogen electrode (RHE)), a half-wave potential of 0.82 V (versus RHE), and the limiting current density of 5.39 mA cm in 0.1 M KOH. The performance of the as-prepared catalyst is comparatively better than the commercially available Pt/C in terms of positive half-wave potential and larger limiting current, superior durability, and higher tolerance to the methanol.
Fe-N/C 复合材料被认为是最有前途的非贵金属氧还原反应（ORR）电催化剂之一。本文通过多巴胺的表面自聚合，然后将 Fe 物种结合到 CNT 上，再经过热解过程，制备了一种新型高效的碳纳米管（CNT）负载的 Fe-N/C 复合催化剂。该催化剂在碱性介质中对 ORR 表现出优异的电催化性能。在 CNT 上修饰富氮碳中的 Fe（Fe-CN），将 ORR 的半波电位降低了约 190 mV，使该催化剂的起始 ORR 电位为 0.95 V（相对于可逆氢电极（RHE）），半波电位为 0.82 V（相对于 RHE），在 0.1 M KOH 中的极限电流密度为 5.39 mA cm。与商业 Pt/C 相比，所制备的催化剂的性能在正半波电位和更大的极限电流、更高的耐久性以及对甲醇更高的耐受性方面都有优势。
