电解质
催化作用
杂原子
质子交换膜燃料电池
化学工程
碳纤维
纳米颗粒
材料科学
色散(光学)
纳米纤维
阴极
电催化剂
碳纳米纤维
化学
电化学
电极
纳米技术
有机化学
物理化学
复合材料
碳纳米管
戒指(化学)
工程类
复合数
光学
物理
作者
Srinu Akula,Prabakaran Varathan,Aiswarya Kesh,Kaido Tammeveski,Shaik Gouse Peera,Subhendu K. Panda,B. Bhuvaneshwari,A. K. Sahu
标识
DOI:10.1016/j.ijhydene.2022.04.163
摘要
Morphology of carbon nanofibers significantly effects Pt nanoparticles dispersion and specific interaction with the support, which is an important aspect in the fuel cell performance of the electrocatalysts. This study emphasizes, the defects creation and structural evolution comprised due to N–F co-doping on graphitic carbon nanofibers (GNFs) of different morphologies, viz. GNF-linearly aligned platelets (L), antlers (A), herringbone (H), and their specific interaction with Pt nanoparticle in enhancing the oxygen reduction reaction (ORR). GNFs–NF–Pt catalysts exhibit better ORR electrocatalytic activity, superior durability that is solely ascribed to the morphological evolution and the doped N–F heteroatoms, prompting the charge density variations in the resultant carbon fiber matrices. Amongst, H–NF–Pt catalyst performed outstanding ORR activity with exceptional electrochemical stability, which shows only 20 mV loss in the half-wave potential whilst 100 mV loss for Pt/C catalyst on 20,000 potential cycling. The PEMFC comprising H–NF–Pt as cathode catalyst with minimum loading of 0.10 mg cm−2, delivers power density of 0.942 W cm−2 at current density of 2.50 A cm−2 without backpressures in H2–O2 feeds. The H–NF–Pt catalyst owing to its hierarchical architectures, performs well in PEMFC at the minimized catalyst loading with outstanding stability that can significantly decrease total price for the fuel cell.
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