催化作用
塔菲尔方程
酞菁
石墨烯
电催化剂
堆积
钴
材料科学
化学工程
X射线光电子能谱
化学
纳米技术
无机化学
物理化学
有机化学
电化学
电极
工程类
作者
Shambhulinga Aralekallu,Sowmyashree Hadimane,Shantharaja,Manjunatha Nemakal,Lokesh Koodlur Sannegowda
出处
期刊:Fuel
[Elsevier]
日期:2024-04-01
卷期号:361: 130736-130736
标识
DOI:10.1016/j.fuel.2023.130736
摘要
The widespread practical applications of the fuel cells are dependent on the rational development of state-of-the-art easily synthesizable or earth-abundant catalysts for oxygen reduction reaction (ORR). This work demonstrates the utilization of cobalt phthalocyanine polymer (pCoPc) encased graphene (Gr) layer with an extensive π-π interaction as a proficient and non-precious electrocatalyst for ORR. The synthesized material is characterized by UV–vis, IR, Mass, NMR, SEM, TEM and XPS techniques. The fabricated Gr-pCoPc catalyst exhibited significant enhancement in the ORR performance which is comparable to the benchmark Pt/C catalyst with a decent durability in alkaline media. More importantly, the ORR onset potential at Gr-pCoPc shifted towards the positive potential by 10 mV compared to the Pt/C catalyst. The enhancement observed in the ORR performance and stability of the Gr-pCoPc catalyst could be attributed to the combined impact created by the outstanding electronic and conductive attributes of graphene, along with the π-stacking interactions inherent in pCoPc. In comparison to prior catalysts in literature and Pt/C, Gr-pCoPc displayed a notably lower Tafel slope of 64 mV dec-1 and larger double layer capacitance, Cdl value of 9.5 mF cm−2. The RDE experiments indicated that the hybrid composite of Gr-pCoPc facilitated an effective 4-electron pathway during ORR. Gr-pCoPc catalyst is highly durable towards ORR and it retained > 92.5 % of its initial ORR activity even after 5000 repeated cycles.
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