碳纤维
钴
过渡金属
无机化学
电解质
热解
化学
质子交换膜燃料电池
材料科学
化学工程
催化作用
电极
电化学
有机化学
物理化学
复合数
工程类
复合材料
作者
Srinu Akula,Marek Mooste,Jekaterina Kozlova,Maike Käärik,Alexey Treshchalov,Arvo Kikas,Vambola Kisand,Jaan Aruväli,Päärn Paiste,Aile Tamm,Jaan Leis,Kaido Tammeveski
标识
DOI:10.1016/j.cej.2023.141468
摘要
Delving into highly active and cost-efficient electrocatalysts for oxygen reduction reaction (ORR) is crucial for the large-scale application of polymer electrolyte fuel cells. Anion exchange membrane fuel cells (AEMFCs) are promising clean energy devices owing to their mild reaction conditions and the high probability of employing Pt-free catalysts for ORR. Developing the promising non-Pt ORR catalysts for AEMFC is still of great importance. Herein, we report the transition metal (Fe, Co, Mn, and Cu) impregnated melamine-phloroglucinol-formaldehyde (MPF) polymeric networks to derive metal-nitrogen-carbon (MNC) electrocatalysts via a robust synthesis route. The catalysts are screened through variable metal contents and different pyrolysis temperature optimizations by virtue of their ORR activity. The controlled synthesis method resulted to the prominent textural properties of the catalysts with efficient active centers to enhance the ORR performance. Amongst, iron-doped (MPF/Fe), and cobalt-doped (MPF/Co) catalysts are performing better in terms of half-wave potential (E1/2) values of 0.81 and 0.80 V vs RHE which is attributed to the highly active M−Nx sites and hierarchical porous structure of catalysts. Outstanding electrochemical stability in half-cell and high-power density in an AEMFC (up to 347 mW cm−2) made the present work drive to the development of highly efficient MNC catalysts for fuel cell applications.
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