FeNi-functionalized 3D N, P doped graphene foam as a noble metal-free bifunctional electrocatalyst for direct methanol fuel cells
FeNi-functionalized 3D N, P doped graphene foam as a noble metal-free bifunctional electrocatalyst for direct methanol fuel cells
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FeNi功能化3D N、P掺杂石墨烯泡沫作为直接甲醇燃料电池的无贵金属双功能电催化剂
DOI：
10.1016/j.jallcom.2021.158732
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发表时间：
2021-02
影响因子：
6.2
通讯作者：
Xieraili Maimaitiyiming
中科院分区：
文献类型：
--
作者：
Caijin Shi;Xieraili Maimaitiyiming
设计高性能的氧还原（ORR）和甲醇氧化（莫尔）双功能电催化剂是直接甲醇燃料电池广泛应用的关键。在此，我们通过简单且经济的一步热解方法制备了一种新型三维（3D）FeNi功能化的N，P掺杂石墨烯泡沫（FeNi@NP-GF），作为直接甲醇燃料电池的优良双功能电催化剂。与无金属和过渡金属单掺杂的石墨烯泡沫催化剂（NP-GF、Fe@NP-GF和Ni@NP-GF）相比，所得FeNi@NP-GF催化剂在ORR反应中表现出更正的半波电位和更高的极限电流密度。在碱性介质中，该催化剂表现出四电子转移过程和较强的抗甲醇渗透能力。上述结果归因于由Fe/Ni和N物种形成的Fe/Ni-Nx物种与3D多孔石墨烯材料中的多个活性位点的协同效应。此外，FeNi@NP-GF还可以作为Pt纳米颗粒（NP）的良好载体。Pt/FeNi@NP-GF催化剂对酸性介质中的甲醇电氧化反应表现出显着的催化性能和高稳定性。
Designing high-performance bifunctional electrocatalysts for oxygen reduction (ORR) and methanol oxidation (MOR) reaction is essential for the wide application of direct methanol fuel cells. Here, we have prepared a novel three-dimensional (3D) FeNi-functionalized N, P doped graphene foam (FeNi@NP-GF) by a simple and cost-effective one-step pyrolysis method, as excellent bifunctional electrocatalyst for direct methanol fuel cells. Compared with metal-free and transition metal single-doped graphene foam catalysts (NP-GF, Fe@NP-GF and Ni@NP-GF), the resulting FeNi@NP-GF catalyst showed more positive half-wave potential and higher limiting current density in ORR reaction. Furthermore, it manifests a four-electron transfer process and strong methanol crossover resistance in the alkaline medium. The above results ascribed to the synergistic effect of Fe/Ni-Nx species formed with Fe/Ni and N species and multiple active sites in the 3D porous graphene material. Moreover, FeNi@NP-GF acted as good support for Pt nanoparticles (NPs). Pt/FeNi@NP-GF catalyst displayed remarkable catalytic performance and high stability for methanol electrooxidation reaction in acid medium.
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