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Structural and Interfacial Engineering of Ni2P/Fe3O4 Porous Nanosheet Arrays for Efficient Oxygen Evolution Reaction
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2021-09-20 , DOI: 10.1021/acs.inorgchem.1c02028
Wenli Tian 1 , Dengchao Zheng 1 , Xun Sun 1 , Xin Guan 1 , Hao Feng 1 , Chengyi Li 1 , Minglei Yan 2 , Yadong Yao 1
Affiliation  

Rational design of transition-metal phosphide (TMPs)-based electrocatalysts can effectively promote oxygen evolution reaction (OER). Herein, the novel efficient Ni2P/Fe3O4 porous nanosheets arrays supported on Ni foam (Ni2P/Fe3O4/NF) as alkaline OER catalysts were synthesized using structural and interfacial engineering. The three-dimensional (3D) porous hierarchical structure of Ni2P/Fe3O4/NF provides abundant active sites for OER and facilitates the electrolyte diffusion of ions and O2 liberation. Furthermore, the strong interfacial coupling and synergistic effect between Ni2P and Fe3O4 modify the electronic structure, resulting in the enhanced intrinsic activity. Consequently, the optimized Ni2P/Fe3O4/NF exhibits excellent OER performance with low overpotentials of 213 and 240 mV at 60 and 100 mA cm–2 in 1.0 M KOH, respectively, better than the RuO2/NF and most Ni/Fe-based OER catalysts. Impressively, it can maintain its catalytic activity for at least 20 h at 60 mA cm–2. In addition, the relationship between the structure and performance is fully elucidated by the experimental characterizations, indicating that the metal oxyhydroxides in situ generated on the surface of catalysts are responsible for the high OER activity.

中文翻译:

Ni2P/Fe3O4 多孔纳米片阵列的结构和界面工程用于高效的析氧反应

过渡金属磷化物(TMPs)基电催化剂的合理设计可以有效促进析氧反应(OER)。在此,使用结构和界面工程合成了作为碱性 OER 催化剂负载在泡沫镍上的新型高效 Ni 2 P/Fe 3 O 4多孔纳米片阵列(Ni 2 P/Fe 3 O 4 /NF)。Ni 2 P/Fe 3 O 4 /NF的三维 (3D) 多孔分级结构为 OER 提供了丰富的活性位点,并促进了离子的电解质扩散和 O 2 的释放。此外,Ni 之间的强界面耦合和协同效应2 P 和Fe 3 O 4改变了电子结构,导致本征活性增强。因此,优化的 Ni 2 P/Fe 3 O 4 /NF 表现出优异的 OER 性能,在 1.0 M KOH中 60 和 100 mA cm –2 下的过电位分别为 213 和 240 mV ,优于 RuO 2 /NF,并且大多数Ni/Fe 基 OER 催化剂。令人印象深刻的是,它可以在 60 mA cm –2 下保持至少 20 小时的催化活性. 此外,实验表征充分阐明了结构与性能之间的关系,表明催化剂表面原位生成的金属羟基氧化物是高OER活性的原因。
更新日期:2021-10-04
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