Regulation of Morphology and electronic structure of NiSe2 by Fe for high effective oxygen evolution reaction.,Chemistry - An Asian Journal

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Regulation of Morphology and electronic structure of NiSe2 by Fe for high effective oxygen evolution reaction.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-09-11 , DOI: 10.1002/asia.202000860
Yunxiao Li ₁ , Ru Chen ₁ , Dafeng Yan ₁ , Shuangyin Wang ₁

Affiliation

With the development of hydrogen‐energy economy, it is urgent for researchers to explore high effective non‐noble metal electrocatalysts for oxygen evolution reaction (OER). Nickel‐based selenides have good conductivity and easy to regulate, which make them to be a promising OER electrocatalysts. Hence, many researchers engineering the structure of Nickel‐based selenides to further improve the OER performance. In this paper, NixFe_1‐xSe₂ porous‐nano‐microspheres with different ratio were synthesized. Results confirm that Fe not only affects the number of active sites in NiSe₂, but also affects the intrinsic activity by forming lattice defects. Besides, introduction of Fe can change the redox ability of Ni cation and Se anion, thus, reducing the average valence state of Ni cation in NiOOH. As a result, the current density of OER is improved remarkably. When the current density reaches 10 mA cm⁻², the overpotential is only 285 mV.

中文翻译：

Fe对NiSe2的形态和电子结构的调控，可实现高效的析氧反应。

随着氢能经济的发展，研究人员迫切需要探索用于氧释放反应（OER）的高效非贵金属电催化剂。镍基硒化物具有良好的电导率并且易于调节，使其成为有前途的OER电催化剂。因此，许多研究人员对镍基硒化物的结构进行了工程设计，以进一步提高OER性能。本文合成了不同比例的NixFe _1-x Se ₂多孔纳米微球。结果证实，铁不仅会影响NiSe _2中的活性位点数量，但也会通过形成晶格缺陷来影响固有活性。另外，Fe的引入可以改变Ni阳离子和Se阴离子的氧化还原能力，从而降低NiOOH中Ni阳离子的平均价态。结果，OER的电流密度显着提高。当电流密度达到10 mA cm ^-2时，过电势仅为285 mV。

更新日期：2020-11-17

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