Engineering of the d-Band Center of Perovskite Cobaltite for Enhanced Electrocatalytic Oxygen Evolution.,ChemSusChem

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Engineering of the d-Band Center of Perovskite Cobaltite for Enhanced Electrocatalytic Oxygen Evolution.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-01-21 , DOI: 10.1002/cssc.201903470
Yiqiang Sun ₁ , Zihan Zhao ₁ , Si Wu ₁ , Wenjuan Li ₁ , Bo Wu ₂ , Guangning Liu ₁ , Guozhu Chen ₁ , Bo Xu ₁ , Baotao Kang ₁ , Yue Li ₃ , Cuncheng Li ₁

Affiliation

Great efforts have been made to understand and upgrade the kinetically sluggish oxygen evolution reaction (OER). In this study, a series of V-doped LaCoO3 (V-LCO) OER electrocatalysts with optimized d-band centers are fabricated. When utilized as an electrode for the OER, as-formed LaCo0.8 V0.2 O3 (V-LCO-II) requires an overpotential of only 306 mV to drive a geometrical catalytic current density of 10 mA cm-2 . Furthermore, at a given overpotential of 350 mV, the OER current density of V-LCO-II is about 22 times that of pure LaCoO3 (LCO) nanoparticles. Tailoring of the d-band center by V doping facilitates the adsorption of OER intermediates and promotes the formation of amorphous active species on the surface of LCO through the exchange interaction between high-spin V4+ and low-spin Co2+ . This work may create new opportunities for developing other highly active OER catalysts through d-band center engineering.

中文翻译：

钙钛矿钴矿的d波段中心工程，可增强电催化氧的释放。

为了理解和升级动力学迟缓的放氧反应（OER），已经做出了巨大的努力。在这项研究中，制造了一系列具有优化的d波段中心的V掺杂LaCoO3（V-LCO）OER电催化剂。当用作OER的电极时，形成的LaCo0.8 V0.2 O3（V-LCO-II）仅需306 mV的过电势即可驱动10 mA cm-2的几何催化电流密度。此外，在给定的350 mV超电势下，V-LCO-II的OER电流密度约为纯LaCoO3（LCO）纳米颗粒的22倍。通过V掺杂定制d波段中心，可促进OER中间体的吸附，并通过高自旋V4 +和低自旋Co2 +之间的交换相互作用促进LCO表面上非晶态活性物质的形成。

更新日期：2020-01-21

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