15August2020

Nano-Micro Letters

Nanoparticle-Decorated Ultrathin La2O3 Nanosheets as An Efficient Electrocatalysis for Oxygen Evolution Reactions

Guangyuan Yan1, 2, Yizhan Wang1, Ziyi Zhang1, Yutao Dong1, Jingyu Wang1, Corey Carlos1, Pu Zhang3, Zhiqiang Cao2, *, Yanchao Mao3, *, Xudong Wang1, *

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Nano-Micro Lett. (2020) 12: 49

First Online: 14 February 2020 (Article)

DOI:10.1007/s40820-020-0387-5

*Corresponding author. E-mail: xudong.wang@wisc.edu (Xudong Wang); caozq@dlut.edu.cn (Zhiqiang Cao); ymao@zzu.edu.cn (Yanchao Mao)

 

Abstract

 


Toc

Electrochemical catalysts for oxygen evolution reaction is a critical component for many renewable energy applications. To improve their catalytic kinetics and mass activity are essential for sustainable industrial applications. Here, we report a rare-earth metal-based oxide electrocatalyst comprised of ultrathin amorphous La2O3 nanosheets hybridized with uniform La2O3 nanoparticles (La2O3@NP-NS). Significantly improved OER performance is observed from the nanosheets with a nanometer-scale thickness. The as-synthesized 2.27-nm La2O3@NP-NS exhibit excellent catalytic kinetics with an overpotential of 310 mV at 10 mA cm-2, a small Tafel slope of 43.1 mV dec-1, and electrochemical impedance of 38 Ω. More importantly, due to the ultrasmall thickness, its mass activity and turnover frequency reach as high as 6,666.7 A g-1 and 5.79 s-1, respectively at an overpotential of 310 mV. Such a high mass activity is more than three orders of magnitude higher than benchmark OER electrocatalysts, such as IrO2 and RuO2. This work presents a sustainable approach toward the development of highly efficient electrocatalysts with largely reduced mass loading of precious elements. 


 

Keywords

Oxygen evolution reaction; Multiphase hybrid; Two-dimensional nanomaterials; Rare earth oxides; Ionic layer epitaxy

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