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

Autor: Guangyuan Yan, Yizhan Wang, Ziyi Zhang, Yutao Dong, Jingyu Wang, Corey Carlos, Pu Zhang, Zhiqiang Cao, Yanchao Mao, Xudong Wang
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Nano-Micro Letters, Vol 12, Iss 1, Pp 1-12 (2020)
Druh dokumentu: article
ISSN: 2311-6706
2150-5551
DOI: 10.1007/s40820-020-0387-5
Popis: Abstract Electrochemical catalysts for oxygen evolution reaction are 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 exhibits 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 6666.7 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.
Databáze: Directory of Open Access Journals
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