In:
Nano-Micro Letters, Springer Science and Business Media LLC, Vol. 12, No. 1 ( 2020-12)
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 La 2 O 3 nanosheets hybridized with uniform La 2 O 3 nanoparticles (La 2 O 3 @NP-NS). Significantly improved OER performance is observed from the nanosheets with a nanometer-scale thickness. The as-synthesized 2.27-nm La 2 O 3 @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 IrO 2 and RuO 2 . This work presents a sustainable approach toward the development of highly efficient electrocatalysts with largely reduced mass loading of precious elements.
Type of Medium:
Online Resource
ISSN:
2311-6706
,
2150-5551
DOI:
10.1007/s40820-020-0387-5
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2020
detail.hit.zdb_id:
2642093-4
