Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 266, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118643
Keywords
Acidic media; Electronic structure; IrO2; Oxygen evolution reaction; Theoretical calculations
Funding
- Zhejiang Provincial Natural Science Foundation of China [LR17B060003]
- Natural Science Foundation of China [21776248, 21676246]
- Fundamental Research Funds for the Central Universities
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The rational design of electrocatalysts with active and long-durable characters applying in acidic proton exchange membrane electrolyzers is a spotlight for the sustainable energy storage. With the aim of tuning electronic structure of electrocatalysts and altering potential limiting step of the oxygen evolution reaction (OER), the ultra-small Pt, La co-doped IrO2 nanoparticles with average size of 2 nm highly dispersed on N-doped carbon (NC) was designed. Impressively, the representative Pt0.1La0.1-IrO2@NC exhibited the record performance toward OER in 0.5 M H2SO4 with a low overpotential of 205 mV (10 mA.cm(-2)), an extremely excellent stability of 135 h, and a fairly high TOF value of 5.71 s(-1) at eta = 280 mV. Theoretical calculations revealed that the co-doping of Pt, La into the lattice of IrO2 could rationally tune d band centers and lower the energy barrier for the potential-determining step (from *O to *OOH) toward OER.
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