Ce-Doped IrO2 Electrocatalysts with Enhanced Performance for Water Oxidation in Acidic Media.
Yahui WangShaoyun HaoXiangnan LiuQiqi WangZhiwei SuLecheng LeiXingwang ZhangPublished in: ACS applied materials & interfaces (2020)
Electrocatalytic water splitting in acidic media based on a proton-exchange membrane (PEM) is a promising technique for the large-scale production of hydrogen. However, developing electrocatalysts with high activity and excellent stability for an oxygen evolution reaction (OER) in acidic media is still a big challenge. Herein, a Cex-IrO2 catalyst supported on N-doped porous carbon (NPC) was developed via doping Ce into IrO2 nanoparticles. The Cex-IrO2 nanoparticles were uniformly distributed on NPC due to the high surface area. The optimized Ce0.2-IrO2@NPC delivers a low overpotential of 224 mV and excellent stability of 100 h in 0.5 M H2SO4 at 10 mA cm-2. Density functional theory (DFT) calculations indicated that the introduction of Ce could modify the electronic structure of IrO2, decreasing the energy barrier of the rate-determining step for OER and enhancing the electrochemical OER performance. Our work opens up a new way of developing anodic electrocatalysts, which can be stably applied in acidic media.
Keyphrases
- density functional theory
- ionic liquid
- metal organic framework
- molecular dynamics
- visible light
- highly efficient
- quantum dots
- energy transfer
- room temperature
- reduced graphene oxide
- electron transfer
- molecular docking
- molecular dynamics simulations
- hydrogen peroxide
- nitric oxide
- mass spectrometry
- carbon dioxide
- neural network
- high resolution
- crystal structure