Enhanced Electrochemical H2O2 Production via Two-Electron Oxygen Reduction Enabled by Surface-Derived Amorphous Oxygen-Deficient TiO2-x.
Zhaoquan XuJie LiangYuanyuan WangKai DongXifeng ShiQian LiuYonglan LuoTingshuai LiYu JiaAbdullah Mohammed AsiriZhesheng FengYan WangDongwei MaXuping SunPublished in: ACS applied materials & interfaces (2021)
The electrochemical oxygen reduction reaction (ORR) is regarded as an attractive alternative to the anthraquinone process for sustainable and on-site hydrogen peroxide (H2O2) production. It is however hindered by low selectivity due to strong competition from the four-electron ORR and needs efficient catalysts to drive the 2e- ORR. Here, an acid oxidation strategy is proposed as an effective strategy to boost the 2e- ORR activity of metallic TiC via in-site generation of a surface amorphous oxygen-deficient TiO2-x layer. The resulting a-TiO2-x/TiC exhibits a low overpotential and high H2O2 selectivity (94.1% at 0.5 V vs reversible hydrogen electrode (RHE)), and it also demonstrates robust stability with a remarkable productivity of 7.19 mol gcat.-1 h-1 at 0.30 V vs RHE. The electrocatalytic mechanism of a-TiO2-x/TiC is further revealed by density functional theory calculations.
Keyphrases
- hydrogen peroxide
- density functional theory
- visible light
- obsessive compulsive disorder
- quantum dots
- molecular dynamics
- electron transfer
- gold nanoparticles
- nitric oxide
- room temperature
- ionic liquid
- molecularly imprinted
- climate change
- label free
- metal organic framework
- highly efficient
- molecular dynamics simulations
- mass spectrometry
- deep brain stimulation
- high resolution
- electron microscopy
- carbon nanotubes