Controllable Phase Separation Engineering of Iron-Cobalt Alloy Heterojunction for Efficient Water Oxidation.
Yanhong DingXiaotong HanQian YangYan JinGang BaiJianping ZhangWeihua LiBaoshan HuPublished in: The journal of physical chemistry letters (2024)
The tailor-made transition metal alloy-based heterojunctions hold a promising prospect for the electrocatalytic oxygen evolution reaction (OER). Herein, a series of iron-cobalt bimetallic alloy heterojunctions are purposely designed and constructed via a newly developed controllable phase separation engineering strategy. The results show that the phase separation process and alloy component distribution rely on the metal molar ratio (Fe/Co), indicative of the metal content dependent behavior. Theoretical calculations demonstrate that the electronic structure and charge distribution of iron-cobalt bimetallic alloy can be modulated and optimized, thus leading to the formation of an electron-rich interface layer, which likely tunes the d -band center and reduces the adsorption energy barrier toward electrocatalytic intermediates. As a result, the Fe 0.25 Co 0.75 /Co heterojunction exhibits superior OER activity with a low overpotential of 185 mV at 10 mA cm -2 . Moreover, it can reach industrial-level current densities and excellent durability in high-temperature and high-concentration electrolyte (30 wt % KOH), exhibiting enormous potential for industrial applications.
Keyphrases
- metal organic framework
- reduced graphene oxide
- wastewater treatment
- solar cells
- high temperature
- transition metal
- visible light
- heavy metals
- iron deficiency
- molecular dynamics
- aqueous solution
- gold nanoparticles
- molecular dynamics simulations
- ionic liquid
- nitric oxide
- risk assessment
- hydrogen peroxide
- density functional theory
- carbon nanotubes
- electron transfer
- climate change
- perovskite solar cells
- human health