Related Experiment Video
Updated: Jun 4, 2026

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
Published on: August 17, 2019
Customized O─O Radical Coupling Route on High-Density Fe─N─C Catalysts for Stable Industrial-Scale Water Oxidation
Zhiang Hu1, Jiangwei Chang1, Jingkun Yu1
1College of Chemistry and Pingyuan Laboratory, Zhengzhou University, Zhengzhou, P. R. China.
Abstract:
Low-cost, efficient, and durable oxygen evolution reaction (OER) catalysts are essential for advancing large-scale hydrogen production via anion-exchange membrane water electrolysis. However, current state-of-the-art catalysts are hindered by insufficient operational stability at high current densities and a lack of precise control over reaction pathways under dynamic operating conditions. In this work, theoretical calculations reveal a continuous regulatory effect of Fe site density on the adsorption energies of key OER intermediates on Fe─N─C single-atom catalysts. Experimental results further demonstrate that by progressively increasing the Fe site density, the surface *OH coverage can be finely tuned, enabling a controllable switch of the OER mechanism from an adsorption evolution mechanism to an oxide pathway mechanism (OPM). A high-density Fe─N─C catalyst (HDFe-N-C, Fe loading 14.7 wt.%) following OPM exhibits remarkable electrochemical stability, operating continuously for 2000 h at 500 mA cm-2 with a low overpotential of 288 mV. When integrated into an anion-exchange membrane electrolyzer, the device achieves 5 A cm-2 at only 2.15 V and maintains stable performance for 500 h.
Related Concept Videos
Heterogeneous Catalysis
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the surface of...
Oxidative Cleavage of Alkenes: Ozonolysis
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Catalysis
Catalysis
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
