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Updated: Sep 19, 2025

Experimental Methods for Efficient Solar Hydrogen Production in Microgravity Environment
Published on: December 3, 2019
Oxygen vacancy enhanced local acidic environment toward efficient hydrogen evolution reaction in seawater over
Kun Li1, Shenyue Xu1, Xiaobin Liu1
1Key Laboratory of Eco-chemical Engineering, International Science and Technology Cooperation Base of Eco-chemical Engineering and Green Manufacturing, College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
Abstract:
Hydrogen evolution reaction (HER) in seawater is of great significance, but its efficiency is significantly hindered by the limited activity of electrocatalysts and cathodic precipitation of Ca2+/Mg2+ ions. In this context, Ru/Fe2O3-x catalyst with an abundance of oxygen vacancies is developed to enhance local acidic environments. On the one side, in-situ electrochemical measurements and density functional theory (DFT) calculations have uncovered that the adjustment of hydrogen adsorption energy and electronic structure by oxygen vacancies contributes to construct local acidic environment of H3O+, leading to enhanced HER kinetics and performance. On the other side, the Ru/Fe2O3-x possess exceptional HER stability, lasting over 1000 hours in 1.0 M KOH seawater solution. In addition, by using Ru/Fe2O3-x as cathode, an Na+-mediated asymmetric electrolyzer is assembled for proof of concept of practical applications.
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