General overview of PEM electrolyzer and research status of key materials (e.g., membrane, electrocatalysts, gas diffusion layer and bipolar plate) are summarized. The degradation mechanisms under a real operating environment and future directions for developing PEM electrolyzer are discussed.

The fundamental understanding and rational manipulation of catalytic site preference at extended solid surfaces is crucial in the search for advanced catalysts.Herein we find that the Ru top sites at metallic ruthenium surface have efficient Ptlike activity for the hydrogen evolution reaction (HER), but they are subordinate to their adjacent, less active Ru 3 -hollow sites due to the stronger hydrogen-binding ability of the latter. We also present an interstitial incorporation strategy for the promotion of the Ru top sites from subordinate to dominant character,w hile maintaining Pt-like catalytic activity.O ur combined theoretical and experimental studies further identify intermetallic RuSi as ah ighly active,n on-Pt material for catalyzing the HER, because of its suitable electronic structure governed by ag ood balance of ligand and strain effects.

No abstract

Coupling renewable electricity with proton exchange membrane water electrolysis (PEMWE) technology to generate decarbonized “green hydrogen” is a key route for the international “carbon neutrality” target. Large-scale application of PEMWE...

No abstract