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Engineering a local acid-like environment in alkaline medium for efficient hydrogen evolution reaction
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Journal Article
Engineering a local acid-like environment in alkaline medium for efficient hydrogen evolution reaction
2022
Overview
Tuning the local reaction environment is an important and challenging issue for determining electrochemical performances. Herein, we propose a strategy of intentionally engineering the local reaction environment to yield highly active catalysts. Taking Pt
δ−
nanoparticles supported on oxygen vacancy enriched MgO nanosheets as a prototypical example, we have successfully created a local acid-like environment in the alkaline medium and achieve excellent hydrogen evolution reaction performances. The local acid-like environment is evidenced by operando Raman, synchrotron radiation infrared and X-ray absorption spectroscopy that observes a key H
3
O
+
intermediate emergence on the surface of MgO and accumulation around Pt
δ−
sites during electrocatalysis. Further analysis confirms that the critical factors of the forming the local acid-like environment include: the oxygen vacancy enriched MgO facilitates H
2
O dissociation to generate H
3
O
+
species; the F centers of MgO transfers its unpaired electrons to Pt, leading to the formation of electron-enriched Pt
δ−
species; positively charged H
3
O
+
migrates to negatively charged Pt
δ−
and accumulates around Pt
δ−
nanoparticles due to the electrostatic attraction, thus creating a local acidic environment in the alkaline medium.
While catalysts have intrinsic activities toward reactions, such performances often require further optimization. Here, authors engineer an acid-like environment in alkaline media by fine-tuning the reaction environment of platinum nanoparticles on oxide nanosheets for H
2
evolution electrocatalysis.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
