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Interfacial Structure of Water as a New Descriptor of the Hydrogen Evolution Reaction
- Source :
- Angewandte Chemie. 132:22583-22588
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- Driven by the persisting poor understanding of the sluggish kinetics of the hydrogen evolution reaction (HER) on Pt in alkaline media, a direct correlation of the interfacial water structure and activity is still yet to be established. Herein, using Pt and Pt-Ni nanoparticles we first demonstrate a strong dependence of the proton donor structure on the HER activity and pH. The structure of the first layer changes from the proton acceptors to the donors with increasing pH. In the base, the reactivity of the interfacial water varied its structure, and the activation energies of water dissociation increased in the sequence: the dangling O-H bonds < the trihedrally coordinated water < the tetrahedrally coordinated water. Moreover, optimizing the adsorption of H and OH intermediates can re-orientate the interfacial water molecules with their H atoms pointing towards the electrode surface, thereby enhancing the kinetics of HER. Our results clarified the dynamic role of the water structure at the electrode-electrolyte interface during HER and the design of highly efficient HER catalysts.
- Subjects :
- 010405 organic chemistry
Chemistry
Kinetics
Nanoparticle
General Chemistry
General Medicine
010402 general chemistry
Photochemistry
01 natural sciences
Catalysis
Dissociation (chemistry)
0104 chemical sciences
symbols.namesake
Adsorption
symbols
Molecule
Fourier transform infrared spectroscopy
Raman spectroscopy
Subjects
Details
- ISSN :
- 15213757 and 00448249
- Volume :
- 132
- Database :
- OpenAIRE
- Journal :
- Angewandte Chemie
- Accession number :
- edsair.doi.dedup.....5a89ad04c66e429d600f2f7132d650e2