Hydrogen Spillover-Bridged Volmer/Tafel Processes Enabling Ampere-Level Current Density Alkaline Hydrogen Evolution Reaction under Low Overpotential
Griffith University · East China University of Science and Technology · +1 more institution
Abstract
Water-alkaline electrolysis holds a great promise for industry-scale hydrogen production but is hindered by the lack of enabling hydrogen evolution reaction electrocatalysts to operate at ampere-level current densities under low overpotentials. Here, we report the use of hydrogen spillover-bridged water dissociation/hydrogen formation processes occurring at the synergistically hybridized Ni3S2/Cr2S3 sites to incapacitate the inhibition effect of high-current-density-induced high hydrogen coverage at the water dissociation site and concurrently promote Volmer/Tafel processes. The mechanistic insights critically important to enable ampere-level current density operation are depicted from the experimental and…
Citation impact
- FWCI
- 20.11
- Percentile
- 100%
- References
- 62
Authors
11Topics & keywords
- Tafel equation
- Overpotential
- Chemistry
- Hydrogen
- Dissociation (chemistry)
- Hydrogen spillover
- Exchange current density
- Electrolysis of water