Anomalous hydrogen evolution behavior in high-pH environment induced by locally generated hydronium ions.

ABSTRACT: Most fundamental studies of electrocatalysis are based on the experimental and simulation results obtained for bulk model materials. Some of these mechanistic understandings are inapplicable for more active nanostructured electrocatalysts. Herein, considering the simplest and most typical electrocatalytic process, the hydrogen evolution reaction, an alternative reaction mechanism is proposed for nanomaterials based on the identification of a new intermediate, which differs from those commonly known for the bulk counterparts. In-situ Raman spectroscopy and electrochemical thermal/kinetic measurements were conducted on a series of nanomaterials under different conditions. In high-pH electrolytes with negligible hydronium (H₃O⁺) concentration in bulk phase, massive H

SUBMITTER: Wang X 

PROVIDER: S-EPMC6814866 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature