Accelerating water dissociation kinetics by isolating cobalt atoms into ruthenium lattice.

ABSTRACT: Designing highly active and robust platinum-free catalysts for hydrogen evolution reaction is of vital importance for clean energy applications yet challenging. Here we report highly active and stable cobalt-substituted ruthenium nanosheets for hydrogen evolution, in which cobalt atoms are isolated in ruthenium lattice as revealed by aberration-corrected high-resolution transmission electron microscopy and X-ray absorption fine structure measurement. Impressively, the cobalt-substituted ruthenium nanosheets only need an extremely low overpotential of 13 mV to achieve a current density of 10 mA cm^-2 in 1 M KOH media and an ultralow Tafel slope of 29 mV dec^-1, which exhibit top-level catalytic activity among all reported platinum-free electrocatalysts. The theoretical c

SUBMITTER: Mao J 

PROVIDER: S-EPMC6251903 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature