In situ templating synthesis of mesoporous Ni-Fe electrocatalyst for oxygen evolution reaction.

ABSTRACT: Low-cost and efficient electrocatalysts with high dispersion of active sites and high conductivity are of high importance for oxygen evolution reaction (OER). Herein, we use amorphous mesoporous fumed silica (MFS) as a skeleton material to disperse Ni²⁺ and Fe³⁺ through a simple impregnation strategy. The MFS is in situ etched away during the OER process in 1 M KOH to prepare a stable mesoporous Ni-Fe electrocatalyst. The high specific surface area and abundant surface silanol groups in the mesoporous fumed silica afford rich anchor sites for fixing metal atoms via strong chemical metal-oxygen interactions. Raman and XPS investigations reveal that Ni²⁺ formed covalent bonds with surface Si-OH groups, and Fe³⁺ inserted into the frame

SUBMITTER: Wang Y 

PROVIDER: S-EPMC9059140 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature