Hydrogen radical-boosted electrocatalytic CO₂ reduction using Ni-partnered heteroatomic pairs.

ABSTRACT: The electrocatalytic reduction of CO₂ to CO is slowed by the energy cost of the hydrogenation step that yields adsorbed *COOH intermediate. Here, we report a hydrogen radical (H•)-transfer mechanism that aids this hydrogenation step, enabled by constructing Ni-partnered hetero-diatomic pairs, and thereby greatly enhancing CO₂-to-CO conversion kinetics. The partner metal to the Ni (denoted as M) catalyzes the Volmer step of the water/proton reduction to generate adsorbed *H, turning to H•, which reduces CO₂ to carboxyl radicals (•COOH). The Ni partner then subsequently adsorbs the •COOH in an exothermic reaction, negating the usual high energy-penalty for the electrochemical hydrogenation of CO₂. Tuning the H adsorption strength of the M site (wit

SUBMITTER: Yao Z 

PROVIDER: S-EPMC11564623 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature