Efficient Electromethanation from CO₂ on Monodisperse Cu-Based Catalysts

Abstract

The electrochemical CO 2 reduction reaction (CO 2 RR) is a promising approach to upgrading CO 2 into methane (CH 4 ) and other high-value-added chemicals, critical for lowering carbon emissions and mitigating the greenhouse effect. However, the selectivity of CO 2 RR to methane remains low at the current densities required for commercialization. Herein, we report a simple one-step synthesis of monodisperse copper-based catalysts for efficient electromethanation of CO 2 . Through rational regulation of active sites, the selectivity for methane production can reach as high as 57.02% under the current density of 300 mA cm −2 as a result of suppressed C−C coupling for improved *CO hydrogenation. This work offers an effective strategy to regulate Cu-based catalysts to manage the hydrogenation of *CO for CO 2 RR toward CH 4 formation.

Electrocatalytic and Photocatalytic CO2 Methanation: From Reaction Fundamentals to Catalyst Developments

“…[64] Sun et al prepared honeycomb Cu electrocatalysts using the dicyandiamide solvothermal method, in which monodispersed Cu active sites facilitated *CO hydrogenation and hence methane generation, obtaining the CH 4 selectivity of 57.0 % at 300 mA • cm À 2 . [65] Graphene [66] and nitrogen-doped graphene quantum dots electrocatalysts [67] can also be synthesized using the hydrothermal method, and the content of electron-donating groups on the catalyst surface can be adjusted by the type of nitrogen-containing additive, which facilitates the conversion of CO 2 to methane.…”

Customizing pyridinic nitrogen coordination in Ni–N–C for electrocatalytic CO2 reduction towards CO

“…The electrocatalytic carbon dioxide reduction reaction (CO 2 RR) to achieve artificial carbon cycle is a green and environmentally friendly development trend, which involves multiproton-electron coupling process [5][6][7]. There are different reduction products such as C 1 , C 2 and C 2+ product [8][9][10][11][12][13][14][15][16][17][18]. Among them, carbon monoxide (CO), as an ideal product, is used to produce a variety of chemical products in industry [19,20].…”