Conversion of carbon dioxide (CO2) to valuable chemicals and feedstocks through electrochemical reduction holds promise for achieving carbon neutrality and mitigating global warming. C2+ products are of interest due to their higher economic value. Since the CO2 to C2+ conversion process involves multiple steps, tandem catalytic strategies are commonly employed in the design of electrochemical CO2 reduction reaction (CO2RR) catalysts and systems/reactors. Among the diverse catalysts that are capable of reducing CO2 to CO, Cu stands out for more efficiently further converting CO to C2+ products. In this review, the emerging Cu-based tandem catalysts and their impact on CO2RR performance, focusing on three positional relationships are summarized. It delves into the integration of tandem catalytic strategies into membrane electrolyzers, utilizing catalyst-coated substrate (CCS) and catalyst-coated membrane (CCM) technologies. Several typical examples are presented to illustrate this integr
Abstract
Electrochemical carbon dioxide (CO ) reduction reaction (CO RR) is an attractive approach to deal with the emission of CO and to produce valuable fuels and chemicals in a carbon-neutral way. Many efforts have been devoted to boost the activity and selectivity of high-value multicarbon products (C ) on Cu-based electrocatalysts. However, Cu-based CO RR electrocatalysts suffer from poor catalytic stability mainly due to the structural degradation and loss of active species under CO RR condition. To date, most reported Cu-based electrocatalysts present stabilities over dozens of hours, which limits the advance of Cu-based electrocatalysts for CO RR. Herein, a porous chlorine-doped Cu electrocatalyst exhibits high C Faradaic efficiency (FE) of 53.8 % at −1.00 V versus reversible hydrogen electrode (V ). Importantly, the catalyst exhibited an outstanding catalytic stability in long-term electrocatalysis over 240 h. Experimental results show that the chlorine-induced stable c