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The electrocatalytic upgrading of CO₂/CO provides a promising route to produce carbon-neutral alcohols but suffers from product loss to crossover and dilution. Here, the authors report on a CO reduction electrolyzer that recovers over 85% of alcohol without dilution, which is then scaled to 800 cm².

Electroreduction of CO on copper is notable for enabling C–C coupling, but a fundamental understanding of what drives product selectivity is lacking. Here a series of well-defined copper nanocrystals with tunable shape and size are used to control product selectivity, with strain identified as a major factor in n-propanol formation.

Acidic CO₂ electroreduction is carbon efficient but suffers from low energy efficiency and selectivity. Here an interfacial cation matrix is developed to enrich alkali cations and increase the local pH at a Cu–Ag catalyst surface, improving efficiency. A 45% CO₂-to-ethanol Faradaic efficiency and 15% energy efficiency for ethanol production are achieved.

Carbon dioxide (CO₂) electroreduction is a sustainable way to reduce the carbon footprint of producing carbon-based chemicals. This work analyses voltage distributions within CO₂ electrolysers, identifies the sources of inefficiencies and highlights opportunities for system optimization.

Proton-exchange membrane water electrolysers rely on iridium to catalyse their anodic reaction, and while ruthenium is a less costly alternative due to its similar activity, it is not as stable. Now, a hierarchical machine-learning catalyst discovery workflow, termed mixed acceleration, is put forward to predict catalyst synthesis, activity and stability, and identify promising RuO_x-based water oxidation catalysts.

Reactive capture bypasses CO₂ regeneration, enabling efficient CO production but with low Faradaic efficiency. The authors report a Ni–N₃ molecular catalyst that resists amino acid adsorption and promotes efficient CO production in amino-acid systems.

Electrochemical CO_x reduction to multi-carbon products is hindered by low energy efficiency, in part due to sluggish ion transport across charge-selective membranes used in electrolysers. Here the authors use a porous, non-charge-selective separator that enhances ion transport and improves performance for CO electrolysis.

Reactive capture—integrating CO₂ capture and electrochemical valorization—improves energy efficiency by eliminating gas-phase CO₂ desorption. Here, authors design a redox-active polymeric network to boost the direct conversion of captured CO₂ to multicarbon products with CO₂-free gas product stream.

The photocatalytic reforming of plastics into value-added chemicals offers a promising strategy to address environmental challenges while providing significant energy benefits. Here, the authors develop modified carbon nitride with enhanced visible light absorption, effectively anchoring under-coordinated IrN₂O₂ sites to catalyze the oxidation of persistent plastic derivatives.

Tandem electrocatalysts are developed for acidic CO₂ electroreduction. The catalyst contains planar-copper for CO₂ reduction to CO, and a dual-copper-active-site layer for CO reduction to C₂₊ products. An ethanol Faradaic efficiency of 46% and a C₂₊ Faradaic efficiency of 91% are achieved in acidic electrolyte at 150 mA cm⁻².

Enhancing the kinetics and selectivity of CO₂/CO electroreduction towards valuable multi-carbon products poses a scientific challenge and is imperative for practical applicability. Here the authors report that modifying copper catalysts with surface thiol ligands significantly improves acetate selectivity.

While the high concentration of CO₂ in flue gas makes it an attractive feedstock for electrocatalytic production of useful molecules, SO₂ contaminants can poison catalysts. Here the authors report a polymer/catalyst/ionomer heterojunction design with hydrophobic and hydrophilic domains that improves the SO₂ tolerance of a Cu catalyst.