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The stability of PEM water electrolysers is severely affected by the purity of the water employed. Here a cobalt-doped RuO₂ catalyst is developed to operate with water treated with reverse osmosis, which contains a significant amount of residual ions, achieving a degradation rate of only 10 μV h⁻¹ after 2,000 h of continuous operation at 1 A cm⁻².

Electrolysis of dirty water is an attractive route to clean hydrogen, but fluctuating surface pH quickly ruins electrodes. Here, the authors report an ion-selective polymer gate that steadies surface pH, bars harmful ions and lets seawater-fed cells run 1500 h with pure-water durability.

Hydroxide exchange membrane fuel cells operating in alkaline electrolyte are more cost-effective than their proton exchange membrane counterparts, but their performance is still considerably lower. Now, a Ni–Mo–Nb metallic glass is put forward as a hydrogen oxidation reaction catalyst with high activity and stability in alkaline electrolyte.

Electrosynthesis of acetate from CO using renewable electricity faces low selectivity. Here, the authors report a cerium single atom modulated copper catalyst, where cerium atoms tailor the interfacial water structure, enabling highly selective CO-to-acetate conversion under pulsed electrolysis.

Transition metal dichalcogenides represent an exciting class of earth-abundant hydrogen-from-water electrocatalysts, although low efficiencies limit commercialization. Here, authors present a doping strategy to induce a phase transition in cobalt selenide and boost H₂-evolution performance.

Developing durable catalysts for carbon dioxide reduction to formate at commercial-scale current densities is challenging. This work reports that indium sulfide stabilized through zinc incorporation can produce formate efficiently and quickly at high current densities over long timescales.

The lack of efficient and cost-effective catalysts for H₂ oxidation reaction (HOR) hinders the application of anion exchange membrane fuel cells. Here, authors report a ternary nickel-tungsten-copper nanoalloy with marked HOR activity and stability that rivals the benchmark platinum catalyst.

The lack of efficient and cost-effective catalysts for hydrogen oxidation reaction (HOR) hampers the application of hydroxide exchange membrane fuel cells. Here, authors reported bimetallic MoNi₄ and WNi₄ nanoalloys with marked HOR activity in alkali, among which MoNi4 outperforms the Pt/C catalyst.

Noble-metal-free catalysts often show stability issues in acidic media due to structural degradation. Here authors show that phase-mixed engineering of cobalt diselenide electrocatalysts can enable greater covalency of Co-Se bonds and improve robustness for catalyzing hydrogen evolution in acid.