The development of highly selective, low cost, and energy-efficient electrocatalysts is crucial for CO2 electrocatalysis to mitigate energy shortages and to lower the global carbon footprint. Herein, we first report that carbon-coated Ni nanoparticles supported on N-doped carbon enable efficient electroreduction of CO2 to CO. In contrast to most previously reported Ni metal catalysts that resulted in severe hydrogen evolution during CO2 conversion, the Ni particle catalyst here presents an unprecedented CO faradaic efficiency of approximately 94% at an overpotential of 0.59 V, even comparable to that of the best single Ni sites. The catalyst also affords a high CO partial current density and a large CO turnover frequency, reaching 22.7 mA cm−2 and 697 h−1 at −1.1 V (versus the reversible hydrogen electrode), respectively. Experiments combined with density functional theory calculations showed that the carbon layer coated on Ni and N-dopants in carbon material both play important roles in improving catalytic activity for electrochemical CO2 reduction to CO by stabilizing *COOH without affecting the easy *CO desorption ability of the catalyst.

By utilizing the synergistic interaction between CuO and CeO₂, the stabilization of Cu⁺species at a metal–oxide interface is realized. H₂production is considerably suppressed, resulting in enhanced ethylene production with a high FE of 50.0%.

We report ambient electrochemical N ₂ fixation at low overpotentials by using a metal-free catalyst, two-dimensional β-boron.

Photochemical ammonia production under ambient conditions remains a grand challenge. Here we demonstrate efficient visible-light fixation of N₂ to NH₃ in water using novel two-dimensional (2D) Sb/TiO₂ nanocomposites. Such hybrids afford a remarkable NH₃ formation rate of about 20.8 μmol h⁻¹ g_cat. ⁻¹, showing promise as photochemical materials for sustainable NH₃ production.