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In this work, monodisperse core/shell Cu/In2O3nanoparticles (NPs) were developed to boost efficient and tunable syngas formation via electrochemical CO2reduction for the first time. The efficiency and composition of syngas production on the developed carbon-supported Cu/In2O3catalysts are highly dependent on the In2O3shell thickness (0.4–1.5 nm). As a result, a wide H2/CO ratio (4/1 to 0.4/1) was achieved on the Cu/In2O3catalysts by controlling the shell thickness and the applied potential (from −0.4 to −0.9 V vs reversible hydrogen electrode), with Faraday efficiency of syngas formation larger than 90%. Specifically, the best-performing Cu/In2O3catalyst demonstrates remarkably large current densities under low overpotentials (4.6 and 12.7 mA/cm2at −0.6 and −0.9 V, respectively), which are competitive with most of the reported systems for syngas formation. Mechanistic discussion implicates that the synergistic effect between lattice compression and Cu doping in the In2O3shell may enhance the binding of *COOH on the Cu/In2O3NP surface, leading to the enhanced CO generation relative to Cu and In2O3catalysts. This report demonstrates a new strategy to realize efficient and tunable syngas formation via rationally designed core/shell catalyst configuration.

Molybdenum sulfides are considered to be one kind of the promising candidates as cheap and efficient electrocatalysts for hydrogen evolution reaction (HER). But this is still a gap on electrocatalytic performance toward Pt. To further enhance electrocatalytic activity of molybdenum sulfides, in this work, we prepared Mo3S13films with high ratio of sulfur to molybdenum by electrodeposition. The Mo3S13films exhibit highly efficient electrocatalytic activity for HER and achieve a current density of 10 mA/cm2at an overpotential of 200 mV with an onset potential of 130 mV vs RHE and a Tafel slope of 37 mV/dec, which is superior to other reported MoS2films. The highly electrocatalytic activity is attributed to high percentage of bridging S22–and apical S2–as well as good conductivity. This study provides an avenue for designing new molybdenum sulfides electrocatalysts.