Bing Chang,Xia-Guang Zhang,Zhaojun Min,Weiwei Lu,Zhiyong Li,Jikuan Qiu,Huiyong Wang,Jing Fan,Jianji Wang
Electrochemical conversion of CO2 into syngas (CO and H2) has attracted extensive research studies because it is a promising pathway to produce liquid fuels and industrial chemicals. However, to achieve a high current density at a desired CO/H2 ratio is still a great challenge although it is extremely important in practical applications. In this work, we developed a partially reduced Cu3P nanowire (R-Cu3P/Cu) by selective phosphating to catalyze the CO2-to-syngas conversion. It is found that R-Cu3P/Cu is highly effective for the conversion with a wide tunable range of the CO/H2 ratio (0.1–2.24) and high faradaic efficiency (FE, >93%). More importantly, this catalyst exhibits a record current density of 115 and 82.9 mA cm−2 at the CO/H2 ratio of 2/5 and 1/2, which are precisely required for Fischer–Tropsch synthesis. Mechanism studies reveal that the effective charge transfer from Cu to P on the partial phosphorus vacancy surface makes Cu3P nanostructures exhibit remarkable activity and selectivity for CO2 reduction by a diatomic activating bimolecular mechanism.
Cui Lu,Jianying Wang,Steffen Czioska,Huan Dong,Zuofeng Chen
We report here the fabrication of CuO nanowires and their use as efficient electrocatalyst for the oxygen evolution reaction (OER) or as precursor for preparation of Cu3P nanowires for the hydrogen evolution reaction (HER). The surface-bound Cu(OH)2 nanowires are in situ grown on a three-dimensional copper foam (CF) by anodic treatment, which are then converted to CuO nanowires by calcination in air. The direct growth of nanowires from the underlying conductive substrate can eliminate the use of any conductive agents and binders, which ensures good electrical contact between the electrocatalyst and the conductive substrate. The hierarchically nanostructured Cu-based electrode exhibits excellent catalytic performance toward OER in 1 M KOH solution. Phosphorization of the CuO/CF electrode generates the Cu3P/CF electrode, which can act as an excellent electrocatalyst for HER in 1 M KOH. An alkaline electrolyzer is constructed using CuO and Cu3P nanowires coated copper foams as anode and cathode, which can realize overall water splitting with a current density of 102 mA/cm2 at an applied cell voltage of 2.2 V.
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