科研之友
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摘要
Combining the methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER) within an integrated electrolytic system may offer the advantages of enhanced kinetics of the anode, reduced energy consumption, and the production of high-purity hydrogen. Herein, it is reported the construction of NiMoN nanorod arrays supported on a nickel foam substrate (NiMoN/NF) as a bifunctional electrocatalyst for electrocatalytic hydrogen production and selective methanol oxidation to formate. Remarkably, The optimal NiMoN/NF catalyst displays exceptional HER performance with an overpotential of only 49 mV to attain 10 mA cm-2 in acid, and exhibits a high activity for MOR to achieve 100 mA cm-2 at 1.48 V in alkali. A hybrid acid/base electrolytic cell with NiMoN/NF electrode as anode and cathode is further developed for an integrated HER-MOR cell, which only requires a voltage of 0.56 V at 10 mA cm-2, significantly lower than that of the HER-OER system (0.70 V). The density functional theory studies reveal that the incorporation of Ni effectively modulates the electronic structure of MoN, thereby resulting in enhanced catalytic activity. The unique combination of high electrocatalytic activity and excellent stability make the NiMoN/NF catalyst a promising candidate for practical applications in electrocatalytic hydrogen production and methanol oxidation. @@@ Nanorod catalysts with NiMoN nanoparticles building blocks are developed as a bifunctional catalyst for the acidic hydrogen evolution reaction (HER) and alkaline Methanol Oxidation Reaction (MOR), which can be applied in a hybrid acid/base electrolytic cell that only requires a voltage of only 0.56 V for reach 10 mA cm-2 with simultaneously producing formate and H2.image
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单位中国科学院; 中国科学院福建物质结构研究所; 南昌航空大学
