Self-supporting Cu/α-FeOOH/foam nickel composite catalyst for efficient hydrogen production by coupling methanol oxidation and water electrolysis
Self-supporting Cu/α-FeOOH/NF catalysts were prepared by in-situ growth of Cu/α-FeOOH nanocompos-ites on foam nickel(NF)substrate by one-step solvothermal method.Compared with the α-FeOOH/NF catalyst,add-ing Cu provided more attachment sites for the growth of α-FeOOH,which makes the catalyst surface morphology rougher and increases the contact area between the catalyst and reactants.The assembled heterointerface between crystalline Cu and amorphous α-FeOOH altered the electronic structure of the catalyst.It promoted electron transfer from Ni and Fe to Cu,thus enhancing methanol adsorption and oxidation.The electrochemical tests revealed that the Cu/α-FeOOH/NF catalyst exhibited excellent methanol oxidation reaction(MOR)and hydrogen evolution reac-tion(HER)performance.In the Cu/α-FeOOH/NF||Cu/α-FeOOH/NF HER-MOR system,the voltage was reduced by 125 mV compared to the overall water splitting system at the geometric current density of 10 mA·cm-2.The catalytic system operated stably for 96 h under high voltage(2.4 V).In addition,the anode MOR produced value-added for-mate and the calculated Faraday efficiency based on formate was close to 97％under an applied voltage of 1.80 V.
methanol oxidation reactionheterogeneous interfaceself-supporting bifunctional catalystformatecoupling electrolysis of water for hydrogen production
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