Abstract
The electrocatalytic hydrogenation (ECH) of biomass feedstocks has emerged as a conceptually attractive alternative for thermal upgrading bio-oil under mild conditions. Pt, Ru, Pt3Ru, Pt3Sn, Ru3Sn, and Pt3RuSn supported on carbon cloth (CC) are synthesized to explore the ECH performance of phenol to cyclohexanol, respectively. The synergistic effect of bimetallic Pt and Ru promotes the activation of phenyl rings, while adding Sn generates new adsorption sites, entraining an excellent catalytic activity of Pt3RuSn/CC to produce cyclohexanol with almost no cyclohexanone in the whole reaction process, which is verified by density functional theory (DFT) calculation. The reaction rate constant and apparent activation energy show a catalytic performance ranking of Pt3Ru/CC > Pt3RuSn/CC > Pt/CC > Pt3Sn/CC > Ru/CC > Ru3Sn/CC. The kinetic parameters are associated with the results of electrochemical measurements, confirming that there is a linear relationship between the shift degree of linear scan voltammogram (LSV) after adding substrates and the intrinsic catalytic activity. These results open scientific avenues toward the design of electrocatalysts by synergistic polymetallic catalysis and provide an important reference in preliminary screening designed electrocatalysts for biomass upgrading.
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