Electrochemical hydrogenation(ECH)of biomass-derived platform molecules is a burgeoning route for the sustainable utilization of hydrogen.However,the noble-metal-catalyzed ECH of phenolic compounds suffers from intens...Electrochemical hydrogenation(ECH)of biomass-derived platform molecules is a burgeoning route for the sustainable utilization of hydrogen.However,the noble-metal-catalyzed ECH of phenolic compounds suffers from intense competition with hydrogen evolution reaction.We prepared Pt Rh bimetallic nanoparticles dispersed on highly ordered mesoporous carbon nanospheres,which improves the utilization efficiency of adsorbed hydrogen(H_(ad))to ECH in H-UPD region(>0 V vs.RHE).Further analysis reveals(i)the strong overlapping between the d-orbitals of Pt and Rh enhances specific adsorption of phenol;(ii)incorporation of Rh devotes an electronic effect on weakening the alloy-H_(ad)interaction to increase the FE of ECH.DFT calculations confirm the selectivity difference and the ECH parallel pathways:cyclohexanol and cyclohexanone are formed via hydrogenation/dehydrogenation of the intermediate ^(*)C_(6)H_(10) OH.These findings deepen our fundamental understanding of the ECH process,and cast new light on exploration of highly efficient electrocatalysts for biomass upgrading.展开更多
基金supported by the National Key R&D Program of China(2020YFA0710000)the National Natural Science Foundation of China(21902047,21825201,U19A2017,21972164)the Natural Science Foundation of Hunan Province(2020JJ5045)XAS measurements were performed on the XAS beamlines of Australian Synchrotron,Victoria,Australia,part of ANSTO(under project 21805080,22075075,2020JJ5044)。
文摘Electrochemical hydrogenation(ECH)of biomass-derived platform molecules is a burgeoning route for the sustainable utilization of hydrogen.However,the noble-metal-catalyzed ECH of phenolic compounds suffers from intense competition with hydrogen evolution reaction.We prepared Pt Rh bimetallic nanoparticles dispersed on highly ordered mesoporous carbon nanospheres,which improves the utilization efficiency of adsorbed hydrogen(H_(ad))to ECH in H-UPD region(>0 V vs.RHE).Further analysis reveals(i)the strong overlapping between the d-orbitals of Pt and Rh enhances specific adsorption of phenol;(ii)incorporation of Rh devotes an electronic effect on weakening the alloy-H_(ad)interaction to increase the FE of ECH.DFT calculations confirm the selectivity difference and the ECH parallel pathways:cyclohexanol and cyclohexanone are formed via hydrogenation/dehydrogenation of the intermediate ^(*)C_(6)H_(10) OH.These findings deepen our fundamental understanding of the ECH process,and cast new light on exploration of highly efficient electrocatalysts for biomass upgrading.
