MoS2 is a promising candidate for catalyzing hydrogen evolution reaction (HER) due to its low cost and high activity. However, the poor conductivity and the stack of active sites of bulk MoS2 hinder its application. H...MoS2 is a promising candidate for catalyzing hydrogen evolution reaction (HER) due to its low cost and high activity. However, the poor conductivity and the stack of active sites of bulk MoS2 hinder its application. Herein, a new facile solid-state synthesis strategy was developed to fabricate MoS2 nanorods by one-step pyrolysis of molybdenum-organic framework (Mo-MOF) in the presence of thiourea. The obtained MoS2 keeps the Mo-MOF nanorod structure with more active sites, while the residual carbon left in the nanorod enhances the conductivity. The as-prepared MoS2 nanorods exhibit superior stability and excellent activity towards HER with a small onset potential of 96 mV and a low Tafel slope of 93 mV decade^-1.展开更多
Helical metal-organic frameworks(MOFs)were used as templates or precursors to fabricate helical carbon nanorods(HCNRs)for the first time.Helical carbon contains many topological defects such as pentagonal or heptagona...Helical metal-organic frameworks(MOFs)were used as templates or precursors to fabricate helical carbon nanorods(HCNRs)for the first time.Helical carbon contains many topological defects such as pentagonal or heptagonal carbons,which have the potential to facilitate oxygen reduction reactions(ORR).HCNRs show more positive onset/halfwave reduction potentials and higher limited current density than straight carbon nanorods(SCNRs).They also exhibit four-electron oxygen reduction in tests of ORR,while the alternative SCNRs prefer a two-electron reduction mechanism.Experimental and theoretical studies reveal that these enhanced ORR activities can be attributed to pentagon/heptagon defects in HCNRs.This work provides an effective strategy to synthesize helical,defect-rich carbon materials and opens up a new perspective for utilization of a spiral effect for the development of more effective electrocatalysts.展开更多
基金the financial support from the National Key Research and Development Program of China (2017YFA0700100 and 2018YFA0208600)Strategic Priority Research Program of the Chinese Academy of Sciences (XDB20000000)+2 种基金National Natural Science Foundation of China (21671188, 21871263 and 21331006)Key Research Program of Frontier Science, CAS (QYZDJSSW-SLH045)Youth Innovation Promotion Association, CAS (2014265)
文摘MoS2 is a promising candidate for catalyzing hydrogen evolution reaction (HER) due to its low cost and high activity. However, the poor conductivity and the stack of active sites of bulk MoS2 hinder its application. Herein, a new facile solid-state synthesis strategy was developed to fabricate MoS2 nanorods by one-step pyrolysis of molybdenum-organic framework (Mo-MOF) in the presence of thiourea. The obtained MoS2 keeps the Mo-MOF nanorod structure with more active sites, while the residual carbon left in the nanorod enhances the conductivity. The as-prepared MoS2 nanorods exhibit superior stability and excellent activity towards HER with a small onset potential of 96 mV and a low Tafel slope of 93 mV decade^-1.
基金financial support from the National Key Research and Development Program of China(2018YFA0208600 and 2017YFA0700100)the Key Research Program of Frontier Science,CAS(QYZDJ-SSW-SLH045)+2 种基金the National Natural Science Foundation of China(21671188,21871263 and 22033008)the Strategic Priority Research Program of CAS(XDB20000000)the Youth Innovation Promotion Association,CAS(2014265)。
文摘Helical metal-organic frameworks(MOFs)were used as templates or precursors to fabricate helical carbon nanorods(HCNRs)for the first time.Helical carbon contains many topological defects such as pentagonal or heptagonal carbons,which have the potential to facilitate oxygen reduction reactions(ORR).HCNRs show more positive onset/halfwave reduction potentials and higher limited current density than straight carbon nanorods(SCNRs).They also exhibit four-electron oxygen reduction in tests of ORR,while the alternative SCNRs prefer a two-electron reduction mechanism.Experimental and theoretical studies reveal that these enhanced ORR activities can be attributed to pentagon/heptagon defects in HCNRs.This work provides an effective strategy to synthesize helical,defect-rich carbon materials and opens up a new perspective for utilization of a spiral effect for the development of more effective electrocatalysts.
