摘要
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.
目前螺旋碳纳米材料作为催化电化学反应的催化剂的研究较少.螺旋碳纳米结构对电催化性能的影响更是不明确.本文首次报导以螺旋状的金属有机框架化合物为模板高温热解制备螺旋碳纳米棒.该螺旋碳纳米棒在电催化氧还原反应中展现出比普通碳纳米棒高的催化性能.本文提出了一个制备螺旋碳纳米棒的简易有效的方法,并为利用螺旋效应设计高效电催化剂提供了新思路.
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)
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)。
