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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1002/adma.201705324
|2 doi
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|a pubmed24n0933.xml
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|a (DE-627)NLM279899262
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|a (NLM)29327475
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Jiang, Peng
|e verfasserin
|4 aut
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|a Tuning the Activity of Carbon for Electrocatalytic Hydrogen Evolution via an Iridium-Cobalt Alloy Core Encapsulated in Nitrogen-Doped Carbon Cages
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|c 2018
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 01.08.2018
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|a Graphene, a 2D material consisting of a single layer of sp2 -hybridized carbon, exhibits inert activity as an electrocatalyst, while the incorporation of heteroatoms (such as N) into the framework can tune its electronic properties. Because of the different electronegativity between N and C atoms, electrons will transfer from C to N in N-doped graphene nanosheets, changing inert C atoms adjacent to the N-dopants into active sites. Notwithstanding the achieved progress, its intrinsic activity in acidic media is still far from Pt/C. Here, a facile annealing strategy is adopted for Ir-doped metal-organic frameworks to synthesize IrCo nanoalloys encapsulated in N-doped graphene layers. The highly active electrocatalyst, with remarkably reduced Ir loading (1.56 wt%), achieves an ultralow Tafel slope of 23 mV dec-1 and an overpotential of only 24 mV at a current density of 10 mA cm-2 in 0.5 m sulfuric acid solution. Such superior performance is even superior to the noble-metal catalyst Pt. Surface structural and computational studies reveal that the superior behavior originates from the decreased ΔGH* for HER induced by the electrons transferred from the alloy core to the graphene layers, which is beneficial for enhancing CH binding
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|a Journal Article
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|a alloys
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|a charge-density difference
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|a graphene shells
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|a metal-organic frameworks
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|a Chen, Jitang
|e verfasserin
|4 aut
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|a Wang, Changlai
|e verfasserin
|4 aut
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|a Yang, Kang
|e verfasserin
|4 aut
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|a Gong, Shipeng
|e verfasserin
|4 aut
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|a Liu, Shuai
|e verfasserin
|4 aut
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1 |
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|a Lin, Zhiyu
|e verfasserin
|4 aut
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|a Li, Mengsi
|e verfasserin
|4 aut
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|a Xia, Guoliang
|e verfasserin
|4 aut
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|a Yang, Yang
|e verfasserin
|4 aut
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|a Su, Jianwei
|e verfasserin
|4 aut
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|a Chen, Qianwang
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g 30(2018), 9 vom: 20. März
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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|g volume:30
|g year:2018
|g number:9
|g day:20
|g month:03
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|u http://dx.doi.org/10.1002/adma.201705324
|3 Volltext
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|d 30
|j 2018
|e 9
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