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231225s2019 xx |||||o 00| ||eng c |
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|a 10.1002/adma.201808281
|2 doi
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|a pubmed24n0983.xml
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|a (DE-627)NLM294967222
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|a (NLM)30873660
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Han, Xiaopeng
|e verfasserin
|4 aut
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|a Identifying the Activation of Bimetallic Sites in NiCo2 S4 g-C3 N4 -CNT Hybrid Electrocatalysts for Synergistic Oxygen Reduction and Evolution
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|c 2019
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Revised 01.10.2020
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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|a Hybrid materials composed of transition-metal compounds and nitrogen-doped carbonaceous supports are promising electrocatalysts for various electrochemical energy conversion devices, whose activity enhancements can be attributed to the synergistic effect between metallic sites and N dopants. While the functionality of single-metal catalysts is relatively well-understood, the mechanism and synergy of bimetallic systems are less explored. Herein, the design and fabrication of an integrated flexible electrode based on NiCo2 S4 /graphitic carbon nitride/carbon nanotube (NiCo2 S4 g-C3 N4 -CNT) are reported. Comparative studies evidence the electronic transfer from bimetallic Ni/Co active sites to abundant pyridinic-N in underlying g-C3 N4 and the synergistic effect with coupled conductive CNTs for promoting reversible oxygen electrocatalysis. Theoretical calculations demonstrate the unique coactivation of bimetallic Ni/Co atoms by pyridinic-N species (a Ni, Co-N2 moiety), which simultaneously downshifts their d-band center positions and benefits the adsorption/desorption features of oxygen intermediates, accelerating the reaction kinetics. The optimized NiCo2 S4 @g-C3 N4 -CNT hybrid manifests outstanding bifunctional performance for catalyzing oxygen reduction/evolution reactions, highly efficient for realistic zinc-air batteries featuring low overpotential, high efficiency, and long durability, superior to those of physical mixed counterparts and state-of-the-art noble metal catalysts. The identified bimetallic coactivation mechanism will shed light on the rational design and interfacial engineering of hybrid nanomaterials for diverse applications
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|a Journal Article
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|a bimetallic sites
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4 |
|a hybrid electrocatalysts
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|a metal-air batteries
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|a oxygen reduction/evolution
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| 650 |
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|a transition-metal compounds
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1 |
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|a Zhang, Wei
|e verfasserin
|4 aut
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|a Ma, Xiaoya
|e verfasserin
|4 aut
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1 |
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|a Zhong, Cheng
|e verfasserin
|4 aut
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|a Zhao, Naiqin
|e verfasserin
|4 aut
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1 |
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|a Hu, Wenbin
|e verfasserin
|4 aut
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| 700 |
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|a Deng, Yida
|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 31(2019), 18 vom: 23. Mai, Seite e1808281
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
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|g volume:31
|g year:2019
|g number:18
|g day:23
|g month:05
|g pages:e1808281
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|u http://dx.doi.org/10.1002/adma.201808281
|3 Volltext
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