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Zinc-Mediated Template Synthesis of Fe-N-C Electrocatalysts with Densely Accessible Fe-N-x Active Sites for Efficient Oxygen Reduction
Chen, GB; Liu, P; Liao, ZQ; Sun, FF; He, YH; Zhong, HX; Zhang, T; Zschech, E; Chen, MW; Wu, G; Zhang, J; Feng, XL
2020
Source PublicationADVANCED MATERIALS
ISSN0935-9648
Volume32Issue:8Pages:-
Subtype期刊论文
AbstractOwing to their earth abundance, high atom utilization, and excellent activity, single iron atoms dispersed on nitrogen-doped carbons (Fe-N-C) have emerged as appealing alternatives to noble-metal platinum (Pt) for catalyzing the oxygen reduction reaction (ORR). However, the ORR activity of current Fe-N-C is seriously limited by the low density and inferior exposure of active Fe-N-x species. Here, a novel zinc-mediated template synthesis strategy is demonstrated for constructing densely exposed Fe-N-x moieties on hierarchically porous carbon (SA-Fe-NHPC). During the thermal treatment of 2,6-diaminopyridine/ZnFe/SiO2 complex, the zinc prevents the formation of iron carbide nanoparticles and the SiO2 template promotes the generation of hierarchically pores for substantially improving the accessibility of Fe-N-x moieties after subsequent leaching. As a result, the SA-Fe-NHPC electrocatalysts exhibit an unprecedentedly high ORR activity with a half-wave potential (E-1/2) of 0.93 V in a 0.1 m KOH aqueous solution, which outperforms those for Pt/C catalyst and state-of-the-art noble metal-free electrocatalysts. As the air electrode in zinc-air batteries, the SA-Fe-NHPC demonstrates a large peak power density of 266.4 mW cm(-2) and superior long-term stability. Therefore, the developed zinc-mediated template synthesis strategy for boosting the density and accessibility of Fe-N-x species paves a new avenue toward high-performance ORR electrocatalysts.
KeywordMETAL-ORGANIC FRAMEWORKS POROUS CARBONS FREE CATALYSTS IRON IDENTIFICATION ALKALINE ORR
DOI10.1002/adma.201907399
Indexed BySCI
Language英语
Citation statistics
Cited Times:106[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/33272
Collection中科院上海应用物理研究所2011-2020年
Affiliation1.Tech Univ Dresden, Ctr Advancing Elect Dresden Cfaed, D-01062 Dresden, Germany
2.Tech Univ Dresden, Fac Chem & Food Chem, D-01062 Dresden, Germany
3.Shanghai Jiao Tong Univ, Sch Chem & Chem Engn, Shanghai 200230, Peoples R China
4.Fraunhofer Inst Ceram Technol & Syst IKTS, D-01109 Dresden, Germany
5.Chinese Acad Sci, Shanghai Synchrotron Radiat Facil, Shanghai Inst Appl Phys, Shanghai 201204, Peoples R China
6.Univ Buffalo State Univ New York, Dept Chem & Biol Engn, Buffalo, NY 14260 USA
7.Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA
8.Northwestern Polytech Univ, Dept Appl Chem, Sch Appl & Nat Sci, Xian 710129, Peoples R China
Recommended Citation
GB/T 7714
Chen, GB,Liu, P,Liao, ZQ,et al. Zinc-Mediated Template Synthesis of Fe-N-C Electrocatalysts with Densely Accessible Fe-N-x Active Sites for Efficient Oxygen Reduction[J]. ADVANCED MATERIALS,2020,32(8):-.
APA Chen, GB.,Liu, P.,Liao, ZQ.,Sun, FF.,He, YH.,...&Feng, XL.(2020).Zinc-Mediated Template Synthesis of Fe-N-C Electrocatalysts with Densely Accessible Fe-N-x Active Sites for Efficient Oxygen Reduction.ADVANCED MATERIALS,32(8),-.
MLA Chen, GB,et al."Zinc-Mediated Template Synthesis of Fe-N-C Electrocatalysts with Densely Accessible Fe-N-x Active Sites for Efficient Oxygen Reduction".ADVANCED MATERIALS 32.8(2020):-.
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