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Article: Mussel-inspired one-pot synthesis of transition metal and nitrogen co-doped carbon (M/N-C) as efficient oxygen catalysts for Zn-air batteries

TitleMussel-inspired one-pot synthesis of transition metal and nitrogen co-doped carbon (M/N-C) as efficient oxygen catalysts for Zn-air batteries
Authors
Issue Date2016
Citation
Nanoscale, 2016, v. 8, n. 9, p. 5067-5075 How to Cite?
Abstract© The Royal Society of Chemistry 2016.Transition metal and nitrogen co-doping into carbon is an effective approach to promote the catalytic activities towards the oxygen reduction reaction (ORR) and/or oxygen evolution reaction (OER) in the resultant electrocatalysts, M/N-C. The preparation of such catalysts, however, is often complicated and in low yield. Herein we report a robust approach for easy synthesis of M/N-C hybrids in high yield, which includes a mussel-inspired polymerization reaction at room temperature and a subsequent carbonization process. With the introduction of selected transition metal salts into an aqueous solution of dopamine (DA), the obtained mixture self-polymerizes to form metal-containing polydopamine (M-PDA) composites, e.g. Co-PDA, Ni-PDA and Fe-PDA. Upon carbonization at elevated temperatures, these metal-containing composites were converted into M/N-C, i.e. Co-PDA-C, Ni-PDA-C and Fe-PDA-C, respectively, whose morphologies, chemical compositions, and electrochemical performances were fully studied. Enhanced ORR activities were found in all the obtained hybrids, with Co-PDA-C standing out as the most promising catalyst with excellent stability and catalytic activities towards both ORR and OER. This was further proven in Zn-air batteries (ZnABs) in terms of discharge voltage stability and cycling performance. At a discharge-charge current density of 2 mA cm-2 and 1 h per cycle, the Co-PDA-C based ZnABs were able to steadily cycle up to 500 cycles with only a small increase in the discharge-charge voltage gap which notably outperformed Pt/C; at a discharge current density of 5 mA cm-2, the battery continuously discharged for more than 540 h with the discharge voltage above 1 V and a voltage drop rate of merely 0.37 mV h-1. With the simplicity and scalability of the synthetic approach and remarkable battery performances, the Co-PDA-C hybrid catalyst is anticipated to play an important role in practical ZnABs.
Persistent Identifierhttp://hdl.handle.net/10722/237522
ISSN
2020 Impact Factor: 7.79
2020 SCImago Journal Rankings: 2.038
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLi, Bing-
dc.contributor.authorChen, Ye-
dc.contributor.authorGe, Xiaoming-
dc.contributor.authorChai, Jianwei-
dc.contributor.authorZhang, Xiao-
dc.contributor.authorHor, T. S Andy-
dc.contributor.authorDu, Guojun-
dc.contributor.authorLiu, Zhaolin-
dc.contributor.authorZhang, Hua-
dc.contributor.authorZong, Yun-
dc.date.accessioned2017-01-16T06:09:25Z-
dc.date.available2017-01-16T06:09:25Z-
dc.date.issued2016-
dc.identifier.citationNanoscale, 2016, v. 8, n. 9, p. 5067-5075-
dc.identifier.issn2040-3364-
dc.identifier.urihttp://hdl.handle.net/10722/237522-
dc.description.abstract© The Royal Society of Chemistry 2016.Transition metal and nitrogen co-doping into carbon is an effective approach to promote the catalytic activities towards the oxygen reduction reaction (ORR) and/or oxygen evolution reaction (OER) in the resultant electrocatalysts, M/N-C. The preparation of such catalysts, however, is often complicated and in low yield. Herein we report a robust approach for easy synthesis of M/N-C hybrids in high yield, which includes a mussel-inspired polymerization reaction at room temperature and a subsequent carbonization process. With the introduction of selected transition metal salts into an aqueous solution of dopamine (DA), the obtained mixture self-polymerizes to form metal-containing polydopamine (M-PDA) composites, e.g. Co-PDA, Ni-PDA and Fe-PDA. Upon carbonization at elevated temperatures, these metal-containing composites were converted into M/N-C, i.e. Co-PDA-C, Ni-PDA-C and Fe-PDA-C, respectively, whose morphologies, chemical compositions, and electrochemical performances were fully studied. Enhanced ORR activities were found in all the obtained hybrids, with Co-PDA-C standing out as the most promising catalyst with excellent stability and catalytic activities towards both ORR and OER. This was further proven in Zn-air batteries (ZnABs) in terms of discharge voltage stability and cycling performance. At a discharge-charge current density of 2 mA cm-2 and 1 h per cycle, the Co-PDA-C based ZnABs were able to steadily cycle up to 500 cycles with only a small increase in the discharge-charge voltage gap which notably outperformed Pt/C; at a discharge current density of 5 mA cm-2, the battery continuously discharged for more than 540 h with the discharge voltage above 1 V and a voltage drop rate of merely 0.37 mV h-1. With the simplicity and scalability of the synthetic approach and remarkable battery performances, the Co-PDA-C hybrid catalyst is anticipated to play an important role in practical ZnABs.-
dc.languageeng-
dc.relation.ispartofNanoscale-
dc.titleMussel-inspired one-pot synthesis of transition metal and nitrogen co-doped carbon (M/N-C) as efficient oxygen catalysts for Zn-air batteries-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1039/c5nr06538k-
dc.identifier.scopuseid_2-s2.0-84959378520-
dc.identifier.hkuros285679-
dc.identifier.volume8-
dc.identifier.issue9-
dc.identifier.spage5067-
dc.identifier.epage5075-
dc.identifier.eissn2040-3372-
dc.identifier.isiWOS:000371479000031-
dc.identifier.issnl2040-3364-

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