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Article: Cobalt and nickel complexes of 2,2′ : 6′,2″ : 6″,2‴-quaterpyridine as catalysts for electrochemical reduction of carbon dioxide

TitleCobalt and nickel complexes of 2,2′ : 6′,2″ : 6″,2‴-quaterpyridine as catalysts for electrochemical reduction of carbon dioxide
Authors
Issue Date1995
PublisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/dalton
Citation
Journal Of The Chemical Society, Dalton Transactions, 1995 n. 7, p. 1103-1107 How to Cite?
AbstractThe complexes [Co(qtpy)(OH2)2][ClO4]2 and [Ni(qtpy)(MeCN)2][ClO4]2 (qtpy = 2,2′: 6′,2″:6′,2‴-quaterpyridine) were prepared by treating qtpy with Co(ClO4)2·6H2O and Ni(ClO4)·6H2O respectively in acetonitrile. In acetonitrile both complexes show one reversible couple assignable as the [M(qtpy)L2]2+/+ couple {E1/2 for [Co(qtpy)(OH2)2]2+/+ = -0.67 V; [Ni(qtpy)(MeCN)2]2+/+ = -0.79 V vs. saturated calomel electrode. SCE}, one quasi-reversible couple assignable as [M(qtpy)]+/0 (E1/2 = -0.96 for Co, -1.15 V for Ni) and one reduction wave at about -1.98 V vs. SCE assignable as reduction of [M(qtpy)] to [M(qtpy)]-. Constant-potential electrolysis of a 0.2-0.4 mmol dm-3 solution of [Co(qtpy)(OH2)2]2+ in the presence of CO2 at -1.7 V resulted in the production of CO with a current efficiency of about 80%. At bulk concentration of [Co(qtpy)(OH2)2]2+ ≥ 0.2 mmol dm-3, electrodeposition of the cobalt complex occurs at -1.65 V vs. SCE to give a dark brown electroactive film on the electrode surface. The cobalt-modified electrode is catalytically active towards the electrochemical reduction of carbon dioxide both in acetonitrile and in water. Constant-potential electrolysis with the cobalt-modified electrode at -1.7 V in acetonitrile and at -1.3 V in water resulted in the production of CO with current efficiencies of about 35%. No film formation on the electrode was observed for [Ni(qtpy)(MeCN)2]2+ and its catalytic activity towards reduction of CO2 is much less than that of the cobalt complex.
Persistent Identifierhttp://hdl.handle.net/10722/168175
ISSN
2002 Impact Factor: 3.023
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLam, KMen_US
dc.contributor.authorWong, KYen_US
dc.contributor.authorYang, SMen_US
dc.contributor.authorChe, CMen_US
dc.date.accessioned2012-10-08T03:15:57Z-
dc.date.available2012-10-08T03:15:57Z-
dc.date.issued1995en_US
dc.identifier.citationJournal Of The Chemical Society, Dalton Transactions, 1995 n. 7, p. 1103-1107en_US
dc.identifier.issn1472-7773en_US
dc.identifier.urihttp://hdl.handle.net/10722/168175-
dc.description.abstractThe complexes [Co(qtpy)(OH2)2][ClO4]2 and [Ni(qtpy)(MeCN)2][ClO4]2 (qtpy = 2,2′: 6′,2″:6′,2‴-quaterpyridine) were prepared by treating qtpy with Co(ClO4)2·6H2O and Ni(ClO4)·6H2O respectively in acetonitrile. In acetonitrile both complexes show one reversible couple assignable as the [M(qtpy)L2]2+/+ couple {E1/2 for [Co(qtpy)(OH2)2]2+/+ = -0.67 V; [Ni(qtpy)(MeCN)2]2+/+ = -0.79 V vs. saturated calomel electrode. SCE}, one quasi-reversible couple assignable as [M(qtpy)]+/0 (E1/2 = -0.96 for Co, -1.15 V for Ni) and one reduction wave at about -1.98 V vs. SCE assignable as reduction of [M(qtpy)] to [M(qtpy)]-. Constant-potential electrolysis of a 0.2-0.4 mmol dm-3 solution of [Co(qtpy)(OH2)2]2+ in the presence of CO2 at -1.7 V resulted in the production of CO with a current efficiency of about 80%. At bulk concentration of [Co(qtpy)(OH2)2]2+ ≥ 0.2 mmol dm-3, electrodeposition of the cobalt complex occurs at -1.65 V vs. SCE to give a dark brown electroactive film on the electrode surface. The cobalt-modified electrode is catalytically active towards the electrochemical reduction of carbon dioxide both in acetonitrile and in water. Constant-potential electrolysis with the cobalt-modified electrode at -1.7 V in acetonitrile and at -1.3 V in water resulted in the production of CO with current efficiencies of about 35%. No film formation on the electrode was observed for [Ni(qtpy)(MeCN)2]2+ and its catalytic activity towards reduction of CO2 is much less than that of the cobalt complex.en_US
dc.languageengen_US
dc.publisherRoyal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/daltonen_US
dc.relation.ispartofJournal of the Chemical Society, Dalton Transactionsen_US
dc.titleCobalt and nickel complexes of 2,2′ : 6′,2″ : 6″,2‴-quaterpyridine as catalysts for electrochemical reduction of carbon dioxideen_US
dc.typeArticleen_US
dc.identifier.emailChe, CM:cmche@hku.hken_US
dc.identifier.authorityChe, CM=rp00670en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1039/DT9950001103en_US
dc.identifier.scopuseid_2-s2.0-37049069584en_US
dc.identifier.hkuros1470-
dc.identifier.issue7en_US
dc.identifier.spage1103en_US
dc.identifier.epage1107en_US
dc.identifier.isiWOS:A1995QT25300008-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLam, KM=36919953200en_US
dc.identifier.scopusauthoridWong, KY=7404760030en_US
dc.identifier.scopusauthoridYang, SM=7408521494en_US
dc.identifier.scopusauthoridChe, CM=7102442791en_US

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