{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,3]],"date-time":"2025-11-03T04:49:32Z","timestamp":1762145372786,"version":"build-2065373602"},"reference-count":47,"publisher":"Wiley","issue":"35","license":[{"start":{"date-parts":[[2018,9,21]],"date-time":"2018-09-21T00:00:00Z","timestamp":1537488000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"FCT - Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","award":["UID\/QUI\/50006\/2013-POCI\/01\/0145\/FEDER\/007265","POCI\/01\/0145\/FEDER\/006984","POCI-01-0145-FEDER-16422"],"award-info":[{"award-number":["UID\/QUI\/50006\/2013-POCI\/01\/0145\/FEDER\/007265","POCI\/01\/0145\/FEDER\/006984","POCI-01-0145-FEDER-16422"]}]},{"name":"Programa Operacional Competitividade e Internacionaliza\u00e7\u00e3o - COMPETE2020"},{"name":"FCT","award":["SFRH\/BD\/89156\/2012","ERAMIN\/0006\/2015"],"award-info":[{"award-number":["SFRH\/BD\/89156\/2012","ERAMIN\/0006\/2015"]}]}],"content-domain":{"domain":["chemistry-europe.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["ChemistrySelect"],"published-print":{"date-parts":[[2018,9,21]]},"abstract":"Abstract<\/jats:title>\n \n Herein, we report the preparation of Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n nanoparticles anchored on the surface of selectively oxidized graphene flakes with KMnO\n 4<\/jats:sub>\n and O\n 3<\/jats:sub>\n \u2010 Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n @GF_KMnO\n 4<\/jats:sub>\n and Co\n 3<\/jats:sub>\n O4@GF_O\n 3<\/jats:sub>\n nanocomposites \u2010 and the study of their electrocatalytic performance towards the oxygen reduction (ORR) and oxygen evolution reactions (OER). Both nanocomposites displayed ORR and OER electrocatalytic activity in alkaline medium. For ORR, onset potentials of 0.79\u2005V and 0.82\u2005V vs. RHE were achieved for Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n @GF_ KMnO\n 4<\/jats:sub>\n and Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n @GF_O\n 3<\/jats:sub>\n , respectively. Both nanocomposites presented excellent tolerance to methanol and, in the case of Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n @GF_O\n 3<\/jats:sub>\n , a superior long\u2010term stability with a current retention of 96.8% after 20 000\u2005s. For OER, the overpotential was 0.44 and 0.45\u2005V for Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n @GF_KMnO\n 4<\/jats:sub>\n and Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n @GF_O\n 3<\/jats:sub>\n , respectively. Additionally, Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n @GF_O\n 3<\/jats:sub>\n presented higher current densities, Faradaic efficiencies, and long\u2010term stability (current loss of 32% after 15 000\u2005s). The superior bifunctional ORR\/OER electrocatalytic activity displayed by Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n @GF_O\n 3<\/jats:sub>\n arises from the stronger chemical coupling between Co\n 3<\/jats:sub>\n O\n 4<\/jats:sub>\n nanoparticles and specific oxygen surface groups of GF_O\n 3<\/jats:sub>\n flakes.\n <\/jats:p>","DOI":"10.1002\/slct.201802108","type":"journal-article","created":{"date-parts":[[2018,9,21]],"date-time":"2018-09-21T21:09:01Z","timestamp":1537564141000},"page":"10064-10076","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Co\n 3<\/sub>\n O\n 4<\/sub>\n Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactions"],"prefix":"10.1002","volume":"3","author":[{"given":"Mariana P.","family":"Ara\u00fajo","sequence":"first","affiliation":[{"name":"REQUIMTE\/LAQV Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias Universidade do Porto Rua do Campo Alegre s\/n 4169-007 Porto Portugal"}]},{"given":"Marta","family":"Nunes","sequence":"additional","affiliation":[{"name":"REQUIMTE\/LAQV Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias Universidade do Porto Rua do Campo Alegre s\/n 4169-007 Porto Portugal"}]},{"given":"In\u00eas M.","family":"Rocha","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Cat\u00e1lise e Materiais (LCM) Laborat\u00f3rio Associado LSRE-LCM Departamento de Engenharia Qu\u00edmica Faculdade de Engenharia Universidade do Porto Rua Dr. Roberto Frias s\/n 4200-465 Porto Portugal"}]},{"given":"M. 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R.","family":"Pereira","sequence":"additional","affiliation":[{"name":"Laborat\u00f3rio de Cat\u00e1lise e Materiais (LCM) Laborat\u00f3rio Associado LSRE-LCM Departamento de Engenharia Qu\u00edmica Faculdade de Engenharia Universidade do Porto Rua Dr. Roberto Frias s\/n 4200-465 Porto Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1753-8678","authenticated-orcid":false,"given":"Cristina","family":"Freire","sequence":"additional","affiliation":[{"name":"REQUIMTE\/LAQV Departamento de Qu\u00edmica e Bioqu\u00edmica Faculdade de Ci\u00eancias Universidade do Porto Rua do Campo Alegre s\/n 4169-007 Porto Portugal"}]}],"member":"311","published-online":{"date-parts":[[2018,9,21]]},"reference":[{"key":"e_1_2_6_1_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijhydene.2013.10.060"},{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/cssc.201000182"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/adma.201301207"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2014.05.050"},{"key":"e_1_2_6_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.rser.2016.07.046"},{"key":"e_1_2_6_6_1","doi-asserted-by":"publisher","DOI":"10.1039\/C4CS00470A"},{"key":"e_1_2_6_7_1","doi-asserted-by":"publisher","DOI":"10.1039\/C6EE01046F"},{"key":"e_1_2_6_8_1","doi-asserted-by":"publisher","DOI":"10.1039\/C6TA00945J"},{"key":"e_1_2_6_9_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2015.08.160"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1039\/C5EE02463C"},{"key":"e_1_2_6_11_1","doi-asserted-by":"publisher","DOI":"10.1021\/cm201439d"},{"key":"e_1_2_6_12_1","doi-asserted-by":"publisher","DOI":"10.1039\/c2ee21746e"},{"key":"e_1_2_6_13_1","doi-asserted-by":"publisher","DOI":"10.1021\/jp904022e"},{"key":"e_1_2_6_14_1","doi-asserted-by":"publisher","DOI":"10.1039\/C4NR05988C"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2015.02.044"},{"key":"e_1_2_6_16_1","doi-asserted-by":"publisher","DOI":"10.1002\/adfm.201502217"},{"key":"e_1_2_6_17_1","doi-asserted-by":"publisher","DOI":"10.1039\/C6TA01349J"},{"key":"e_1_2_6_18_1","doi-asserted-by":"publisher","DOI":"10.1021\/acs.jpcc.6b00313"},{"key":"e_1_2_6_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.ijhydene.2015.01.100"},{"key":"e_1_2_6_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.apcatb.2012.11.040"},{"key":"e_1_2_6_21_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10800-014-0690-2"},{"key":"e_1_2_6_22_1","doi-asserted-by":"publisher","DOI":"10.1039\/C4RA12510J"},{"key":"e_1_2_6_23_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.electacta.2016.12.191"},{"key":"e_1_2_6_24_1","first-page":"17047117","volume":"29","author":"Guan C.","year":"2017","journal-title":"Adv. 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