{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T03:20:35Z","timestamp":1761621635647,"version":"build-2065373602"},"reference-count":54,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2022,8,19]],"date-time":"2022-08-19T00:00:00Z","timestamp":1660867200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Ministry of Education, Science and Technological Development of Republic of Serbia","award":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"],"award-info":[{"award-number":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"]}]},{"name":"Science and Technological cooperation agreement MINCyT (Argentina)\u2014MEC (Portugal)","award":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"],"award-info":[{"award-number":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"]}]},{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia (FCT, Portugal)","doi-asserted-by":"publisher","award":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"],"award-info":[{"award-number":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"name":"UniRCell","award":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"],"award-info":[{"award-number":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"]}]},{"name":"CICECO Aveiro Institute of Materials","award":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"],"award-info":[{"award-number":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"]}]},{"name":"FCT\/MEC (PIDDAC)","award":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"],"award-info":[{"award-number":["OI172043","PO\/14\/04","UIDP\/04540\/2020","IST-ID\/156-2018","SAICTPAC\/0032\/2015","POCI-01-0145-FEDER-016422","UIDB\/50011\/2020","UIDP\/50011\/2020","LA\/P\/0006\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Batteries"],"abstract":"<jats:p>Nickel-doped ceria (Ce1\u2212xNixO2\u2212\u03b4) nanopowders (7 to 5 nm in size) synthesized by the cation complexation method with 5, 10, 15, and 20 Ni at.% are studied with respect to their electrochemical activity for the oxygen reduction (ORR) and oxygen evolution (OER) reactions in alkaline medium. One finds good bifunctional electrocatalytic activity of the four Ce1\u2212xNixO2\u2212\u03b4 electrocatalysts. The Tafel analysis of the ORR in the 0.57\u20130.78 V vs. RHE potential window leads to slopes in the 70\u2013108 mV dec\u22121 range. The number of electrons exchanged during ORR is between 2 and 2.7. The OER Tafel slopes are determined to be in the range 192 \u2013281 mV dec\u22121. OER activation energies are found to range between 28 and 43 kJ mol\u22121. The specific capacitance of Ce1\u2212xNixO2\u2212\u03b4 electrocatalysts measured at a scan rate of 100 mV s\u22121 varies between 0.7 and 1.4 Fg\u22121. The results demonstrate that Ce1\u2212xNixO2\u2212\u03b4 nanopowders can act as bifunctional electrocatalysts for ORR\/OER for potential application in the oxygen electrode of devices such as rechargeable metal\u2013air batteries.<\/jats:p>","DOI":"10.3390\/batteries8080100","type":"journal-article","created":{"date-parts":[[2022,8,21]],"date-time":"2022-08-21T21:05:51Z","timestamp":1661115951000},"page":"100","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":10,"title":["Nickel-Doped Ceria Bifunctional Electrocatalysts for Oxygen Reduction and Evolution in Alkaline Media"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2266-6738","authenticated-orcid":false,"given":"Jadranka","family":"Miliki\u0107","sequence":"first","affiliation":[{"name":"University of Belgrade, Faculty of Physical Chemistry, Studentski trg 12\u201316, 11158 Belgrade, Serbia"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9105-9670","authenticated-orcid":false,"given":"Rodolfo O.","family":"Fuentes","sequence":"additional","affiliation":[{"name":"Instituto de Nanociencia y Nanotecnolog\u00eda, Departamento de F\u00edsica, Centro At\u00f3mico Constituyentes, CNEA-CONICET, Av. Gral. Paz 1499, San Mart\u00edn, Buenos Aires B1650, Argentina"}]},{"given":"Julia E.","family":"Tasca","sequence":"additional","affiliation":[{"name":"CIFICEN (UNCPBA-CICPBA-CONICET), Facultad de Ingenier\u00eda\u2013UNCPBA, Av. Del Valle 5737, Olavarr\u00eda B74001WI, Argentina"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7920-2638","authenticated-orcid":false,"given":"Diogo M. F.","family":"Santos","sequence":"additional","affiliation":[{"name":"Center of Physics and Engineering of Advanced Materials (CeFEMA), Laboratory for Physics of Materials and Emerging Technologies (LaPMET), Chemical Engineering Department, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049\u2013001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0203-4012","authenticated-orcid":false,"given":"Biljana","family":"\u0160ljuki\u0107","sequence":"additional","affiliation":[{"name":"University of Belgrade, Faculty of Physical Chemistry, Studentski trg 12\u201316, 11158 Belgrade, Serbia"},{"name":"Center of Physics and Engineering of Advanced Materials (CeFEMA), Laboratory for Physics of Materials and Emerging Technologies (LaPMET), Chemical Engineering Department, Instituto Superior T\u00e9cnico, Universidade de Lisboa, 1049\u2013001 Lisbon, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7799-2608","authenticated-orcid":false,"given":"Filipe M. L.","family":"Figueiredo","sequence":"additional","affiliation":[{"name":"CICECO, Physics Dept., University of Aveiro, Campus Universit\u00e1rio de Santiago, 3810-193 Aveiro, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"117","DOI":"10.1595\/003214002X463117135","article-title":"Catalysis for low temperature fuel cells","volume":"46","author":"Ralph","year":"2002","journal-title":"Platin. Met. Rev."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"6076","DOI":"10.1021\/ja211751k","article-title":"Membraneless, Room-Temperature, Direct Borohydride\/Cerium Fuel Cell with Power Density of Over 0.25 W cm\u22122","volume":"134","author":"Mota","year":"2012","journal-title":"J. Am. Chem. 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