000126568 001__ 126568
000126568 005__ 20230706095714.0
000126568 0247_ $$2doi$$a10.3390/colorants2020020
000126568 0248_ $$2sideral$$a134007
000126568 037__ $$aART-2023-134007
000126568 041__ $$aeng
000126568 100__ $$0(orcid)0000-0001-9690-9662$$aDuerto, Isolda
000126568 245__ $$aMetal-Free counter electrodes for DSSCs based on nitrogen-doped reduced graphene oxide materials
000126568 260__ $$c2023
000126568 5060_ $$aAccess copy available to the general public$$fUnrestricted
000126568 5203_ $$aThe importance of counter electrodes in Dye Sensitized Solar Cells (DSSCs) cannot be neglected as they enable the transfer of electrons across the outer circuit, thereby facilitating the reduction reaction of the I3−/I− redox electrolyte. However, the dissolution and deposition of the usual platinum layer on the counter electrode has resulted in contamination concerns. To address this issue, metal-free counter electrodes made of reduced graphene oxide (rGO) aerogels were developed and their catalytic performance towards I3− reduction was evaluated. The reduced graphene materials were characterized, and the fitting analysis of XPS revealed the presence of various nitrogen species, with the primary peaks attributed to pyridinic and pyrrolic nitrogen. The hydrothermal treatment of graphene oxide (GO) resulted in a higher graphitic character and the intensification of the contacts between graphene nanosheets, which should entail higher electrical conductivity, both in-plane and between rGO sheets. Additionally, the presence of nitrogen-provided active sites promoted the catalytic reduction of the electrolyte. Encouragingly, good charge transfer rates were observed between the counter electrode and the electrolyte in the assembled DSSCs, resulting in good photocurrents and exceptional stability over the course of nearly 1200 h after cell assembly. The results obtained suggest that these GO-based systems are promising candidates for developing metal-free counter electrodes for DSSC, supporting the interest of further study.
000126568 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttp://creativecommons.org/licenses/by/3.0/es/
000126568 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000126568 700__ $$aCarrera, Clara
000126568 700__ $$0(orcid)0000-0003-1466-5719$$aBarrios, Daniel
000126568 700__ $$aBenito, Ana M.
000126568 700__ $$aMaser, Wolfgang K.
000126568 700__ $$0(orcid)0000-0001-9814-0834$$aVillacampa, Belén$$uUniversidad de Zaragoza
000126568 700__ $$aGarcía-Bordejé, Enrique
000126568 700__ $$0(orcid)0000-0001-7193-1732$$aBlesa, María-Jesús$$uUniversidad de Zaragoza
000126568 7102_ $$12013$$2765$$aUniversidad de Zaragoza$$bDpto. Química Orgánica$$cÁrea Química Orgánica
000126568 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000126568 773__ $$g2, 2 (2023), 443-452$$tColorants$$x2079-6447
000126568 8564_ $$s1430145$$uhttps://zaguan.unizar.es/record/126568/files/texto_completo.pdf$$yVersión publicada
000126568 8564_ $$s2768273$$uhttps://zaguan.unizar.es/record/126568/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000126568 909CO $$ooai:zaguan.unizar.es:126568$$particulos$$pdriver
000126568 951__ $$a2023-07-06-07:59:31
000126568 980__ $$aARTICLE