000087754 001__ 87754
000087754 005__ 20230921135430.0
000087754 0247_ $$2doi$$a10.1039/c8na00130h
000087754 0248_ $$2sideral$$a114068
000087754 037__ $$aART-2019-114068
000087754 041__ $$aeng
000087754 100__ $$aKagkoura, Antonia
000087754 245__ $$aSulfur-doped graphene/transition metal dichalcogenide heterostructured hybrids with electrocatalytic activity toward the hydrogen evolution reaction
000087754 260__ $$c2019
000087754 5060_ $$aAccess copy available to the general public$$fUnrestricted
000087754 5203_ $$aA facile route for the preparation of molybdenum disulfide (MoS2) and tungsten disulfide (WS2), uniformly deposited onto sulfur-doped graphene (SG), is reported. The realization of the SG/MoS2 and SG/WS2 heterostructured hybrids was accomplished by employing microwave irradiation for the thermal decomposition of ammonium tetrathiomolybdate and tetrathiotungstate, respectively, in the presence of SG. Two different weight ratios between SG and the inorganic species were used, namely 3:1 and 1:1, yielding SG/MoS2 (3:1), SG/MoS2 (1:1), SG/WS2 (3:1) and SG/WS2 (1:1). SG and all newly developed hybrid materials were characterized by ATR-IR and Raman spectroscopy, TGA, HR-TEM and EELS. The electrocatalytic activity of the SG/MoS2 and SG/WS2 heterostructured hybrids was examined against the hydrogen evolution reaction (HER) and it was found that the presence of SG not only significantly improved the catalytic activity of MoS2 and WS2 but also made it comparable to that of commercial Pt/C. Specifically, hybrids containing higher amounts of SG, namely SG/MoS2 (3:1) and SG/WS2 (3:1), exhibited extremely low onset overpotentials of 26 and 140 mV vs. RHE, respectively. The latter results highlighted the beneficial role of SG as a substrate for immobilizing MoS2 and WS2 and stressed its significance for achieving optimum electrocatalytic performance toward the HER. Finally, examination of the Tafel slopes as extracted from the electrocatalytic polarization curves, manifested the adsorption of hydrogen as the rate-limiting step for SG/MoS2 (3:1), while for SG/WS2 (3:1) the electrochemical desorption of adsorbed hydrogen atoms to generate hydrogen was revealed to be the rate-limiting step.
000087754 536__ $$9info:eu-repo/grantAgreement/EC/H2020/642742/EU/Graphene-based nanomaterials for touchscreen technologies: Comprehension, Commerce and Communication/Enabling Excellence$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 642742-Enabling Excellence
000087754 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc$$uhttp://creativecommons.org/licenses/by-nc/3.0/es/
000087754 592__ $$a0.0$$b2019
000087754 593__ $$aAtomic and Molecular Physics, and Optics$$c2019
000087754 593__ $$aBioengineering$$c2019
000087754 593__ $$aMaterials Science (miscellaneous)$$c2019
000087754 593__ $$aEngineering (miscellaneous)$$c2019
000087754 593__ $$aChemistry (miscellaneous)$$c2019
000087754 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000087754 700__ $$0(orcid)0000-0001-5079-621X$$aPelaez-Fernandez, Mario$$uUniversidad de Zaragoza
000087754 700__ $$0(orcid)0000-0002-2071-9093$$aArenal, Raul$$uUniversidad de Zaragoza
000087754 700__ $$aTagmatarchis, Nikos
000087754 7102_ $$12003$$2395$$aUniversidad de Zaragoza$$bDpto. Física Materia Condensa.$$cÁrea Física Materia Condensada
000087754 773__ $$g1, 4 (2019), 1489-1496$$tNanoscale Advances$$x2516-0230
000087754 8564_ $$s830507$$uhttps://zaguan.unizar.es/record/87754/files/texto_completo.pdf$$yVersión publicada
000087754 8564_ $$s49728$$uhttps://zaguan.unizar.es/record/87754/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000087754 909CO $$ooai:zaguan.unizar.es:87754$$particulos$$pdriver
000087754 951__ $$a2023-09-21-13:29:59
000087754 980__ $$aARTICLE