Leal-Rodríguez, CarlosRodríguez-Padrón, DailyAlothman, Zeid ACano, ManuelGiner-Casares, Juan JMuñoz-Batista, Mario JOsman, Sameh MLuque, Rafael2023-02-082023-02-082020-04-03http://hdl.handle.net/10668/15314The oxygen evolution reaction (OER) plays a key role in the water splitting process and a high energy conversion efficiency is essential for the definitive advance of hydrogen-based technologies. Unfortunately, the green and sustainable development of electrocatalysts for water oxidation is nowadays a real challenge. Herein, a successful mechanochemical method is proposed for the synthesis of a novel hemoglobin (Hb) modified Co3O4/g-C3N4 composite nanomaterial. The controlled incorporation of cobalt entities as well as Hb functionalization, without affecting the g-C3N4 nanoarchitecture, was evaluated using different physicochemical techniques, such as X-ray diffraction, N2-physisorption, scanning electron microscopy, UV-visible spectroscopy and X-ray photoelectron spectroscopy. The beneficial effect of the resulting ternary bioconjugate together with the influence of the temperature and light irradiation was investigated by electrochemical analysis. At 60 °C and under light exposition, this electrocatalyst requires an overpotential of 370 mV to deliver a current density of 10 mA·cm-2, showing a Tafel slope of 66 mV·dec-1 and outstanding long-term stability for 600 OER cycles. This work paves a way for the controlled fabrication of multidimensional and multifunctional bio-electrocatalysts.enAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/CatalysisCobaltElectrochemical TechniquesGraphiteHemoglobinsLightNanocompositesNitrogen CompoundsOxidation-ReductionOxidesOxygenTemperatureWaterresearch article32242199open access10.1039/d0nr00818d2040-3372http://helvia.uco.es/xmlui/bitstream/10396/21018/3/carlos_leal_nanoscale_%202020.pdf