Journal
NANOSCALE
Volume 12, Issue 15, Pages 8477-8484Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr00818d
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Funding
- Spanish Ministry of Economy and Competitiveness (MINECO) [CTQ2016-78289-P]
- European Regional Development Funds (FEDER)
- MINECO of Spain [CTQ2017-83961-R, CTQ2017-92264-EXP]
- FEDER
- Andalusian Government (Consejeria de Economia, Conocimiento, Empresas y Universidades, Junta de Andalucia) of Spain [UCO-1263193]
- Distinguished Scientist Fellowship Program (DSFP) at King Saud University, Riyadh, Saudi Arabia
- MINECO [RyC-2014-14956]
- MINECO
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The 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, N-2-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 degrees C and under light exposition, this electrocatalyst requires an overpotential of 370 mV to deliver a current density of 10 mA center dot cm(-2), showing a Tafel slope of 66 mV center dot 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.
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