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      Porous cobalt-based thin film as a bifunctional catalyst for hydrogen generation and oxygen generation.

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          Abstract

          A mixed-phased Co-based catalyst composed of Co phosphide and Co phosphate is successfully fabricated for bifunctional water electrolysis. The highly porous morphology in this anodized film enables efficient catalytic activity toward water splitting in an extremely low loading mass. The mixed phases in the porous film afford an ability to generate both H2 and O2 in a single electrolyzer.

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          Most cited references24

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          Photosynthetic energy conversion: natural and artificial.

          Photosystem II (PSII) is the water splitting enzyme of photosynthesis. Its appearance during evolution dramatically changed the chemical composition of our planet and set in motion an unprecedented explosion in biological activity. Powered by sunlight, PSII supplies biology with the 'hydrogen' needed to convert carbon dioxide into organic molecules. The questions now are can we continue to exploit this photosynthetic process through increased use of biomass as an energy source and, more importantly, can we address the energy/CO2 problem by developing new photochemical technologies which mimic the natural system? (Critical review, 82 references).
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            Molybdenum boride and carbide catalyze hydrogen evolution in both acidic and basic solutions.

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              Mechanistic studies of the oxygen evolution reaction by a cobalt-phosphate catalyst at neutral pH.

              The mechanism of the oxygen evolution reaction (OER) by catalysts prepared by electrodepositions from Co(2+) solutions in phosphate electrolytes (Co-Pi) was studied at neutral pH by electrokinetic and (18)O isotope experiments. Low-potential electrodepositions enabled the controlled preparation of ultrathin Co-Pi catalyst films (<100 nm) that could be studied kinetically in the absence of mass transport and charge transport limitations to the OER. The Co-Pi catalysts exhibit a Tafel slope approximately equal to 2.3 × RT/F for the production of oxygen from water in neutral solutions. The electrochemical rate law exhibits an inverse first order dependence on proton activity and a zeroth order dependence on phosphate for [Pi] ≥ 0.03 M. In the absence of phosphate buffer, the Tafel slope is increased ∼3-fold and the overall activity is greatly diminished. Together, these electrokinetic studies suggest a mechanism involving a rapid, one electron, one proton equilibrium between Co(III)-OH and Co(IV)-O in which a phosphate species is the proton acceptor, followed by a chemical turnover-limiting process involving oxygen-oxygen bond coupling.
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                Author and article information

                Journal
                Adv. Mater. Weinheim
                Advanced materials (Deerfield Beach, Fla.)
                Wiley-Blackwell
                1521-4095
                0935-9648
                May 27 2015
                : 27
                : 20
                Affiliations
                [1 ] Department of Chemistry, Rice University, 6100 Main Street, Houston, TX, 77005, USA.
                [2 ] Smalley Institute for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston, TX, 77005, USA.
                [3 ] Department of Materials Science and NanoEngineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA.
                Article
                10.1002/adma.201500894
                25872881
                c7098b08-c5d6-4086-8690-fe52c66c1900
                History

                catalysts,cobalt,porous,thin films,water splitting
                catalysts, cobalt, porous, thin films, water splitting

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