To overcome the energy and environmental crisis the world is currently facing, H2 fuel production from water is highly sought after as it is a source of clean energy. Hence, solar driven photocatalytic water splitting has garnered tremendous attention in recent times. Inspired from nature’s approach which utilizes a combination of a photosensitizer and catalyst, we have designed a construct having gold nanoparticle as sensitizer and earth-abundant, inexpensive manganese oxides (MnOx) as a water oxidation catalyst [3]. Herein, we demonstrate that covering of MnOx shell over gold nanoparticles (AuNPs) can result in a strong enhancement of catalytic activity for the water oxidation reaction. Our antenna-reactor construct showed a low onset overpotential below 200 mV for water oxidation process at pH 13. This construct is highly photoactive, yielding photocurrent of 285uA with incident photon to photocurrent ratio of 0.09% under broadband illumination of light. This increase of current was attributed to the generation of plasmonic hot holes, which facilitated the oxidation of water.

To overcome the energy and environmental crisis the world is currently facing, H~2~ fuel production from water is highly sought after as it is a source of clean energy. Hence, solar driven photocatalytic water splitting has garnered tremendous attention in recent times. Inspired from nature’s approach which utilizes a combination of a photosensitizer and catalyst, we have designed a construct having gold nanoparticle as sensitizer and earth-abundant, inexpensive manganese oxides (MnOx) as a water oxidation catalyst [3]. Herein, we demonstrate that covering of MnOx shell over gold nanoparticles (AuNPs) can result in a strong enhancement of catalytic activity for the water oxidation reaction. Our antenna-reactor construct showed a low onset overpotential below 200 mV for water oxidation process at pH 13. This construct is highly photoactive, yielding photocurrent of 285uA with incident photon to photocurrent ratio of 0.09% under broadband illumination of light. This increase of current was attributed to the generation of plasmonic hot holes, which facilitated the oxidation of water.

Hot-hole driven enhancement in the photo electrochemical water oxidation process using AuMnOx Nano-construct

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27th CRSI National Symposium in Chemistry

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