Experts in nano-scale chemistry have made significant progress toward advancing the sustainable and efficient generation of hydrogen from water using solar power. An international collaborative study, led by Flinders University with partners in South Australia, the US, and Germany, has identified a novel solar cell process that could play a key role in future technologies for photocatalytic water splitting and green hydrogen production.

The study, which combines the work of US researchers led by Professor Paul Maggard on catalysts for water splitting, found that a new class of kinetically stable 'core and shell Sn(II)-perovskite' oxide solar material could act as a catalyst for the critical oxygen evolution reaction in hydrogen production. This breakthrough could help produce pollution-free hydrogen energy in the future.

Published in The Journal of Physical Chemistry C, the results mark a significant step toward developing carbon-free green hydrogen technologies. These technologies utilize non-greenhouse gas-emitting power sources, facilitating efficient, affordable electrolysis for hydrogen production.

"This study represents an important advancement in understanding how tin compounds can be stabilized and made effective in water," said lead author Professor Gunther Andersson from the Flinders Institute for Nanoscale Science and Technology. "Our material offers a new chemical strategy for absorbing a wide range of sunlight energy and using it to drive fuel-producing reactions."

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Sn(II) compounds, already used in catalysis, diagnostic imaging, and therapeutic drugs, have been known to react with water and oxygen, limiting their broader technological applications. However, the findings from this study suggest a promising path forward for overcoming this limitation and improving the efficiency of solar-driven hydrogen production.

Solar photovoltaic research worldwide is focused on developing cost-effective, high-performance perovskite systems as alternatives to traditional silicon and other materials used in solar panels. Hydrogen can be produced from water through electrolysis or thermochemical water splitting, with both processes potentially powered by concentrated solar power or waste heat from nuclear reactors.

While hydrogen can be produced from fossil fuels and biomass, the environmental impact and energy efficiency vary based on the production method. Solar-driven processes, using light to generate hydrogen, offer a promising alternative for industrial-scale hydrogen generation.

The study builds on previous work led by Professor Paul Maggard, now at Baylor University, and includes contributions from Flinders University, the University of Adelaide, and Universität Münster in Germany.