Researchers from three of Germany-based Fraunhofer research institutes have created a compact, modular, self-sufficient cell for producing green hydrogen using solar energy, according to a press release. Unlike traditional electrolysis, which requires large and complex systems, the new photoelectrochemical cell (PEC) module integrates the entire process within a single unit, instead of generating electricity separately for the purposes of later electrolysis elsewhere. The new tech, part of the Neo-PEC joint research project, offers a reliable method for generating hydrogen without a carbon footprint.

How does it work? The tandem PEC module is designed to maintain a strict separation between hydrogen and oxygen during and after generation, the statement adds. The module’s design allows it to absorb short-wavelength light on one side and long-wavelength light on the other, optimizing the use of solar energy. The module uses semiconducting materials coated on both sides of standard glass to split water into hydrogen and oxygen directly when exposed to sunlight. The method both simplifies the hydrogen production process and also enhances efficiency and flexibility.

What differentiates the model from typical ones? The photovoltaic elements within the module provide additional voltage to enhance the system’s efficiency. With an active surface area of 0.5 sqm, a single module can generate over 30 kg of hydrogen per year under European sunlight conditions, sufficient to power a hydrogen car for 15k to 20k kms annually.

An outlook: The Fraunhofer teams are planning to continue their research and development in collaboration with the private sector, aiming to further enhance the module’s capabilities and expand its commercial applications.

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