Producing Green Hydrogen with Rusty Iron! Solar Hydrogen Conversion Efficiency Improved by 3.2 Times

The UNIST research team has unveiled a technology that produces high-efficiency hydrogen using rusted iron. By utilizing solar energy to split water, the team increased hydrogen production efficiency by 3.2 times compared to conventional methods.

This advancement is expected to make affordable and eco-friendly energy more accessible in everyday life.

The research team led by Professor Jang Jihyun of the Department of Energy and Chemical Engineering at UNIST (President Lee Yonghoon) developed an eco-friendly hydrogen production system using photoelectrodes made from iron oxide with excellent electrical properties. Hydrogen production has mainly relied on fossil fuels, which burdens the environment. However, if eco-friendly hydrogen production becomes possible through iron oxide photoelectrodes, commercialization is expected to accelerate.

From the left below, clockwise: Ki Yong Yoon, Researcher (Contributing Author); Ji Hyun Jang, Professor (Corresponding Author); Blaji, Researcher (Contributing Author); Ju Hyung Park, Researcher (First Author).

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Iron oxide has so far suffered from low hydrogen production efficiency due to insufficient electrical performance. The small area for water splitting and the long electron transport distance made commercialization difficult. To address this, the research team focused on the structural characteristics of iron oxide.

By mixing germanium (Ge), titanium (Ti), and tin (Sn) with iron oxide, they improved its electrical properties. They also created a porous structure using heat, which increased the reaction area and shortened the electron transport distance. This overcame the disadvantages of iron oxide and enhanced the efficiency of water splitting.

Through this process, the team produced porous iron oxide electrodes with an average diameter of less than 10 nm. The solar-powered hydrogen conversion efficiency was increased by 3.2 times, and the electrodes could be used continuously for 100 hours without loss of efficiency. This enables stable long-term hydrogen production, bringing commercialization one step closer.

Professor Jang Jihyun stated, "We have achieved a significant technological advancement for commercialization while greatly increasing hydrogen production efficiency," adding, "This will accelerate the commercialization of green hydrogen production and can be applied to various semiconductor systems."

Calculation of the Optimal Doping System for Iron Oxide Photoelectrodes through Simulation.

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This research was published in the international journal 'ACS Energy Letters' on June 3. Park Joohyung, a postdoctoral researcher, participated as the first author. The study was supported by the National Research Foundation of Korea's mid-career research project and the ERC Microplastic Response Chemical and Bio Convergence Process Research Center project.

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