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Writer's pictureRavi Chen

Hydrogen fuel from sunlight and water: Japan’s breakthrough for clean energy


Hydrogen fuel from sunlight and water: Japan’s breakthrough for clean energy
Hydrogen fuel from sunlight and water: Japan’s breakthrough for clean energy

Japan's scientific breakthrough in developing technology to convert sunlight and water into hydrogen fuel is a promising step towards achieving sustainable development. This innovative process, which utilises photocatalysts, aligns with several UN Sustainable Development Goals (SDGs), particularly those focused on affordable and clean energy (SDG 7), climate action (SDG 13), and peace and justice (SDG 16).


By harnessing the potential of this renewable energy source, nations could transition from fossil fuels, reduce carbon emissions, and foster a more sustainable future.


How does the technology work?


At its core, this process uses sunlight-driven water splitting to generate hydrogen and oxygen. Unlike traditional methods that rely on fossil fuels, this innovative approach employs photocatalysts—materials that facilitate chemical reactions when exposed to light. While one-step systems have struggled with low solar-to-hydrogen energy conversion rates, Japan’s scientists have embraced a more efficient two-step excitation system, which uses separate photocatalysts for hydrogen and oxygen production.


In laboratory tests, this system demonstrated an efficiency increase of 1.5 times when exposed to natural sunlight compared to standard simulated sunlight. The team's three-year trial with a 100 m² reactor reinforced its potential as a reliable and practical method for renewable energy production. However, current efficiencies remain capped at around 1%, with ambitions to break the 5% efficiency barrier requiring further advancements in photocatalyst technology.


The global importance of hydrogen fuelHydrogen is increasingly recognised as a cornerstone of the clean energy transition. Currently, most hydrogen is derived from natural gas feedstocks, emitting significant greenhouse gases in the process. The ability to produce hydrogen from water and sunlight offers an environmentally friendly alternative that could reduce dependence on fossil fuels and lower global carbon emissions.


Moreover, storing solar energy in chemical form enables its use even during non-sunny periods, addressing the intermittency challenge of solar power. This breakthrough has broad applications, from powering vehicles to supporting energy-intensive industries, all while contributing to economic equality by reducing energy costs in developing regions.

 



 

Real-world initiatives and applicationsThe efforts led by Japan's Shinshu University team, including Professor Kazunari Domen and Dr Takashi Hisatomi, exemplify how innovation and global collaboration can drive progress. Their work could inspire policymakers and researchers worldwide to prioritise renewable energy infrastructure and policies.


Beyond Japan, organisations like the International Renewable Energy Agency (IRENA) are already investing in global hydrogen projects, promoting its role in decarbonising energy systems. Similarly, the European Union’s Green Deal includes funding for hydrogen-based technologies, underscoring the global recognition of hydrogen as a vital component of sustainable development.


The role of the global society in climate action


As nations work towards achieving the UN Global Goals, fostering international collaboration is essential. Organisations such as the Global Society play a crucial role in connecting researchers, policymakers, and industries to accelerate the adoption of clean technologies. By promoting education and innovation, these entities contribute to a shared vision of a greener, more equitable future.


The path ahead


Japan's advancements in hydrogen fuel technology highlight the intersection of science, environmental protection, and economic opportunity. While challenges remain—such as improving efficiency and scaling production—this breakthrough represents a significant step towards achieving global sustainability. The continued collaboration of governments, organisations, and scientists worldwide is critical to realising the potential of clean hydrogen fuel and ensuring a future built on resilience and innovation.


For further reading on global efforts in hydrogen energy and sustainable development, explore resources from the International Renewable Energy Agency (IRENA) and the United Nations Sustainable Development Goals portal.

 

 

 


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