Guwahati: What if sunlight could help transform a climate pollutant into a usable fuel? Researchers at Indian Institute of Technology Guwahati have taken a decisive step in that direction by developing a sunlight-driven catalyst that converts carbon dioxide (CO₂) into methanol—an important liquid fuel and industrial chemical.
The breakthrough comes from a research team led by Prof. Mahuya De of the Department of Chemical Engineering, along with research scholar Nayan Moni Baishya. Their findings have been published in the international journal Journal of Materials Science.
Tackling emissions while creating energy
As the world continues to rely heavily on fossil fuels, carbon dioxide emissions remain one of the biggest drivers of climate change.
Scientists globally are racing to develop technologies that not only reduce CO₂ emissions but also reuse carbon in meaningful ways.
Converting CO₂ into methanol using sunlight is considered one of the most promising pathways toward this goal.
Until now, many such efforts have relied on graphitic carbon nitride—a low-cost, metal-free and environmentally benign material. While attractive, this material suffers from a major drawback: rapid loss of energy, which limits fuel production efficiency.
Graphene makes the difference
To overcome this hurdle, the IIT Guwahati team engineered a hybrid material by combining graphitic carbon nitride with few-layer graphene.
Graphene’s exceptional electrical conductivity and charge-transfer properties help prevent energy loss inside the catalyst, allowing it to stay active for longer under visible light and sunlight.
“Our work demonstrates a way to simultaneously address environmental concerns and green energy generation,” Prof. De said. “Using solar energy to convert carbon dioxide into cleaner fuel is a promising route toward a sustainable future.”
The study found that a catalyst containing 15 weight percent graphene delivered the most efficient CO₂-to-methanol conversion. It also showed strong stability—an essential requirement for real-world applications.
The improved catalyst absorbs light more effectively, generates charges more efficiently, and sustains photocatalytic activity over longer periods compared to earlier materials.
Toward a circular carbon economy
If scaled successfully, the technology could find applications in CO₂-intensive industries such as thermal power plants, cement factories, steel units, and petrochemical refineries—helping convert waste emissions into valuable fuel and supporting a circular carbon economy.
What comes next
The research is currently at the laboratory stage. The team’s next goal is to scale up the process and develop a durable, long-lasting photocatalytic system capable of operating under industrial conditions.
The research described here is at an experimental stage. Further validation is required, and the technology is not yet ready for commercial deployment.
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