Scientists replace costly membranes with durable diaphragms that turn waste carbon into energy-rich compounds.
Turning waste carbon into useful materials is a growing focus in the push toward sustainable and circular manufacturing.As industries seek ways to reduce emissions while maintaining productivity, scientists are developing systems that can recycle carbon dioxide into valuable compounds, rather than letting it escape into the atmosphere.
One promising route involves converting carbon dioxide into carbon monoxide, which can then be transformed into fuels and chemicals using electricity from renewable sources.However, these systems often face a major limitation. The devices that perform this conversion typically use anion exchange membranes, which are prone to degradation when exposed to organic materials.Over time, these membranes weaken and lose efficiency, making large-scale carbon recycling costly and less practical.A research team led by Feng Jiao, the Lauren and Lee Fixel Distinguished Professor in the McKelvey School of Engineering at Washington University in St. Louis, has identified a more durable and affordable alternative.They found that porous materials, known as diaphragms, can replace these fragile polymer-based membranes in the carbon monoxide conversion process without compromising performance.The team explored how diaphragms, which are inexpensive and robust porous separators, could handle the demanding conditions of carbon dioxide conversion.Their goal was to find materials that would maintain long-term efficiency while preventing unwanted crossover between gases produced at the cathode and anode.After testing a range of diaphragm materials, the researchers discovered that several performed as well or better than existing commercial membranes in various operating environments.The results showed that diaphragms not only offer comparable conversion efficiency but also greater resistance to degradation over extended use.This finding opens the door to more stable and cost-effective systems for turning waste gases into useful chemical feedstocks, a key requirement for sustainable manufacturing.Diaphragm design shows staying powerJiao’s team developed a diaphragm-based carbon monoxide electrolyzer using Zirfon, a commercial diaphragm product that contains zirconium dioxide.When operated at 60 degrees Celsius, the Zirfon-based electrolyzer maintained high efficiency for over 250 hours, while the best commercial membranes typically lasted approximately 150 hours under similar conditions.In a scaled-up experiment, the Zirfon electrolyzer ran steadily for 700 hours, demonstrating strong potential for industrial applications.“These results show that diaphragms can be a scalable and durable solution for carbon monoxide conversion, making the process cheaper and more compatible with renewable energy sources,” said Jiao, who is also director of the Center for Carbon Management and associate director of the National Science Foundation CURB Engineering Research Center.Toward scalable carbon conversionThe researchers view their work as a significant step toward creating closed-loop manufacturing systems where waste gases are continuously captured and reused.By reducing the cost and improving the durability of carbon conversion devices, diaphragm-based designs could make renewable-powered carbon recycling commercially viable.Jiao’s lab plans to refine its electrolysis technologies further, aiming to enhance energy efficiency and system stability.A more efficient conversion process would accelerate progress toward carbon-neutral manufacturing and reduce industrial dependence on fossil-based raw materials.By replacing fragile polymer membranes with strong, affordable diaphragms, Jiao’s team has provided a practical path forward for scaling up carbon conversion systems.Their work demonstrates that sustainable manufacturing can be both cost-effective and durable, aligning environmental responsibility with industrial feasibility.The study is published in the journal Nature Communications.
Carbon Recycling Circular Economy Clean Energy Clean Technology Diaphragms Electrolyzer
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