Thermogalvanic Refrigeration Promises Some Very Cool Lower-Energy Cooling

A novel approach using thermogalvanic cells could boost lab cooling efficiency and sustainability, transforming fridges and freezers in research settings.

• New study reports improved thermogalvanic cell design, offering enhanced cooling performance
• Potential applications include more efficient lab fridges and freezers with reduced energy consumption
• Researchers emphasise future commercial viability and ongoing design improvements

Laboratories across the UK rely on precision refrigeration to store sensitive materials—from biological samples to temperature-critical chemicals. Maintaining these environments, however, involves significant energy consumption and can come with sizeable environmental costs. A recent report in the journal Joule highlights advances in thermogalvanic refrigeration technology, suggesting it could soon become a viable option for powering fridges and freezers with lower energy input and a reduced ecological footprint.

A Reversible Approach to Low-Energy Cooling

Thermogalvanic cells function by harnessing heat from electrochemical reactions to create electricity. By reversing this process, researchers have found that cooling can be generated when an external current drives specific reactions. In the new study, a team from Huazhong University of Science and Technology in Wuhan, China, built on earlier research to dramatically enhance the cooling potential of thermogalvanic cells. They achieved this by fine-tuning the solutes and solvents in the electrolyte solution, ultimately producing cooling performance that could be a real contender for traditional laboratory refrigeration systems.

“Thermogalvanic technology is on its way to our lives, either in the form of clean electricity or low-power cooling, and both research and commercial communities should be paying attention,” says senior author Jiangjiang Duan. Researchers in this study used a reversible process centred on iron ions, where the shift from Fe³⁺ to Fe²⁺ absorbs heat, and the reverse reaction releases it. By carefully adjusting the composition of the iron-containing electrolytes, they reported a 70% improvement in cooling power compared to earlier attempts.

The cooling capacity reached 1.42 K in the surrounding solution—far higher than the 0.1 K figures cited in previous thermogalvanic research. This leap in performance strongly indicates the technology’s potential for practical applications, including lab fridges and freezers that must maintain precise temperature ranges. Notably, the report points out that thermogalvanic refrigeration may require significantly less energy than conventional systems, lowering costs and environmental impact.

“While previous studies mostly focus on original system design and numerical simulation, we report a rational and universal design strategy of thermogalvanic electrolytes, enabling a record-high cooling performance that is potentially available for practical application,” says Duan.

Potential Impact on Laboratory Refrigeration

In research environments, refrigeration is essential for preserving biological samples, reagents, and other materials whose integrity hinges on stable, controlled temperatures. As labs increasingly prioritise sustainable solutions, thermogalvanic refrigeration could fill a pressing need by offering a method that is both cost-effective and lower in emissions.

Another key benefit is scalability. Because thermogalvanic cells can be made compact, they could be adapted for everything from benchtop fridges to large walk-in cold rooms, reducing both carbon footprints and operational costs. If commercialisation efforts are successful, labs might install thermogalvanic-based freezers that consume far less electricity and produce fewer greenhouse gases than current refrigeration models.

“Though our advanced electrolyte is commercially viable, further efforts in the system-level design, scalability, and stability are required to promote the practical application of this technology,” Duan explains. Future improvements to the underlying chemistry and device architecture could push performance even further, potentially giving labs across various scientific fields an option that aligns with both financial and environmental objectives.

“In the future, we aim to continuously improve the thermogalvanic cooling performance by exploring novel mechanisms and advanced materials. We are also attempting to develop diverse refrigerator prototypes towards potential application scenarios and are seeking to collaborate with innovation companies to promote commercialization of thermogalvanic technologies,” says Duan. Such developments would not only advance cooling technology but also contribute to the growing portfolio of energy-efficient solutions needed in modern research settings.