A research team from Southwest University in China, led by Professor Zhou Yang, has developed a cement-based material that can both generate and store electricity. The composite combines traditional cement with a polyvinyl alcohol (PVA) hydrogel, resulting in a material that offers structural integrity and additional functional capabilities. This development may be of interest to professionals working in architecture, interior and landscape design, urban planning, and product development.

Material Composition and Mechanism
The innovation is based on a cement–hydrogel composite that leverages thermoelectric and ionic transport properties. The material uses hydroxide ions (OH⁻), calcium ions (Ca²⁺), and water molecules within a hydrated cement matrix. These elements facilitate ionic conduction, enabling the material to function as a thermoelectric system.

Temperature gradients across the material induce ion movement, converting thermal energy into electrical energy. This mechanism is described as a thermo-ionic effect. The system demonstrated a Seebeck coefficient of approximately –0.45 mV/K and a thermoelectric figure of merit (ZT) around 6.6×10⁻⁴. These values are several times higher than those previously recorded for cement-based thermoelectric materials.

Functional Integration in Infrastructure
In addition to energy generation, the material is also capable of storing electricity, allowing for integration with embedded monitoring systems, sensors, or data collection devices in buildings and infrastructure. Each layer of the composite material contributes to either structural performance or energy functionality, offering potential applications in smart infrastructure.

Examples include use in roads, bridges, or walls where integrated systems for temperature sensing, structural monitoring, or environmental data collection are needed. These applications may support the development of smart cities, in which infrastructure plays an active role in data gathering and communication.

Environmental and Practical Considerations
The composite material was featured during the international SymBitBuild conference session titled Conquering Carbon Emissions from the Concrete Industry, which focused on innovations aimed at reducing the environmental impact of cement and concrete. The researchers suggest that using such multifunctional materials may reduce the need for separate sensor systems and power sources, potentially lowering resource and energy demand in construction projects.

Related research in carbon-absorbing concretes and alternative binders continues to expand the scope of environmentally conscious building materials. The cement–hydrogel composite fits within this broader context of developing materials that support both performance and sustainability goals.

Development Stage and Outlook
The technology is currently in the experimental phase. While further testing is needed to assess long-term performance and scalability, the initial findings indicate potential for applications in infrastructure with integrated energy and data functionalities. The combination of mechanical reliability with functional innovation suggests opportunities for new approaches in urban and architectural design.

Source: TW.nl
Photo: Pixabay