The power sector is undergoing rapid changes globally as the world moves towards renewable energy and reducing the use of fossil fuels. However, a major obstacle in generating electricity from wind and solar power is their intermittent nature due to unfavorable environmental conditions. Storage in hydrogen batteries was found to solve this problem. But these also suffered from poor efficiency and required large amounts of space to manufacture, which made them complex to thermally manage. Now, researchers at a Japanese institute say they have found a way to make renewable energy more efficient.
An alternative system proposed by researchers at Tokyo Tech uses carbon instead of hydrogen as an energy source. This is called a “carbon/air secondary battery (CASB)” and consists of a solid-oxide fuel and electrolysis cells (SOFC/ECs), where the carbon generated through the electrolysis of carbon dioxide (CO2) is used to generate energy. is oxidised with air. SOFCs/ECs can be supplied with compressed liquefied CO2 to form energy storage systems.
in their research published In the Journal of Power Sources, the researchers said the CASB system combines CO2 electrolysis for Si charging and power generation for carbon fuel cells.
They said they have demonstrated for the first time repetitive power generation (10 charge-discharge cycles) with Baudouard equilibrium without degradation. The CASB system was able to utilize most of the carbon deposited on the electrodes for energy generation, achieving a maximum Coulombic efficiency of 84 percent, a charge-discharge efficiency of 38 percent, and a power density of 80 mW cm at 800 °C and 100 °C. was able to do. MA Semi-2.
This suggested that there was no corrosion of the fuel electrode in the test of the CASB system. The charge-discharge cycle is an indicator of battery performance.
“Similar to batteries, CASBs are charged using energy generated by renewable sources to reduce CO2 to C. During the subsequent discharge phase, C is oxidized to generate energy,” says Tokyo Tech K Prof. Manabu Ihara told in one. Statement,
Research holds great promise for accelerating the world toward renewable energy.