As the world shifts to renewable energy and reduces the use of fossil fuels, the power sector is undergoing rapid change globally. However, a major barrier to generating electricity from wind and solar energy is their uninterrupted nature due to unfavorable environmental conditions. To solve this problem, storage in hydrogen batteries was discovered. But these too were affected by poor performance and required massive space to build, thus complicating heat management. Now, researchers at a Japanese company say they have found a way to make renewable energy more efficient.
An alternative system proposed by Tokyo Tech researchers uses carbon as an energy source instead of hydrogen. This is called a “carbon / air secondary battery (CASB)” and consists of solid-oxide fuels and electrolysis cells (SOFC / ECs), where carbon dioxide (CO2) is oxidized with air to generate carbon energy from electrolysis. To create an energy saving system, SOFCs / ECs can be supplied with compressed liquefied CO2.
In their research, published in the journal Power Sources, the researchers said that the CASB system integrates CO2 electrolysis into C charging and carbon fuel cell power generation.
They claimed to be the first to demonstrate repeated power generation (10 charge-discharge cycles) with Boudouard balance without degradation. The CASB system was able to use most of the carbon deposited on the electrode for power generation, with a maximum coulomb efficiency of 84 percent, a charge-discharge capacity of 38 percent, and an electrical density of 80 mW cm − 2 at 800 செல் C and 100 mA cm − 2.
This suggested that the test of the CASB system did not meet the decay of the fuel electrode. Charge-discharge cycle is an indicator of battery performance.
“Like a battery, CASB is charged using energy generated by renewable sources to reduce CO2 to C. At the next discharge stage, C is oxidized to generate energy,” said Manabu Ihara, a professor at Tokyo Tech. .
This research holds great promise for accelerating the world towards renewable energy.