Hong Kong scientists have designed a redox flow battery with electrolytes based on zinc and cerium. They claim to have solved the incompatibility problem posed by these two elements. The device achieved a record average Coulomb efficiency of 94% during the cycle.

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Researchers from the City University of Hong Kong have developed a redox flow battery (RFB) based on zinc (Zn) and cerium (Ce) based electrolytes which they believe could be an ideal solution for renewable energy storage, due to its flexibility Design.

“The Zn-Ce flow battery has the advantages of moderate cost and high energy density, but suffers from low efficiency,” said researcher Walid Daoud. photo magazine, noting that the devices typically have a lifespan of only a few cycles. “Thus, we proposed a new cell design to improve its efficiency and stability.”

The battery has two membranes to separate incompatible ions from the two electrolytes. This setup allows scientists to assign custom loads carriers at ions compatible with the electrolytes during separation incompatiblethe species. In addition, the design achieves high and stable coulumbic efficiency, while protecting Zn half-cell hydrogen ion poisoning.

“The Ce electrolyte is highly oxidizing, which poses a challenge for anionic membrane stability,” Daoud said. “Thus, the stability and selectivity of the anionic membrane still needs to be improved.”

The device reaches a voltage plateau of 2.3 V at 20 mA cm2energy efficiency of 71.3% at 60 mA cm2and a record average Coulombic Efficiency of 94% during bike.

“This is concluded that the Zn electrolyte with highly reversible Zn plating/scratches and suppressed hydrogen evolution reaction form the basis of high Coulomb efficiency,” the researchers said.

Daoud said that in the future, Zn-Ce RFBS could work effectively in conjunction with PV power generation.

“The system’s design flexibility and safety benefits will open up many opportunities. The battery can be easily scaled to meet the various storage demands of solar power plants,” he said. “These storage systems are promising because of the low cost and abundance of zinc. However, the metallic zinc deposition involved induces challenges, such as limited electrode space for zinc deposition compromising practical energy density versus theoretical energy density, and zinc dendrites can potentially pierce the membrane.

The research group presented the battery technology in “Zn-Ce Flow Battery Rebirth: Dual Diaphragm Configuration Enables Unprecedented Efficiencywhich was recently published in AEC Publications.

This work designs a dual-membrane Zn-Ce RFB for address the incompatibility publish, with who the cell demonstrates stable and reproducible cycling performance, thus reviving the potential of Zn-Ce BFRs as promisingpower-density rechargeable batteries,” the scientists concluded.

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