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Iron-chromium redox flow battery with high energy density – pv magazine International


Researchers led by UNIST in Korea have developed a brand new idea of redox stream battery that makes use of iron and chromium ore for redox chemistry. The proposed battery configuration may be reported to realize a steady lifetime of 500 cycles, and a excessive vitality density of 38.6 Wh L−1.

A global analysis staff has developed a brand new idea for redox stream batteries that use iron and chromium ore for redox chemistry.

“We’re within the preliminary levels of exploring the financial side of those batteries,” the lead creator of the analysis, Hyun-Wook Lee, mentioned. pv journal. “Whereas we’ve got not but been capable of make a full stage value of storage (LCOS) estimate, our preliminary findings level to potential value competitiveness, particularly given the environmentally pleasant nature of our batteries and their good efficiency metrics.”

The battery depends on a chromium-based damaging electrolyte, or negolyte, and powerful area cyanide ligands, which scientists say can scale back the Jahn-Teller impact. The latter is a geometrical distortion of a non-linear molecular system that reduces its symmetry and vitality and, in redox stream batteries, scale back redox potential, stability, and quick kinetics.

Stopping the undesirable decomposition of the chromium (II) chloride Cr (II) advanced used within the battery is the important thing step to keep away from these points throughout electrochemical biking in redox stream batteries, thus facilitating a robust and quick redox response.

The battery additionally makes use of a negolyte based mostly on hexacyanometalate, an inorganic compound with the method Cr(CN)6. “The dependable electrochemical properties of Cr(CN)6 is exclusive on account of its low redox potential of −1.15 V,” the group defined. The electrolyte relies on sodium cyanide (NaCN), which is claimed to supply one of the best electrochemical stability, particularly in opposition to extremely reductive potential, mixed with excessive solubility in water.

By a sequence of thermodynamic density-functional idea (DFT) simulations, the researchers discovered that negolyte coordinates nicely with the sturdy area ligand used for the battery and is ready to scale back the Jahn-Teller impact.

The proposed battery configuration can obtain a steady lifetime of 500 cycles and a excessive vitality density of 38.6 Wh L-1in accordance with the analysis staff.

“This hexacyanometalate-based redox stream battery can carry out reversible redox reactions with a comparatively excessive potential as an aqueous system exploiting the low potential of Cr(CN)6 and improved biking efficiency at excessive present densities,” it mentioned. “In comparison with typical and different stream batteries, this cell configuration has superior properties when it comes to whole cell potential and biking efficiency.”

The brand new battery idea is offered within the examine “Full-Hexacyanometallate Aqueous Redox Circulation Batteries Above 1.5 V in an Aqueous Answer,” printed in Superior Vitality Supplies. The analysis staff consists of scientists from Nanyang Technological College in Singapore and the Ulsan Nationwide Institute of Science and Know-how (UNIST) in South Korea.

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