Amazing stuff! Desperate for better batteries in the age of EVs and robotics! 😊
"Chemists have designed a new kind of flow battery that takes inspiration from biological systems to produce energy from glucose (sugar) with the help of a riboflavin (vitamin B2) catalyst. ...
The team constructed the electrodes from carbon. The anolyte flowing around the anode contained glucose and an active form of riboflavin, which replaced expensive noble metals that would traditionally be used as the catalyst. ..."
From the abstract:
"Glucose as a biofuel offers unique advantages, including low-temperature electricity generation, easy accessibility, low storage cost, and adaptability for on-demand power generation.
Riboflavin, commonly known as Vitamin B2, is a critical component in biological systems, participating in many metabolic reactions as an enzyme cofactor.
Drawing inspiration from these metabolic processes, we demonstrate a flow cell for the electrochemical glucose oxidation reaction (GOR), using riboflavin as an environmentally friendly mediator to replace traditional noble metal catalysts. When pairing with an O2 electrode under alkaline conditions, the glucose flow cell achieves a peak power density of 13 mW/cm2, 20 times greater than the previously reported value under similar conditions.
The demonstrated vitamin-mediated biofuel flow cell introduces a new catalytic design approach for a glucose-based biofuel cell, delivering high peak power density at room temperature and ambient pressure.
This approach ensures low cost and environmental sustainability, eliminating the need for noble metal catalysts."
Graphical abstract
Figure 1.
(A) Schematic drawing of vitamin-mediated glucose oxidation at the negative electrode surface and comparison of other types of glucose oxidation.
(A) Schematic drawing of vitamin-mediated glucose oxidation at the negative electrode surface and comparison of other types of glucose oxidation.
(B) Constant current discharge behavior of 10 mL of riboflavin (0.2 M) and glucose (0.8 M) mixture in 2 M NaOH. The cathode side electrolyte is prepared with 40 mL of 0.4 M ferricyanide in 2 M NaOH. The cutoff voltage is 0.75 V, the discharging current density is 20 mA/cm2, and the flow rate is 40 mL/min.
(C) Enlargement of noncatalytic glucose oxidation on carbon electrode.
(D) Flow cell polarization curve with different resting periods. Negative side: 0.1 M RFP, 0.8 M glucose in 1 M KOH electrolyte (10 mL). Positive side: 0.2 M Ferricyanide in 2 M KOH electrolyte (40 mL).
(E) Enlargement of the system of the OCV with different resting periods. The system configurations of
(F) ferricyanide catholyte coupled RFP/glucose flow cell,
(G) oxygen/manganese(II)-EDTA/ferricyanide hybridized catholyte coupled system, and (H) direct oxygen stream coupled system with ORR catalyst.
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