Bio-catalyzed oxidation self-charging zinc-polymer batteries.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38349875.
- Also identified by DOI 10.1073/pnas.2312870121 and PMC identifier 10895261.
- Licence recorded as CC BY-NC-ND.
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Abstract
Oxidation self-charging batteries have emerged with the demand for powering electronic devices around the clock. The low efficiency of self-charging has been the key challenge at present. Here, a more efficient autoxidation self-charging mechanism is realized by introducing hemoglobin (Hb) as a positive electrode additive in the polyaniline (PANI)-zinc battery system. The heme acts as a catalyst that reduces the energy barrier of the autoxidation reaction by regulating the charge and spin state of O<sub>2</sub>. To realize self-charging, the adsorbed O<sub>2</sub> molecules capture electrons of the reduced (discharged state) PANI, leading to the desorption of zinc ions and the oxidation of PANI to complete self-charging. The battery can discharge for 12 min (0.5 C) after 50 self-charging/discharge cycles, while there is nearly no discharge capacity in the absence of Hb. This biology-inspired electronic regulation strategy may inspire new ideas to boost the performance of self-charging batteries.