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Published on: February 13, 2017
Bio-Inspired Isoalloxazine Redox Moieties for Rechargeable Aqueous Zinc-Ion Batteries
Liwei Cheng1, Yanhong Liang2, Qiaonan Zhu1
1School of Chemistry Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, P. R. China.
Abstract:
Organic electrode materials hold great potential for fabricating sustainable energy storage systems, however, the development of organic redox-active moieties for rechargeable aqueous zinc-ion batteries is still at an early stage. Here, we report a bio-inspired riboflavin-based aqueous zinc-ion battery utilizing an isoalloxazine ring as the redox center for the first time. This battery exhibits a high capacity of 145.5 mAh g-1 at 0.01 A g-1 and a long-life stability of 3000 cycles at 5 A g-1 . We demonstrate that isoalloxazine moieties are active centers for reversible zinc-ion storage by using optical and photoelectron spectroscopies as well as theoretical calculations. Through molecule-structure tailoring of riboflavin, the obtained alloxazine and lumazine molecules exhibit much higher theoretical capacities of 250.3 and 326.6 mAh g-1 , respectively. Our work offers an effective redox-active moiety for aqueous zinc batteries and will enrich the valuable material pool for electrode design.
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