A Safe Flexible Self-Powered Wristband System by Integrating Defective MnO<sub>2-<i>x</i></sub> Nanosheet-Based Zinc-Ion Batteries with Perovskite Solar Cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 34037383.
- Also identified by DOI 10.1021/acsnano.1c03341.
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Abstract
The booming market of portable and wearable electronics has aroused the requests for advanced flexible self-powered energy systems featuring both excellent performance and high safety. Herein, we report a safe, flexible, self-powered wristband system by integrating high-performance zinc-ion batteries (ZIBs) with perovskite solar cells (PSCs). ZIBs were first fabricated on the basis of a defective MnO<sub>2-<i>x</i></sub> nanosheet-grown carbon cloth (MnO<sub>2-<i>x</i></sub>@CC), which was obtained <i>via</i> the simple lithium treatment of the MnO<sub>2</sub> nanosheets to slightly expand the interlayer spacing and generate rich oxygen vacancies. When used as a ZIB cathode, the MnO<sub>2-<i>x</i></sub>@CC with a ultrahigh mass loading (up to 25.5 mg cm<sup>-2</sup>) exhibits a much enhanced specific capacity (3.63 mAh cm<sup>-2</sup> at current density of 3.93 mA cm<sup>-2</sup>), rate performance, and long cycle stability (no obvious degradation after 5000 cycles) than those of the MnO<sub>2</sub>@CC. Importantly, the MnO<sub>2-<i>x</i></sub>@CC-based quasi-solid-state ZIB not only achieves excellent flexibility and an ultrahigh energy density of 5.11 mWh cm<sup>-2</sup> (59.42 mWh cm<sup>-3</sup>) but also presents a high safety under a wide temperature range and various severe conditions. More importantly, the flexible ZIBs can be integrated with flexible PSCs to construct a safe, self-powered wristband, which is able to harvest light energy and power a commercial smart bracelet. This work sheds light on the development of high-performance ZIB cathodes and thus offers a good strategy to construct wearable self-powered energy systems for wearable electronics.