Flexible supercapacitors (SCs) have become a popular research topic due to their extra-long service life, foldability, and wearability. Nevertheless, their low energy density restricts their applications. Here, we synthesized phosphorus-doped bimetallic sulfides embedded in heteroatom-doped (N, S, and P) carbon shells (P-ZCS/HC) using a simple approach to create high-performance flexible electrodes. The three-dimensional architecture made by interlaced nanosheets was preserved, and raised nanoparticles appeared on the rough surface during the annealing operation, increasing the specific surface area and potential exposure to the electrolyte. It is noteworthy that the optimal P-ZCS/HC electrode possessed a remarkable capacity of 1080 C g−1 at 1 A g−1 along with superb cycling stability. These extraordinary properties were primarily caused by plentiful redox reactions, enhanced conductivity, and synergic effects of the P-doped metal sulfides and heteroatom-doped carbon shells. Density functional theory simulations confirmed the good function of the P-doped electrodes and their ability to boost conductivity, improve reactive dynamics, and promote OH− adsorption. Notably, the assembled all-solid-state hybrid SC exhibited a maximum energy density of 62.9 W h kg−1 and a power density of 16 kW kg−1, while being able to maintain 92.0% of its initial capacity after 10,000 cycles. This systematic report provides new insight into the design and synthesis of electrodes with complex components and outstanding structures for the flexible energy field.
|Translated title of the contribution||Phosphorous-doped bimetallic sulfides embedded in heteroatom-doped carbon nanoarrays for flexible all-solid-state supercapacitors|
|Original language||Chinese (Traditional)|
|Journal||Science China Materials|
|Number of pages||15|
|Publication status||Published - 2021|
Bibliographical noteFunding Information:
This work was supported by research projects from the Department of Science and Technology of Shandong Province (2018JMRH0211, ZR2019MEM052, 2019TSLH0101 and ZR2018ZB0105), and the Fundamental Research Funds of Shandong University (2017JC042 and 2017JC010). Jun Lou was supported by a Welch Foundation grant (C-1716).
© 2021, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.
- DFT calculations
- metal sulfides
- phosphorus doping