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Two-dimensional tin selenide nanostructures for flexible all-solid-state supercapacitors.

Chunli Zhang1, Huanhuan Yin, Min Han

  • 1Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University , Nanjing 210023, People's Republic of China.

ACS Nano
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Summary

Phase-controlled synthesis of 2D tin selenide nanostructures was achieved for the first time, enabling high-performance flexible supercapacitors. Tin selenide nanostructures demonstrate promising potential for energy storage applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Tin selenide (SnSe) nanostructures possess unique electronic and optoelectronic properties, making them promising for energy storage and photovoltaic devices.
  • Controlled synthesis of two-dimensional (2D) tin selenide nanostructures is challenging, and their application in supercapacitors remains unexplored.
  • Existing energy storage materials like graphene and TiN mesoporous spheres have limitations in performance and flexibility.

Purpose of the Study:

  • To achieve phase-controlled synthesis of 2D tin selenide nanostructures for the first time.
  • To investigate the pseudocapacitive behavior of different tin selenide phases.
  • To fabricate and evaluate flexible, all-solid-state supercapacitors using synthesized tin selenide nanostructures.

Main Methods:

  • Synthesized 2D tin selenide nanostructures (SnSe2 nanodisks, mixed-phase SnSe-SnSe2 nanodisks, SnSe nanosheets) using SnCl2, trioctylphosphine (TOP)-Se, borane-tert-butylamine complex (BTBC), and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone.
  • Controlled phase synthesis by adjusting the amount of BTBC, leveraging the interplay of TOP and BTBC.
  • Fabricated flexible, all-solid-state supercapacitors using pure SnSe2 nanodisks and pure SnSe nanosheets.

Main Results:

  • Achieved phase-controlled synthesis of 2D tin selenide nanostructures (SnSe2 NDs, SnSe NSs) by tuning BTBC concentration.
  • Observed phase-dependent pseudocapacitive behavior with high specific capacitances: SnSe2 NDs (168 F g⁻¹) and SnSe NSs (228 F g⁻¹).
  • Supercapacitor devices exhibited high areal capacitances, good cycling stability, excellent flexibility, and mechanical stability, outperforming many reported solid-state devices.

Conclusions:

  • The developed method enables the first-ever phase-controlled synthesis of 2D tin selenide nanostructures.
  • Tin selenide nanostructures, particularly SnSe2 nanodisks, show significant promise as active materials for high-performance, flexible, all-solid-state supercapacitors.
  • The findings open new avenues for advanced energy storage applications using tailored tin selenide nanomaterials.