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<p>All-inorganic halide perovskites such as CsPbBr<sub>3</sub> have attracted considerable attention for optoelectronic and energy storage applications due to their excellent light absorption, high photoluminescence quantum yield, and tunable bandgap. However, conventional long-chain amine-based all-inorganic lead halide perovskites often exhibit poor stability and high defect densities due to their dynamic binding nature. In this study, we report the synthesis of amine-free CsPbBr<sub>3</sub> (CPB-WOA)/graphene oxide (GO) composite (CPB-WOA/GO) for electrochemical energy storage applications. CPB-WOA/GO was prepared using a simple, single-step, amine-free hot-injection method under ambient conditions. The use of multi-halide-containing alkanes offers a straightforward and versatile strategy to synthesize stable, amine-free halide perovskite nanocrystals with reduced carbon footprint. Structural and spectroscopic analyses confirmed the successful integration of nanocrystals with GO sheets. Photoluminescence measurements revealed significant emission quenching and a shorter average lifetime (τ<sub>avg</sub> = 8.64&#xa0;ns) compared to pure CPB-WOA (τ<sub>avg</sub> = 35.6&#xa0;ns), indicating efficient charge transfer to GO. The CPB-WOA/GO composites revealed that the specific capacitance of 56.35 F g<sup>−1</sup>, an energy density of 15.24 Wh kg<sup>−1</sup>, and a power density of 80 W kg<sup>−1</sup>. The significantly reduced charge-transfer resistance value of CPB-WOA/GO indicates enhanced interfacial charge transfer and improved electrolyte ion diffusion, which collectively facilitate efficient redox reactions and greater charge accumulation, thereby contributing to its higher specific capacitance. These results highlight that CPB-WOA/GO nanocomposite is a potential candidate for advanced energy storage applications.</p>

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Amine-free CsPbBr3 perovskite/graphene oxide nanocomposite as a potential electrode material for supercapacitor application

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Dinabandhu Patra,
  • Tanuj Kumar,
  • Monojit Bag,
  • Surya Prakash Singh

摘要

All-inorganic halide perovskites such as CsPbBr3 have attracted considerable attention for optoelectronic and energy storage applications due to their excellent light absorption, high photoluminescence quantum yield, and tunable bandgap. However, conventional long-chain amine-based all-inorganic lead halide perovskites often exhibit poor stability and high defect densities due to their dynamic binding nature. In this study, we report the synthesis of amine-free CsPbBr3 (CPB-WOA)/graphene oxide (GO) composite (CPB-WOA/GO) for electrochemical energy storage applications. CPB-WOA/GO was prepared using a simple, single-step, amine-free hot-injection method under ambient conditions. The use of multi-halide-containing alkanes offers a straightforward and versatile strategy to synthesize stable, amine-free halide perovskite nanocrystals with reduced carbon footprint. Structural and spectroscopic analyses confirmed the successful integration of nanocrystals with GO sheets. Photoluminescence measurements revealed significant emission quenching and a shorter average lifetime (τavg = 8.64 ns) compared to pure CPB-WOA (τavg = 35.6 ns), indicating efficient charge transfer to GO. The CPB-WOA/GO composites revealed that the specific capacitance of 56.35 F g−1, an energy density of 15.24 Wh kg−1, and a power density of 80 W kg−1. The significantly reduced charge-transfer resistance value of CPB-WOA/GO indicates enhanced interfacial charge transfer and improved electrolyte ion diffusion, which collectively facilitate efficient redox reactions and greater charge accumulation, thereby contributing to its higher specific capacitance. These results highlight that CPB-WOA/GO nanocomposite is a potential candidate for advanced energy storage applications.