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<p>Recent advancements in assembling graphene into 3D structures have attracted significant attention due to their high surface area, excellent conductivity, and remarkable specific capacitance for energy storage applications. This study presents the synthesis of a novel graphene aerogel (GA)/carbon nanotube (CNT)/thiourea (Tu) composite via a mild chemical reduction method using ascorbic acid as a green reducing agent. In this composite, Tu acts as both a co-reducing <i>and</i> N/S co-doping agent, while CNTs function as cross-linking and conductivity-enhancing components. The optimized mass ratio of GO:CNT:Tu at 4:1:2 yields a high specific capacitance of 339 F·g⁻<sup>1</sup> at 0.5 A·g⁻<sup>1</sup> and a minimal IR drop of 0.02 V. Furthermore, the composite exhibits excellent cycling stability, with 82% capacitance retention after 5000 charge–discharge cycles at 2 A·g⁻<sup>1</sup>. This novel synthesis strategy and material design offer a promising, sustainable approach for developing high-performance supercapacitor electrodes.</p> Graphical abstract <p></p>

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Synthesis of graphene aerogel/carbon nanotube/thiourea composite by mild chemical reduction method in order to enhance the electrochemical properties

  • 期刊论文

  • 发表日期：

    2025年6月16日

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  • Arash Ghazitabar,
  • Fahimeh Gholami,
  • Malek Naderi,
  • Sara Shateri,
  • Mozhgan Falahaty Marvast

摘要

Recent advancements in assembling graphene into 3D structures have attracted significant attention due to their high surface area, excellent conductivity, and remarkable specific capacitance for energy storage applications. This study presents the synthesis of a novel graphene aerogel (GA)/carbon nanotube (CNT)/thiourea (Tu) composite via a mild chemical reduction method using ascorbic acid as a green reducing agent. In this composite, Tu acts as both a co-reducing and N/S co-doping agent, while CNTs function as cross-linking and conductivity-enhancing components. The optimized mass ratio of GO:CNT:Tu at 4:1:2 yields a high specific capacitance of 339 F·g⁻1 at 0.5 A·g⁻1 and a minimal IR drop of 0.02 V. Furthermore, the composite exhibits excellent cycling stability, with 82% capacitance retention after 5000 charge–discharge cycles at 2 A·g⁻1. This novel synthesis strategy and material design offer a promising, sustainable approach for developing high-performance supercapacitor electrodes.

Graphical abstract