树叶基前驱体碳热冲击制备乱层石墨烯及其结构演化研究

Study on the Preparation of Turbostratic Graphene from Leaf-Derived Precursors by Carbon Thermal Shock and Its Structural Evolution

摘要: 乱层石墨烯因其层间错位与弱耦合特征而有高化学活性，在储能、电催化及导电网络构建等领域具有良好应用前景。生物质前驱体是制备乱层石墨烯的优秀碳源，具有含碳量高、来源广泛的优点，但现有乱层石墨烯制备方法无法有效将生物质前驱体转化为乱层石墨烯。本文采用碳热冲击技术，利用其毫秒级快速升降温的瞬态热冲击特性，以树叶为前驱体快速制备乱层石墨烯，并研究冲击功率与脉冲频率对产物结构演化的影响。适中的冲击功率有利于降低产物缺陷并提高结晶度，高脉冲频率则有利于减少片层层数。本文为基于生物质的乱层石墨烯的制备提供了新思路，为后续其的大规模可控制备提供了参考。

Abstract: Turbostratic graphene exhibits high chemical reactivity due to its interlayer misalignment and weak interlayer coupling, and thus shows promising application prospects in energy storage, electrocatalysis, and conductive network construction. Biomass precursors are excellent carbon sources for the preparation of turbostratic graphene because of their high carbon content and wide availability; however, existing preparation methods for turbostratic graphene cannot efficiently convert biomass precursors into turbostratic graphene. In this work, carbon thermal shock was employed to rapidly prepare turbostratic graphene using leaves as the precursor by taking advantage of its transient thermal-shock characteristics associated with rapid heating and cooling on the millisecond timescale. The effects of shock power and pulse frequency on the structural evolution of the products were further investigated. A moderate shock power was found to be beneficial for reducing product defects and improving crystallinity, whereas a high pulse frequency was favorable for decreasing the number of graphene layers. This study provides a new approach for the preparation of biomass-based turbostratic graphene, offering a reference for its subsequent large-scale controllable preparation.