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Reduced graphene oxide-based nanoassemblies for energy storage applications.

机译：用于能量存储应用的减少的基于氧化石墨烯的纳米组件。

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摘要

Reduced graphene oxide provides an alternative route to the use of single-layer graphene in functional devices as a result of its ability to be synthesized and functionalized via solution-based processing in large quantities. Graphene oxide serves as a versatile precursor to reduced graphene oxide by offering unique opportunities to anchor nanostructured materials onto its surface and serve as a 2-D conductive support. The high surface area and excellent conductivity of reduced graphene oxide provide a suitable foundation for shuttling charges to redox-active materials such as those used in lithium ion batteries while maximizing the interfacial contact between the conductor (reduced graphene oxide) and redox-active nanomaterial.;This dissertation first describes the progress in elucidating the fundamental characteristics that drive the enhancements offered to electrode designs incorporating reduced graphene oxide so that more rational designs are possible. The use of reduced graphene oxide as conductive support for active cathode material in lithium ion batteries led to significantly improved electrode kinetics, faster Li+ diffusion to the electrode surface, and increased double layer charging. Further, the strong electrostatic interactions between the electronegative oxygen functional groups inherent to graphene oxide and the transition metal precursors influenced dopant concentration in the active material.;Pivoting from the finding that reduced graphene oxide improves the diffusion of electroactive species, a new graphene morphology, holey graphene, was synthesized that offers potentially further improvement of transport characteristics in energy storage electrodes. Through a catalytic oxidation process, gold nanoparticles and hydroxyl radicals work in tandem to etch holes into reduced graphene oxide sheets in solution. This new approach provides secondary, solution-based control over the reduced graphene oxide morphology, providing a range of opportunities to tune electrode transport characteristics.;Based on the new insights obtained regarding the fundamental role of reduced graphene oxide in improving electrode characteristics in lithium ion batteries, the work described in this dissertation serves as a basis for further exploration of graphene-based nanoassemblies. Finally, the development of a solution-based process for tuning the morphology and degree of oxidation of reduced graphene oxide potentially opens the door to its use in other energy or optoelectronic applications.
机译：还原的氧化石墨烯可以通过基于溶液的工艺进行大量合成和功能化，从而为功能设备中使用单层石墨烯提供了另一种途径。氧化石墨烯是还原型氧化石墨烯的通用前体，它提供了将纳米结构材料固定在其表面上并用作二维导电载体的独特机会。还原的氧化石墨烯的高表面积和出色的电导率为向锂离子电池等氧化还原活性材料穿梭电荷提供了合适的基础，同时又使导体（还原的氧化石墨烯）与氧化还原活性纳米材料之间的界面接触最大化。 ；本论文首先描述了阐明基本特性的进展，这些基本特性推动了对结合了还原氧化石墨烯的电极设计的改进，从而使更合理的设计成为可能。使用还原的氧化石墨烯作为锂离子电池中活性阴极材料的导电载体，可显着改善电极动力学，加快Li +向电极表面的扩散，并增加双层电荷。此外，氧化石墨烯固有的负电性氧官能团与过渡金属前体之间的强静电相互作用影响了活性材料中的掺杂剂浓度。从发现还原的氧化石墨烯改善了电活性物质的扩散这一发现出发，提出了一种新的石墨烯形态，合成了有孔的石墨烯，可以进一步改善储能电极中的传输特性。通过催化氧化过程，金纳米颗粒和羟基自由基协同作用，将孔腐蚀成溶液中还原的氧化石墨烯片。这种新方法为还原的氧化石墨烯形态提供了基于溶液的辅助控制，从而提供了一系列机会来调节电极的传输特性。电池，本文的工作为进一步探索石墨烯基纳米组件奠定了基础。最后，开发基于溶液的方法以调节还原的氧化石墨烯的形态和氧化程度可能为在其他能源或光电应用中使用它打开了大门。

著录项

  • 作者

    Radich, James G.;

  • 作者单位

    University of Notre Dame.;

  • 授予单位 University of Notre Dame.;
  • 学科 Engineering Chemical.
  • 学位 Ph.D.
  • 年度 2014
  • 页码 134 p.
  • 总页数 134
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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