Bai Yuge, Yin Yuting, Xuan Yingying, Han Xiaogang
State Key Lab of Electrical Insulation and Power Equipment, Shaanxi Key Laboratory of Smart Grid, Xi'an Jiaotong University, Xi'an, Shaanxi Province, 710049, People's Republic of China.
Nanotechnology. 2021 Jan 22;32(4):045602. doi: 10.1088/1361-6528/abbfd4.
By virtue of its high specific surface area and low tortuosity for ionic storage and transportation, holey graphene has come to be regarded as a promising material for energy storage devices, such as lithium ion batteries, and supercapacitors. For practical applications, a scalable and green preparation method for holey graphene is required. This work proposes a facile preparation method for holey graphene by simply microwaving pristine graphene in air. Compared with previous scalable methods, this method exhibits much greater efficiency, reducing the preparation time from hours to minutes. The mechanism underlying the microwave irradiation-induced formation of nanosized holes involves the interaction between microwaves, electrons, oxygen in air, and carbon atoms in the defect areas of the graphene. The size, density, and distribution of holes can be controlled by tuning the microwave irradiation time and oxygen concentration. Used as a hybrid conductive agent, the as-prepared holey multilayer graphene increases capacitance retention to 96.25% at high current density (8 A g), and 96.48% in long cycles (1 A g and 10 000 cycles).
由于具有高比表面积以及在离子存储和传输方面的低曲折度，多孔石墨烯已被视为用于诸如锂离子电池和超级电容器等储能装置的一种有前景的材料。对于实际应用而言，需要一种可扩展且绿色的多孔石墨烯制备方法。这项工作提出了一种通过在空气中简单地对原始石墨烯进行微波处理来制备多孔石墨烯的简便方法。与先前的可扩展方法相比，该方法效率更高，将制备时间从数小时缩短至数分钟。微波辐射诱导形成纳米尺寸孔洞的机制涉及微波、电子、空气中的氧气以及石墨烯缺陷区域中的碳原子之间的相互作用。孔洞的尺寸、密度和分布可通过调节微波辐射时间和氧气浓度来控制。所制备的多孔多层石墨烯用作混合导电剂时，在高电流密度（8 A g）下电容保持率提高到96.25%，在长循环（1 A g和10,000次循环）中为96.48%。
