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Large-scale and clean preparation of low-defect few-layered graphene from commercial graphite via hydroxyl radical exfoliation in an acidic medium
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-10-13 , DOI: 10.1039/d1re00289a Wenqiao Du 1 , Zaiqian Yu 1 , Xin Wang 2 , Jingdong Wu 1 , Long Zhang 1
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-10-13 , DOI: 10.1039/d1re00289a Wenqiao Du 1 , Zaiqian Yu 1 , Xin Wang 2 , Jingdong Wu 1 , Long Zhang 1
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Graphene has been verified as one of the most promising nanomaterials for an extensive range of applications, and large-scale, clean and cost-effective preparation of low-defect graphene is still a major challenge both in academia and industry until now. In this work, a novel hydroxyl radical exfoliation method of commercial graphite into graphene at the kg scale for each run was achieved in an acidic medium in the presence of potassium formate and polyaspartic acid solution serving as an electrical conductor and exfoliation assistant. Then, a systematic investigation was conducted to explore the optimal crucial parameters with respect to the exfoliation efficiency of the proposed technology and the quality evaluation of the resulting graphene products. At the optimal process parameters, in which the applied current density was 0.056 A m−2, the air flow rate was 1.0 L min−1, the mass ratio of potassium formate, polyaspartic acid and water was 30 : 9 : 61, the mass ratio of the binary assistant solution to graphite was 10 : 3 and the exfoliation time was 3 h, the highest yield of the graphene product reached 98.2%. Furthermore, the prepared graphene product has quite low defects and the percentage of 2-layer graphene in the product was as high as 92%. The graphene preparation process is clean and operated at room temperature, with only air and electricity consumption, and the binary components solution recycling usage, and without any aggressive agents employed and the graphite and the assistants used were all industrially available. Therefore, this cost-effective strategy is practically promising for large-scale preparation of higher quality graphene from low-cost commercial graphite.
中文翻译：
在酸性介质中通过羟基自由基剥离从商业石墨大规模清洁制备低缺陷少层石墨烯
石墨烯已被证实是最有前途的纳米材料之一，具有广泛的应用前景，而大规模、清洁和经济高效地制备低缺陷石墨烯仍然是学术界和工业界的一大挑战。在这项工作中，在甲酸钾和聚天冬氨酸溶液作为电导体和剥离助剂的存在下，在酸性介质中实现了一种新的羟基自由基剥离方法，将商业石墨以千克规模为石墨烯。然后，进行了系统研究，以探索与所提出技术的剥离效率和所得石墨烯产品的质量评估相关的最佳关键参数。在最佳工艺参数下，其中施加的电流密度为 0.056 A m-2 , 空气流量为 1.0 L min -1,甲酸钾、聚天冬氨酸和水的质量比为30:9:61，二元助剂溶液与石墨的质量比为10:3，剥离时间为3h，石墨烯产物最高收率达到98.2 %。此外，所制备的石墨烯产品缺陷非常低，产品中2层石墨烯的比例高达92%。石墨烯制备过程清洁，常温下操作，仅消耗空气和电力，二元组分溶液循环使用，不使用任何侵蚀剂，所用石墨和助剂均为工业可得。因此，这种具有成本效益的策略对于从低成本商业石墨大规模制备更高质量的石墨烯具有实际前景。
更新日期：2021-11-16
中文翻译：
在酸性介质中通过羟基自由基剥离从商业石墨大规模清洁制备低缺陷少层石墨烯
石墨烯已被证实是最有前途的纳米材料之一，具有广泛的应用前景，而大规模、清洁和经济高效地制备低缺陷石墨烯仍然是学术界和工业界的一大挑战。在这项工作中，在甲酸钾和聚天冬氨酸溶液作为电导体和剥离助剂的存在下，在酸性介质中实现了一种新的羟基自由基剥离方法，将商业石墨以千克规模为石墨烯。然后，进行了系统研究，以探索与所提出技术的剥离效率和所得石墨烯产品的质量评估相关的最佳关键参数。在最佳工艺参数下，其中施加的电流密度为 0.056 A m-2 , 空气流量为 1.0 L min -1,甲酸钾、聚天冬氨酸和水的质量比为30:9:61，二元助剂溶液与石墨的质量比为10:3，剥离时间为3h，石墨烯产物最高收率达到98.2 %。此外，所制备的石墨烯产品缺陷非常低，产品中2层石墨烯的比例高达92%。石墨烯制备过程清洁，常温下操作，仅消耗空气和电力，二元组分溶液循环使用，不使用任何侵蚀剂，所用石墨和助剂均为工业可得。因此，这种具有成本效益的策略对于从低成本商业石墨大规模制备更高质量的石墨烯具有实际前景。
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