Inherent Impurities in Graphene/Polylactic Acid Filament Strongly Influence on the Capacitive Performance of 3D-Printed Electrode
Inherent Impurities in Graphene/Polylactic Acid Filament Strongly Influence on the Capacitive Performance of 3D-Printed Electrode
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DOI：
10.1002/chem.202004250
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发表时间：
2020-11-09
影响因子：
4.3
通讯作者：
Pumera, Martin
中科院分区：
文献类型：
--
作者：
Ghosh, Kalyan;Ng, Siowwoon;Pumera, Martin
增材制造或3D打印已经成为电化学能量存储应用领域（例如超级电容器和电池）中有前途的制造技术。最近，市售的石墨烯/聚乳酸（PLA）细丝已被普遍用于超级电容器和锂离子电池的电极制造中的熔融沉积成型（FDM）3D打印。这种石墨烯/PLA长丝含有金属基杂质，如氧化钛和氧化铁。在这项研究中，我们展示了石墨烯/PLA长丝中固有杂质对超级电容器应用的强烈影响。制备3D打印电极，随后进行热活化以进行电化学测量。已经深入了解了金属基杂质的赝电容贡献，这显著提高了3D打印石墨烯/PLA电极的总电容。已经示出了从印刷电极去除杂质的系统方法。这对3D打印复合材料电容的解释具有广泛的影响。
Additive manufacturing or 3D-printing have become promising fabrication techniques in the field of electrochemical energy storage applications such as supercapacitors, and batteries. Of late, a commercially available graphene/polylactic acid (PLA) filament has been commonly used for Fused Deposition Modeling (FDM) 3D-printing in the fabrication of electrodes for supercapacitors and Li-ion batteries. This graphene/PLA filament contains metal-based impurities such as titanium oxide and iron oxide. In this study, we show a strong influence of inherent impurities in the graphene/PLA filament for supercapacitor applications. A 3D-printed electrode is prepared and subsequently thermally activated for electrochemical measurement. A deep insight has been taken to look into the pseudocapacitive contribution from the metal-based impurities which significantly enhanced the overall capacitance of the 3D-printed graphene/PLA electrode. A systematic approach has been shown to remove the impurities from the printed electrodes. This has a broad implication on the interpretation of the capacitance of 3D-printed composites.