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Feeding silkworms with HPMC dispersed MoO2 NPs: An efficient strategy to enhance the supercapacitance performance of carbonized silk
Composites Science and Technology ( IF 9.1 ) Pub Date : 2021-09-03 , DOI: 10.1016/j.compscitech.2021.109025
Jianwei Liang 1 , Xiaoning Zhang 1 , Yansong Ji 1 , Zhenyu Chen 1 , Michael L. Norton 2 , Yixuan Wang 1 , Chi Yan 1 , Xi Zheng 1 , Yong Zhu 1 , Guotao Cheng 1
Affiliation  

It was found in our previous study that feeding silkworms with MoO2 nanoparticles (NPs) as a food additive enabled the incorporation of MoO2 NPs into the as-spun silk, which, in turn, can be used to build electrodes for energy storage. However, aggregation of the MoO2 NPs was observed at high fractional feeding dosages. In order to disperse the MoO2 NPs in fibrous silk and enhance the specific capacitance of the carbonized silk more effectively, a 0.5% (w/v) hydroxypropyl methyl cellulose (HPMC) solution was utilized as the dispersant in this work. Transmission electron microscopy (TEM) results confirmed that HPMC increased the separation of MoO2 nanoparticles incorporated within the silk matrix. Furthermore, the electrochemical performance was characterized, revealing that the specific capacitance of carbonized silk from this HPMC-MoO2 NP feeding group reached 456 F/g, compared to the value of 245 F/g from the previous study, at a current density of 0.2 A/g, demonstrating a significant improvement. The feasibility of utilizing HPMC to maintain the segregated state of MoO2 NPs throughout all stages of silk encapsulation, with negligible impact of this feeding regimen on the growth of silkworms, is demonstrated in this work.



中文翻译:

用 HPMC 分散的 MoO2 NPs 喂养蚕:提高碳化丝超级电容性能的有效策略

在我们之前的研究中发现,用 MoO 2纳米粒子 (NPs) 作为食品添加剂喂养蚕可以将 MoO 2 NPs 结合到初纺丝中,进而可用于构建用于能量存储的电极。然而,在高分次进料剂量下观察到MoO 2 NPs 的聚集。为了将 MoO 2 NPs分散在纤维丝中并更有效地提高碳化丝的比电容,本工作采用 0.5% (w/v) 羟丙基甲基纤维素 (HPMC) 溶液作为分散剂。透射电子显微镜 (TEM) 结果证实 HPMC 增加了 MoO 2的分离纳米粒子并入丝绸基质中。此外,对电化学性能进行了表征,表明该 HPMC-MoO 2 NP 喂养组的碳化丝的比电容达到了 456 F/g,而之前研究的值为 245 F/g,电流密度为0.2 A/g,显示出显着改善。在这项工作中证明了利用 HPMC在蚕丝封装的所有阶段保持 MoO 2 NPs分离状态的可行性,这种喂养方案对蚕生长的影响可以忽略不计。

更新日期:2021-09-08
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