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Flexible Electrode Based on MWCNT Embedded in a Cross-Linked Acrylamide/Alginate Blend: Conductivity vs. Stretching

机译：嵌入交联的丙烯酰胺/藻酸酯共混物中的基于MWCNT的柔性电极：电导率与拉伸

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A polyacrylamide-alginate hydrogel electrolyte, blended with Multi-Walled Carbon Nanotubes (MWCNT) as an electronically conductive fraction, allows for the creation of a flexible, durable, and resilient electrode. The MWCNT content is correlated with mechanical characteristics such as stretch modulus, tensile resistance, and electrical conductivity. The mechanical analysis demonstrates tensile strength that is comparable to similar hydrogels reported in the literature, with increasing strength for MWCNT-embedded hydrogels. The impedance spectroscopy reveals that the total resistance of electrodes decreases with increasing MWCNT content upon elongation and that bending and twisting do not obstruct their conductivity. The MWCNT-inserted hydrogels show mixed ionic and electronic conductivities, both within a range of 1–4 × 10 S cm in a steady state. In addition, the thermal stability of these materials increases with incrementing MWCNT content. This observation agrees with long-term charge-discharge cycling that shows enhanced electrochemical durability of the MWCNT-hydrogel hybrid when compared to pure hydrogel electrolyte. The hydrogel-carbon films demonstrate an increased interfacial double-layer current at a high MWCNT content (giving an area-specific capacitance of ~30 mF cm at 2.79 wt.% of MWCNT), which makes them promising candidates as printable and flexible electrodes for lightweight energy storage applications. The maximum content of MWCNT within the polymer electrolyte was estimated at 2.79 wt.%, giving a very elastic polymer electrode with good electrical characteristics.
机译：与多壁碳纳米管（MWCNT）混合的聚丙烯酰胺-藻酸盐水凝胶电解质可作为电子导电成分，从而可创建柔性，耐用且有弹性的电极。 MWCNT含量与机械特性如拉伸模量，抗张强度和电导率相关。力学分析表明，拉伸强度可与文献中报道的类似水凝胶相媲美，而且嵌入MWCNT的水凝胶的强度有所提高。阻抗谱表明，电极的总电阻随着伸长时MWCNT含量的增加而降低，弯曲和扭曲不会阻碍其导电性。插入MWCNT的水凝胶在稳定状态下的混合电导率和电导率均在1-4×10 S cm范围内。另外，这些材料的热稳定性随着MWCNT含量的增加而增加。该观察结果与长期充电-放电循环一致，长期循环显示与纯水凝胶电解质相比，MWCNT-水凝胶杂化物具有增强的电化学耐久性。水凝胶-碳膜在高MWCNT含量下显示出增加的界面双层电流（在MWCNT的2.79 wt。％时具有约30 mF cm的比表面积电容），这使其有希望成为可印刷的柔性电极轻型储能应用。聚合物电解质中MWCNT的最大含量估计为2.79重量％，得到具有良好电特性的非常弹性的聚合物电极。

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