Compressible sponge electrodes by oxidative molecular layer deposition (oMLD) of polyethylenedioxythiophene (PEDOT) onto open-cell polyurethane sponges
Compressible sponge electrodes by oxidative molecular layer deposition (oMLD) of polyethylenedioxythiophene (PEDOT) onto open-cell polyurethane sponges
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DOI：
10.1088/1361-6528/acef2b
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发表时间：
2023-08
期刊：
影响因子：
3.5
通讯作者：
Mahya Mehregan;D. Stalla;Gabe Luebbert;Lauren Baratta;Katrina G. Brathwaite;Quinton K. Wyatt;Nikhila C Paranamana;M. Young
中科院分区：
文献类型：
--
作者：
Mahya Mehregan;D. Stalla;Gabe Luebbert;Lauren Baratta;Katrina G. Brathwaite;Quinton K. Wyatt;Nikhila C Paranamana;M. Young
可压缩多孔海绵电极的形成对于克服多孔电极中的扩散限制具有吸引力，所述多孔电极用于包括电化学能量储存、电化学水脱盐和电催化的应用。先前的工作已经采用湿化学合成将导电材料递送到多孔聚合物海绵支撑体中，但是这些方法难以产生功能电极，这是由于（1）导电网络的不良电连接性和（2）涂覆后泡沫的机械刚性。在这项工作中，我们采用氧化分子层沉积（oMLD）通过连续的气相暴露的3，4-乙撑二氧噻吩（EDOT）和五氯化钼（MoCl 5）氧化剂吸收聚氨酯（PU）海绵导电和氧化还原活性聚（3，4-乙撑二氧噻吩）（PEDOT）涂层。我们分析了oMLD沉积在压缩PU海绵上，并修改反应条件以获得机械可压缩和导电的海绵电极。我们特别确定了MoCl 5剂量时间对增强海绵导电性的重要性以及EDOT清洗时间对保持海绵机械性能的重要性。控制这些变量在海绵载体内产生导电PEDOT网络，对海绵的机械性能的影响降低，提供优于湿化学合成方法的优点。我们生产的可压缩导电海绵有可能用作水淡化，能量储存和电催化的可压缩电极。
The formation of compressible porous sponge electrodes is appealing to overcome diffusion limitations in porous electrodes for applications including electrochemical energy storage, electrochemical water desalination, and electrocatalysis. Previous work has employed wet chemical synthesis to deliver conductive materials into porous polymer sponge supports, but these approaches struggle to produce functional electrodes due to (1) poor electrical connectivity of the conductive network and (2) mechanical rigidity of the foam after coating. In this work we employ oxidative molecular layer deposition (oMLD) via sequential gas-phase exposures of 3,4 ethylenedioxythiophene (EDOT) and molybdenum pentachloride (MoCl5) oxidant to imbibe polyurethane (PU) sponges with electrically-conductive and redox-active poly(3,4 ethylenedioxythiophene) (PEDOT) coatings. We analyze the oMLD deposition on compressive PU sponges and modify the reaction conditions to obtain mechanically compressible and electrically conductive sponge electrodes. We specifically identify the importance MoCl5 dose time to enhance the conductivity of the sponges and the importance of EDOT purge time to preserve the mechanical properties of the sponges. Controlling these variables produces an electrically conductive PEDOT network within the sponge support with reduced impact on the sponge’s mechanical properties, offering advantages over wet-chemical synthesis approaches. The compressible, conductive sponges we generate have the potential to be used as compressible electrodes for water desalination, energy storage, and electrocatalysis.