Peptide-Modified Electrode Surfaces for Promoting Anion Exchange Ionomer Microphase Separation and Ionic Conductivity
Peptide-Modified Electrode Surfaces for Promoting Anion Exchange Ionomer Microphase Separation and Ionic Conductivity
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用于促进阴离子交换离聚物微相分离和离子电导率的肽修饰电极表面
DOI：
10.1021/acsmaterialslett.9b00173
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发表时间：
2019
影响因子：
11.4
通讯作者：
Renner, Julie N.
中科院分区：
文献类型：
--
作者：
Su, Zihang;Kole, Subarna;Harden, Leigh C.;Palakkal, Varada M.;Kim, ChulOong;Nair, Greshma;Arges, Christopher G.;Renner, Julie N.
在燃料电池和水电解技术中，离子单体粘结剂是将离子从电催化剂表面输送到电催化剂表面的关键材料。大多数研究将这些材料作为大块聚合物电解质膜进行检查，而相对较少关注它们在电极表面作为薄膜的行为。该报告表明，固定在电极表面的序列定义肽，或溶剂蒸气退火处理，改变了阴离子交换离聚体（AEIs）的微观结构。通过多肽修饰电极或溶剂蒸汽退火获得的中等大小的AEI微相分离离子域，使薄膜平面内离子电导率提高了2 - 3倍。有趣的是，使用肽修饰电极，结合溶剂蒸汽退火，会产生过大的离子颗粒，从而损害离子电导率。总的来说，明智地使用序列定义肽吸附到电极表面，或溶剂蒸气退火，鼓励薄膜AEIs的适当微观结构，从而改善离子电导率。
Ionomer binders are critical materials for delivering ions to and from electrocatalyst surfaces in fuel cell and water electrolyzer technologies. Most studies examine these materials as bulk polymer electrolyte membranes, and comparatively little attention has been given to their behavior on electrode surfaces as thin films. This report demonstrates that sequence-defined peptides anchored to electrode surfaces, or the solvent vapor annealing processing, alters the microstructure configuration of anion exchange ionomers (AEIs). It is observed that moderately sized microphase-separated ionic domains of the AEI, obtained either by peptide-modified electrodes or solvent vapor annealing, give rise to a two- to three-fold increase in thin-film in-plane ionic conductivity. Interestingly, the use of peptide-modified electrodes, in conjunction with solvent vapor annealing, yields excessively large ionic grains that compromise ionic conductivity. Overall, the judicious use of sequence-defined peptides adsorbed to electrode surfaces, or solvent vapor annealing, encourage the appropriate microstructures of thin-film AEIs resulting in ameliorated ionic conductivity.
影响因子：
3.3
作者：
Sambandam, Satheesh;Ramani, Vijay
通讯作者：
Ramani, Vijay
影响因子：
8.6
作者：
Arges, Christopher G.;Kambe, Yu;Nealey, Paul F.
通讯作者：
Nealey, Paul F.
影响因子：
8.6
作者：
Dong, Ban Xuan;Nowak, Christian;Patel, Shrayesh N.
通讯作者：
Patel, Shrayesh N.