Redox Active Colloids as Discrete Energy Storage Carriers
Redox Active Colloids as Discrete Energy Storage Carriers
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DOI：
10.1021/jacs.6b06365
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发表时间：
2016-10-12
影响因子：
15
通讯作者：
Rodriguez-Lopez, Joaquin
中科院分区：
文献类型：
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作者：
Montoto, Elena C.;Nagarjuna, Gavvalapalli;Rodriguez-Lopez, Joaquin
与一系列电极配置和电池设计兼容的通用且容易获得的电池材料对于可再生能量存储是期望的。在这里，我们报告了一类基于氧化还原活性胶体（RAC）的有前途的材料，这些材料在设计上具有固有的模块化，并克服了电池应用中小分子有机材料所面临的挑战，例如交叉和化学/形态稳定性。RAC是交联的聚合物球体，合成时具有80至800 nm的均匀直径，并且作为单颗粒、单层膜和可流动分散体的形式表现出可逆的氧化还原活性。紫罗精为基础的RAC显示可逆循环，访问高达99%的容量和99 +/- 1%的库仑效率超过SO循环，由于大量电解有效的，长距离的粒子内电荷转移。基于二茂铁的RAC与基于紫精的RAC配对在采用简单的尺寸选择性隔膜的非水氧化还原液流电池中有效地循环，从而证明了受益于其胶体尺寸的可能的应用。RAC合成和电化学设计中前所未有的多功能性为能量存储开辟了新的途径。
Versatile and readily available battery materials compatible with a range of electrode configurations and cell designs are desirable for renewable energy storage. Here we report a promising class of materials based on redox active colloids (RACs) that are inherently modular in their design and overcome challenges faced by small-molecule organic materials for battery applications, such as crossover and chemical/morphological stability. RACs are cross-linked polymer spheres, synthesized with uniform diameters between 80 and 800 nm, and exhibit reversible redox activity as single particles, as monolayer films, and in the form of flowable dispersions. Viologen-based RACs display reversible cycling, accessing up to 99% of their capacity and 99 +/- 1% Coulombic efficiency over SO cycles by bulk electrolysis owing to efficient, long-distance intraparticle charge transfer. Ferrocene-based RACs paired with viologen-based RACs cycled efficiently in a nonaqueous redox flow battery employing a simple size-selective separator, thus demonstrating a possible application that benefits from their colloidal dimensions. The unprecedented versatility in RAC synthetic and electrochemical design opens new avenues for energy storage.