3D-Printed Electrodes with Improved Mass Transport Properties
3D-Printed Electrodes with Improved Mass Transport Properties
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DOI：
10.1002/celc.201700662
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发表时间：
2017-12-01
期刊：
影响因子：
4
通讯作者：
Wessling, Matthias
中科院分区：
文献类型：
--
作者：
Loelsberg, Jonas;Starck, Ottokar;Wessling, Matthias
与电催化合成相比，今天的电化学反应器设计是一门欠发达的学科。虽然催化剂的转化率越来越高，但它们的操作往往没有采取措施来减少浓度极化效应。结果，在电极-电解质界面处形成了一个停滞的边界层。这种停滞的边界层产生了额外的电压降，降低了能量效率。人们普遍认为，这种现象是由快速的电极反应和反应物质的缓慢扩散共同引起的。我们早期的工作证明了非导电静态混合器在减少浓度极化效应方面的潜力。然而，将导电静态混合器用作电极的研究却很少。在这项研究中，我们提出了一种通过电极混合器的添加剂制造流的新概念。我们的电极几何结构结合了高表面积和混合特性，减少了输运限制反应的浓度极化效应。在可控条件下，应用限流法在添加剂制造的电化学反应器中评价了这些导电静态混合器的传质性能。
Today's electrochemical reactor design is a less developed discipline as compared to electrocatalytic synthesis. Although catalysts show increasing conversion rates, they are often operated without measures for the reduction of concentration polarization effects. As a result, a stagnant boundary layer forms at the electrode-electrolyte interface. This stagnant boundary layer presents an additional voltage drop and reduces the energy efficiency. It is generally accepted that this phenomenon is caused by a combination of fast electrode reactions and slow diffusion of the reacting species. Our earlier work demonstrated the potential of non-conducting static mixers to reduce concentration polarization effects. However, there are few studies on conductive static mixers applied as electrodes. In this study, we present a new concept of additive manufactured flow through electrode mixers. Our electrode geometry combines a high surface area with mixing properties, diminishing concentration polarization effects of transport-limited reactions. Mass transport properties of these conductive static mixers are evaluated in an additive manufactured electrochemical reactor under controlled conditions by applying the limiting-current method.