Carbon nanowalls thin films as nanostructured electrode materials in vanadium redox flow batteries
Carbon nanowalls thin films as nanostructured electrode materials in vanadium redox flow batteries
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DOI：
10.1016/j.nanoen.2012.07.003
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发表时间：
2012-11-01
期刊：
影响因子：
17.6
通讯作者：
Santamaria, Ricardo
中科院分区：
文献类型：
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作者：
Gonzalez, Zoraida;Vizireanu, Sorin;Santamaria, Ricardo
采用射频等离子体增强化学气相沉积（RF-PECVD）技术，在不同工艺条件下制备了三种碳纳米管（CNW）薄膜，并将其作为钒氧化还原液流电池（VRFB）正极半电池的电极材料进行了研究。这些互连石墨烯的2D网络在低过电位和快速电子转移动力学方面表现出对V（IV）/V（V）氧化还原对的优异电化学性能。这可以归因于CNW的某些特定特征，例如石墨烯平面垂直于衬底的布置，从而促进电子从衬底转移并导致大量暴露的反应性石墨边缘平面。在各种扫描速率下的重复循环伏安法测量以及SEM图像证明了这些材料的长期稳定性。所获得的结果代表了在开发高效VRFB电极材料方面向前迈出的重要一步。(C)2012爱思唯尔有限公司保留所有权利。
Three carbon nanowalls (CNWs) thin films, synthesized by Radiofrequency Plasma Enhanced Chemical Vapor Deposition (RF-PECVD) using different processing parameters, are studied as electrode materials in the positive half-cell of a Vanadium Redox Flow Battery (VRFB). These 2D-networks of interconnected graphenes exhibit an excellent electrochemical performance towards the V(IV)/V(V) redox couple in terms of a low overpotential and fast electron transfer kinetics. This can be attributed to certain specific features of CNWs such as the arrangement of the graphene planes perpendicular to the substrate, thus facilitating the electron transfer from the substrate and resulting in a large amount of exposed reactive graphitic edge planes. Repetitive cyclic voltammetry measurements, at various scan rates, together with SEM images evidence the long term stability of these materials. The obtained results represent a significant step forward in the development of highly effective VRFB electrode materials. (C) 2012 Elsevier Ltd. All rights reserved.