Salt-templated porous carbon–carbon composite electrodes for application in vanadium redox flow batteries
Salt-templated porous carbon–carbon composite electrodes for application in vanadium redox flow batteries
复制标题
DOI：
10.1039/c7ta07759a
复制
发表时间：
2017-12
影响因子：
--
通讯作者：
Maike Schnucklake;Sophie Kuecken;A. Fetyan;Johannes Schmidt;Arne Thomas;C. Roth
中科院分区：
文献类型：
--
作者：
Maike Schnucklake;Sophie Kuecken;A. Fetyan;Johannes Schmidt;Arne Thomas;C. Roth
以氯化铁（III）溶液（0.5 wt% Fe）为催化剂浸渍聚丙烯腈基毡，优化了催化石墨化工艺。通过这种方法，毡的石墨化温度降低到1000℃以下。这使得毡中保留了较高的氮含量，很可能提高了它们在氧化还原液流电池中的电催化活性。此外，较低的工艺温度将在未来降低碳毡（CF）电极的生产成本。将催化石墨化与盐模板步骤相结合，获得了比表面积增加100倍（126 m2 g−1）的多孔碳-碳复合电极。采用x射线衍射（XRD）、x射线光电子能谱（XPS）、扫描电镜（SEM）和氮吸附（BET）对复合电极的结构、石墨化程度和孔隙度进行了表征，并采用循环伏安法（CV）评价了复合电极在全钒氧化还原液流电池中的电化学性能。
The catalytic graphitization procedure was optimized by impregnating polyacrylonitrile-based felts with iron(III) chloride solution (0.5 wt% Fe) as the catalyst. By this approach, the graphitization temperature of the felts was reduced to 1000 °C and below. This allowed retaining higher nitrogen contents in the felts, most probably enhancing their electrocatalytic activity for utilization in redox flow batteries. Moreover, lower process temperatures will reduce the production costs of carbon felt (CF) electrodes in the future. Combining the catalytic graphitization with a salt-templating step, porous carbon–carbon composite electrodes with a 100 times increased surface area (126 m2 g−1) were obtained. The structure, graphitization degree and porosity were characterized using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and nitrogen sorption (BET), whereas the electrochemical performance of the composite electrodes for application in all-vanadium redox flow batteries was evaluated by cyclic voltammetry (CV).