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Porous N- and S-doped carbon–carbon composite electrodes by soft-templating for redox flow batteries

机译:通过软模板法将多孔的N和S掺杂的碳-碳复合电极用于氧化还原液流电池

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摘要

Highly porous carbon–carbon composite electrodes for the implementation in redox flow battery systems have been synthesized by a novel soft-templating approach. A PAN-based carbon felt was embedded into a solution containing a phenolic resin, a nitrogen source (pyrrole-2-carboxaldehyde) and a sulfur source (2-thiophenecarboxaldehyde), as well as a triblock copolymer (Pluronic® F-127) acting as the structure-directing agent. By this strategy, highly porous carbon phase co-doped with nitrogen and sulfur was obtained inside the macroporous carbon felt. For the investigation of electrode structure and porosity X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and nitrogen sorption (BET) were used. The electrochemical performance of the carbon felts was evaluated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The N- and S-doped carbon electrodes show promising activity for the positive side reaction and could be seen as a significant advance in the design of carbon felt electrodes for use in redox flow batteries.
机译:用于氧化还原液流电池系统的高度多孔的碳-碳复合电极已经通过一种新颖的软模板方法合成。将PAN基碳毡嵌入到包含酚醛树脂,氮源(吡咯-2-甲醛)和硫源(2-噻吩甲醛)以及三嵌段共聚物(Pluronic ® F-127)作为结构导向剂。通过这种策略,在大孔碳毡内部获得了共掺杂有氮和硫的高孔隙度碳相。为了研究电极结构和孔隙率,使用了X射线光电子能谱(XPS),扫描电子显微镜(SEM)和氮吸附(BET)。碳毡的电化学性能通过循环伏安法(CV)和电化学阻抗谱(EIS)进行评估。 N和S掺杂的碳电极对正极副反应显示出有希望的活性,可以看作是设计用于氧化还原液流电池的碳毡电极的重大进步。

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