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首页> 外文期刊>RSC Advances >In situ mass change and gas analysis of 3D manganese oxide/graphene aerogel for supercapacitors
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In situ mass change and gas analysis of 3D manganese oxide/graphene aerogel for supercapacitors

机译：超级电容器用3D氧化锰/石墨烯气凝胶的原位质量变化和气体分析

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摘要

Manganese oxide nanoparticles decorated on 3D reduced graphene oxide aerogels (3D MnO _( x ) /rGO _(ae) ) for neutral electrochemical capacitors were successfully produced by a rapid microwave reduction process within 20 s. The symmetric electrochemical capacitor of 3D MnO _( x ) /rGO _(ae) (Mn 3.0 at%) storing charges via both electric double layer capacitance (EDLC) and pseudocapacitance mechanisms exhibits a specific capacitance of 240 F g ~(?1) as compared with 190 F g ~(?1) of that using the bare 3D rGO _(ae) at 0.5 A g ~(?1) in 1 M Na _(2) SO _(4) (aq.) electrolyte. It retains 90% of the initial capacitance after 10?000 cycles, demonstrating high cycling stability. In addition, the charge storage mechanism of 3D MnO _( x ) /rGO _(ae) was investigated using an electrochemical quartz crystal microbalance. In situ gas analysis using differential electrochemical mass spectrometry (DEMS) shows the CO _(2) evolution at a cell potential over 1 V indicating that the positive electrode is possibly the voltage limiting electrode in the full cell. This finding may be useful for further development of practical high power and energy supercapacitors.
机译：通过20 s的快速微波还原工艺成功制备了3D还原氧化石墨烯气凝胶（3D MnO_（x）/ rGO_（ae））上装饰的氧化锰纳米颗粒。通过双电层电容（EDLC）和伪电容机制存储电荷的3D MnO_（x）/ rGO_（ae）（Mn 3.0 at％）对称电化学电容器表现出的比电容为240 F g〜（？1）与在1 M Na _（2）SO _（4）（水溶液）中使用0.5 A g〜（？1）的裸露3D rGO _（ae）时的190 F g〜（？1）相比。 10，000次循环后，它保留了90％的初始电容，显示出高的循环稳定性。此外，使用电化学石英晶体微量天平研究了3D MnO_（x）/ rGO_（ae）的电荷存储机理。使用差分电化学质谱法（DEMS）进行的原位气体分析显示，电池电势超过1 V时，CO _（2）逸出，表明正极可能是整个电池中的限压电极。该发现对于进一步开发实用的大功率和能量超级电容器可能是有用的。

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