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Effects of electrode thickness and crystal water on pseudocapacitive performance of layered birnessite MnO2

机译：电极厚度和晶体水对分层Birnerneryite MnO2的假胶质性能的影响

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摘要

Manganese dioxide (MnO2) nanomaterials with two-dimensional (2D) layered birnessite structures are promising pseudocapacitive electrode materials. However, the effects of structural factors on their electrochemical performance is not fully understood. We synthesize alkali-free crystal water containing 2D layered birnessite MnO2 electrodes with controllable mass loading from 0.1 to 19.3 mg cm(-2) to investigate the effects of electrode thickness and crystal water functions on crystal structure and pseudocapacitive behavior, to promote its industrialization. We find that the crystal water enlarges the interlayer space of birnessite MnO2 with electrolyte ions transported much more easily, resulting in higher specific capacitance of 702 F g(-1) (70.2 mF cm(-2)) and excellent cycling stability of 20 000 charge-discharge cycles even at a mass loading of up to 10.8 mg cm(-2). Such gains in specific capacitance are weakened significantly with raised mass loading. Thus, compared to a carbon cloth substrate, a carbon nanotube film with enhanced electron space transport capability presents better performance, indicating an effective strategy for higher mass loading cases. The present work sheds light on an efficient method for achieving high capacitance and mass loading together, for practical applications.
机译：二氧化碳（MNO2）纳米材料具有二维（2D）层状体积结构，是伪偶联电极材料。然而，结构因素对其电化学性能的影响尚未完全理解。我们合成含有2D层状体积MnO2电极的无碱晶体水，可控制质量加载0.1至19.3mg cm（-2），研究电极厚度和晶体功能对晶体结构和假胶种行为的影响，以促进其工业化。我们发现晶体水通过电解质离子更容易地传输的电解质水溶性MnO2的层间空间，导致更高的特定电容为702 f g（-1）（70.2mF cm（-2））和20 000的优异循环稳定性即使在高达10.8mg cm（-2）的质量负荷下也要充电 - 放电循环。在凸起的质量加载中，特定电容中的这种增益显着削弱。因此，与碳布料基板相比，具有增强的电子空间传输能力的碳纳米管膜具有更好的性能，表明具有更高质量载物的有效策略。目前的工作揭示了一种有效的方法，用于实现高电容和批量装载，用于实际应用。

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