Efficient 3D Printed Pseudocapacitive Electrodes with Ultrahigh MnO2 Loading
Efficient 3D Printed Pseudocapacitive Electrodes with Ultrahigh MnO2 Loading
复制标题
DOI：
10.1016/j.joule.2018.09.020
复制
发表时间：
2019-02-20
期刊：
影响因子：
39.8
通讯作者：
Li, Yat
中科院分区：
文献类型：
--
作者：
Yao, Bin;Chandrasekaran, Swetha;Li, Yat
在高质量负载下保持电极的良好电化学性能对于能量存储具有重要意义。沉积在集流体上的诸如氧化锰（MnO 2）的赝电容材料已经实现了出色的重量电容，有时甚至接近其理论值。然而，这仅可通过通常小于lmg cm（-2）的非常小的活性材料质量负载来实现。增加的质量负载通常导致电容性能的急剧衰减，这是由于块体材料中的缓慢离子扩散。在这里，我们展示了一种3D打印的石墨烯气凝胶电极，其MnO 2负载量为182.2 mg cm（-2），达到了创纪录的44.13 F cm（-2）的面积电容。最重要的是，这种3D打印的石墨烯气凝胶/MnO 2电极可以同时实现归一化为面积、重量和体积的优异电容，这是大多数电极的折衷。这项工作成功地验证了印刷实用的赝电容电极的可行性，这可能会彻底改变赝电容器的制造。
Retaining sound electrochemical performance of electrodes at high mass loading holds significant importance to energy storage. Pseudocapacitive materials such as manganese oxide (MnO2) deposited on current collectors have achieved outstanding gravimetric capacitances, sometimes even close to their theoretical values. Yet, this is only achievable with very small mass loading of active material typically less than 1 mg cm(-2). Increasing mass loading often leads to drastic decay of capacitive performance due to sluggish ion diffusion in bulk material. Here, we demonstrate a 3D printed graphene aerogel electrode with MnO2 loading of 182.2 mg cm(-2), which achieves a record-high areal capacitance of 44.13 F cm(-2). Most importantly, this 3D printed graphene aerogel/MnO2 electrode can simultaneously achieve excellent capacitance normalized to area, gravimetry, and volume, which is the trade-off for most electrodes. This work successfully validates the feasibility of printing practical pseudocapacitive electrodes, which might revolutionize pseudocapacitor fabrication.