Bailmare Deepa B, Tripathi Prashant, Deshmukh Abhay D, Gupta Bipin Kumar
Energy Materials and Devices Laboratory, Department of Physics, RTM Nagpur University, Nagpur, 440033, India.
Photonic Materials Metrology Subdivision, Advanced Materials and Device Metrology Division, CSIR-National Physical Laboratory, Dr. K.S. Krishnan Road, New Delhi, 110012, India.
Sci Rep. 2022 Feb 23;12(1):3084. doi: 10.1038/s41598-022-06839-8.
Redox active electrolyte supercapacitors differ significantly from the conventional electrolytes based storage devices but face a long term stability issue which requires a different approach while designing the systems. Here, we show the change in layered double hydroxides (LDHs) systems with rare earth elements (lanthanum) can drastically influence the stability of two dimensional LDH systems in redox electrolyte. We find that the choice of rare earth element (lanthanum) having magnetic properties and higher thermal and chemical stability has a profound effect on the stability of La-Co LDHs electrode in redox electrolyte. The fabricated hybrid device with rare earth based positive electrode and carbon as negative electrode having redox electrolyte leads to long stable high volumetric/gravimetric capacity at high discharge rate, demonstrates the importance of considering the rare earth elements while designing the LDH systems for redox active supercapacitor development.
氧化还原活性电解质超级电容器与传统的基于电解质的存储设备有显著不同，但面临长期稳定性问题，这在设计系统时需要采用不同的方法。在此，我们表明含稀土元素（镧）的层状双氢氧化物（LDH）体系的变化会极大地影响二维LDH体系在氧化还原电解质中的稳定性。我们发现，具有磁性以及更高热稳定性和化学稳定性的稀土元素（镧）的选择对La-Co LDHs电极在氧化还原电解质中的稳定性有深远影响。所制备的以稀土基正极和碳为负极且含有氧化还原电解质的混合器件在高放电速率下具有长期稳定的高体积/重量容量，这证明了在设计用于氧化还原活性超级电容器开发的LDH体系时考虑稀土元素的重要性。
