Liu Hao, Liu Xiao-Juan, Dong Feng-Ying, Sun Xin-Zhi
College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University Qingdao 266109 China
RSC Adv. 2020 Sep 25;10(58):35490-35498. doi: 10.1039/d0ra06376b. eCollection 2020 Sep 21.
It is a great challenge to ideally integrate graphene with its unique two-dimensional (2D) and porous structure into the pseudocapacitive materials. In this paper, a simple technique, direct-laser-writing (DLW), was developed to fabricate microsupercapacitors (MSCs) with excellent electrochemical performance, marked as Ni-Co-S/laser induced graphene (LIG) that exhibit a high areal specific capacitance of 680 mF cm at the current density of 1 mA cm. A symmetric MSC device was assembled using Ni-Co-S/LIG as a positive electrode and active carbon (AC) as the negative electrode, and exhibited a high areal energy density of 56.9 μW h cm at the power density of 800 μW cm, and excellent cycling stability maintaining 89.6% of the areal specific capacitance after 8000 cycles. The synergistic effect of bimetallic Ni-Co-S and the LIG with the 2D structure results in the excellent electrochemical performance. This work demonstrates a method to integrate Ni-Co-S pseudocapacitive materials into porous graphene with a direct-laser-writing technique. The produced integrated materials possess high energy density that can be used in MSCs.
将具有独特二维（2D）和多孔结构的石墨烯理想地集成到赝电容材料中是一项巨大的挑战。在本文中，开发了一种简单的技术——直接激光写入（DLW），用于制造具有优异电化学性能的微型超级电容器（MSC），标记为Ni-Co-S/激光诱导石墨烯（LIG），在1 mA cm的电流密度下表现出680 mF cm的高面积比电容。使用Ni-Co-S/LIG作为正极和活性炭（AC）作为负极组装了一个对称的MSC器件，在800 μW cm的功率密度下表现出56.9 μW h cm的高面积能量密度，并且具有出色的循环稳定性，在8000次循环后保持面积比电容的89.6%。双金属Ni-Co-S和具有二维结构的LIG的协同效应导致了优异的电化学性能。这项工作展示了一种通过直接激光写入技术将Ni-Co-S赝电容材料集成到多孔石墨烯中的方法。所制备的集成材料具有高能量密度，可用于MSC。
