Multifunctional Mesoporous Polyaniline/Graphene Nanosheets for Flexible Planar Integrated Microsystem of Zinc Ion Microbattery and Gas Sensor
Xiao Wang, Jieqiong Qin, Qi Hu, Pratteek Das, Pengchao Wen, Shuanghao Zheng, Xuechang Zhou, Liang Feng, Zhong‐Shuai Wu
Abstract
Abstract The prosperity of smart portable microdevices urgently requires an advanced integrated microsystem equipped with cost‐effective safe microbatteries and ultra‐stable sensitive sensors. However, the practical application of smart microdevices is limited by complex active materials with single function. Here, the two‐dimensional (2D) mesoporous nanosheets of polyaniline decorated on graphene with large specific surface area of 141 m 2 g −1 , ample active sites, comparable conductivity, and ordered mesopores of 18 nm for a new‐type co‐planar integrated microsystem of zinc ion microbattery and gas sensor are developed. These unique triple‐function mesoporous nanosheets are well proved for dendrite‐free zinc anode with long cyclability (>500 h) and small overpotential (48 mV), a high performance cathode of zinc ion microbattery with outstanding volumetric capacity of 78 mAh cm –3 outperforming their counterparts reported, and a highly sensitive gas sensor with a resistance response (Δ R / R 0 %) of 118% for 20 ppm NH 3 . Moreover, the co‐planar battery‐sensor integrated microsystem exhibits superior mechanical stability and smart integration. Therefore, this work will open many opportunities to develop multifunctional 2D mesoporous materials for high performance smart integrated microsystems.