Unlocking Novel Functionality:Pseudocapacitive Sensing in MXene-Based Flexible Supercapacitors  

作　　者：Eunji Kim Seongbeen Kim Hyeong Min Jin Gyungtae Kim Hwi-Heon Ha Yunhui Choi Kyoungha Min Su-Ho Cho Hee Han Chi Won Ahn Jaewoo Roh Il-Kwon Oh Jinwoo Lee Yonghee Lee 

机构地区：[1]Department of Chemical and Biomolecular Engineering,Korea Advanced Institute of Science and Technology(KAIST),291 Daehak-Ro,Yuseong-Gu,Daejeon 34141,Republic of Korea [2]National Nano Fab Center(NNFC),291 Daehak-Ro,Yuseong-Gu,Daejeon 34141,Republic of Korea [3]Department of Organic Materials Engineering,Chungnam National University,99 Daehak-Ro,Yuseong-Gu,Daejeon 34134,Republic of Korea [4]Department of Materials Science and Engineering,Chungnam National University,99 Daehak-Ro,Yuseong-Gu,Daejeon 34134,Republic of Korea [5]Department of Nano&Advanced Materials Science and Engineering,Kyungpook National University,2559,Gyeongsang-Daero,Sangju-Si,Gyeongsangbuk-Do 37224,Republic of Korea [6]Department of Mechanical Engineering,Korea Advanced Institute of Science and Technology(KAIST),291 Daehak-Ro,Yuseong-Gu,Daejeon 34141,Republic of Korea

出　　处：《Nano-Micro Letters》2025年第4期212-229,共18页纳微快报(英文版)

基　　金：supported by NRF-2021M3H4A1A03047333 and NRF-2022R1F1A1075084 of the National Research Foundation(NRF)of Korea funded by the Ministry of Science and ICT,Korea;supported by Semiconductor-Secondary Battery Interfacing Platform Technology Development Project of NNFC.

摘　　要：Extensively explored for their distinctive pseudocapacitance characteristics,MXenes,a distinguished group of 2D materials,have led to remarkable achievements,particularly in the realm of energy storage devices.This work presents an innovative Pseudocapacitive Sensor.The key lies in switching the energy storage kinetics from pseudocapacitor to electrical double layer capacitor by employing the change of local pH(-log[H^(+)])in MXene-based flexible supercapacitors during bending.Pseudocapacitive sensing is observed in acidic electrolyte but absent in neutral electrolyte.Applied shearing during bending causes liquid-crystalline MXene sheets to increase in their degree of anisotropic alignment.With blocking of H+mobility due to the higher diffusion barrier,local pH increases.The electrochemical energy storage kinetics transits from Faradaic chemical protonation(intercalation)to non-Faradaic physical adsorption.We utilize the phenomenon of capacitance change due to shifting energy storage kinetics for strain sensing purposes.The developed highly sensitive Pseudocapacitive Sensors feature a remarkable gauge factor(GF)of approximately 1200,far surpassing conventional strain sensors(GF:~1 for dielectric-cap sensor).The introduction of the Pseudocapacitive Sensor represents a paradigm shift,expanding the application of pseudocapacitance from being solely confined to energy devices to the realm of multifunctional electronics.This technological leap enriches our understanding of the pseudocapacitance mechanism of MXenes,and will drive innovation in cutting-edge technology areas,including advanced robotics,implantable biomedical devices,and health monitoring systems.

关 键 词：MXenes SUPERCAPACITORS Pseudocapacitive sensing Local pH Operando measurements 

分 类 号：TM53[电气工程—电器] TP212[自动化与计算机技术—检测技术与自动化装置]