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

Autor: Kim E; Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea.; National Nano Fab Center (NNFC), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Kim S; Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Jin HM; Department of Organic Materials Engineering, Chungnam National University, 99 Daehak-Ro, Yuseong-Gu, Daejeon, 34134, Republic of Korea.; Department of Materials Science and Engineering, Chungnam National University, 99 Daehak-Ro, Yuseong-Gu, Daejeon, 34134, Republic of Korea., Kim G; National Nano Fab Center (NNFC), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Ha HH; National Nano Fab Center (NNFC), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Choi Y; National Nano Fab Center (NNFC), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Min K; National Nano Fab Center (NNFC), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Cho SH; National Nano Fab Center (NNFC), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Han H; National Nano Fab Center (NNFC), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Ahn CW; National Nano Fab Center (NNFC), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Roh J; Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Oh IK; Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea., Lee J; Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea. jwlee1@kaist.ac.kr., Lee Y; National Nano Fab Center (NNFC), 291 Daehak-Ro, Yuseong-Gu, Daejeon, 34141, Republic of Korea. yhlee@knu.ac.kr.; Department of Nano & Advanced Materials Science and Engineering, Kyungpook National University, 2559, Gyeongsang-Daero, Sangju-Si, Gyeongsangbuk-Do, 37224, Republic of Korea. yhlee@knu.ac.kr.
Jazyk: angličtina
Zdroj: Nano-micro letters [Nanomicro Lett] 2024 Dec 09; Vol. 17 (1), pp. 86. Date of Electronic Publication: 2024 Dec 09.
DOI: 10.1007/s40820-024-01567-2
Abstrakt: 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.
Competing Interests: Declarations. Conflict of interest: The authors declare no interest conflict. They have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(© 2024. The Author(s).)
Databáze: MEDLINE
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