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Guo X, Sun Z, Zhu Y, Lee C. Zero-Biased Bionic Fingertip E-Skin with Multimodal Tactile Perception and Artificial Intelligence for Augmented Touch Awareness. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2406778. [PMID: 39129356 DOI: 10.1002/adma.202406778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2024] [Revised: 07/17/2024] [Indexed: 08/13/2024]
Abstract
Electronic skins (E-Skins) are crucial for future robotics and wearable devices to interact with and perceive the real world. Prior research faces challenges in achieving comprehensive tactile perception and versatile functionality while keeping system simplicity for lack of multimodal sensing capability in a single sensor. Two kinds of tactile sensors, transient voltage artificial neuron (TVAN) and sustained potential artificial neuron (SPAN), featuring self-generated zero-biased signals are developed to realize synergistic sensing of multimodal information (vibration, material, texture, pressure, and temperature) in a single device instead of complex sensor arrays. Simultaneously, machine learning with feature fusion is applied to fully decode their output information and compensate for the inevitable instability of applied force, speed, etc, in real applications. Integrating TVAN and SPAN, the formed E-Skin achieves holistic touch awareness in only a single unit. It can thoroughly perceive an object through a simple touch without strictly controlled testing conditions, realize the capability to discern surface roughness from 0.8 to 1600 µm, hardness from 6HA to 85HD, and correctly distinguish 16 objects with temperature variance from 0 to 80 °C. The E-skin also features a simple and scalable fabrication process, which can be integrated into various devices for broad applications.
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Affiliation(s)
- Xinge Guo
- Department of Electrical & Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117576, Singapore
- Center for Intelligent Sensors and MEMS (CISM), National University of Singapore, 5 Engineering Drive 1, Singapore, 117608, Singapore
- Institute of Microelectronics (IME), Agency for Science, Technology, and Research (A*STAR), Singapore, 138634, Singapore
| | - Zhongda Sun
- Department of Electrical & Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117576, Singapore
- Center for Intelligent Sensors and MEMS (CISM), National University of Singapore, 5 Engineering Drive 1, Singapore, 117608, Singapore
- National University of Singapore Suzhou Research Institute (NUSRI), Suzhou, 215123, China
| | - Yao Zhu
- Institute of Microelectronics (IME), Agency for Science, Technology, and Research (A*STAR), Singapore, 138634, Singapore
| | - Chengkuo Lee
- Department of Electrical & Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117576, Singapore
- Center for Intelligent Sensors and MEMS (CISM), National University of Singapore, 5 Engineering Drive 1, Singapore, 117608, Singapore
- National University of Singapore Suzhou Research Institute (NUSRI), Suzhou, 215123, China
- NUS Graduate School - Integrative Sciences and Engineering Program (ISEP), National University of Singapore, Singapore, 119077, Singapore
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Liu L, Dou Y, Wang J, Zhao Y, Kong W, Ma C, He D, Wang H, Zhang H, Chang A, Zhao P. Recent Advances in Flexible Temperature Sensors: Materials, Mechanism, Fabrication, and Applications. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2405003. [PMID: 39073012 PMCID: PMC11423192 DOI: 10.1002/advs.202405003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2024] [Revised: 07/07/2024] [Indexed: 07/30/2024]
Abstract
Flexible electronics is an emerging and cutting-edge technology which is considered as the building blocks of the next generation micro-nano electronics. Flexible electronics integrate both active and passive functions in devices, driving rapid developments in healthcare, the Internet of Things (IoT), and industrial fields. Among them, flexible temperature sensors, which can be directly attached to human skin or curved surfaces of objects for continuous and stable temperature measurement, have attracted much attention for applications in disease prediction, health monitoring, robotic signal sensing, and curved surface temperature measurement. Preparing flexible temperature sensors with high sensitivity, fast response, wide temperature measurement interval, high flexibility, stretchability, low cost, high reliability, and stability has become a research target. This article reviewed the latest development of flexible temperature sensors and mainly discusses the sensitive materials, working mechanism, preparation process, and the applications of flexible temperature sensors. Finally, conclusions based on the latest developments, and the challenges and prospects for research in this field are presented.
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Affiliation(s)
- Lin Liu
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
- University of Chinese Academy of SciencesBeijing100049China
| | - Yingying Dou
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
| | - Junhua Wang
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
| | - Yan Zhao
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
| | - Wenwen Kong
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
| | - Chaoyan Ma
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
| | - Donglin He
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
| | - Hongguang Wang
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
| | - Huimin Zhang
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
| | - Aimin Chang
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
| | - Pengjun Zhao
- State Key Laboratory of Functional Materials and Devices for Special Environmental ConditionsXinjiang Key Laboratory of Electronic Information Materials and DevicesXinjiang Technical Institute of Physics & ChemistryCAS40–1 South Beijing RoadUrumqi830011China
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Wang Z, Li N, Yang X, Zhang Z, Zhang H, Cui X. Thermogalvanic hydrogel-based e-skin for self-powered on-body dual-modal temperature and strain sensing. MICROSYSTEMS & NANOENGINEERING 2024; 10:55. [PMID: 38680522 PMCID: PMC11055913 DOI: 10.1038/s41378-024-00693-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 03/07/2024] [Accepted: 03/11/2024] [Indexed: 05/01/2024]
Abstract
Sensing of both temperature and strain is crucial for various diagnostic and therapeutic purposes. Here, we present a novel hydrogel-based electronic skin (e-skin) capable of dual-mode sensing of temperature and strain. The thermocouple ion selected for this study is the iodine/triiodide (I-/I3-) redox couple, which is a common component in everyday disinfectants. By leveraging the thermoelectric conversion in conjunction with the inherent piezoresistive effect of a gel electrolyte, self-powered sensing is achieved by utilizing the temperature difference between the human body and the external environment. The composite hydrogels synthesized from polyvinyl alcohol (PVA) monomers using a simple freeze‒thaw method exhibit remarkable flexibility, extensibility, and adaptability to human tissue. The incorporation of zwitterions further augments the resistance of the hydrogel to dehydration and low temperatures, allowing maintenance of more than 90% of its weight after 48 h in the air. Given its robust thermal current response, the hydrogel was encapsulated and then integrated onto various areas of the human body, including the cheeks, fingers, and elbows. Furthermore, the detection of the head-down state and the monitoring of foot movements demonstrate the promising application of the hydrogel in supervising the neck posture of sedentary office workers and the activity status. The successful demonstration of self-powered on-body temperature and strain sensing opens up new possibilities for wearable intelligent electronics and robotics.
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Affiliation(s)
- Zhaosu Wang
- College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan, 030024 China
| | - Ning Li
- College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan, 030024 China
| | - Xinru Yang
- College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan, 030024 China
| | - Zhiyi Zhang
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024 China
| | - Hulin Zhang
- College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan, 030024 China
| | - Xiaojing Cui
- School of Physics and Information Engineering, Shanxi Normal University, Taiyuan, 030031 China
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Yu X, Ji Y, Shen X, Le X. Self-Powered Pressure-Temperature Bimodal Sensing Based on the Piezo-Pyroelectric Effect for Robotic Perception. SENSORS (BASEL, SWITZERLAND) 2024; 24:2773. [PMID: 38732880 PMCID: PMC11086114 DOI: 10.3390/s24092773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Revised: 04/21/2024] [Accepted: 04/23/2024] [Indexed: 05/13/2024]
Abstract
Multifunctional sensors have played a crucial role in constructing high-integration electronic networks. Most of the current multifunctional sensors rely on multiple materials to simultaneously detect different physical stimuli. Here, we demonstrate the large piezo-pyroelectric effect in ferroelectric Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) single crystals for simultaneous pressure and temperature sensing. The outstanding piezoelectric and pyroelectric properties of PMN-PT result in rapid response speed and high sensitivity, with values of 46 ms and 28.4 nA kPa-1 for pressure sensing, and 1.98 s and 94.66 nC °C-1 for temperature detection, respectively. By leveraging the distinct differences in the response speed of piezoelectric and pyroelectric responses, the piezo-pyroelectric effect of PMN-PT can effectively detect pressure and temperature from mixed-force thermal stimuli, which enables a robotic hand for stimuli classification. With appealing multifunctionality, fast speed, high sensitivity, and compact structure, the proposed self-powered bimodal sensor therefore holds significant potential for high-performance artificial perception.
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Affiliation(s)
- Xiang Yu
- School of Physics, Beihang University, Beijing 100191, China
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Medicine and Engineering, Beihang University, Beijing 100191, China
- Beijing Key Laboratory of Advanced Nuclear Energy Materials and Physics, Beihang University, Beijing 100191, China
| | - Yun Ji
- Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117583, Singapore
| | - Xinyi Shen
- School of Physics, Beihang University, Beijing 100191, China
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Medicine and Engineering, Beihang University, Beijing 100191, China
- Beijing Key Laboratory of Advanced Nuclear Energy Materials and Physics, Beihang University, Beijing 100191, China
| | - Xiaoyun Le
- School of Physics, Beihang University, Beijing 100191, China
- Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, School of Medicine and Engineering, Beihang University, Beijing 100191, China
- Beijing Key Laboratory of Advanced Nuclear Energy Materials and Physics, Beihang University, Beijing 100191, China
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Gao N, Huang J, Chen Z, Liang Y, Zhang L, Peng Z, Pan C. Biomimetic Ion Channel Regulation for Temperature-Pressure Decoupled Tactile Perception. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2302440. [PMID: 37668280 DOI: 10.1002/smll.202302440] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Revised: 08/15/2023] [Indexed: 09/06/2023]
Abstract
The perception of temperature and pressure of skin plays a vital role in joint movement, hand grasp, emotional expression, and self-protection of human. Among many biomimetic materials, ionic gels are uniquely suited to simulate the function of skin due to its ionic transport mechanism. However, both the temperature and pressure sensing are heavily dependent on the changes in ionic conductivity, making it impossible to decouple the temperature and pressure signals. Here, a pressure-insensitive and temperature-modulated ion channel is designed by synergistic strategies for gel skeleton's compact packing and ultra-thin structure, mimicking the function of the temperature ion channel in human skin. This ion-confined gel can completely suppress the pressure response of the temperature sensing layer. Furthermore, a temperature-pressure decoupled ionic sensor is fabricated and it is demonstrated that the ionic sensor can sense complex signals of temperature and pressure. This novel and effective approach has great potential to overcome one of the current barriers in developing ionic skin and extending its applications.
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Affiliation(s)
- Naiwei Gao
- Center for Stretchable Electronics and Nano Sensors, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, School of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Jiaoya Huang
- Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Zhiwu Chen
- Department of Chemistry, Renmin University of China, Beijing, 100872, P. R. China
| | - Yegang Liang
- Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
| | - Li Zhang
- Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
| | - Zhengchun Peng
- Center for Stretchable Electronics and Nano Sensors, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education, School of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Caofeng Pan
- Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 101400, P. R. China
- School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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Liu Y, Zhao Z, Guo C, Huang Z, Zhang W, Ma F, Wang Z, Kong Q, Wang Y. Application and development of hydrogel biomaterials for the treatment of intervertebral disc degeneration: a literature review. Front Cell Dev Biol 2023; 11:1286223. [PMID: 38130952 PMCID: PMC10733535 DOI: 10.3389/fcell.2023.1286223] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 11/24/2023] [Indexed: 12/23/2023] Open
Abstract
Low back pain caused by disc herniation and spinal stenosis imposes an enormous medical burden on society due to its high prevalence and refractory nature. This is mainly due to the long-term inflammation and degradation of the extracellular matrix in the process of intervertebral disc degeneration (IVDD), which manifests as loss of water in the nucleus pulposus (NP) and the formation of fibrous disc fissures. Biomaterial repair strategies involving hydrogels play an important role in the treatment of intervertebral disc degeneration. Excellent biocompatibility, tunable mechanical properties, easy modification, injectability, and the ability to encapsulate drugs, cells, genes, etc. make hydrogels good candidates as scaffolds and cell/drug carriers for treating NP degeneration and other aspects of IVDD. This review first briefly describes the anatomy, pathology, and current treatments of IVDD, and then introduces different types of hydrogels and addresses "smart hydrogels". Finally, we discuss the feasibility and prospects of using hydrogels to treat IVDD.
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Affiliation(s)
| | | | | | | | | | | | | | - Qingquan Kong
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Yu Wang
- Department of Orthopedic Surgery and Orthopedic Research Institute, West China Hospital, Sichuan University, Chengdu, Sichuan, China
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Yang K, Bai C, Liu B, Liu Z, Cui X. Self-Powered, Non-Toxic, Recyclable Thermogalvanic Hydrogel Sensor for Temperature Monitoring of Edibles. MICROMACHINES 2023; 14:1327. [PMID: 37512638 PMCID: PMC10385118 DOI: 10.3390/mi14071327] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 06/20/2023] [Accepted: 06/26/2023] [Indexed: 07/30/2023]
Abstract
Thermogalvanic hydrogel, an environmentally friendly power source, enable the conversion of low-grade thermal energy to electrical energy and powers microelectronic devices in a variety of scenarios without the need for additional batteries. Its toxicity, mechanical fragility and low output performance are a hindrance to its wide application. Here, we demonstrate thermoelectric gels with safe non-toxic, recyclable, highly transparent and flexible stretchable properties by introducing gelatin as a polymer network and SO3/42- as a redox electric pair. When the temperature difference is 10 K, the gel-based thermogalvanic cell achieves an open-circuit voltage of about 16.2 mV with a maximum short-circuit current of 39 μA. Furthermore, we extended the application of the Gel-SO3/42- gel to monitor the temperature of hot or cold food, enabling self-powered sensing for food temperature detection. This research provides a novel concept for harvesting low-grade thermal energy and achieving safe and harmless self-driven temperature monitoring.
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Affiliation(s)
- Kun Yang
- College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Chenhui Bai
- College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Boyuan Liu
- College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Zhoutong Liu
- College of Electronic Information and Optical Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Xiaojing Cui
- Shanxi Transportation Technology Research & Development Co., Ltd., Taiyuan 030032, China
- School of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China
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Zhao Z, Hu YP, Liu KY, Yu W, Li GX, Meng CZ, Guo SJ. Recent Development of Self-Powered Tactile Sensors Based on Ionic Hydrogels. Gels 2023; 9:gels9030257. [PMID: 36975706 PMCID: PMC10048595 DOI: 10.3390/gels9030257] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 03/15/2023] [Accepted: 03/20/2023] [Indexed: 03/29/2023] Open
Abstract
Hydrogels are three-dimensional polymer networks with excellent flexibility. In recent years, ionic hydrogels have attracted extensive attention in the development of tactile sensors owing to their unique properties, such as ionic conductivity and mechanical properties. These features enable ionic hydrogel-based tactile sensors with exceptional performance in detecting human body movement and identifying external stimuli. Currently, there is a pressing demand for the development of self-powered tactile sensors that integrate ionic conductors and portable power sources into a single device for practical applications. In this paper, we introduce the basic properties of ionic hydrogels and highlight their application in self-powered sensors working in triboelectric, piezoionic, ionic diode, battery, and thermoelectric modes. We also summarize the current difficulty and prospect the future development of ionic hydrogel self-powered sensors.
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Affiliation(s)
- Zhen Zhao
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
- Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Yong-Peng Hu
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
- Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Kai-Yang Liu
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
- Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Wei Yu
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
- Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Guo-Xian Li
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
- Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Chui-Zhou Meng
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
- Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Shi-Jie Guo
- State Key Laboratory for Reliability and Intelligence of Electrical Equipment, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
- Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, School of Mechanical Engineering, Hebei University of Technology, Tianjin 300401, China
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Zhang J, Bai C, Wang Z, Liu X, Li X, Cui X. Low-Grade Thermal Energy Harvesting and Self-Powered Sensing Based on Thermogalvanic Hydrogels. MICROMACHINES 2023; 14:mi14010155. [PMID: 36677217 PMCID: PMC9863090 DOI: 10.3390/mi14010155] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 06/07/2023]
Abstract
Thermoelectric cells (TEC) directly convert heat into electricity via the Seebeck effect. Known as one TEC, thermogalvanic hydrogels are promising for harvesting low-grade thermal energy for sustainable energy production. In recent years, research on thermogalvanic hydrogels has increased dramatically due to their capacity to continuously convert heat into electricity with or without consuming the material. Until recently, the commercial viability of thermogalvanic hydrogels was limited by their low power output and the difficulty of packaging. In this review, we summarize the advances in electrode materials, redox pairs, polymer network integration approaches, and applications of thermogalvanic hydrogels. Then, we highlight the key challenges, that is, low-cost preparation, high thermoelectric power, long-time stable operation of thermogalvanic hydrogels, and broader applications in heat harvesting and thermoelectric sensing.
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Affiliation(s)
- Jiedong Zhang
- Qiushi College, Taiyuan University of Technology, Taiyuan 030024, China
| | - Chenhui Bai
- College of Information and Computer, Taiyuan University of Technology, Taiyuan 030024, China
| | - Zhaosu Wang
- College of Information and Computer, Taiyuan University of Technology, Taiyuan 030024, China
| | - Xiao Liu
- Shanxi Transport Information Communication Company Limited, Taiyuan 030006, China
| | - Xiangyu Li
- College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
| | - Xiaojing Cui
- Shanxi Transport Information Communication Company Limited, Taiyuan 030006, China
- College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China
- College of Physics and Information Engineering, Shanxi Normal University, Taiyuan 030031, China
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