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Cu Single-Atom Decorated Three-Dimensional Nitrogen-Carbon Framework as an Oxygen Reduction Reaction Catalyst for High-Performance Zinc-Air Batteries

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ACS APPLIED NANO MATERIALS 2023年第1期7卷 1108-1119页

作者： Ma, Zhaolei Bai, Ruoning Yu, Wei Li, Guoxian Meng, Chuizhou Hebei Univ Technol Hebei Key Lab Smart Sensing & Human Robot Interact State Key Lab Reliabil & Intelligence Elect Equipm Sch Mech EngnEngn Res CtrMinist Educ Intelligent Tianjin 300401 Peoples R China

Transition metal single atoms have been considered as promising candidates for oxygen reduction reaction catalysts for developing high-performance zinc-air batteries. How to uniformly disperse metal single atoms onto an ideal porous carbon framework for full utilization of the catalyst with enriched active sites and fast mass diffusion still remains a challenge. Herein, by taking advantage of both the efficient single-atom Cu catalyst and the effective NaCl-template sacrificing method, we report the design and fabrication of a single-atom Cu catalyst decorated on a three-dimensional (3D) nitrogen-carbon (NC) framework. The developed catalyst exhibits excellent (oxygen reduction reaction) ORR catalytic activity with a high half-wave potential of 0.86 V, maximum current density of 5.53 mA cm(-2), and Tafel slope of 81.52 mV dec(-1), which are better than those of the commercial Pt/C catalyst. The comparison experiment with the 3D NC framework (no copper salt added) and the bulk Cu decorated NC framework (no NaCl added) verifies the synergistic effect between the Cu single atoms as the efficient ORR catalyst and the NaCl template to achieve the ideal porous structure. Aqueous zinc-air batteries assembled with the developed catalyst deliver good battery performance with a high open circuit voltage of 1.48 V, large specific discharge capacity of 760.47 mAh g(-1), high peak power density of 120 mW cm(-2), and stable charge-discharge cyclability for 600 h. Gel polymer electrolyte-based zinc-air batteries are also demonstrated to be workable under bending conditions for practical wearable electronic applications.

关键词： zinc-air battery oxygen reduction reaction (ORR) single-atom catalyst three-dimensional (3D) carbon framework

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Nanostructured Co3O4 Asymmetrically Deposited on a Single Carbon Cloth for an All-Solid-State Integrated Hybrid Device with Reversible Zinc-Air High-Energy Conversion and Asymmetric Supercapacitive High-Power Delivery

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ENERGY & FUELS 2021年第15期35卷 12706-12717页

作者： Hou, Zhanrui Zhu, Bo Li, Guoxian Wang, Peng Meng, Chuizhou Guo, Shijie Liu, Changhong Fan, Shoushan Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equip Hebei Key Lab Smart Sensing & Human Robot Interac Sch Mech Engn Tianjin 300401 Peoples R China Tsinghua Univ Tsinghua Foxconn Nanotechnol Res Ctr Beijing 100084 Peoples R China Tsinghua Univ Dept Phys Beijing 100084 Peoples R China

Hybrid energy devices combining multiple energy components based on different mechanisms can provide a more comprehensive output performance than individual ones. However, past attempts of connecting separate parts through additional wire connections have limitations of low energy efficiency and bulky system formation. Herein, we develop a hybrid energy device that integrates a rechargeable zinc-air battery and an asymmetric supercapacitor on a single carbon-cloth-based platform. Nanostructured Co3O4 is asymmetrically deposited in different regions of the carbon cloth to obtain bi-functions as pseudocapacitive positive electrode and catalytic air electrode. A moisturizing gel polymer electrolyte is also used to make the device integrative, compact, and flexible. A working mechanism and an operation strategy of repeated in situ charging of the supercapacitor part by the zinc-air battery part and external recharging of the zinc-air battery part are proposed and evaluated with demonstration of powering a vibration motor. The developed hybrid energy device can be self-charged to 1.15 V in 200 s followed by delivering a peak power density of 7.91 mW cm(-2) for 50 repeated cycles and be fully recharged by an external power source again. Thus, both zinc-air high-energy conversion and asymmetric supercapacitive high-power delivery are simultaneously achieved on such a single device, which has a potential use in portable and wearable electronic applications.

关键词： Capacitors Electrical energy Energy Batteries Electrodes

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Rechargeable Self-Powered pressure sensor based on Zn-ion battery with high sensitivity and Broad-Range response

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CHEMICAL ENGINEERING JOURNAL 2024年 497卷

作者： Hu, Yong-Peng Liu, Kai-Yang Bai, Ruo-Ning Liu, Da-Zhuang Yu, Wei Meng, Chui-Zhou Li, Guo-Xian Guo, Shi-Jie Hebei Univ Technol Engn Res Ctr Hebei Key Lab Smart Sensing & Human Robot Interact Minist Educ Intelligent Rehabil Equipment & Detect 5340 Xiping Rd Tianjin 300401 Peoples R China

Flexible pressure sensors find broad applications in electronic skin, human-computer interaction, and health monitoring. However, developing self-powered flexible sensors capable of detecting both dynamic and static pressures with high sensitivity and a wide detection range remains a significant challenge. Here, we report the design and fabrication of a new rechargeable Zn-ion battery-type flexible self-powered pressure sensor (RZIBFPS). In the device, the anode of a flexible Zn-ion battery is designed into a sandwich configuration with a porous isolation layer in between a conductive layer decorated with polymethylmethacrylate microspheres and a flexible Zn electrode. The self-powered pressure sensing mechanism relies on the variation in output voltage resulting from the resistance change of the anode when subjected to external pressure. This RZIB-FPS exhibits an open-circuit voltage of 1.46 V, an energy density of 392 mu Wh cm(-2), a high sensitivity (up to 42.6 mV kPa(-1)), a wide pressure detection range (up to 330 kPa), and excellent cycling stability (up to 12,000 cycles). Furthermore, the proposed all-in-one device design demonstrates excellent charge-discharge performance, manifesting its high integration level and potential for sensor miniaturization. This study introduces a new strategy for developing high-performance sensors for future self-powered smart wearable electronics.

关键词： Flexible pressure sensor Zn-ion battery Self-powered sensor Rechargeability

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Intrinsically Flexible and Breathable Supercapacitive Pressure Sensor Based on MXene and Ionic Gel Decorating Textiles for Comfortable and Ultrasensitive Wearable Healthcare Monitoring

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ACS APPLIED ELECTRONIC MATERIALS 2022年第4期4卷 1958-1967页

作者： Sun, Guifen Wang, Peng Jiang, Yongxiang Sun, Hongchang Meng, Chuizhou Tianjin Univ Technol & Educ Inst Robot & Intelligent Equipment Tianjin 300222 Peoples R China Tianjin Univ Technol & Educ Sch Mech Engn Tianjin 300222 Peoples R China Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equip Tianjin 300401 Peoples R China Hebei Univ Technol Hebei Key Lab Smart Sensing & Human Robot Interac State Key Lab Reliabil & Intelligence Elect Equip Tianjin 300401 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China

The continuous real-time monitoring of human physical health is crucial in the pursuit in a high quality of modern life and has attracted a great deal of attention in research on advanced wearable pressure sensors. However, most of the previous sensors have been built on flexible solid substrate that is not air permeable, leading to skin inflammation after a long-term skin attachment. Herein, we have developed a flexible and breathable pressure sensor based on nonwoven fabrics decorated with MXene as fabric electrodes and an ionic gel as a fabric electrolyte. Due to the advantages of both the supercapacitive iontronic sensing mechanism and the hierarchical structures of the nanoscaled stacked MXene wrapping on the microscale fabric framework, the optimized pressure sensor exhibits a high sensitivity of 31.40 kPa(-1) (0-10 kPa), a wide detection range of up to 80 kPa, and a short response time of similar to 45 ms as well as excellent repeatability and cyclability. The fabric sensor can be seamlessly woven into textiles for practical wearable sensing and is capable of detecting subtle arterial pulse beats at the wrist and weak breathing rhythms at the chest without affecting the comfort of the wearer. The incorporation of the developed fabric sensors into commonly used clothing through a facile manufacturing process is promising to achieve a comfortable health diagnosis.

关键词： pressure sensor supercapacitive iontronic flexible breathable textile electronic ultrasensitive

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Microfabrication of On-Demand Tapered Glass Capillaries by Etching Combined With Polishing

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JOURNAL OF MICROELECTROMECHANICAL SYSTEMS 2022年第3期31卷 473-480页

作者： Wei, Chunyang Yu, Chengzhuang Li, Shanshan Meng, Jiyu Li, Tiejun Pan, Feng Wang, Zichao Li, Junwei Hebei Univ Technol Hebei Key Lab Robot Sensing & Human Robot Interac Sch Mech Engn Tianjin 300132 Peoples R China Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equip Tianjin 300130 Peoples R China Jiangnan Univ Jiangsu Key Lab Adv Food Mfg Equipment & Technol Wuxi 214122 Jiangsu Peoples R China Hebei Univ Technol Inst Biophys Sch Hlth Sci & Biomed Engn Tianjin 300401 Peoples R China Hebei Univ Technol Dept Elect & Informat Engn Langfang 065000 Peoples R China

Micro fabrication of tapered glass capillaries with on-demand geometry is one of the essential issues to make specific devices for electrophysiological experiments, microfluidics, pharmaceutics. Capitalizing on chemical etching and mechanical polishing, we have developed a reliable microfabrication method to make tapered glass capillaries with on-demand size. The tip ending diameter reaches from several microns to hundreds of microns within one hour fabrication time, which can meet the requirement for microfabrication of microfluidic devices. To demonstrate the performance of the hybrid microfabrication method, the effect of etching time, and etchant concentrations are proposed. Furthermore, the surface quality of fabricated device is demonstrated to show the advantages of our microfabrication method. Then two typical applications such as the soft manipulation of zebrafish embryo and the production of emulsion droplets are performed. This hybrid microfabrication method of chemical etching combined with mechanical polishing shows great advantages to obtain on-demand size of tapered glass capillaries, and these features make it highly promising for microfabrication of glass capillary devices. [2021-0229]

关键词： Glass Chemicals Etching Microfabrication Hafnium Fabrication Corrosion Micro fabrication microfluidics tapered glass capillary chemical etching mechanical polishing

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Biomimetic Design of A Chest Carrying Nursing-care robot for Transfer Task

Biomimetic Design of A Chest Carrying Nursing-care Robot for...

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IEEE International Conference on robotics and Biomimetics (ROBIO)

作者： Liu, Yuxin Chen, Guiliang Liu, Jinyue Guo, Shijie Mukai, Toshiharu Hebei Key Lab Robot Sensing & Human Robot Interac State Key Lab Reliabil & Intelligence Elect Equip Tianjin Peoples R China Hebei Univ Technol Tianjin Peoples R China RIKEN 2-1 Hirosawa Wako Saitama 3510198 Japan Meijo Univ Tempaku Ku 1-501 Shiogamaguchi Nagoya Aichi 4688502 Japan

ISBN: (纸本)9781728103778

Patient transfer, such as lifting and moving a bedridden patient from a bed to a wheelchair or a pedestal pan and back, is one of the most physically challenging tasks in nursing care. We have developed a prototype nursing-care assistant robot that can conduct patient transfer by imitating the motion when a person holds another person on his/her back. Based on the measurement of human motions including back-chest touching, leaning forward, holding up, moving and putting down, we analyzed the key factors that may influence the safety and comfort of the patient and designed a new type of robot. The robot consists of a chest holder which moves like a human back. In this paper, we state the details of motion design and related kinematic/dynamic analysis of the robot and demonstrate its effect on patient transfer. It is demonstrated that the robot developed can transfer a subject from a bed to a chair and back.

关键词： Machine design

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Biomechanical and Physiological Evaluation of Biologically-Inspired Hip Assistance With Belt-Type Soft Exosuits

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IEEE TRANSACTIONS ON NEURAL SYSTEMS AND REHABILITATION ENGINEERING 2022年 30卷 2802-2814页

作者： Chen, Qiang Guo, Shijie Wang, Jing Wang, Jiaxin Zhang, Dan Jin, Shanhai Hebei Univ Technol Sch Mech Engn State Key Lab Reliabil & Intelligence Elect Equip Hebei Key Lab Robot Sensing & Human Robot Interac Tianjin 300401 Peoples R China Tianjin Univ Sport Key Lab Exercise Physiol & Sports Med Tianjin 301617 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China York Univ Dept Mech Engn Toronto ON M3J 1P3 Canada Yanbian Univ Sch Engn Yanji 133002 Peoples R China

Hip-assisted soft exosuits have been reported for their effect on reducing the metabolic power of human walking. Currently, most studies focus on uni-directional assistance (HF: hip flexion, or HE: hip extension). This paper investigates the effect of bi-directional assistance (HFE: hip flexion and extension) on the biomechanics and physiology of the wearer for understanding the potential benefits in synergistic effect of multi-muscle assistance. A belt-type soft exosuit was developed to provide the bi-directional assistance for augmenting walking. The assistance strategy was presented by imitating the contraction mechanisms of hip flexor and extensor muscles in walking. Tests on 8 healthy subjects were conducted and the results were compared with traditional uni-directional assistance. Metabolic powers, muscle activities, kinematics, and kinetics were measured and analyzed. Results showed that HFE assistance reduced the metabolic power by 7% and 12.4% relative to no exosuit and assistance turned off, respectively, larger than the sum of HF and HE. Furthermore, HFE reduced more total joint positive biological work and the activity of more related muscles, and at the same time increased upward and downward accelerations of body mass center, promoting walking energy exchange. These findings demonstrate that bi-directional assistance by combining hip flexion and extension has a significant synergistic effect on augmenting human walking as well as a benefit of increasing biological efficiency.

关键词： Hip Legged locomotion Muscles Actuators Belts Force Hafnium Soft exosuit hip assistance muscle contraction metabolic power synergistic effect

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Bayesian Algorithm-Based Force Profiles Optimization of Hip-Assistive Soft Exosuits Under Variable Walking Speeds

IEEE TRANSACTIONS ON MEDICAL ROBOTICS AND BIONICS

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IEEE TRANSACTIONS ON MEDICAL robotICS AND BIONICS 2024年第3期6卷 1232-1244页

作者： Chen, Qiang Wang, Jiaxin Xiang, Qian Guo, Shijie Hebei Univ Technol Engn Res Ctr Hebei Key Lab Robot Sensing & Human Robot Interact Sch Mech EngnMinist Educ Intelligent Rehabil Equi Tianjin 300401 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China Fudan Univ Inst Robot & AI Shanghai 200437 Peoples R China

Relevant research highlights humans' capacity to continuously adapt their walking speed to minimize metabolic energy consumption during overground free walking. Past studies have shown that soft exosuits assisting in hip flexion and extension can reduce metabolic costs and regulate gait parameters during human locomotion. This emphasizes the need to fine-tune hip exosuit parameters to align with walking speed, thereby enhancing metabolic efficiency. This study aims to optimize assistive force parameters of hip exosuits across different walking speeds, providing insights for optimizing force profiles in outdoor walking. We employed a human-in-the-loop approach with Bayesian optimization to determine optimal force profiles for hip assistance. Six subjects performed treadmill walking at four fixed speeds (0.84, 1.16, 1.48, and 1.8 m/s), optimizing control parameters for each speed and establishing a Bayesian experience (BXE) linking walking speed to optimal parameters. Furthermore, we developed a real-time force optimization controller based on the BXE for adjusting the force parameters of assistance. Outdoor walking experiments with the same subjects showed that BXE-optimized profiles significantly reduced metabolic costs compared to fixed profiles. This study underscores the importance of optimizing assistive forces for varying walking speeds in humans.

关键词： Optimization Legged locomotion Force Hip Bayes methods Timing Costs Soft exosuits hip assistance Bayesian optimization human-in-the-loop metabolic cost

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Flexible and Antifreezing Fiber-Shaped Solid-State Zinc-Ion Batteries with an Integrated Bonding Structure

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JOURNAL OF PHYSICAL CHEMISTRY LETTERS 2023年第14期14卷 3512-3520页

作者： Wang, Guo-Yuan Li, Guo-Xian Tang, Yu-Dong Zhao, Zhen Yu, Wei Meng, Chui-Zhou Guo, Shi-Jie Hebei Univ Technol State Key Lab Reliabil & Intelligence Elect Equipm Tianjin 300401 Peoples R China Hebei Univ Technol Hebei Key Lab Smart Sensing & Human Robot Interact Tianjin 300401 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China

Fiber-shaped solid-state zinc-ion battery (FZIB) is a promising candidate for wearable electronic devices, but challenges remain in terms of mechanical stability and low temperature tolerance. Herein, we design and fabricate a FZIB with an integrated device structure through effective incorporation of the active electrode materials with a carbon fiber rope (CFR) and a gel polymer electrolyte. The gel polymer electrolyte incorporated with ethylene glycol (EG) and graphene oxide (GO) endows the FZIB with a high Zn stripping/ plating efficiency under extreme low temperature conditions. A high power density of 1.25 mW cm-1 and large energy density of 0.1752 mWh cm-1 are obtained. In addition, a high capacity retention of 91% after 2000 continuous bending cycles is achieved. Furthermore, the discharge capacity is fairly retained at more than 22% even at the low temperature of -20 degrees C. Toward practical applications, the FZIB integrated into textiles to power electronic products is demonstrated.

关键词： Mechanical stability

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Wearable Electronic Glove and Multilayer Para-LSTM-CNN-Based Method for Sign Language Recognition

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IEEE INTERNET OF THINGS JOURNAL 2024年第24期11卷 40787-40799页

作者： Wang, Dapeng Wang, Mingyuan Zhang, Ziqi Liu, Teng Meng, Chuizhou Guo, Shijie Hebei Univ Technol Engn Res Ctr Minist Educ Intelligent Rehabil Devic State Key Lab Reliabil & Intelligence Elect Equipm Hebei Key Lab Smart Sensing & Human Robot Interact Tianjin 300401 Peoples R China Hebei Univ Technol Sch Mech Engn Tianjin 300401 Peoples R China

Communication between normal people and hearing-impaired people is usually realized with the sign language. However, the communication quality is limited by the familiarity of the people with sign language. Wearable sign language recognition systems, especially those based on flexible electronic glove, have attracted much attention due to their efficiency for sign language recognition. However, there are still two problems need to be solved in current research: 1) the size or weight of wearable device is usually inversely proportional to the fineness of the hand movement information captured and 2) both spatial features and temporal features are important for sign language recognition, and current algorithms usually do not achieve sufficient extraction. To address the above problems, a wearable electronic glove with new multilayer parallel LSTM-CNN (Para-LSTM-CNN) network is proposed. The designed wearable electronic glove is only 126 g in weight, and utilizes inertial measurement units (IMUs) and Flex sensors to capture hand motion signals. 41-dimensions of hand motion signals can be captured and uploaded to computer via Wi-Fi. A Para-LSTM-CNN algorithm based on parallel features extraction strategy is proposed. The temporal and spatial features of the sensor signals are extracted through long short-term memory (LSTM) and convolutional neural network (CNN), respectively. The Para-LSTM-CNN can effectively improve the accuracy of sign language recognition by fusing spatial and temporal features synchronously. The proposed system has a high sign-language-recognition accuracy of 97.01% for 26 gestures. Result shows that the proposed system promises to provide effective solutions for patients with hearing-impaired. The available code of Para-LSTM-CNN can be found at https://***/1104162390-A/Para-LSTM-CNN/tree/main.

关键词： Feature extraction Sign language Sensors Wearable devices Accuracy Flexible printed circuits Classification algorithms Parallel features extraction sign language recognition temporal features wearable electronic glove

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