Device
·
2024
·
IF 0
Huping Yan,Ronghui Qi,Zhen Liu,Han Wang,Chuanshuai Dong,Li-zhi Zhang
Ambient moisture-enabled generators (MEGs) present significant potential but suffer from low efficiency. This study explored the synergistic enhancement of an electrical double layer (EDL) at the hydrogel-electrode interface in hydrogel-based MEGs, which improves directional ion movement to achieve excellent performance. Our MEGs feature asymmetric electrodes made of carbon nanotubes and a poly(acrylamide-co-acrylic acid) hydrogel as the conductive medium. The interaction between the COOH-rich hygroscopic hydrogel and the salt-doped upper electrode established a humidity gradient within the hydrogel and a strong interfacial EDL. Results indicate that the generator (1 × 1 cm 2 ) achieved an open-circuit voltage of 1.3 V, an instantaneous short-circuit current of 55.7 μA/cm 2 , and a usable power output of 2.34 μW/cm 2 . It also exhibited robust environmental adaptability, maintaining 0.8 V below 30% relative humidity (RH) and over 0.65 V between −10°C and 60°C. Unlocking the potential of EDLs significantly enhances MEG performance, broadening application prospects in distributed self-powered devices and large-scale moisture-to-energy generation.
研究领域:
材料科学
·
能源技术
·
环境工程
✓ 已验证
DOI
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 37
·19269-19277
·
IF 11.301
Tian Yang,Honglin Yuan,Sitong Wang,Xuhan Gao,Huhu Zhao,Pengying Niu,Beibei Liu,Bo Li,Huanjun Li
Natural water evaporation is a ubiquitous resource at the Earth's surface. Actuating materials that convert such evaporation energy into mechanical motions are highly desirable but challenging. Herein, tough nacre-mimetic films featuring excellent dry/wet tensile strength (294.4 MPa/182.3 MPa) are reported. Benefiting from this feature, the resultant film actuators can not only perform fast flipping motion and lasting oscillation driven by natural evaporation, but also undergo rapid turnover upon exposure to small humidity gradients on the palm of the hand. Importantly, the film actuators further exhibit exceptional actuation without fatigue when exposed to thermal water vapors. Furthermore, it is demonstrated that the stretch-induced oriented film could be used to construct a self-powered soft robot driven by water gradients. As a proof of concept, a natural evaporation-driven generator is assembled by connecting the actuators with a piezoelectric element to power a LED. These demonstrations clearly show that the biomimetic films are promising for harnessing natural evaporation to drive various self-powered devices.
研究领域:
材料科学
·
能源技术
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Hongyao Ding,Xu Yang,Bingyao Wang,Jie Liu,Bibo Yin,Wei Sang,Jinfeng Leng,Yuefang Wen,Hui Li,Xiaodong Shen
Conductive hydrogels are highly promising candidates for fabricating flexible wearable devices due to their superior biocompatibility and mechanical flexibility. However, the inferior mechanical properties and poor conductivity of conventional hydrogels greatly constrain their sensing capabilities. Herein, a tough conductive hydrogel with a semi-interpenetrating network structure was developed utilizing a two-step process involving initial drying, followed by solvent displacement with an acidic solution. Crystalline regions, multiple hydrogen bonds, and electrostatic interactions are established in hydrogels during the processes, significantly enhancing the hydrogel’s mechanical properties. The resulting hydrogels have high tensile strength and high toughness yet skin-like low modulus. The unique network structure gives this gel low hysteresis and excellent fatigue resistance in the low strain range. The presence of abundant free ions within the network results in a suitable conductivity, enabling their application as resistive-type strain sensors that demonstrate high sensitivity, excellent linear responsiveness, broad sensing window, and favorable durability, thereby showcasing significant potential for monitoring human motions. The acidic environment inside the hydrogels is conducive to their use in self-powered devices with an adequate output voltage. Sufficient output voltages can be realized by connecting multiple hydrogels in series, and a self-powered sensor is proposed that is capable of responding to strain signals through changes in output voltage without the need for an external power source. This work provides a strategy for fabricating tough conductive hydrogels with considerable promise in the fields of flexible electronics and self-powered devices.
研究领域:
材料科学
·
生物医学工程
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
BMEMat
·
2024
·
IF 0
Xinxin He,Zhiyuan Li,Xingcan Huang,Qiang Zhang,Yuyang Zeng,Jialin Li,Chun Ki Yiu,Yawen Yang,Jingkun Zhou,Guoqiang Xu,Jiachen Wang,Jian Li,Zitong Xu,Zhenlin Chen,Yiming Liu,Yuyu Gao,Binbin Zhang,Guangyao Zhao,Zhan Gao,Pengcheng Wu,Rui Shi,Yuze Qiu,Hehua Zhang,Lung Chow,Denglin Ye,Ya Huang,Xinge Yu
The importance of continuous healthcare management has significantly accelerated the development of wearable devices for monitoring health-related physical and biochemical markers. Despite extensive research on wearable devices for physiological and biochemical monitoring, critical issues of power management and device/skin interfacial properties restrict the advancement of personalized healthcare and early disease detection. Here, we report a multimodal sweat monitoring device featuring a real-time display and long-term data analysis based on self-powered format of sweat-activated batteries (SABs). The polyvinyl alcohol-sucrose (PVA-Suc) hydrogel serves as the key component for the SAB, offering not only great long-term adhesive properties for conformable wearability but also significant power generation capabilities. A maximum current density of 44.06 mA cm −2 and a maximum power density of 21.89 mW cm −2 can be realized for the hydrogel based SAB. The resulting device integrates an advanced colorimetric and electrochemical sensor array to measure pH levels, glucose concentrations, and chloride ion levels in human sweat, with data wirelessly transmitted by Near Field Communication. The self-powering features and multiple mode sensing function offer sufficient power to support real-time monitoring of metabolic biomarkers in sweat, with the ability to visually observe changes in the colorimetric sensors for long-term data monitoring.
研究领域:
生物医学工程
·
可穿戴设备
·
电化学传感
·
健康监测
·
能源收集
✓ 已验证
DOI
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Tuo Li,Huige Wei,Yingying Zhang,Tong Wan,Dapeng Cui,Shixiang Zhao,Teng Zhang,Yanxiu Ji,Hassan Algadi,Zhanhu Guo,Liqiang Chu,Bowen Cheng
Strong and ductile sodium alginate (SA) reinforced polyacrylamide (PAM)/xanthan gum (XG) double network ionic hydrogels were constructed for stress sensing and self-powered wearable device applications. In the designed network of PXS-M n+ /LiCl (short for PAM/XG/SA-M n+ /LiCl, where M n+ stands for Fe 3+ , Cu 2+ or Zn 2+ ), PAM acts as a flexible hydrophilic skeleton, and XG functions as a ductile second network. The macromolecule SA interacts with metal ion M n+ to form a unique complex structure, significantly improving the mechanical strength of the hydrogel. The addition of inorganic salt LiCl endows the hydrogel with high electrical conductivity , and meanwhile reduces the freezing point and prevents water loss of the hydrogel. PXS-M n+ /LiCl exhibits excellent mechanical properties and ultra-high ductility (a fracture tensile strength up to 0.65 MPa and a fracture strain up to 1800%), and high stress-sensing performance (a high GF up to 4.56 and pressure sensitivity of 0.122). Moreover, a self-powered device with a dual-power-supply mode, i.e., PXS-M n+ /LiCl-based primary battery and TENG, and a capacitor as the energy storage component was constructed, which shows promising prospects for self-powered wearable electronics.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small Methods
·
2023
·Vol. 7
·期 6
·2201659
·
IF 12.4
Ran Xiao,Fenfen Wang,Li Luo,Xincheng Yao,Yongchao Huang,Zhongmin Wang,M.-Sadeeq Balogun
The exploration of cost-effective multifunctional electrodes with high activity toward energy storage and conversion systems, such as self-powered alkaline water electrolysis, is very meaningful, although studies remain quite limited. Herein, a heterogeneous nickel-molybdenum (NiMo)-based electrode is fabricated for the first time as a trifunctional electrode for asymmetric supercapacitor (ASC), hydrogen evolution reaction, and oxygen evolution reaction. The trifunctional electrode consists of Ni 4 Mo and MoO 2 (denoted Ni 4 Mo/MoO 2 ) with hierarchical nanorod heterostructure and abundant heterogeneous nanointerfaces creating sufficient active sites and efficient charge transfer for achieving high performance self-power electrochemical devices. The ASC consists of the as-prepared Ni 4 Mo/MoO 2 positive electrode, showing a broad potential window of 1.6 V, and a maximum energy density of 115.6 Wh kg −1 , while the alkaline overall water splitting (OWS) assembled using the as-prepared Ni 4 Mo/MoO 2 as bifunctional catalysts only requires a low cell voltage of 1.48 V to achieve a current density of 10 mA cm −2 in aqueous alkaline electrolyte. Finally, by integrating the Ni 4 Mo/MoO 2 -based ASC and OWS devices, an aqueous self-powered OWS is assembled, which self-power the OWS to generate hydrogen gas and oxygen gas, verifying great potential of the as-prepared Ni 4 Mo/MoO 2 for sustainable and renewable energy storage and conversion system.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Chao Feng,Baofeng Xu,Weixiong Luo,Haifeng Liao,Zhenhua Qiu,Jianwei Guo
The application of flexible sensors based on conductive hydrogels in human motion monitoring has been widely studied. Here, a facile one-pot method is proposed to prepare nanocellulose/polyacrylamide/sodium alginate hydrogel (CNWs/SA/PAM). The resulting CNWs/SA/PAM hydrogel has exceptional mechanical properties (7850 %, 1.3 MPa) and high sensitivity (14200 %, GF=3.6, 68 ms). The nanocellulose crystals (CNWs) are bent and entangled with the backbone of the polyacrylamide/sodium alginate (PAM/SA) hydrogel network, effectively transferring external mechanical forces to the entire physical and chemical cross-linking domains. This feature considerably improves the tensile strength, strain sensing range, and sensitivity of the hydrogel. The CNWs/SA/PAM hydrogel exhibits a sensitive response to water molecules and temperature-stimulated shape memory behaviour and can act as a programmable deformation actuator. The hydrogel sensor can detect and monitor subtle human motion signals in a timely and accurate manner. It is designed as a single-electrode friction nanogenerator insole (insole-TENG) that can monitor the large motion states of the human body in real time and can be efficiently used for small self-powered electronic devices. This study will shed some light on developing cellulose hydrogels in multifunctional human motion health detection sensors, soft-actuated robots, and self-powered applications for small electronic devices.
研究领域:
材料科学
·
生物医学工程
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Ying Su,Chunhui Ma,Weilin Chen,Xueying Xu,Qingxin Tang
As one of the important friction materials for the construction of high-efficiency triboelectric nanogenerators (TENGs), polydimethylsiloxane (PDMS) has the advantages of high flexibility and transparency. However, the performance of pristine PDMS-based TENGs is not high enough, which limits its practical application. Polyoxometalates (POMs), as a class of nanoscale cluster compounds, have a strong ability to capture electrons. Appropriate POM materials can not only build nanostructures on the surface of PDMS without affecting its flexibility and transparency but also improve its surface roughness and enhance the ability to store charges, thereby enhancing the performance of TENGs. In this study, PDMS is modified by two kinds of Dawson-type POMs, and two POMs-TENGs are further constructed, named W-TENG and Mo-TENG, respectively. Performance tests show that the Mo-TENG exhibits an output voltage of 30 V and an output current of 500 nA, which are three times and twice that of the pristine PDMS-based TENG, respectively. This enhancement is attributed to POMs dispersed in the PDMS, which increase surface potential, surface roughness, and electronegativity. Finally, the application potential of Mo-TENG in wearable self-powered devices is demonstrated. This study expands the range of applications for POMs and provides an efficient and cost-effective method for the commercial manufacture of biosensors and self-powered devices.
研究领域:
材料科学
·
能源技术
·
纳米科技
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·Vol. 37
·期 43
·e08689
·
IF 26.8
Qizeng Sun,Guozhang Ren,Ren Yan,Songzhu Luo,Tikang Wang,Ligao Chen,Gang Lu,Wei Huang,Hai-Dong Yu
With the development of the Internet of Things and intelligent robots, there is an increasing demand for distributed flexible sensor networks and portable power devices. As a self-powered sensor and micro/nano powering supplier, triboelectric nanogenerator (TENG) that can convert the irregular and ubiquitous mechanical energy into electrical energy demonstrates promising applications in human–machine interaction, soft robotics, wearable healthcare, etc. However, achieving ultrahigh current density and water resistance in TENGs remains challenging, mainly due to the non-utilization of the electrons in the interior of triboelectric layers. Herein, it is proposed that linking the electron cloud potential wells (ECPWs) of triboelectric materials can lead to a huge increase in the output current of TENGs. This hypothesis is verified by embedding a conductive network of reduced graphene oxide (rGO) into the triboelectric layers of ethyl cellulose (EC) and polydimethylsiloxane (PDMS). The TENG based on this model demonstrates a record-high current density of ≈3533 mA m −2 among the TENGs working in contact-separation mode. In addition, this TENG shows excellent endurance in high-humidity and even rainy environments. This work provides a novel and promising strategy for fabricating TENGs with ultrahigh output current and water resistance, largely expanding their practical applications in many fields.
研究领域:
纳米技术
·
能量收集
·
柔性电子学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Jie Lu,XiaoLong Zhu,Yuting Zhang,Fuyou Wang,Hui Xie,Lizhen Guo,He Liu,Xu Xu
Hydrogel electrolytes hold significant promise for flexible and wearable electronics but often suffer from limited ionic conductivity, poor mechanical integrity, and vulnerability to extreme environmental conditions. Herein, a cellulose-integrated conductive hydrogel electrolyte (MCBH-Zn) with outstanding mechanical strength and freeze resistance is reported. The MCBH-Zn hydrogel achieves a high compressive strength of 5.16 MPa and a tensile fracture stress of 312 kPa, enabled by the synergistic effects of a covalently cross-linked polyacrylamide (PAM) network, hydrogen bonding between PAM and cellulose, and coordination interactions between bentonite (BT) and cellulose. Additionally, it delivers excellent ionic conductivity of 88.9 mS cm–1 at room temperature and 27.3 mS cm–1 at −60 °C. Consequently, a flexible solid-state zinc-ion hybrid supercapacitor (MCBH-ZHSC) assembled with MCBH-Zn delivers stable electrochemical behavior across a wide temperature range and maintains a superior capacity retention of 93% after 10,000 cycles at 10.0 A g–1. Furthermore, the MCBH-Zn-based wearable device demonstrates self-sustained flexibility and efficient energy harvesting and conversion. This work offers a facile strategy for engineering high-performance hydrogel electrolytes tailored for next-generation wearable technologies.
研究领域:
材料科学
·
高分子科学
·
储能技术
·
柔性电子学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jianhan Sun,Kun Gao,Xiangyun Lin,Chang Gao,Dan Ti,Zhipan Zhang
Self-powered devices have great potential in daily applications ranging from portable electronics to wearable body sensors, yet their working lifetime and performance are normally limited by the low energy density of the power unit as well as additional resistive losses induced by connections between electronic and power moieties. Herein, we report an effective programmable laser-assisted fabrication of facilely integrated microphotocapacitors (integrated devices of solar cells and microsupercapacitors, mPCs) exhibiting high output voltage and energy density (32.3 μWh cm–2). An mPC pack (8 mPCs in series within a size of 3 × 3 cm2) delivers an excellent Voc of 7.3 V, and an output voltage of 90 V can be obtained with an array of 14 mPC packs when tested outdoors under solar illumination (63 mW cm–2), setting a new benchmark for integrated self-charging power packs. These devices have also shown good stability (stable operation over 2000 cycles, 2.1 × 104 s) and performance under low- or intermittent-intensity light illuminations, highlighting their abilities to work indoors or under cloudy weather.
研究领域:
材料科学
·
纳米技术
·
能源存储
·
光子学
·
电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Tong-Yu Li,Wen-Hao Geng,Ze-Long Bao,Peng-Fei Qian,Yu-Long Guo,Hong-Zhang Geng
Flexible thermoelectric materials hold great promise for wearable electronics and self-powering. However, p-type thermoelectric materials that combine multifunctionality, high performance and long-term stability are scarce. Here, we developed a flexible p-type TE-Fabric with excellent stress/thermoelectric sensing and electrical heating properties through molecular engineering strategies. It is worth noting that during the preparation of TE-Fabric, we found that dopamine modification could enable the ordered orientation of PEDOT:PSS. The dopamine-modified PEDOT: PSS treated with multi-layer superposition HCl can greatly improve the electrical conductivity of thermoelectric materials (2040.8 S·cm −1 ), while retaining the partial orientation of PEDOT. The TE-Fabric obtained through layer-by-layer self-assembly achieves a double breakthrough in Seebeck coefficient (27.3 μV·K −1 ) and electrical conductivity (2431.2 S·cm −1 ), while exhibiting excellent mechanical flexibility (elongation at break of 71.1 %, breaking strength of 14.8 MPa) and high-performance stability. Taking advantage of TE-Fabric's high conductivity characteristics, we found that TE-Fabric was able to produce a high efficiency thermal response (93.1 % electro-thermal conversion efficiency, 177.1 °C) at low voltage (5 V). At the same time, the flexibility and high-performance stability supported the advantage of TE-Fabric in stress sensing, with a fast response (0.213 to 0.218 s). The thermoelectric device constructed by alternating six sets of flexible p-type TE-Fabric and flexible n-type nickel sheets produces an output voltage of 9 mV at a temperature difference capable of 60 K. Based on this feature, we combine the thermoelectric generator with a mask to make a breath detection sensor device. By outputting different voltage signals, we can monitor the health status of human body in real time during deep breathing, static breathing, rapid wheezing and coughing. This pioneering work opens up new avenues for the development of flexible P-type TE materials with high stability and versatility.
研究领域:
材料科学
·
纳米技术
·
热电材料
·
柔性电子学
·
可穿戴传感器
·
能量转换
·
自供电设备
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）