MACROMOLECULES
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2025
·
IF 5.2
Yiting Zhang,Jiahui Sun,Yufeng Wang,Yunchen Wu,Chun Huang,Xu Zhang,Chao Zhang,Tianxi Liu
Daytime passive radiative cooling is a highly desirable technology for cooling objects exposed to direct sunlight, offering a sustainable and energy-efficient solution without the need for electricity. However, widespread implementation of this cooling method is hindered by the complex preparation process and limited cooling power of existing radiative cooling materials. Herein, a simple and sustainable ambient humidity-induced phase separation approach was proposed for the fabrication of porous fluoropolymer films with unique hierarchical structures. This method is based on the exchange from DMSO (good solvent) to H2O (poor solvent), where interactions within and between the poly(vinylidene fluoride) (PVDF) and poly(vinyl alcohol) (PVA) are first inhibited and then restored, leading to polymer dissolution and cross-linking. The PVA-coated granular PVDF was phase-separated from the solution by controlling the rate of solvent exchange, resulting in the formation of film with graded micro- and nanoporosity upon freeze-drying. The porous fluoropolymer film exhibits an exceptional spectral performance with an infrared emissivity exceeding 97.6% within the atmospheric window and a high sunlight scattering capability of 95.3%. When subjected to direct sunlight, the porous fluoropolymer film is capable of achieving an average net radiative cooling power of 76.09 W m–2, rendering it to cool objects by 7.5 °C. Moreover, the film demonstrates mechanical flexibility and environmental stability, enabling its application on irregularly shaped cooling surfaces. This study therefore introduces a promising avenue for the cost-effective and large-scale production of radiative cooling porous materials.
研究领域:
材料科学
·
可持续能源技术
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产品关联
DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Nasir Ali,Xiaoyu Wang,Sajid Rauf,Sanam Attique,Amir Khesro,Shahid Ali,Naveed Mushtaq,Haibo Xiao,Chang Ping Yang,Huizhen Wu
Owing to their high efficiency and extended environmental stability, hybrid 2D/3D-perovskites (HPVKs) are gaining an increasing interest in the field of organometal halide perovskite solar cells (PSCs). In HPVKs, the 3D component acts as an active material, where its 2D-counterpart provides protection against environmental factors. Here in, we add dodecylammonium-chloride (DACl) into the precursor solution of 3D-perovskites (FAMAPbI 3 ) to achieve HPVKs. The formation of HPVK is confirmed by XRD, optical absorption, and Fourier-transform infrared (FTIR) spectroscopies. The structural and optical analysis affirmed that in the case of HPVKs, not only the crystallinity of perovskites is improved significantly but also a variation in its structural properties and optical bandgap have occurred. It is also observed that the surface morphologies of HPVK films are considerably improved with the incorporation of DACl. A minute amount of CsI is also added into the precursor solution of HPVKs, which further assist the formation of HPVKs and consequently causes a significant increase in the carrier lifetime. Finally, a solar cell made of HPVKs shows an improved PCE than pure 3D-perovskites. All HPVKs films and solar-cells are prepared in the ambient humidity and found to be more hydrophobic and stable, not only under relative humidity >50% but also under high thermal stress of 85 ℃.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhaoqing Lu,Nana Wang,Li Hua,Bin Wang,Shanshan Chen,Rui Cheng
Moisture-driven energy generators (MEGs) represent a renewable energy technology, yet challenges such as environmental humidity dependence and transient power generation behavior hinder their practical applications. Herein, a high-performance bilayer MEG is developed by integrating MXene-impregnated paper with a polyacrylamide (PAM) hydrogel to realize environmental tolerance and sustained power generation. Electronegative MXene and paper with 3D porous structure synergistically facilitate selective transport of positive charge, while the hydrogel serves as a water reservoir to provide a moist environment and migratory ions. The MXene-impregnated paper-hydrogel MEG (MPH-MEG) delivers a maximum open-circuit voltage (V oc ) of 0.537 V and power density of 4.8 μW cm −2 at 40 % relative humidity (RH). Moreover, by replacing water in the hydrogel with sodium lactate, the MXene-impregnated paper-organic hydrogel MEG (MPO-MEG) exhibits enhanced water retention, showing a stable V oc of ∼350 mV for over 7 days, even at 40 % relative humidity (RH). Furthermore, the scalable integration of MPO-MEG units demonstrates practical application for powering commercial timers and LEDs. This work presents a novel and facile strategy for preparing high-performance and environmentally stable MEGs for sustained power generation without the need for an additional humid environment.
研究领域:
可再生能源
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材料科学
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纳米技术
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Lei Yi,Quanmao Wei,Yingqi Hou,Jinhe Shi,Shichao Niu,Shile Feng,Yahua Liu,Yu Sun,Lei Zhao
Moisture electricity generator (MEG) has emerged as a promising technology to directly harvest energy from the ambient atmosphere. However, their practical applications remain limited by inefficient ion transport. In this work, a high-performance, polysaccharide-based step-gradient MEG (SG-MEG) is presented, fabricated by the sequential multilayer casting-drying of polysaccharide materials with varying functional group densities. This design creates an intrinsic step-wise ionic gradient, promoting ion dissociation and diffusion. As a result, a single unit can sustain an open-circuit voltage of 0.78 V for over 1300 h, a milliamp-scale short-circuit current density of 1.1 mA cm −2 and an improved power density of 15.49 µW cm −2 (1291 W m⁻ 3 ), representing a ten-fold enhancement compared to conventional MEG. Numerical simulations and experimental analyses confirm that the enhanced performance arises from the high functionalization of polysaccharide and the facilitated ion diffusion enabled by the step gradient.The multifunctionality of SG-MEG is demonstrated in practical applications, including self-powered respiration monitoring, direct powering of low-power electronics, and integration with energy storage systems for autonomous devices such as a self-cruising boat and a water-level alarm. This work offers a new paradigm for the design of high-performance, bio-based MEGs and advances their application.
研究领域:
能量收集
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材料科学
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生物基材料
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离子传输
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可持续能源
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柔性电子器件
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Na Huang,Ning Zhao,Ce Zhang,Chunhao Li,Xia Wei,Yang Zhang,Yongsheng Bao,Shuai Wang
Based on the goal to improve the humidity index of the microenvironment and enhancing human comfort, this study used electrospinning to prepare several photoresponsive films with reversible regulation of wettability and microenvironmental humidity from copolymers of acrylated spiropyran (SPA), N-isopropylacrylamide (NIPAm), and methyl methacrylate (MMA). According to the photoisomerization mechanism of spiropyran, the simple ultraviolet (UV)–visible light (vis) reversible light radiation change makes the spiropyran unit switch between the polar ring-opened form and the nonpolar ring-closed form. Utilizing this transition can easily regulate the wettability of the film surface and microenvironmental humidity. The experimental results show that poly(SPA1-co-NIPAm2-co-MMA8) nanowire film has the best ability to regulate wettability and humidity; the wettability can vary within a range of 13° and the microenvironmental humidity up to 7.2%.
研究领域:
材料科学
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化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-8
·
IF 17.694
Tan Jin,Fang Sunmiao,Zhang Zhuhua,Yin Jun,Li Luxian,Wang Xiang,Guo Wanlin
Generating sustainable electricity from ambient humidity and natural evaporation has attracted tremendous interest recently as it requires no extra mechanical energy input and is deployable across all weather and geography conditions. Here, we present a device prototype for enhanced power generation from ambient humidity. This prototype uses both heterogenous materials assembled from a LiCl-loaded cellulon paper to facilitate moisture adsorption and a carbon-black-loaded cellulon paper to promote water evaporation. Exposing such a centimeter-sized device to ambient humidity can produce voltages of around 0.78 V and a current of around 7.5 μA, both of which can be sustained for more than 10 days. The enhanced electric output and durability are due to the continuous water flow that is directed by evaporation through numerous, negatively charged channels within the cellulon papers. The voltage and current exhibit an excellent scaling behavior upon device integration to sufficiently power commercial devices including even cell phones. The results open a promising prospect of sustainable electricity generation based on a synergy between spontaneous moisture adsorption and water evaporation.
研究领域:
能源技术
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Materials Au
·
2025
·
IF 6.5
Jinqi Hou,Xigang Zhu,Lu Zheng,Weiwei Li,Jiuwei Gao,He Huang,Yue Li,Manzhang Xu,Xuewen Wang
Flexible humidity sensors have attracted widespread attention for their potential applications in telemedicine, motion detection, etc. Compared with conventional humidity sensors, flexible humidity sensors have advantages in flexibility, integration, and portability. However, reported flexible humidity sensors usually suffer from a low response, complex manufacturing processes, and poor stability. We fabricate a humidity sensor using a graphene/polymer composite as the sensitive material with a focus on improving the response and simplifying the manufacturing process. Then, we optimize the performance of the prepared flexible sensor by component design. The prepared flexible humidity sensor has a response of 1123%, and response and recovery times of 61.1/92.0 s, respectively, showing excellent humidity sensing performance. The human respiration, skin humidity field, and environmental humidity detection applications are successfully realized by the humidity sensor. Besides, the contactless gesture monitoring is accomplished by the humidity sensor array, demonstrating the potential for further development into healthcare and contactless human–machine interaction.
研究领域:
生物医学工程
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柔性电子学
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传感技术
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转化医学
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人机交互
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可穿戴设备
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生理信号监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiuli Xie,Xiaotong Wang,Yang Zhang,Long Fang,Jiangshan Feng,Shaohong Liu,Dingshan Yu,Fangming Zhu,Xudong Chen
Herein, we develop a new intelligent moisture-sensitive hybrid aerogel by evenly embedding a proton-conductive covalent organic framework (COF-2SO3H) into a carboxylated cellulose nanofiber network (CNF-C) for water harvesting and spontaneous sustained electricity production from ambient humidity and human respiration. Our strategy first exploits the “suspending agent” role of CNF-C to stably disperse COF materials in water for forming uniform hierarchical hybrid structures. By utilizing the synergy of COF-2SO3H and CNF-C together with their inherent structure merits and surface group effects, the hybrid aerogel displays increased water uptake and ion conductivity. Upon asymmetric moisturization, it can create a self-maintained moisture gradient to engender a concentration difference for mobile Na+ and H+, resulting in efficient charge separation and diffusion. Thus, the hybrid aerogel-based coin-type generator achieves a continuous output voltage of ∼0.55 V for at least 5 h in ambient environments in contrast to that using pure CNF-C and carbon-based generators with transient voltage response. Intriguingly, the wearable generator with an aerogel in a mask is more sensitive to human respiration and achieves repeatable and reliable self-charge for persistent electricity along with an increased output voltage of up to 1.0 V and much faster self-charge (only 3 min), both of which surpass most reported moisture-enabled generators.
研究领域:
材料科学
·
能源
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环境科学
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纳米技术
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Haitao Ye,Zhiqiang Feng,Wei Zhou,Yingle Tao,Haiqing Li
Leveraging hygroscopic sorbents for moisture extraction presents a versatile pathway for atmospheric water harvesting (AWH) and microenvironment humidity control, highlighting the critical need for cost-effective and environmentally friendly production of advanced moisture sorbents. To this end, a facile and green confined-bubbling strategy has been developed for cost-effective fabrication of hygroscopic Janus-structured eutectic gels (JEGs), consisting of a porous body covered by a non-porous layer. This unique structure and composition impart JEGs with large air exposure surfaces and remarkable light-trapping capability, leading to significantly enhanced moisture capture and solar-driven water desorption efficiency compared to conventional eutectic gels. When employed as moisture sorbents in a solar-driven AWH system, JEGs achieve a freshwater production rate of 0.78 L H2O kg JEG3 −1 d −1 during a single harvesting cycle under real-world outdoor conditions. Furthermore, JEGs inherently provide passive microenvironment humidity regulation within the range of 38.8–51.3 % relative humidity, making them ideally suitable for fresh food storage and preservation. The confined-bubbling strategy thus provides an environmentally friendly and cost-effective method for producing Janus-structured eutectic gels, representing a new class of moisture sorbents with significant potential for both AWH and microenvironment regulation applications.
研究领域:
材料科学
·
环境工程
·
可持续技术
·
化学工程
·
应用物理
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhen-Dong Lian,Bo Wang,Zhi-Sheng Wu,Hao Lin,Shan-Shan Yan,Jie-Lei Li,Kang Zhang,Qing-Guang Zeng,Jin-Cheng Xu,Shi Chen,Shuang-Peng Wang,Kar Wei Ng
CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) have shown great potential in numerous applications including wide color gamut display and lighting. Despite the wonderful luminescence properties, the inherent instability of these NCs hinders their use in practical situations. Herein, we report a facile aqueous-based, ligand-free method to synthesize highly stable CsPbX3 NCs using ZIF-62, a metal–organic framework, as an encapsulation matrix which effectively isolates CsPbX3 from the surrounding. We discovered that the slightly alkaline nature of ZIF-62 facilitates the reaction between water and PbBr2 to form PbBr(OH), which not only passivates the surface defects of the CsPbBr3 NCs but also prevents the perovskite from decomposing or oxidizing at high temperature. Sintering of ZIF-62 can therefore be performed in air at ∼300 °C to completely seal the perovskite within the insulating matrix, resulting in CsPbBr3/ZIF-62 composites exhibiting high stability against polar solvents, heat, light, and ambient humidity. Notably, the composite can maintain its bright luminescence without noticeable degradation in water for more than 2 months. The narrow-band emission and stability of these composites led to the demonstration of white light-emitting diodes with excellent color stability. Without the need for organic solvents during NC synthesis and noble gas ambient during sintering, the strategy proposed here can potentially facilitate the cost-effective, large-scale synthesis of highly stable perovskites which show great promise in commercial applications.
研究领域:
材料科学
·
纳米技术
·
光电技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Wenjie Zeng,Chenguang Jiang,Defeng Wu
Bilayer hydrogel-based actuators have attracted much interest because inhomogeneous structures are easily constructed in hydrogels. We used three kinds of polysaccharides, including anionic carboxymethyl cellulose (CMC), cationic chitosan (CS), and amphoteric carboxymethyl chitosan (CMCS), as both structure-constructing units and actuation-controlling units in this work to fabricate physically crosslinked poly(vinyl alcohol) bilayer hydrogels. The spatial heterogeneity was tuned by changing the types and concentrations of polysaccharides in different layers, to regulate pH- and humidity-driven actions of bilayer hydrogels. Based on the distortion of the ionic channel during the humidity-motivated deformation of bilayer hydrogels, a two-in-one flexible device integrating a humidity-driven actuator and humidity-responsive sensor was then developed, which could detect the alterations of environmental humidity in real time. Moreover, good tensile toughness and interfacial bonding as well as the strain–resistance effect endowed the bilayer hydrogels with the capability of identifying human motion as a strain sensor, unlocking more application scenarios. This work provides an overall insight into the heterogeneity regulation of bilayer hydrogels using polysaccharides as stimulus-responsive units and also proposes an interesting strategy of manufacturing hydrogel-based flexible devices with both actuating and sensing capabilities.
研究领域:
材料科学
·
生物医学工程
·
化学工程
·
传感器与执行器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Xiangsheng Han,Lili Lv,Daoyong Yu,Xiaochen Wu,Chaoxu Li
One-dimensional organic nanomaterials with a combination of electric conductivity, flexibility, and mechanical robustness are highly in demand in a variety of flexible electronic devices. Herein, conducting polymers were combined with robust Kevlar nanofibrils (aramid nanofibrils, abbreviated as ANFs) via in situ polymerization. Owing to the strong interactions between ANFs and conjugated polymers, the resultant core–shell ANFs showed high electric conductivity in combination with flexibility, robustness, physical stability, and endurance to bending and solvents, in sharp contrast to many inorganic conductive nanomaterials. Due to their responsivity of conductivity to different stimuli (e.g., humidity and strain), their membranes were capable not only of sensing human motions and speech words, but also of showing high sensitivity to variation of environmental humidity. In such a way, these core–shell ANFs may pave the way for combining both conductivity and mechanical properties applicable for diverse wearable devices.
研究领域:
材料科学
·
纳米技术
·
柔性电子
·
可穿戴设备
·
传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）