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In situ Reduction of Silver Nanoparticles on Chitosan Hybrid Copper Phosphate Nanoflowers for Highly Efficient Plasmonic Solar-driven Interfacial Water Evaporation

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Journal of Bionic Engineering 2021年第1期18卷 30-39页

作者： Mei Zhang wanghuai xu Minfei Li Jiaqian Li Peng Wang Zuankai Wang Department of Mechanical Engineering City University of Hong KongHong Kong999077China Department of Civil and Environmental Engineering the Hong Kong Polytechnic UniversityHong Kong999077China

The development of water purification device using solar energy has received tremendous *** extensive progress,traditional photothermal conversion usually has a high cost and high environmental *** overcome this problem,we develop a low cost,durable and environmentally friendly solar *** bilayered evaporator is constructed with a thermal insulating polyvinylidene fluoride(PVDF)membrane as a bottom supporting layer and plasmonic silver nanoparticles decorated miero-sized hybrid flower(Ag/MF)as a top light-to-heat conversion *** with the sample with a flat silver film,the two-tier Ag/MF has a plasmonic enrichment property and high efficiency in converting the solar light to hcat as cach flower can gencrate a microscale hotspot by enriching the absorbed solar *** the other hand,the PVDF membrane on the bottom with porous structure not only improves the mechanicalstability of the entire structure,but also maintains a stable water supply from the bulk water to the evaporation interface by capillarity and minimizes the thermal *** combination of excellent water evaporation ability simple operation,and low cost of the production process imparts this type of plasmonic enhanced solar-driven interfacial water evaporator with promising prospects for potable water purification for point-of-use applications.

关键词： bionic plasmonic water evaporation synergistic effect Ag NPs hybrid flower

SLIPS-TENG: robust triboelectric nanogenerator with optical and charge transparency using a slippery interface

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National Science Review 2019年第3期6卷 540-550页

作者： wanghuai xu Xiaofeng Zhou Chonglei Hao Huanxi Zheng Yuan Liu Xiantong Yan Zhengbao Yang Michael Leung Xiao Cheng Zeng Ronald X.xu Zuankai Wang Department of Mechanical Engineering City University of Hong Kong Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Shanghai Key Laboratory of Multidimensional Information Processing Department of Electronic Engineering East China Normal University Department of Chemistry University of Nebraska-Lincoln School of Energy and Environment City University of Hong Kong Department of Materials Science and Engineering City University of Hong Kong

Energy harvesting devices that prosper in harsh environments are highly demanded in a wide range of applications ranging from wearable and biomedical devices to self-powered and intelligent ***, over the past several years, the innovation of triboelectric nanogenerators(TENGs) that efficiently convert ambient kinetic energy of water droplets or wave power to electricity has received growing attention. One of the main bottlenecks for the practical implications of such devices originates from the fast degradation of the physiochemical properties of interfacial materials under harsh environments. To overcome these challenges, here we report the design of a novel slippery lubricant-impregnated porous surface(SLIPS) based TENG, referred to as SLIPS-TENG, which exhibits many distinctive advantages over conventional design including optical transparency, configurability, self-cleaning, flexibility, and power generation stability, in a wide range of working environments. Unexpectedly, the slippery and configurable lubricant layer not only serves as a unique substrate for liquid/droplet transport and optical transmission,but also for efficient charge transfer. Moreover, we show that there exists a critical thickness in the liquid layer, below which the triboelectric effect is almost identical to that without the presence of such a liquid film. Such an intriguing charge transparency behavior is reminiscent of the wetting transparency and van der Waals potential transparency of graphene previously reported, though the fundamental mechanism remains to be elucidated. We envision that the marriage of these two seemingly totally different arenas(SLIPS and TENG) provides a paradigm shift in the design of robust and versatile energy devices that can be used as a clean and longer-lifetime alternative in various working environments.

关键词： slippery surface triboelectricity power generation water droplet interfaces

Rotating Surfaces Promote the Shedding of Droplets

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Research 2023年第1期6卷 583-592页

作者： Ran Tao Wei Fang Jun Wu Binhong Dou wanghuai xu Zhanying Zheng Bing Li Zuankai Wang Xiqiao Feng Chonglei Hao School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen 518055China Institute of Biomechanics and Medical Engineering Applied Mechanics LaboratoryDepartment of Engineering MechanicsTsinghua UniversityBeijing 100084China Department of Mechanical Engineering City University of Hong KongHong Kong 999077China

Achieving rapid shedding of droplets from solid surfaces has received substantial attention because of its diverse *** studies have focused on minimizing contact times of liquid droplets interacting with stationary surfaces,yet little consideration has been given to that of moving ***,we report a different scenario:A water droplet rapidly detaches from micro/nanotextured rotating surfaces in an intriguing doughnut shape,contributing to about 40%contact time reduction compared with that on stationary *** doughnut-shaped bouncing droplet fragments into satellites and spontaneously scatters,thus avoiding further collision with the *** particular,the contact time is highly dependent on impact velocities of droplets,beyond previous descriptions of classical inertialcapillary scaling *** results not only deepen the fundamental understanding of droplet dynamics on moving surfaces but also suggest a synergistic mechanism to actively regulate the contact time by coupling the kinematics of droplet impingement and surface rotation.

关键词： stationary rotating synergistic

A droplet‐based electricity generator with ultrahigh instantaneous output and short charging time

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Droplet 2022年第1期1卷 56-64页

作者： Nan Zhang Huimin Zhang wanghuai xu Haojie Gu Shimeng Ye Huanxi Zheng Yuxin Song Zuankai Wang Xiaofeng Zhou Shanghai Key Laboratory of Multidimensional Information Processing School of Communication and Electronic EngineeringEast China Normal UniversityShanghaiChina Department of Mechanical Engineering City University of Hong KongHong KongChina

The past several years have witnessed the rapid development in effectively transforming randomly distributed water kinetic energy into electrical energy,especially triggered by the emergence of droplet‐based electricity generators(DEG).Despite this,it still suffers from relatively low average power density,which is also achieved at the cost of long charging time,the time to reach stable and saturated surface charge density either through continuous droplet impingement or *** the harvested energy per droplet in DEG remains as the dominant metric,ultrahigh instantaneous output and short charging time are equally important in some specialized applications such as instantaneous ***,we conduct systematical modeling and optimization to build the link between the hydrodynamic and electrical systems,which enables us to determine ultrahigh instantaneous output and short charging time by tailoring parameters such as dielectric layer thickness,droplet ion concentration,and external *** envision that this strategy in achieving ultrahigh instantaneous output as well as shortening charging time would provide insights and design routes for water energy harvesting.

关键词： specialized charging generator

Achieving ultra-stable and superior electricity generation by integrating transistor-like design with lubricant armor

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The Innovation 2022年第5期3卷 122-128页

作者： Yuxin Song wanghuai xu Yuan Liu Huanxi Zheng Miaomiao Cui Yongsen Zhou Baoping Zhang Xiantong Yan Lili Wang Pengyu Li Xiaote xu Zhengbao Yang Zuankai Wang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Research Center for Nature-Inspired Engineering City University of Hong KongHong Kong 999077China Shenzhen Research Institute of City University of Hong Kong Shenzhen 518057China School of Chemical Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China

Extensive work have been done to harvest untapped water energy in formats of raindrops,flows,waves,and ***,attaining stable and efficient electricity generation from these low-frequency water kinetic energies at both individual device and large-scale system level remains challenging,partially owing to the difficulty in designing a unit that possesses stable liquid and charge transfer properties,and also can be seamlessly integrated to achieve preferential collective performances without the introduction of tortuous wiring and redundant node connection with external ***,we report the design of water electricity generators featuring the combination of lubricant layer and transistor-like electrode architecture that endows enhanced electrical performances in different working *** a design is scalable in manufacturing and suitable for facile integration,characterized by significant reduction in the numbers of wiring and nodes and elimination of complex interfacing problems,and represents a significant step toward large-scale,real-life applications.

关键词： integrating collective electricity

Bio-inspired water-driven electricity generators:From fundamental mechanisms to practical applications

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Nano Research Energy 2023年第1期2卷 28-44页

作者： Kaiqiang Wang wanghuai xu Wei Zhang Xiong Wang Xiao Yang Jianfeng Li Hanli Zhang Jinjin Li Zuankai Wang Department of Mechanical Engineering City University of Hong KongHong Kong 999077China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Centre for Nautre-Inspired Engineering Hong Kong 999077China Hong Kong Centre for Cerebro-Caradiovasular Health Engineering(COCHE) Hong Kong 999077China

Harvesting water energy in various forms of water motion,such as evaporation,raindrops,river flows,ocean waves,and other,is promising to relieve the global energy crisis and reach the aim of carbon ***,this highly decentralized and distributed water energy poses a challenge on conventional electromagnetic hydropower technologies that feature centralization and ***,this problem has been gradually addressed by the emergence of a myriad of electricity generators that take inspiration from natural living organisms,which have the capability to efficiently process and manage water and energy for survival in the natural *** the liquid-solid behaviors manifested in ubiquitous biological processes,these generators allow for the efficient energy conversion from water-solid interaction into the charge transfer or electrical output under natural driving,such as gravity and solar ***,in spite of the rapid development of the field,a fundamental understanding of these generators and their ability to bridge the gap between the fundamentals and the practical applications remains *** this review,we first introduce the latest progress in the fundamental understanding in bio-inspired electricity generators that allow for efficient harvesting water energy in various forms,ranging from water evaporation,droplet to wave or flow,and then summarize the development of the engineering design of the various bio-inspired electricity generator in the practical applications,including self-powered sensor and wearable ***,the prospects and urgent problems,such as how to achieve large-scale electricity generation,are presented.

关键词： bionics synergy of solid and liquid electricity generator surface treatment energy harvest

A droplet‐based electricity generator incorporating Kelvin water dropper with ultrahigh instantaneous power density

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Droplet 2024年第1期3卷 95-102页

作者： Yang Li xuezhi Qin Yawei Feng Yuxin Song Zhiran Yi Huanxi Zheng Peiyang Zhou Chenyang Wu Siyan Yang Lili Wang Pingan Zhu wanghuai xu Zuankai Wang Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Harvesting renewable water energy in various formats such as raindrops,waves,and evaporation is one of the key strategies for achieving global carbon *** recent decade has witnessed rapid advancement of the droplet‐based electricity generator(DEG)with a continuous leap in the instantaneous output power density from 50W/m2 to several kW/*** this,further pushing the upper limit of the output performance of DEG is still constrained by low surface charge density and long precharging ***,we report a DEG incorporating the Kelvin water dropper(K‐DEG)that can generate an ultrahigh instantaneous power density of 105W/m2 upon one droplet *** this design,the Kelvin water dropper continuously replenishes the high density of surface charges on DEG,while DEG fully releases these surface charges into electric output.K‐DEG with such a high output can directly light five 6‐W commercial lamps and even charge a cellphone by using falling droplets.

关键词： generator ultrahigh power

基于多Sink节点的煤矿巷道无线传感器网络路由协议

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工矿自动化 2016年第6期42卷 46-51页

作者：黎望怀夏旭湖南安全技术职业学院电气与信息工程系湖南长沙410151 中南大学软件学院湖南长沙410075

针对传统的单Sink节点无线传感器网络应用于煤矿安全监控系统中时,远离巷道口的传感器节点无法及时、准确地将巷道深处的监测数据传输到巷道口Sink节点的问题,提出一种适用于长带状结构煤矿巷道的基于多Sink节点的无线传感器网络路由协... 详细信息

针对传统的单Sink节点无线传感器网络应用于煤矿安全监控系统中时,远离巷道口的传感器节点无法及时、准确地将巷道深处的监测数据传输到巷道口Sink节点的问题,提出一种适用于长带状结构煤矿巷道的基于多Sink节点的无线传感器网络路由协议。该协议引入多Sink节点的无线传感器网络结构和非均匀成簇的思想,采用基于多Sink节点的功率控制算法和非均匀成簇算法,对各个Sink节点的最优通信半径、发射功率、簇首的选择和非均匀竞争半径的计算进行优化。仿真结果表明,该路由协议在连通度、延时和网络生存期上具有优势,可有效降低无线传感器网络整体能耗,延长网络生存期。

关键词：煤矿巷道无线传感器网络多Sink节点路由协议功率控制非均匀成簇