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Low-frequency blue energy harvesting for sustainable and active anticorrosion

Nano Research 2023年第9期16卷 11871-11877页

作者： Miaomiao Cui Yawei Feng Hao wu Yuankai Jin wanbo Li zuankai w.ng Department of Mechanical Engineering City University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China Interdisciplinary Research Center for Engineering Science School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Engineering materials serving in marine surroundings are inevitably *** corrosive marine conditions can also be utilized to harvest kinetic ocean wave energy to solve this *** water–solid triboelectrification to harvest lowfrequency wave energy for active anticorrosion is *** techniques are efficient in harnessing environmental energy with frequencies higher than 3 Hz,whereas the dominated ocean waves with optimal wave spectral density fluctuate from 0.45 to 1.5 ***,we proposed a highly efficient and sustainable blue energy-powered cathodic protection(BECP)strategy by fusing water–solid triboelectric nanogenerators and cathodic protection *** the highly efficient triboelectrification between the moving water and hydrophobic fluorinated ethylene propylene tube,we developed the built-in power module,enabling the harvest of ocean wave energy lower than 1.5 *** generated volumetric current density is 28.9 mA·m^(-3),5–20 times higher than the values of the reported ***,the proposed BECP performs comparably to conventional cathodic protection in corrosion ***,the proposed approach can be easily applied to ships,buoys,and other offshore platforms to simultaneously realize blue energy harvesting and engineering material protection,providing an alternative to traditional active protection technology.

关键词： corrosion inhibition blue energy harvesting triboelectric nanogenerator cathodic protection

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Preparation of shape-controlling VO2（M/R） nanoparticles via one-step hydrothermal synthesis

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Frontiers of Optoelectronics 2021年第03期14卷 311-320页

作者： Yuchao LI Fengyu KOng Bin w.ng Yanhua ZHAO zuankai w.ng Department of Mechanical Engineering City University of Hong Kong Shenzhen Research Institute of City University of Hong Kong Ningbo University of Technology Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences

In this study, we developed a facile one-step hydrothermal process that allows to synthesize high-purity VO2（M/R） nanoparticles with various morphologies such as nanorods, nanogranules, nanoblocks, and nanospheres.w dopants are successfully implanted in VO2（M/R） unit cells with high doping efficiency, which allows to regulate the size, morphology, and phase of obtained *** underlying regulation mechanism is presented in detail to reveal how hydrothermal products vary with w doping contents, which provides a synthetic strategy for the preparation of shape-controlling VO2（M/R） nanoparticles with high purity to satisfy different specific demands for corresponding applications in the field of thermochromic smart windows.

关键词： one-step hydrothermal w doping shapecontrolling VO2(M/R) nanoparticles

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Hydrodynamic constraints on the energy efficiency of droplet electricity generators

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Microsystems & Nanoengineering 2021年第3期7卷 209-218页

作者： Antoine Riaud Cui w.ng Jia Zhou w.nghuai Xu zuankai w.ng State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai200433China Department of Mechanical Engineering City University of Hong KongHong Kong999077China

Electric energy generation from falling droplets has seen a hundred-fold rise in efficiency over the past few ***,even these newest devices can only extract a small portion of the droplet *** this paper,we theoretically investigate the contributions of hydrodynamic and electric losses in limiting the efficiency of droplet electricity generators(DEG).we restrict our analysis to cases where the droplet contacts the electrode at maximum spread,which was observed to maximize the DEG ***,the electro-mechanical energy conversion occurs during the recoil that immediately follows droplet *** then identify three limits on existing droplet electric generators:(i)the impingement velocity is limited in order to maintain the droplet integrity;(ii)much of droplet mechanical energy is squandered in overcoming viscous shear force with the substrate;(iii)insufficient electrical charge of the *** all these effects,we found that up to 83%of the total energy available was lost by viscous dissipation during *** this loss by using cascaded DEG devices to reduce the droplet kinetic energy may increase future devices efficiency beyond 10%.

关键词： viscous constraints limiting

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Preparation of shape-controlling V0_(2)(M/R)nanoparticles via one-step hydrothermal synthesis

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Frontiers of Optoelectronics 2021年第3期14卷 311-320页

作者： Yuchao LI Fengyu KOng Bin w.ng Yanhua ZHAO zuankai w.ng Department of Mechanical Engineering City University of Hong KongHong Kong 999077China Shenzhen Research Institute of City University of Hong Kong Shenzhen 518057China Ningbo University of Technology Ningbo 315211China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China

In this study,we developed a facile one-step hydrothermal process that allows to synthesize high-purity V0_(2)(M/R)nanoparticles with various morphologies such as nanorods,nanogranules,nanoblocks,and nanospheres.w dopants are successfully implanted in V02(M/R)unit cells with high doping efficiency,which allows to regulate the size,morphology,and phase of obtained *** underlying regulation mechanism is presented in detail to reveal how hydrothermal products vary with w doping contents,which provides a synthetic strategy for the preparation of shape-controlling V02(M/R)nanoparticles with high purity to satisfy different specific demands for corresponding applications in the field of thermochromic smart windows.

关键词： one-step hydrothermal w doping shapecontrolling VO_(2)(M/R)nanoparticles

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Stretchable magnesium-air battery based on dual ions conducting hydrogel for intelligent biomedical applications

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InfoMat 2023年第3期5卷 45-57页

作者： Xingcan Huang Yiming Liu wooyoung Park Zhao Zhao Jiyu Li Chee Kent Lim Tsz Hung w.ng Chun Ki Yiu Yuyu Gao Jingkun Zhou HuLi Ling Zhao Jian Li Binbin Zhang Ya Huang Rui Shi Dengfeng Li Jiaying Mo Jinpei w.ng Chao Zhang Yuhang Li zuankai w.ng Xinge Yu Department of Biomedical Engineering City University of Hong KongKowloonHong Kongthe People's Republic of China Institute of Solid Mechanics Beihang University(BUAA)Beijingthe People's Republic of China Hong Kong Center for Cerebra-Cardiovascular Health Engineering Hong Kong Science ParkKowloonNew TerritoriesHong Kongthe People's Republic of China School of Energy and Environment City University of Hong KongKowloonHong Kongthe People's Republic of China Department of Mechanical Engineering City University of Hong KongKowloonHong Kongthe People's Republic of China Aircraft and Propulsion Laboratory Ningbo Institute of Technology Beihang University(BUAA)Ningbothe People's Republic of China Shenzhen Research Institute City University of Hong Kong Shenzhenthe People's Republic of China

Flexible and bio-integrated electronics have attracted great attention due to their enormous contributions to personalized medical *** sources,serving as one of the most important components,have been suffering from many problems,including deficient biocompatibility,poor stretchability,and unstable electrical outputs under deformed conditions,which limits the practical applications in flexible and bio-integrated ***,we reported a fully stretchable magnesium(Mg)–air battery based on dual-ions-conducting hydrogels(SDICH).The high-performance battery enables long-term operation with lighting 120 lighting emitting diodes(LEDs)for over 5 *** from the advanced materials and mechanical designs,the battery exhibits stability electrical outputs under stretching,which allows to operate ordinarily under various mechanical deformations without performance ***,the great biocompatibility of the battery offers great opportunity for biomedical applications,which is demonstrated by a self-adaption wound dressing *** in vitro and in vivo results prove that the self-adaption wound dressing can effectively prevent wound inflammation and promote wound *** exploiting thermal feedback mechanics,the system can adjust antibiotic release rate and dosage spontaneously according to the real-time wound *** proposed fully stretchable Mg-air battery and self-adaption wound dressing display great potential in skin-integrated electronics and personalized medicine.

关键词： bioelectronics flexible electronics Mg-air battery stretchable battery wound healing

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