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Paper-based aqueous Al ion battery with water-in-salt electrolyte

Green Energy & Environment 2023年第5期8卷 1380-1388页

作者： Yifei Wang Wending Pan Kee Wah Leong Yingguang Zhang Xiaolong Zhao Shijing Luo Dennis Y.C.Leung School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518055China Department of Mechanical Engineering The University of Hong KongHong KongChina

Low-cost,flexible and safe battery technology is the key to the widespread usage of wearable electronics,among which the aqueous Al ion battery with water-in-salt electrolyte is a promising *** this work,a flexible aqueous Al ion battery is developed using cellulose paper as *** water-in-salt electrolyte is stored inside the paper,while the electrodes are either printed or attached on the paper surface,leading to a lightweight and thin-film battery ***,this battery can tolerate a charge and discharge rate as high as 4 A g^(-1) without losing its storage *** charge voltage is around 2.2 V,while the discharge plateau of 1.6–1.8 V is among the highest in reported aqueous Al ion batteries,together with a high discharge specific capacity of~140 mAh g^(-1).However,due to the water electrolysis side reaction,the faradaic efficiency can only reach 85%with a cycle life of 250 due to the dry out of *** from using flexible materials and aqueous electrolyte,this paper-based Al ion battery can tolerate various deformations such as bending,rolling and even puncturing without losing its *** two single cells are connected in series,the battery pack can provide a charge voltage of 4.3 V and a discharge plateau as high as 3–3.6 V,which are very close to commercial Li ion *** a cheap,flexible and safe battery technology may be widely applied in low-cost and large-quantity applications,such as RFID tags,smart packages and wearable biosensors in the future.

关键词： Al ion battery Aqueous electrolyte Water-in-salt Paper battery Flexible battery

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Experimental study on geosynthetic-reinforced sand fill over marine clay with or without deep cement mixed soil columns under different loadings

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Underground Space 2019年第4期4卷 340-347页

作者： Pei-Chen Wu Jian-Hua Yin Wei-Qiang Feng Wen-Bo Chen Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina

Geosynthetics and deep cement mixed(DCM)soil columns have been widely used to improve soft soil grounds in many countries and *** paper presents an experimental study on a geosynthetic-reinforced sand fill over marine clay with or without DCM columns under different *** tests were conducted on the sand fill reinforced with fixed-end and free-end geosynthetics over marine clay under three-stage local loading to investigate the effects of the boundary conditions of geosynthetic reinforcement on reducing *** is observed that the fixed-end geosynthetic sheet is more effective in reducing settlements than the free-end condition under identical local *** test was conducted on the fixed-end geosynthetic-reinforced sand fill over the marine clay improved by DCM columns under single-stage uniform *** vertical stresses on the marine clay and on the DCM columns,as well as the tensile strains of the geosynthetic sheet in the overlying sand fill,were *** results revealed that the stress concentration ratio increases with an increase in consolidation settlements,and the maximum tensile strain of the geosynthetic sheet occurs near the edge rather than at the center of the top surface of the DCM columns.

关键词： Settlement Geosynthetic Reinforcement Deep cement mixed soil columns

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In situ printing of liquid superlenses for subdiffraction-limited color imaging of nanobiostructures in nature

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Microsystems & Nanoengineering 2019年第1期5卷 695-707页

作者： Boliang Jia Feifei Wang Hoyin Chan Guanglie Zhang Wen Jung Li Department of Mechanical Engineering City University of Hong KongHong KongHong Kong S.A.R.China Shenzhen Academy of Robotics Shenzhen 518000China Department of Chemistry Stanford UniversityStanfordCA 94305USA

The nanostructures and patterns that exist in nature have inspired researchers to develop revolutionary components for use in modern technologies and our daily *** nanoscale imaging of biological samples with sophisticated analytical tools,such as scanning electron microscopy(SEM)and transmission electron microscopy(TEM),has afforded a precise understanding of structures and has helped reveal the mechanisms contributing to the behaviors of the samples but has done so with the loss of photonic ***,we present a new method for printing biocompatible“superlenses”directly on biological objects to observe subdiffraction-limited features under an optical microscope in *** demonstrate the nanoscale imaging of butterfly wing scales with a super-resolution and larger field-of-view(FOV)than those of previous dielectric microsphere *** approach creates a fast and flexible path for the direct color observation of nanoscale biological features in the visible range and enables potential optical measurements at the subdiffraction-limited scale.

关键词： printing structures diffraction

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