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Experimental Study on the Hydrodynamic Performance of a Heaving Buoy Assembled on a Net Cage Platform

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Journal of Ocean University of China 2019年第5期18卷 1031-1040页

作者： SHI Hongda dong xiaochen FENG Liang HAN Zhi Shandong Provincial Key Laboratory of Ocean Engineering Ocean University of ChinaQingdao 266100China Department of Ocean Engineering College of EngineeringOcean University of ChinaQingdao 266100China Qingdao Municipal Key Laboratory of Ocean Renewable Energy Ocean University of ChinaQingdao 266100China

To take advantage of the abundance of both fishery and wave energy resources in offshore sea areas,a novel floating platform with a heaving buoy-based wave energy converter(WEC)assembled with a set of net cages is presented in this *** floating WEC system provides a power supply,while the net cages are used for *** is designed to have an independent and self-operation breeding *** experimental study is carried out to investigate the hydrodynamic performance of the device in a wave tank considering the factors of net cages,draft depth,and power take-off,and results show that these variables have significant effects on wave energy *** waves with short periods cause intense interactions that allow the device to undergo large relative *** draft depth could be determined according to wave period rather than wave *** study also explores the response amplitude operator of the device and determines its resonance *** experimental results could provide reliable information for future studies on phase differences and the design of two-body WECs.

关键词： heaving buoy floating platform hydrodynamic performance experimental study

Pyrolysis mechanism of glucose and mannose: The formation of 5-hydroxymethyl furfural and furfural

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Journal of Energy Chemistry 2018年第2期27卷 486-501页

作者： Bin Hu Qiang Lu Xiaoyan Jiang xiaochen dong Minshu Cui Changqing dong Yongping Yang National Engineering Laboratory for Biomass Power Generation Equipment North China Electric Power University

Fast pyrolysis of biomass will produce various furan derivatives, among which 5-hydroxymethyl furfural（5-HMF） and furfural（FF） are usually the two most important compounds derived from holocellulose. In this study, density functional theory（DFT） calculations are utilized to reveal the formation mechanisms and pathways of 5-HMF and FF from two hexose units of holocellulose, i.e., glucose and mannose. In addition, fast pyrolysis experiments of glucose and mannose are conducted to substantiate the computational results, and the orientation of 5-HMF and FF is determined by 13C-labeled glucoses. Experimental results indicate that C1 provides the aldehyde group in both 5-HMF and FF, and FF is mainly derived from C1 to C5 segment. According to the computational results, glucose and mannose have similar reaction pathways to form 5-HMF and FF with d-fructose（DF） and 3-deoxy-glucosone（3-DG） as the key intermediates. 5-HMF and FF are formed via competing pathways. The formation of 5-HMF is more competitive than that of FF, leading to higher yield of 5-HMF than FF from both hexoses. In addition, compared with glucose,mannose can form 5-HMF and FF via extra pathways because of the epimerization at C2 position. Therefore, mannose pyrolysis results in higher yields of 5-HMF and FF than glucose pyrolysis.

关键词： Pyrolysis mechanism 5-HMF FF Density functional theory ^13C isotope labeling

Controllable synthesis of triangular Ni（HCO3）2 nanosheets for supercapacitor

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Nano Research 2016年第5期9卷 1358-1365页

作者： Xiaoxian Zang Ziyang Dai Jing Guo Qiuchun dong Jun Yang Wei Huang xiaochen dong Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) Nanjing 211816 China

Triangular Ni（HCO3）2 nanosheets were synthesized via a template-free solvothermal method. The phase transition and formation mechanism were explored systematically. Further investigation indicated that the reaction time and pH have significant effects on the morphology and size distribution of the triangular Ni（HCO3）2 nanosheets. More interestingly, the resulting product had an ultra-thin structure and high specific surface area, which can effectively accelerate the charge transport during charge--discharge processes. As a result, the triangular Ni（HCO3）2 nanosheets not only exhibited high specific capacitance （1,797 F·g^-1 at 5 A·g^-1 and 1,060 F·g^-1 at 50 A·g^-1）, but also showed excellent cycling stability with a high current density （-80% capacitance retention after 5,000 cycles at the current density of 20 A·g^-1）.

关键词： nickel bicarbonate nanosheets anodes supercapacitor

Simulation of the Power Take-off System for a Heaving Buoy Wave Energy Converter

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Journal of Ocean University of China 2020年第3期19卷 497-504页

作者： CAO Feifei SHI Hongda LI Ming dong xiaochen LI Demin College of Engineering Ocean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Ocean Engineering Qingdao 266100China Qingdao Municipal Key Laboratory of Ocean Renewable Energy Qingdao 266100China

The heaving buoy wave energy device is popular for wave conditions with small wave heights and short periods. This paper presents the design of a wave energy converter composed of a gyro buoy, a hydraulic power take-off, and an electricity generation system. The energy accumulators are used to improve the output power with different control strategies. The quantity relations between each component are established using theoretical methods. The simulation model describes the energy conversion and calculates the operation time, energy capacity, and output power of the device under different initial pressures, release pressures, and electric resistances. As a result, the capacity is determined by the electronic load, and the maximum output power can be obtained when the accumulators are turned on and off at the same time. This study investigates the factors influencing the electric energy production and can be used to guide the optimization of this type of device.

关键词： wave energy heaving buoy power-take-off accumulator output power

Metal-organic framework derived CoSe2 nanoparticles anchored on carbon fibers as bifunctional electrocatalysts for efficient overall water splitting

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Nano Research 2016年第8期9卷 2234-2243页

作者： Chencheng Sun Qiuchun dong Jun Yang Ziyang Dai Jianjian Lin Peng Chen Wei Huang xiaochen dong Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NanfingTech) 30 South Puzhu Road Nanjing 211816 China School of Chemical and Biomedical Engineering Nanyang Technological University 62 Nanyang Drive 637459 Singapore Singapore

The development of efficient, low-cost, for water splitting, particularly those stable, non-noble-metal electrocatalysts that can catalyze both the hydrogen evolution reaction （HER） at the cathode and oxygen evolution reaction （OER） at the anode, is a challenge. We have developed a facile method for synthesizing CoSe2 nanoparticles uniformly anchored on carbon fiber paper （CoSe2/CF） via pyrolysis and selenization of in situ grown zeolitic imidazolate framework-67 （ZIF-67）. CoSe2/CF shows high and stable catalytic activity in both the HER and OER in alkaline solution. At a low cell potential, i.e., 1.63 V, a water electrolyzer equipped with two CoSe2/CF electrodes gave a water-splitting current of 10 ***-2. At a current of 20 mA-cm-2, it can operate without degradation for 30 h. This study not only offers a cost-effective solution for water splitting but also provides a new strategy for developing various catalytic nanostructures by changing the metal-organic framework precursors.

关键词： metal-organic framework cobalt selenide electrocatalyst overall water splitting

Graphene as an intermediary for enhancing the electron transfer rate： A free-standing Ni3S2@graphene@CogSs electrocatalytic electrode for oxygen evolution reaction

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Nano Research 2018年第3期11卷 1389-1398页

作者： Qiuchun dong Yizhou Zhang Ziyang Dai Peng Wang Min Zhao Jinjun Shao Wei Huang xiaochen dong Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China

A highly active and stable oxygen evolution reaction （OER） electrocatalyst is critical for hydrogen production from water splitting. Herein, three-dimensional Ni3Sa@graphene@Co9S8 （Ni3S2@G@Co9S8）, a sandwich- structured OER electro-catalyst, was grown in situ on nickel foam; it afforded an enhanced catalytic performance when highly conductive graphene is introduced as an intermediary for enhancing the electron transfer rate and stability. Serving as a free-standing electrocatalytic electrode, Ni3S2@G@Co9S8 presents excellent electrocatalytic activities for OER： A low onset overpotential （2 mA·cm^-2 at 174 mV）, large anode current density （10 mA·cm^-2 at an overpotential of 210 mV）, low Tafel slope （66 mV·dec^-1）, and predominant durability of over 96 h （releasing a current density of N 14 mA·cm^-2 with a low and constant overpotential of 215 mV） in a 1 M KOH solution. This work provides a promising, cost-efficient electrocatalyst and sheds new light on improving the electrochemical performance of composites through enhancing the electron transfer rate and stability by introducing graphene as an intermediary.

关键词： three-dimensional graphene Ni3S2@G@Co9S8 oxygen evolution reaction

Metal oxyacid salts-confined pyrolysis towards hierarchical porous metal oxide@carbon(MO@C)composites as lithium-ion battery anodes

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Nano Research 2023年第5期16卷 6903-6913页

作者： Huizhong Xu Chang Gao Zhaoyang Cheng Linghui Kong Wei Li xiaochen dong Jianjian Lin Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science Ministry of Education(MOE)Shandong Key Laboratory of Biochemical AnalysisCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Engineering Research Center of High Performance Polymer and Molding Technology Ministry of EducationQingdao University of Science and TechnologyQingdao 266042China Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing211800China

Transition metal oxides(TMOs)have been thought of potential anodic materials for lithium-ion batteries(LIBs)owing to their intriguing ***,the limited conductivity and drastic volume change still hinder their practical ***,a metal oxyacid salts-confined pyrolysis strategy is proposed to construct hierarchical porous metal oxide@carbon(MO@C,MO=MoO_(2),V_(2)O_(5),WO_(3))composites for solving the aforementioned problems.A water-evaporation-induced self-assembly mechanism has been put forward for fabricating the MO@polyvinyl pyrrolidone(PVP)@SiO_(2)*** the following pyrolysis and etching process,small MO nanoparticles can be successfully encapsulated in the hierarchical porous carbon *** from the synergistic effect of MO nanoparticles and highly conductive carbon framework,MO@C composites show excellent electrochemical *** example,the as-obtained MoO_(2)@C composite exhibits a large discharge capacity(1513.7 mAh·g^(−1)at 0.1 A·g^(−1)),good rate ability(443.5 mAh·g^(−1)at 5.0 A·g^(−1)),supernal long-lived stability(669.1 mAh·g^(−1)after 1000 cycles at 1.0 A·g^(−1)).This work will inspire the design of novel anode materials for high-performance LIBs.

关键词： transition metal oxides hierarchical porous carbon framework anode materials lithium storage performance

Recent progress of flexible and wearable strain sensors for human-motion monitoring

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Journal of Semiconductors 2018年第1期39卷 175-195页

作者： Gang Ge Wei Huang Jinjun Shao xiaochen dong Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Material (IAM) Jiangsu National SynergeticInnovation Center for Advanced Material (SICAM) Nanjing Tech University (NanjingTech) School of Physical and Mathematical Science Nanjing Tech University (Nanjing Tech)

With the rapid development of human artificial intelligence and the inevitably expanding markets, the past two decades have witnessed an urgent demand for the flexible and wearable devices, especially the flexible strain sensors. Flexible strain sensors, incorporated the merits of stretchability, high sensitivity and skin-mountable,are emerging as an extremely charming domain in virtue of their promising applications in artificial intelligent realms, human-machine systems and health-care devices. In this review, we concentrate on the transduction mechanisms, building blocks of flexible physical sensors, subsequently property optimization in terms of device structures and sensing materials in the direction of practical applications. Perspectives on the existing challenges are also highlighted in the end.

关键词： wearable devices flexible sensors human-activity detection

Light-responsive organic artificial enzymes:Material designs and bio-applications

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Nano Research 2023年第1期16卷 117-126页

作者： Weili Wang Qing Shen Hao Cai Leichen Wang Jinjun Shao Wenjun Wang xiaochen dong Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211816China School of Physical Science and Information Technology Liaocheng UniversityLiaocheng 252059China

As significant biocatalysts,natural enzymes have exhibited a vast range of applications in biocatalytic ***,the“always-on”natural enzyme activity is not beneficial for the regulation of catalytic processes,which limits their ***,it has been extensively reported that various organic artificial enzymes exhibit prominent absorption and controlled activity under illumination,which not only creates a series of light-responsive catalytic platforms but also plays a key role in biosensing and biomedical *** provide novel ideas for the design of artificial enzymes,we conduct this review to highlight the recent progress of light-responsive organic artificial enzymes(LOA-Enz).The specific photoresponse mechanism and various bio-applications of LOA-Enz are also presented in ***,the remaining challenges and future perspectives in this field are discussed.

关键词： light-response organic artificial enzymes catalytic activity bio-applications