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Systematic engineering of BiVO_(4)photoanode for efficient photoelectrochemical water oxidation

Carbon Energy 2024年第4期6卷 12-21页

作者： Zhiting Liang Meng Li kai‐hang ye Tongxin Tang Zhan Lin Yuying Zheng Yongchao Huang Hongbing Ji Shanqing Zhang Guangzhou Key Laboratory of Clean Transportation Energy Chemistry School of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhouChina Chemical Engineering Guangdong Laboratory Jieyang Branch of ChemistryJieyangChina Key Laboratory for Water Quality and Conservation of the Pearl River Delta Institute of Environmental Research at Greater Bay AreaMinistry of EducationGuangzhou UniversityGuangzhouChina State Key Laboratory Breeding Base of Green‐Chemical Synthesis Technology Institute of Green Petroleum Processing and Light Hydrocarbon ConversionCollege of Chemical EngineeringZhejiang University of TechnologyHangzhouChina School of Environment and Science Centre for Catalysis and Clean EnergyGriffith UniversityGold Coast CampusSouthportQueenslandAustralia

BiVO_(4)is one of the most promising photoanode materials for photoelectrochemical(PEC)solar energy conversion,but it still suffers from poor photocurrent density due to insufficient light‐harvesting efficiency(LHE),weak photogenerated charge separation efficiency(Φ_(Sep)),and low water oxidation efficiency(Φ_(OX)).Herein,we tackle these challenges of the BiVO_(4)photoanodes using systematic engineering,including catalysis engineering,bandgap engineering,and morphology *** particular,we deposit a NiCoO_(x)layer onto the BiVO_(4)photoanode as the oxygen evolution catalyst to enhance theΦ_(OX)of Fe‐g‐C_(3)N_(4)/BiVO_(4)for PEC water oxidation,and incorporate Fe‐doped graphite‐phase C_(3)N_(4)(Fe‐g‐C_(3)N_(4))into the BiVO_(4)photoanode to optimize the bandgap and surface areas to subsequently expand the light absorption range of the photoanode from 530 to 690 nm,increase the LHE andΦ_(Sep),and further improve the oxygen evolution reaction activity of the NiCoO_(x)catalytic ***,the maximum photocurrent density of the as‐prepared NiCoO_(x)/Fe‐g‐C_(3)N_(4)/BiVO_(4)is remarkably boosted from 4.6 to 7.4 mA cm^(−2).This work suggests that the proposed systematic engineering strategy is exceptionally promising for improving LHE,Φ_(Sep),andΦ_(OX)of BiVO_(4)‐based photoanodes,which will substantially benefit the design,preparation,and large‐scale application of next‐generation high‐performance photoanodes.

关键词： bismuth vanadate carbon nitride charge separation heterojunction water oxidation

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A novel CoOOH/(Ti, C)-Fe_2O_3 nanorod photoanode for photoelectrochemical water splitting

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Science China Materials 2018年第6期61卷 887-894页

作者： kai-hang ye1 3 Zilong Wang1 Haibo Li3 Yufei Yuan1 Yongchao Huang2 Wenjie Mai Siyuan Laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Fine Chemical Industry Research Institute School of Chemical Engineering and Technology Sun Yat-sen University Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of Education School of Environmental Science and Engineering Guangzhou University

In this work, we demonstrate the CoOOH/（Ti,C）-Fe2O3（CTCF） nanorods prepared by a facile approach as well as their implementation as photoanodes for photoelectrochemical（PEC） water splitting. The photocurrent density of CTCF photoanode is 1.85 m A cm-2 at ＋1.23 V vs. reversible hydrogen electrode（RHE）, which is more than 20 times higher than that of pristine α-Fe2O3 photoanode（0.08 m A cm-2）. The incident-photo-to-current conversion efficiency, applied bias photo-to-current efficiency and transfer efficiency of CTCF photoanode reaches 31.2% at 380 nm（＋1.23 V vs. RHE）,0.11%（＋1.11 V vs. RHE）, 68.2%（＋1.23 V vs. RHE） respectively, which are much higher than those of pristine α-Fe2O3 photoanode. Additionally, the longtime irradiation PEC water splitting of CTCF photoanode demonstrates its high stability at extreme voltage in NaOH（pH 14）.

关键词： photoelectrochemistry water splitting doping ferric oxide

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钒酸铋光电催化分解水的研究进展

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科学通报 2022年第19期67卷 2115-2125页

作者：叶凯航汤桐鑫梁志庭纪红兵林展杨世和广东工业大学轻工化工学院广州市清洁交通能源化学重点实验室广州510006 北京大学深圳研究生院化学生物学与生物技术学院广东省纳米微米材料研究重点实验室深圳518055 中山大学化学学院精细化工研究院广州510275

光电化学(photoelectrochemical,PEC)催化分解水制氢被认为是生态友好、规模化和可持续性地转化与储存太阳能的理想途径之一,但光阳极较低的工作效率限制了PEC分解水的发展.近年来,钒酸铋光阳极因具有较高的理论光电流密度受到科学界的... 详细信息

光电化学(photoelectrochemical,PEC)催化分解水制氢被认为是生态友好、规模化和可持续性地转化与储存太阳能的理想途径之一,但光阳极较低的工作效率限制了PEC分解水的发展.近年来,钒酸铋光阳极因具有较高的理论光电流密度受到科学界的广泛关注.大量的工作聚焦在如何将钒酸铋光阳极所具有的理论潜力尽可能地发挥并应用至PEC分解水制氢.本文通过回顾和分析钒酸铋光阳极的吸光效率、光生载流子分离效率与表面催化产氧效率3个方面的研究进展,对高性能钒酸铋光阳极的设计思路与合成方法进行评述、总结与展望,为进一步挖掘钒酸铋光电极的潜力与开发下一代光电极提供参考和思路.

关键词：光电催化分解水钒酸铋光阳极

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High accuracy in automatic detection of atrial fibrillation for Holter monitoring

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第9期13卷 751-756页

作者： kai JIANG Chao HUANG Shu-ming ye hang CHEN Key Laboratory of Biomedical Engineering of Education Ministry Zhejiang UniversityHangzhou 310058China

Atrial fibrillation(AF) has been considered as a growing epidemiological problem in the world,with a substantial impact on morbidity and *** electrocardiography(e.g.,Holter) monitoring is commonly used for AF diagnosis and therapy and the automated detection of AF is of great significance due to the vast amount of information *** study presents a combined method to achieve high accuracy in AF ***,we detected the suspected transitions between AF and sinus rhythm using the delta RR interval distribution difference curve,which were then classified by a combination analysis of P wave and RR *** MIT-BIH AF database was used for algorithm validation and a high sensitivity and a high specificity(98.2% and 97.5%,respectively) were ***,we developed a dataset of 24-h paroxysmal AF Holter recordings(n=45) to evaluate the performance in clinical practice,which yielded satisfactory accuracy(sensitivity=96.3%,specificity=96.8%).

关键词： Atrial fibrillation Delta RR interval distribution difference curve Holter monitoring

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Nonlinear dynamics and manipulation of dripping in capillary flow focusing

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Science China(Physics,Mechanics & Astronomy) 2019年第12期62卷 78-88页

作者： kai Mu Ting Si hang Ding Department of Modern Mechanics University of Science and Technology of China

In this study, we carried out experimental and numerical investigations on the dripping dynamics in axisymmetric capillary flow focusing. For the direct numerical simulations, we solved the Navier-Stokes equations coupled with a diffuse interface *** the experiments, we observed both periodic and non-periodic dripping modes at different focused and focusing liquid flow rates. The non-periodic dripping that results in polydispersed droplets downstream the orifice can be attributed to the nonlinear dynamics of the flow;thus, we constructed numerical plots of the streamlines and temporal evolutions of the focused liquid cone in different modes. We identified a phase diagram of the dripping regimes in the plane of mainly dimensionless parameters, which led us to further investigate the effects of liquid physical properties, such as viscosity and interface tension, on the mode *** suppression of the nonlinear dynamics, we proposed a geometrical optimization that imports a guiding rod positioning along the axis of the capillary tube. Here, we conducted a numerical analysis on the manipulation of the dripping process, as well as scaling analysis on the appearance of the nonlinear dripping. We expect this study to provide an insight into the underlying physical mechanisms of dripping in flow focusing, which are advantageous in the generation of monodispersed microdroplets for various applications.

关键词： flow focusing microdroplet dripping nonlinear dynamics

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Simulation of incompressible multiphase flows with complex geometry using etching multiblock method

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Applied Mathematics and Mechanics(English Edition) 2016年第11期37卷 1405-1418页

作者： Haoran LIU kai MU hang DING Department of Modern Mechanics University of Science and Technology of China

The incompressible two-phase flows are simulated using combination of an etching multiblock method and a diffuse interface （DI） model, particularly in the com- plex domain that can be decomposed into multiple rectangular subdomains. The etching multiblock method allows natural communications between the connected subdomains and the efficient parallel computation. The DI model can consider two-phase flows with a large density ratio, and simulate the flows with the moving contact line （MCL） when a geometric formulation of the MCL model is included. Therefore, combination of the etch- ing method and the DI model has potential to deal with a variety of two-phase flows in industrial applications. The performance is examined through a series of numerical exper- iments. The convergence of the etching method is firstly tested by simulating single-phase flows past a square cylinder, and the method for the multiphase flow simulation is vali- dated by investing drops dripping from a pore. The numerical results are compared with either those from other researchers or experimental data. Good agreement is achieved. The method is also used to investigate the impact of a droplet on a grooved substrate and droplet generation in flow focusing devices.

关键词： etching multiblock method complex geometry multiphase flow movingcontact line (MCL) multiblock

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A Highly Sensitive In-Situ Turbidity Sensor With Low Power Consumption

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Photonic Sensors 2014年第1期4卷 77-85页

作者： Yi Hu Lei Sun Shuming ye hang Chen kai Jiang Jianming Pan College of Biomedical Engineering&Instrumentation Science in Zhejiang University Hangzhou310027China Key lab of Biomedical Engineering of Ministry of Education in Zhejiang University Hangzhou310027China Laboratory of Marine Ecosystem and Biogeochemistry State Oceanic Administration(SOA)Hangzhou310012China

A highly sensitive in-situ turbidity sensor with the low power consumption was proposed and evaluated in this study. To meet the practical requirements of the in-situ detection, we have designed the light scattering path, watertight mechanical structure, and ultra-weak scattering light detecting method. Experiments showed that the sensor had a sensitivity of 0.0076 FTU with the concentration range of 0 - 25 FTU and the R-square of 0.9999. The sensor could withstand the water pressure in depth of 1000m and had the low power consumption in the active mode 10.4mA, sleep mode 65 pA with a supply voltage of 8.4V. Southern China Sea buoy experiments indicated that the sensor could work well in the actual in-situ environment. In comparison with sensors of other companies, our sensor had relatively more comprehensive performance.

关键词： In-situ turbidity sensor high sensitivity low power consumption water tight mechanical structure

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Ultra-stable and color-tunable manganese ions doped lead-free cesium zinc halides nanocrystals in glasses for light-emitting applications

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Nano Research 2022年第10期15卷 9368-9376页

作者： kai Li Ying ye Wenchao Zhang Yao Zhou Yudong Zhang Shisheng Lin hang Lin Jian Ruan Chao Liu State Key Laboratory of Silicate Materials for Architectures(SMART) Wuhan University of Technology122 Luoshi RoadHongshanWuhan 430070China CAS Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China

All inorganic CsPbX_(3)(X=Cl,Br,and I)perovskite nanocrystals have made unprecedented radical progresses for opto-electronic applications,but their instability and toxicity of lead impede their wide ***,we report the first precipitation of leadfree Mn:Cs_(2)ZnX_(4) nanocrystals in *** green and red photoluminescence are realized from these Mn:Cs_(2)ZnX_(4 )nanocrystals in *** adjusting the size and halide component in these nanocrystals,coordination environment of Mn^(2+)ions can be tuned,leading to tunable photoluminescence with improved quantum *** is illustrated that in-situ precipitation of these Mn:Cs_(2)ZnX_(4) nanocrystals in glasses significantly improves their thermal-,chemical-,and photo-stabilities,making them promising for light-emitting diodes with stable chromaticity coordinates.

关键词： cesium zinc halides nanocrystals lead-free long-term-stability light-emitting diode(LED)

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Reaction network design and hybrid modeling of S Zorb

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Chinese Journal of Chemical Engineering 2024年第9期73卷 301-310页

作者： kai Ji Zhencheng ye Feng Qian Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of EducationEast China University of Science and TechnologyShanghai 200237China Qingyuan Innovation Laboratory Quanzhou 362801China

At present,many countries are becoming more and more stringent in terms of sulfur content in fuel oil.S Zorb is a kind of desulfurization technology with advantages of exceptional desulfurization efficiency and small impact on octane *** meet the needs of environmental requirements and the trend of digitalization in the petrochemical industry,a first-principle model of S Zorb was established based on industry *** order to describe the desulfurization and the other side reactions,a reaction network was designed and the kinetic parameters were estimated by the particle swarm optimization *** hybrid models based on the first-principle model and support vector regression method were established to correct the mass fraction of sulfur and predict the research octane number of the refined gasoline *** results indicate that the hybrid models can predict the mass fraction of PIONA,sulfur content and research octane number of the refined gasoline accurately,of which the mean absolute percentage errors are less than 6%.Hybrid models were then applied to optimize the decision variables to minimize the research octane number *** results show that the average reduction of the loss of research octane number is 21.8%,which suggests that the models developed hold promise for guiding practical production.

关键词： Desulfurization Simulation Reaction kinetics Optimization

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Hybrid Precoding for Cluster-Based Multi-Carrier Beam Division Multiple Access in Terahertz Wireless Communications

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China Communications 2021年第5期18卷 81-92页

作者： hang Yuan Xiang Wang kai Yang Jianping An School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China National Innovation Institute of Defense Technology Chinese Academy of Military ScienceBeijing 100000China

Terahertz(THz)wireless communication has the capability to connect massive devices using its ultra-large spectrum *** propose a hybrid precoding scheme for the cluster-based multi-carrier beam division multiple access(MC-BDMA)to enable THz massive *** the inter-beam interference and inter-band power leakage in this system are considered.A mathematical model is established to analyze and reduce their effects on the THz signal *** considering the peculiarities of THz channels and characteristics of THz hardware components,we further propose a three-step hybrid precoding algorithm with low complexity,where the received signal power enhancement,the inter-beam interference elimination,and the inter-band power leakage suppression are conducted in *** results are presented to demonstrate the high spectrum efficiency and high energy efficiency of our proposed algorithm,especially in the massive-connection scenarios.

关键词： terahertz wireless communications multicarrier hybrid precoding power leakage suppression

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