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Ligand engineering of colloid quantum dots and their application in all-inorganic tandem solar cells

Journal of Energy Chemistry 2020年第11期29卷 230-239页

作者： Fen Qiao Yi Xie Zhankun Weng huaqiang chu School of Energy&Power Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070HubeiChina Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing Changchun University of Science and TechnologyChangchun 130022JilinChina International Research Centre for Nano Handling and Manufacturing of China Changchun University of Science and TechnologyChangchun 130022JilinChina School of Energy and Environment Anhui University of Technology.Ma'an-shan 243002.AnhuiChina

How to effectively utilize the energy of the broad spectrum of sunlight is one of the basic problems in the research of tandem solar cells. Due to their size effect, quantum confinement effect and coupling effect, colloidal quantum dots(QDs) exhibit new physical properties that bulk materials don’t ***(X = Se, S, etc.) and Pb X(X = Se, S, etc.) QDs prepared by hot-injection methods have been widely studied in the areas of photovolitaic devices. However, the surfactants surrounding QDs seriously hinder the charge transport of QDs based solar cells. Therefore, how to fabricate high-performance tandem solar cells via ligands engineering has become a major challenge. In this paper, the latest progress of colloidal QDs in the research of all-inorganic tandem solar cells was summarized. Firstly, the improvement of QDs surface ligands and the optimization of ligands engineering were discussed, and the control of the physical properties of QDs films were realized. From the aspects of colloidal QDs, ligand engineering, and solar cell preparation, the future development direction of colloidal QDs solar cells was proposed, providing technical guidances for the preparation of low-cost and high-efficiency nanocrystalline solar cells.

关键词： Hot-injection method Colloidal quantum dots Ligand engineering Tandem solar cell

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Dynamic Analysis of Bubble Attachment and Sweeping on Microwire in Subcooled Nucleate Pool Boiling

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Journal of Thermal Science 2021年第5期30卷 1842-1858页

作者： XU Nian JIANG Hantao PENG Licheng WANG Dongdong chu huaqiang School of Energy and Environment Anhui University of TechnologyMa'anshan 243002China College of Ecology and Environment Hainan UniversityHaikou 570228China Engineering Technology Research Center of Energy Saving&Pollutant Control in Metallurgical Process Anhui University of TechnologyMa'anshan 243002China

With the development of industrial technology,heat transfer at the microscale has attracted more and more *** this work,200μm platinum wire and 150μm nickel-chromium wire were used as experimental objects,which the power was provided by DC power with the range of 15.6 W to 56.2 *** water was used as the experimental *** bubbles on the micro wire were observed and the heat mechanism was analyzed.A variety of bubble attachment phenomena were captured on the 200μm platinum wire,including the adhesion during bubble detachment,the rotation of small attached bubbles on the surface of large bubble,multiple bubbles circling at the top of the same bubble,and different attached bubble departure *** force in the vertical direction triggered the formation of bubble *** addition,the effects of surface tension,adhesion force and buoyancy force on the circling of the bubble were also *** analysis of the bubble sweeping on the 150μm nickel-chromium wire was *** results showed that the static bubble would interact with the sweeping bubbles on the other side,thereby changing the heat transfer mechanism,which was not discussed in detail *** bubble jet flow generated by thermocapillary convection on the vertical direction of the bubble surface was the main influencing factor,which would change the microlayer encountered in front of the *** effects of bubble diameter and liquid subcooling on the sweeping velocity were also *** results showed that the larger the bubble diameter was,the lower the sweeping velocity would be achieved while the liquid subcooling temperature had less impact on the velocity of sweeping bubble.

关键词： nucleate boiling attachment sweeping Marangoni force

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A review of CFD simulation in pressure driven membrane with fouling model and anti-fouling strategy

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 1-29页

作者： Shiyong Miao Jiaying Ma Xuefei Zhou Yalei Zhang huaqiang chu State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Tongji UniversityShanghai 200092China

Pressure-driven membrane filtration systems are widely utilized in wastewater treatment,desalination,and water reclamation and have received extensive attention from *** fluid dynamics(CFD)offers a convenient approach for conducting mechanistic studies of flow and mass transfer characteristics in pressure-driven *** a signature phenomenon in membrane systems,the concentration polarization that accompanies the permeation process is a key factor in membrane performance degradation and membrane fouling *** fouling models(scaling,biofouling and colloidal particle fouling)based on CFD theory have been constructed,and considerable research has been *** representative antifouling strategies with special simulation methods,including patterned membranes,vibration membranes,rotation membranes,and pulsatile flows,have also been *** studies should focus on refining fouling models while considering local hydrodynamic characteristics;experimental observation tools focusing on the internal structure of inhomogeneous fouling layers;techno-economic model of antifouling strategies such as vibrational,rotational and pulsatile flows;and unfavorable hydraulic phenomena induced by rapidly changing flows in simulations.

关键词： Computational fluid dynamics Membrane Fouling model Concentration polarization

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Numerical Investigation of Heat Transfer Characteristics of Supercritical CO_2 Tube in Combustion Chamber of Coal-Fired Boiler

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Journal of Thermal Science 2019年第3期28卷 442-453页

作者： WANG Jimin CHEN Xue ZHANG Chao GU Mingyan chu huaqiang School of Energy and Environment Anhui University of Technology

To achieve compact structure, light weight, and high thermal efficiency for the coal-fired boiler, the supercritical CO_2 power cycle has been considered as one of the promising alternatives in the coal-fired power conversion system. One of the major problems concerning fossil fuel powered plants is the safety of the water wall in boiler design. In this work, the heat transfer characteristics of the supercritical CO_2 tube in the combustion chamber were determined through the low Reynolds number k-ε model, the gas real model and the P-1 radiation model. The study covered the supercritical CO_2 tube and the fins, and the annulus flue gas passage was also included. The wall temperature and the heat transfer coefficient were compared against those obtained from the experiments. Based on the examinations of the calculated flow and turbulence fields, the distributions of the velocity and the temperature inside the supercritical CO_2 tube in the combustion chamber were resolved numerically. Moreover, the effects of the heat transfer coefficient on the heat transfer characteristics were also discussed. And it was numerically focused on the influence of the inclined angle on the flow and the heat transfer of the supercritical CO_2 tube. The results show that the heat transfer coefficient keeps namely constant as the increasing inclined angle. It would help to better understand the heat transfer mechanism of unique characteristics of supercritical CO_2 above the pseudo-critical temperature, which may provide the corresponding theoretical basis on the optimization design of the coal-fired boiler.

关键词： supercritical CO2 numerical simulation combustion chamber heat transfer characteristics inclined angle

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Effect of CO_(2) dilution on laminar burning velocities,combustion characteristics and NO_(x) emissions of CH_(4)/air mixtures

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International Journal of Coal Science & Technology 2023年第5期10卷 119-136页

作者： Wenlong Dong Longkai Xiang Jian Gao Bingbing Qiu huaqiang chu School of Energy and Environment Anhui University of TechnologyMa'anshan 243002People's Republic of China Key Laboratory for Power Machinery and Engineering of Ministry of Education(MOE) Shanghai Jiao Tong UniversityShanghai 200240People's Republic of China

The laminar combustion characteristics of CH_(4)/air premixed flames with CO_(2) addition are systemically *** measurements and numerical simulations of the laminar burning velocity(LBV)are performed in CH_(4)/CO_(2)/Air flames with various CO_(2) doping ratio under equivalence ratios of 1.0–*** 3.0 mech and Aramco mech are employed for predicting LBV,adiabatic flame temperature(AFT),important intermediate radicals(CH_(3),H,OH,O)and NO_(x) emissions(NO,NO_(2),N2O),as well as the sensitivity analysis is also *** detail analysis of experiment and simulation reveals that as the CO_(2) addition increases from 0%to 40%,the LBVs and AFTs decrease *** the same CO_(2) doping ratio,the LBVs and AFTs increase first and then decrease with the increase of equivalence ratio,and the maximum of LBV is reached at equivalence ratio of *** mole fraction tendency of important intermediates and NO_(x) with equivalence ratio and CO_(2) doping ratio are similar to the LBVs and *** H+O_(2)⇔O+OH is found to be responsible for the promotion of the generation of important intermediates and NO_(x) under the equivalence ratios and CO_(2) addition through sensitivity *** sensitivity coefficients of elementary reactions that the increasing of CO_(2) doping ratio promotes or inhibits formation of intermediate radicals and NO_(x) decreases.

关键词： CO_(2)dilution Laminar burning velocity Adiabatic flame temperature Sensitivity analysis

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Molecular dynamics study of water molecules nucleation for fine particle removal:Effects of wettability and aggregation modes and comparison with experiment Author links open overlay panel

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Particuology 2024年第8期91卷 106-117页

作者： Junchao Xu Zhipeng Zhang Li Lv Yunfei Zhang Yiming Xie huaqiang chu School of Energy and Environment Anhui University of TechnologyMaanshan243002China College of Mechanical and Electrical Engineering China Jiliang UniversityHangzhou310018China

Water vapor nucleation on particle's surface plays an important role in dust removal,cloud formation,and particle ***,the selectivity of nucleation sites and the nucleation characteristic of water molecule on the particle's surface are still unclear,especially for the aggregated *** this paper,the effects of particle wettability and aggregation modes on the selectivity of nucleation sites and the nucleation characteristics were investigated using molecular dynamics *** results were compared with our earlier experimental *** illustrates how the contact angle of clusters,the growth velocity,and the growth duration are all influenced by the interaction coefficient between water and ***,the nucleation sites of water molecules on the particle aggregation surface exhibit a definite *** primary indicator of this selectivity is the preferential nucleation of water molecules at the interfaces of linear chain aggregation particles,at the inner side of non-linear chain aggregation particles,and at the centers of ring *** results are in good agreement with our previous experimental *** significantly,additional research has revealed that subcritical-size clusters typically aggregate on two-particle surfaces spacing when the spacing smaller than the critical cluster size.

关键词： Heterogeneous nucleation Water molecule Wettability Aggregation modes Molecule dynamics

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Evaluation of humic acid removal by a flat submerged membrane photoreactor

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Chinese Science Bulletin 2011年第32期56卷 3437-3444页

作者： WEI Yong chu huaqiang DONG BingZhi LI Xuan School of Environmental Science and Engineering State Key Laboratory of PoUution Control and Resource Reuse Tongji University Shanghai200092 China School of Environmental and Safety Engineering Changzhou University Changzhou 213164 China

A flat submerged membrane combined with a TiO 2 /UV photocatalytic reactor (FSMPR) was employed in batch mode to remove humic acid (HA). HA removal efficiency was characterized by UV 254 absorbance, UV-vis spectra, dissolved organic carbon (DOC) concentration, specific UV absorbance (SUVA), and trihalomethane formation potential (THMFP). The FSMPR process was effective in removing more than 86% of DOC and nearly 100% of UV 254 absorbance, while the THMFPs of samples were reduced to < 19 μ g/L after 150 min of treatment. In addition, changes in transmembrane pressure (TMP) with and without UV were evaluated; TiO 2 /UV was effective at controlling membrane fouling by HA. Analysis of the molecular weight (MW) distributions and three-dimensional excitation-emission matrix (EEM) fluorescence spectra of HAs revealed that the effectiveness in membrane fouling control is a result of changes in HA molecular characteristics. The TiO 2 /UV photocatalytic reactor caused the degradation of high MW, hydrophobic humic-like molecules to low MW, hydrophilic protein-like molecules, although this fraction was not completely removed during 150 min of treatment and was less responsible for membrane fouling.

关键词：光催化反应器腐殖酸类跨膜评价浸没式膜污染控制光催化氧化 UV254

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Effect of heat and bubble mass transfer on the efficiency of alkaline electrolysis hydrogen production

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Nano Research 2024年第11期17卷 9345-9370页

作者： Nian Xu Bingbing Qiu Zucun Rui Tianxiang Ji Zilong Liu huaqiang chu School of Energy and Environment Anhui University of Technology Ma’anshan 243002 China SOJO Electric Hefei Co. Ltd. Hefei 231121 China

This review highlights the critical effects of heat transfer and bubble mass transfer in alkaline water electrolysis on hydrogen generation efficiency. To improve heat transfer performance, the study focuses on reducing electrical resistance and controlling the electrolysis system’s temperature. It proposes innovative strategies such as using metal matrix composites and catalysts to optimize electrode structure, precise temperature and pressure regulation and enhanced electrolyte concentration. Additionally, the study examines the dynamics of bubble mass transfer, proposing effective strategies to reduce bubble coverage, including hydrophilic electrodes, mechanically circulating the electrolyte and voltage smoothing with pressure swinging. This study contributes to the advancement of hydrogen energy technology with practical strategies. By adjusting the electrolysis system to optimize the combined effect of these factors, we can improve the efficiency, economy and environmental friendliness of hydrogen production. This will contribute to the transformation of the global energy mix and the implementation of sustainable development strategies.

关键词： hydrogen resistance bubble coverage heat transfer mass transfer

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Technologies for pollutant removal and resource recovery from blackwater:a review

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Frontiers of Environmental Science & Engineering 2023年第7期17卷 57-77页

作者： Wei Zhang huaqiang chu Libin Yang Xiaogang You Zhenjiang Yu Yalei Zhang Xuefei Zhou State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China

Blackwater(BW),consisting of feces,urine,flushing water and toilet paper,makes up an important portion of domestic *** improper disposal of BW may lead to environmental pollution and disease transmission,threatening the sustainabie development of the *** in nutrients and organic matter,BW could be treated for resource recovery and reuse through various *** at providing guidance for the future development of BW treatment and resource recovery,this paper presented a literature review of BWs produced in different countries and types of toilets,including their physiochemical characteristics,and current treatment and resource recovery *** degradation and utilization of carbon(C),nitrogen(N)and phosphorus(P)within BW are *** performance of different systems was classified and *** all the treating systems,biological and ecological systems have been long and widely applied for BW treatment,showing their universality and operability in nutrients and energy recovery,but they are either slow or ineffective in removal of some refractory *** processes,especially advanced oxidation processes(AOPs),are becoming increasingly extensively studied in BW treatment because of their high efficiency,especially for the removal of micropollutants and *** review could serve as an instructive guidance for the design and optimization of BW treatment technologies,aiming to help in the fulfilment of sustainable human excreta management.

关键词： Blackwater Water-flushing toilet Sanitation Nutrientrecovery Waterreuse Sustainable development

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Carbamazepine degradation by heterogeneous activation of peroxymonosulfate with lanthanum cobaltite perovskite:Performance,mechanism and toxicity

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Journal of Environmental Sciences 2020年第5期32卷 10-21页

作者： Huichao Guo Xuefei Zhou Yalei Zhang Qiufang Yao Yajie Qian huaqiang chu Jiabin Chen State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Key Laboratory of Yangtze River Water Environment for Ministry of Education College of Environmental Science and EngineeringTongji UniversityShanghai 200092China College of Environmental Science and Engineering Donghua UniversityShanghai 201620China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

The widely used carbamazepine(CBZ)is one of the most persistent pharmaceuticals and suffers insufficient removal efficiency by conventional wastewater treatment.A synthesized Co-based perovskite(LaCoO3)was used to activate peroxymonosulfate(PMS)in order to degrade *** showed that LaCoO3 exhibited an excellent performance in PMS activation and CBZ degradation at neutral pH,with low cobalt *** results of FT-IR and XPS verified the high structurally and chemically stability of LaCoO3 in PMS *** spin resonance(ESR)analysis suggested the generation of radical species,such as sulfate radicals(SO4·-)and hydroxyl radicals(·OH).Radical quenching experiments further revealed the responsibility of SO4·-as the dominant oxidant for CBZ *** products were detected via the oxidation of CBZ,with the olefinic double bond attacked by SO4·-as the initial ***,hydrolysis,cyclization and dehydration were involved along the transformation of *** toxicity of CBZ solution was significantly reduced after treating by PMS/LaCoO3.

关键词： Perovskite Carbamazepine(CBZ) Peroxymonosulfate(PMS) Transformation product Toxicity

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