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Boosting alkaline hydrogen evolution performance by constructing ultrasmall ru clusters/Na^(+),K^(+)-decorated porous carbon composites

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Nano research 2023年第7期16卷 8836-8844页

作者： Mingxiu duan Tie Shu Jingwei Li daliang Zhang Li-Yong Gan Ke Xin Yao Qiang Yuan State-Local Joint Laboratory for Comprehensive Utilization of Biomass Center for R&D of Fine ChemicalsCollege of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 400044China Multi-scale Porous Materials center Institute of Advanced Interdisciplinary Studies&School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China College of Physics and center of Quantum Materials and devices Chongqing UniversityChongqing 401331China

The construction of efficient and durable electrocatalysts with highly dispersed metal clusters and hydrophilic surface for alkaline hydrogen evolution reaction(HEr)remains a great ***,we prepared hydrophilic nanocomposites of ru clusters(~1.30 nm)anchored on Na^(+),K^(+)-decorated porous carbon(ru/Na^(+),K^(+)-PC)through hydrothermal method and subsequent annealing treatment at 500℃.The ru/Na^(+),K^(+)-PC exhibits ultralow overpotential of 7 mV at 10 mA·cm^(-2),mass activity of 15.7 A·mgru^(-1)at 100 mV,and long-term durability of 20,000 cycles potential cycling and 200 h chronopotentiometric measurement with a negligible decrease in activity,much superior to benchmarked commercial Pt/*** functional theory based calculations show that the energy barrier of H-OH bond breaking is efficiently reduced due to the presence of Na and K ions,thus favoring the Volmer ***,the ru/Na^(+),K^(+)-PC effectively employs solar energy for obtaining H_(2)in both alkaline water and seawater *** finding provides a new strategy to construct high-performance and cost-effective alkaline HEr electrocatalyst.

关键词： hydrogen evolution reaction decorated porous carbon ultrasmall ru clusters electrocatalysts solar-to-hydrogen

Simultaneous removal of cadmium and sulfamethoxazole from aqueous solution by rice straw biochar

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2013年第7期14卷 640-649页

作者： Xuan HAN Cheng-feng LIANG Ting-qiang LI Kai WANG Hua-gang HUANG Xiao-e YANG Ministry of Education Key Laboratory of Environmental remediation and Ecological Health College of Environmental and Resource Sciences Zhejiang University School of Marine Sciences Ningbo University Tobacco Production Technology center Bijie Tobacco Company of Guizhou Province

The simultaneous sorption behavior and characteristics of cadmium (Cd) and sulfamethoxazole (SMX) on rice straw biochar were investigated. Isotherms of Cd and SMX were well modeled by the Langmuir equation (r2 >0.95). The calculated maximum adsorption parameter (Q) of Cd was similar in single and binary systems (34129.69 and 35919.54 mg/kg, respectively). However, the Q of SMX in a binary system (9182.74 mg/kg) was much higher than that in a single system (1827.82 mg/kg). The presence of Cd significantly promoted the sorption of SMX on rice straw biochar. When the pH ranged from 3 to 7.5, the sorption of Cd had the characteristics of a parabola pattern with maximum adsorption at pH 5, while the adsorption quantity of SMX decreased with increasing pH, with maximum adsorption at pH 3. The amount of SMX adsorbed on biochar was positively correlated with the surface area of the biochar, and the maximum adsorption occurred with d 250 biochar (biochar with a diameter of 150-250 μm). Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIr) showed that the removal of Cd and SMX by rice straw biochar may be attributed to precipitation and the formation of surface complexes between Cd or SMX and carboxyl or hydroxyl groups. The results of this study indicate that rice straw biochar has the potential for simultaneous removal of Cd and SMX from co-contaminated water.

关键词： Biochar rice straw Simultaneous sorption Cadmium (Cd) Sulfamethoxazole (SMX)

PtCu_(3) nanoalloy@porous PWO_(x) composites with oxygen container function as efficient Orr electrocatalysts advance the power density of room-temperature hydrogen-air fuel cells

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Nano research 2022年第10期15卷 9010-9018页

作者： rui Chen Tie Shu Fengling Zhao Yongfei Li Xiaotong Yang Jingwei Li daliang Zhang Li-Yong Gan Ke Xin Yao Qiang Yuan State-Local Joint Laboratory for Comprehensive Utilization of Biomass Center for R&D of Fine ChemicalsCollege of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China State Key Laboratory of Coal Mine disaster dynamics and Control Chongqing UniversityChongqing 400044China Multi-scale Porous Materials center Institute of Advanced Interdisciplinary Studies&School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China College of Physics and center of Quantum Materials and devices Chongqing UniversityChongqing 401331China

It is challenging and desirable to construct Pt-based nanocomposites with oxygen storage function as efficient oxygen reduction reaction(Orr)catalysts for practical proton exchange membrane fuel cells(PEMFCs).Herein,we achieve novel porous nanocomposites of PtCu_(3) nanoalloys-embedded in the PWO_(x) matrix(PtCu_(3)@PWO_(x)),which has an oxygen container *** PtCu_(3)@PWO_(x)/C exhibits an ultrahigh mass activity(MA)of 3.94 A·mgPt−1 for Orr,which is 26.3 times as high as the commercial Pt/C and the highest value ever reported for PtCu-based binary *** calculations reveal that the compressive strain and d-band center downshift of Pt intrinsically contribute to the excellent Orr *** H_(2)-air PEMFCs at room temperature,furthermore,the PtCu_(3)@PWO_(x)/C delivers a high power density(218.6 mW·cm^(−2)),much superior to commercial Pt/C(131.6 mW·cm^(−2)).In H_(2)-O_(2) PEMFCs,PtCu_(3)@PWO_(x)/C outputs a maximum power density of 420.1 mW·cm^(−2).This work provides an effective idea for designing oxygen-storing Orr catalysts used for practical room-temperature H_(2)-air fuel cells.

关键词： porous composite platinum-copper alloy oxygen container oxygen reduction reaction hydrogen-air fuel cell

Catalytic ativities of single-atom catalysts for CO oxidation: Pt_1/FeO_x vs. Fe_1/FeO_x

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Chinese Journal of Catalysis 2017年第9期38卷 1566-1573页

作者： Jinxia Liang Xiaofeng Yang Congqiao Xu Tao Zhang Jun Li guizhou Provincial Key Laboratory of Computational Nano‐Material Science Guizhou Synergetic Innovation Center of Scientific Big Data for Advanced Manufacturing Technology Guizhou Education University Guiyang 550018 Guizhou China department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education Tsinghua University Beijing 100084 China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China

An FeOx‐based Pt single‐atom catalyst(SAC),Pt1/FeOx,has stimulated significant recent interest owing to its extraordinary activity toward CO *** concept of SAC has also been successfully extended to other FeOx supported transition metal systems both experimentally and ***,the FeOx substrate itself(denoted by Fe1/FeOx following the same nomenclature of Pt1/FeOx)as a typical transition metal oxide possesses a very low catalytic activity toward CO oxidation,although it can be viewed as Fe1/FeOx ***,to understand the catalytic mechanism of FeOx‐based SACs for CO oxidation,we have performed density functional theory calculations on Pt1/FeOx and Fe1/FeOx for CO oxidation to address the differences between these two SACs in terms of the catalytic mechanism of CO oxidation and the chemical behavior of the *** calculation results indicated that the catalytic cycle of Fe1/FeOx is much more difficult to accomplish than that of SAC Pt1/FeOx because of a high activation barrier(1.09eV)for regeneration of the oxygen vacancy formed when the second CO2molecule desorbs from the ***,density of states and Bader charge analysis revealed differences in the catalytic performance for CO oxidation by the SACs Fe1/FeOx and Pt1/*** work provides insights into the fundamental interactions between the single‐atom Pt1and FeOx substrate,and the exceptional catalytic performance of this system for CO oxidation.

关键词： Single‐atom catalyst FeOx substrate density functional theory Heterogeneous catalysis CO oxidation

Thermo-Economic Modeling and Evaluation of Physical Energy Storage in Power System

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Journal of Thermal Science 2021年第6期30卷 1861-1874页

作者： HU Shan LIU Chang dING Jie XU Yujie CHEN Haisheng ZHOU Xuezhi Institute of Engineering Thermophysics Chinese Academy of ScienceBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China National Energy Large Scale Physical Energy Storage Technologies r&d center Bijie 551712China

In order to assess the electrical energy storage technologies,the thermo-economy for both capacity-type and power-type energy storage are comprehensively investigated with consideration of political,environmental and social *** for the first time,the Exergy Economy Benefit ratio(EEBr)is proposed with thermo-economic model and applied to three different storage systems in various scenarios,including pumped storage,compressed air energy storage and flywheel energy *** impact of the total system efficiency,annual utilization hour,life time,and other key factors are also *** results show that the EEBrs of pumped storage and compressed air energy storage under peak load shaving condition and flywheel energy storage under frequency modulation service condition are all larger than zero,which means they are all thermo-economically *** extra consideration of political,environmental and social impact,the exergy cost could reduce by about 25%and the EEBr *** sensitivity analysis indicates the similarity and diversity of influence to EEBr between capacity-type and power-type energy storage *** former is that energy efficiency is the dominated factor for all three storage *** latter is that the difference of exergy benefit mode causes variety in other major *** energy-type storage system,like pumped storage and compressed air storage,the peak-to-valley price ratio is very sensitive in energy *** power-type storage system,like flywheel storage,the mileage ratio is in leading position in auxiliary service benefit by *** the three cases studied,the pumped storage has the best thermo-economy;the compressed air energy storage is the second,and the flywheel energy storage is the *** main reason is that the pumped storage has the least non-exergy cost,and flywheel has the most.

关键词： physical energy storage system thermo-economy exergy economy benefit ratio capacity-type energy storage power-type energy storage

Experimental investigation on the distribution uniformity and pressure drop of perforated plate distributors for the innovative spray-type packed bed thermal storage

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Particuology 2022年第2期20卷 60-73页

作者： Lin Lin Liang Wang Xipeng Lin Ningning Xie Haisheng Chen Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China dalian National Laboratory for Clean Energy Chinese Academy of SciencesDalian 116023China National Energy Large Scale Physical Energy Storage Technologies r&d center of Bijie High-tech Industrial development Zone Guizhou 551712China Institute of Science and Technology China Three Gorges CorporationBeijing 100038China

As an innovative thermal energy technology,the spray-type packed bed has advantages of high efficiency and low cost.A liquid distributor is the key component for the spray-type packed bed for scattering heat-transfer liquid drops *** this study,the distribution performance and pressure drop of the perforated plate distributors of different orifice diameters were studied *** experimental results indicate that orifice diameter has a greater effect on the distribution performance compared to flow *** an increase in flow rate,the flow pattern through the distributor changes from the uncovered drop to the covered drop and then to the jet *** covered drop pattern shows the best performance with a good distribution and a small pressure drop simultaneously,which is the design and optimization principle of the distributor for a spray-type packed bed.

关键词： Spray-type packed bed Perforated plate distributor distribution Pressure drop Thermal energy storage

Innovative development path of ethnomedicines： a case study

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Frontiers of Medicine 2017年第2期11卷 297-305页

作者： Zhaoyun Zhu Yali Gui Li Wang Ting Wang Yang Yang Yunzhuang Niu dehuan Fu Jingkun Wang Tao Cui Yunnan Institute of Materia Medica Innovation and R & D Center of Yunnan Baiyao Group Co. Ltd. and Yunnan Province Company KeyLaboratory for New Drug Research and Development of TCM and Ethnomedicines Kunming 650111 China

Innovative development extends the vitality of ethnomedicines. developing ethnomedicines is not only beneficial to the public but also to the related industry and transforms economic growth, driving local social and economic development further. Its economic benefit can be used to optimize and promote the hardware and software of the platform, as well as support the sustainable development of ethnomedicines. Apart from research and discussion on the innovative development of ethnomedicines on the basis of theory and regulations, this series of articles also summarizes cases that are conducive to the overall understanding of the necessity and feasibility of the innovative development. In terms of industrial development, large enterprises and products, such as Yunnan Baiyao, guizhou Miao ethnomedicines, Cheezheng Tibetan Medicine, products developed from dengzhanhua （Erigeron breviscapus）, the Gold series of Yi ethnomedicines, and products developed from Sanqi （Panax notoginseng）, in China are introduced and summarized, focusing on resource superiority, sustainable innovation, standard research and development, and production, as well as intellectual property protection.

关键词： ethnomedicine industry resource advantages continuous innovation standardized development research intellectual property protection

A Surrogate Model for a CAES radial Inflow Turbine with Test data-Based MLP Neural Network Algorithm

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Journal of Thermal Science 2023年第6期32卷 2081-2092页

作者： WANG Xing ZHU Yangli LI Wen ZUO Zhitao CHEN Haisheng National Energy Large Scale Physical Energy Storage Technologies r&d center(Bijie) Bijie551712China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing101408China

It is usually to conduct a full-scale three-dimensional flow analysis for a radial turbine to find a way to increase the efficiency of a Compressed Air Energy Storage(CAES)***,long solving time and huge consumption of computing resources become a major obstacle to the ***,in present study,a surrogate model with test data-based multi-layer perceptron(MLP)Neural Network is proposed to overcome the *** of complex flow field solving process,it provides reliable turbine aerodynamic performance and flow field distribution characteristics in a short solution time by“learning the measurement results”.The validation results illustrated that the predicted maximum relative errors of isentropic efficiency,corrected mass flow rate and corrected power are only 0.03%,0.22%and 0.26%*** predicted flow distribution parameters in chamber,shroud cavity and outlet region of rotor are also basically consistent with the experimental *** the chamber,it can be found that a pressure stagnation point is observed at circumferential angle of 270°when total pressure ratio is *** the shroud cavity,obvious pressure variation is found near outlet of shroud cavity which although labyrinth seals *** outlet of rotor,obvious variations of velocity and pressure are found in the 0.0–0.4 and 0.6–0.8 of blade *** the same time,obvious variations of velocity and pressure are found in the 0.0–0.4 and 0.6–0.8 of blade height and this is because the influence of upper passage vortex,lower passage vortex and end wall secondary *** present study can provide further reference for the dynamic performance evaluation of CAES radial inflow turbine.

关键词： CAES surrogate model radial inflow turbine MLP neural network

Interface-rich Au-doped PdBi alloy nanochains as multifunctional oxygen reduction catalysts boost the power density and durability of a direct methanol fuel cell device

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Nano research 2022年第7期15卷 6036-6044页

作者： Xin Li Ke Xin Yao Fengling Zhao Xiaotong Yang Jingwei Li Yongfei Li Qiang Yuan State-Local Joint Laboratory for Comprehensive Utilization of Biomass Center for R&D of Fine ChemicalsCollege of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025China State Key Laboratory of Coal Mine disaster dynamics and Control Chongqing UniversityChongqing 400044China Key Lab of Organic Optoelectronics&Molecular Engineering Tsinghua UniversityBeijing 100084China Multi-scale Porous Materials center Institute of Advanced Interdisciplinary Studies&School of Chemistry and Chemical EngineeringChongqing UniversityChongqing 400044China

The development of cathode oxygen reduction reaction(Orr)catalysts with high characteristics for practical,direct methanol fuel cells(dMFCs)has continuously increased the attention of *** this work,interface-rich Au-doped PdBi(PdBiAu)branched one-dimensional(1d)alloyed nanochains assembled by sub-6.5 nm particles have been prepared,exhibiting an Orr mass activity(MA)of 6.40 A·mgPd^(−1) and long-term durability of 5,000 cycles in an alkaline *** MA of PdBiAu nanochains is 46 times and 80 times higher than that of commercial Pt/C(0.14 A·mgPt^(−1))and Pd/C(0.08 A·mgPd^(−1)).The MA of binary PdBi nanochains also reaches 5.71 A·mgPd^(−1).Notably,the PdBiAu nanochains exhibit high in-situ carbon monoxide poisoning resistance and high methanol *** actual dMFC device tests,the PdBiAu nanochains enhance power density of 140.1 mW·cm^(−2)(in O_(2))/112.4 mW·cm^(−2)(in air)and durability compared with PdBi nanochains and Pt/*** analysis of the structure–function relationship indicates that the enhanced performance of PdBiAu nanochains is attributed to integrated functions of surficial defect-rich 1d chain structure,improved charge transfer capability,downshift of the d-band center of Pd,as well as the synergistic effect derived from“Pd-Bi”and/or“Pd-Au”dual active sites.

关键词： Au-doped PdBi(PdBiAu)nanochains one-dimensional structure active auxiliary oxygen reduction reaction direct methanol fuel cells