检索结果-南通市图书馆

Highly efficient and stable electrocatalyst for hydrogen evolution by molybdenum doped Ni-Co phosphide nanoneedles at high current density

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第3期17卷 1066-1074页

作者： Chengyu Huang Zhonghong Xia Jing Wang Jing Zhang Chenfei Zhao Xingli Zou Shichun Mu Jiujun Zhang xionggang Lu Hong Jin Fan Shengjuan Huo Yufeng Zhao College of Sciences&Institute for Sustainable Energy Shanghai UniversityShanghai 200444China State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource ReuseYanshan UniversityQinhuangdao 066004China State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore639798

There is an increasingly urgent need to develop cost-effective electrocatalysts with high catalytic activity and stability as alternatives to the traditional Pt/C in catalysts in water *** this study,microspheres composed of Mo-doped NiCoP nanoneedles supported on nickel foam were prepared to address this *** results show that the nanoneedles provide sufficient active sites for efficient electron transfer;the small-sized effect and the micro-scale roughness enhance the entry of reactants and the release of hydrogen bubbles;the Mo doping effectively improves the electrocatalytic performance of NiCoP in alkaline *** catalyst exhibits low hydrogen evolution overpotentials of 38.5 and 217.5 mV at a current density of 10 mA·cm^(-2) and high current density of 500 mA·cm^(-2),respectively,and only 1.978 V is required to achieve a current density of 1000 mA·cm^(-2) for overall water *** functional theory(DFT)calculations show that the improved hydrogen evolution performance can be explained as a result of the Mo doping,which serves to reduce the interaction between NiCoP and intermediates,optimize the Gibbs free energy of hydrogen adsorption(△G_(*H)),and accelerate the desorption rate of **** study provides a promising solution to the ongoing challenge of designing efficient electrocatalysts for high-current-density hydrogen production.

关键词： transition metal phosphides Mo-doped NiCoP hydrogen evolution reaction gradient hydrothermal water splitting

Recent Advances in Electrochemical-Based Silicon Production Technologies with Reduced Carbon Emission

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research 2024年第1期2023卷 209-236页

作者： Feng Tian Zhongya Pang Shen Hu Xueqiang Zhang Fei Wang Wei Nie Xuewen Xia Guangshi Li Hsien-Yi Hsu Qian Xu Xingli Zou Li Ji xionggang Lu State Key Laboratory of Advanced Special Steel&Shanghai Key Laboratory of Advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai University99#Shangda RoadShanghai 200444China Center for Hydrogen Metallurgy Technology Shanghai UniversityShanghai 200444China State Key Laboratory of ASIC and System School of MicroelectronicsFudan University220#Handan RoadShanghai 200433China School of Energy and Environment Department of Materials Science and EngineeringCity University of Hong KongKowloon TongHong KongChina

Sustainable and low-carbon-emission silicon production is currently one of the main focuses for the metallurgical and materials science ***,considered a promising strategy,has been explored to produce silicon due to prominent advantages:(a)high electricity utilization efficiency;(b)low-cost silica as a raw material;and(c)tunable morphologies and structures,including films,nanowires,and *** review begins with a summary of early research on the extraction of silicon by *** has been placed on the electro-deoxidation and dissolution–electrodeposition of silica in chloride molten salts since the 21st century,including the basic reaction mechanisms,the fabrication of photoactive Si films for solar cells,the design and production of nanoSi and various silicon components for energy conversion,as well as storage ***,the feasibility of silicon electrodeposition in room-temperature ionic liquids and its unique opportunities are *** this basis,the challenges and future research directions for silicon electrochemical production strategies are proposed and discussed,which are essential to achieve large-scale sustainable production of silicon by electrochemistry.

关键词： directions electrodeposition electricity

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

炭黑对CMDB推进剂燃烧性能的影响

化学推进剂与高分子材料 2024年第3期22卷 46-49页

作者：宋桂贤吴雄岗陕西工业职业技术学院陕西咸阳712000 西安近代化学研究所陕西西安710065

采用燃烧–靶线法分析了炭黑的种类、含量及粒径对复合改性双基(CMDB)推进剂燃烧性能的影响。结果表明:在压强为1~8MPa时,添加炭黑可以提高推进剂的燃速,Y1炭黑可以有效减小推进剂配方的压强指数;当Y1炭黑在推进剂配方中含量较低时,推... 详细信息

采用燃烧–靶线法分析了炭黑的种类、含量及粒径对复合改性双基(CMDB)推进剂燃烧性能的影响。结果表明:在压强为1~8MPa时,添加炭黑可以提高推进剂的燃速,Y1炭黑可以有效减小推进剂配方的压强指数;当Y1炭黑在推进剂配方中含量较低时,推进剂样品在压强为3~8MPa时具有平台燃烧特性,小粒径的Y1炭黑有利于推进剂配方压强指数的降低。

关键词：炭黑 CMDB推进剂燃烧性能压强指数

在线全文

学校读者我要写书评

暂无评论

高温场下矿井煤层钻孔瓦斯抽排效果研究

煤矿安全 2024年第7期55卷 9-14页

作者：杨进谢雄刚丁锐曹文梁熊欣标贵州大学矿业学院贵州贵阳550025 六盘水市水城区能源局贵州六盘水553000 中煤科工集团沈阳研究院有限公司辽宁抚顺113122 煤矿安全技术国家重点实验室辽宁抚顺113122

针对我国煤矿低透气性突出煤层瓦斯抽放困难问题,以贵州省麦子沟煤矿K15煤层采煤工作面运输巷为工程背景,通过建立高温场下矿井采掘工作面排放钻孔瓦斯流动多场耦合模型,模拟研究了不同加热温度、钻孔孔径及不同钻孔间距下的煤层钻孔瓦... 详细信息

针对我国煤矿低透气性突出煤层瓦斯抽放困难问题,以贵州省麦子沟煤矿K15煤层采煤工作面运输巷为工程背景,通过建立高温场下矿井采掘工作面排放钻孔瓦斯流动多场耦合模型,模拟研究了不同加热温度、钻孔孔径及不同钻孔间距下的煤层钻孔瓦斯排放效果。研究表明:温度对煤层瓦斯排放效果影响显著,当加热温度为86℃时,瓦斯压力降低明显;钻孔孔径对煤层瓦斯排放效果影响较大,当孔径为113 mm时,钻孔之间瓦斯压力最大为0.36 MPa,最大瓦斯压力同比下降了14.28%,钻孔瓦斯排放量提高了27.27%;钻孔间距对煤层瓦斯压力与排放效果影响也十分明显,当钻孔间距为1 m时,钻孔之间瓦斯压力最大为0.45 MPa,影响范围为5.72 m,相比钻孔间距为1.5 m时,瓦斯压力下降幅度增加了37.8%,相比钻孔间距为0.75 m时,影响范围增加了18.18%,综合瓦斯排放效果最好;对比不同方案的模拟结果,数值模拟方案9对应的瓦斯排放效果最佳。

关键词：瓦斯解吸瓦斯排放密闭巷道高温场瓦斯灾害

ZnFe2O4 deposited on BiOCl with exposed （001） and （010） facets for photocatalytic reduction of C02 in cyclohexanol

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2017年第2期11卷 197-204页

作者： Guixian Song xionggang Wu Feng Xin Xiaohong Yin School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China School of chemical engineering and textile Shaanxi Polytechnic Institue Xianyang 712000 China Xi'an Modem Chemistry Research Institute Xi'an 710065 China School of Chemistry and Chemical Engineering Tianjin University of Technology Tianjin 300384 China

ZnFe2O4-BiOC1 composites were prepared by both hydrothermal and direct precipitation processes and the structures and properties of the samples were characterized by various instrumental techniques. The samples were then used as catalysts for the photocatalytic reduction of CQ in cyclohexanol under ultraviolet irradiation to give cyclohexanone （CH） and cyclohexyl formate （CF）. The photocatalytic CO2 reduction activities over the hydrothermally prepared ZnFeaO4-BiOCl composites were higher than those over the directly-precipitated composites. This is because compared to the direct-precipitation sample, the ZnFe2O4 nanoparticles in the hydrothermal sample were smaller and more uniformly distributed on the surface of BiOCl and so more heterojunctions were formed. Higher CF and CH yields were obtained for the pure BiOCl and BiOCl composite samples with more exposed （001） facets than for the samples with more exposed （010） facets. This is due to the higher density of oxygen atoms in the exposed （001） facets, which creates more oxygen vacancies, and thereby improves the separation efficiency of the electron-hole pairs. More importantly, irradiation of the （001） facets with ultraviolet light produces photo-generated electrons which is helpful for the reduction of CO2 to -CO2^-. The mechanism for the photocatalytic reduction of CO2 in cyclohexanol over ZnFe204-BiOCl composites with exposed （001） facets involves electron transfer and carbon radical formation.

关键词： reduction of CO2 cyclohexanol ZnFe2O4 deposited BiOCl facet composite photocatalyst

Hydrogen production from simulated hot coke oven gas by catalytic reforming over Ni/Mg(Al)O catalysts

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2009年第2期18卷 225-231页

作者： Hongwei Cheng Baohua Yue XueguangWang xionggang Lu Weizhong Ding Shanghai Key Laboratory of Modern Metallurgy and Materials Processing Shanghai University Shanghai 200072 China Department of Chemistry Shanghai University Shanghai 200072 China

Hydrogen production by catalytic reforming of simulated hot coke oven gas （HCOG） with toluene as a model tar compound was investigated in a fixed bed reactor over Ni/Mg（Al）O catalysts. The catalysts were prepared by a homogeneous precipitation method using urea hydrolysis and characterized by ICE BET, XRD, TPR, TEM and TG. XRD showed that the hydrotalcite type precursor after calcination formed （Ni, Mg）Al2O4 spinel and Ni-Mg-O solid solution structure. TPR results suggested that the increase in Ni/Mg molar ratio gave rise to the decrease in the reduction temperature of Ni^2＋ to Ni^0 on Ni/Mg（Al）O catalysts. The reaction results indicated that toluene and CH4 could completely be converted to H2 and CO in the catalytic reforming of the simulated HCOG under atmospheric pressure and the amount of H2 in the reaction effluent gas was about 4 times more than that in original HCOG. The catalysts with lower Ni/Mg molar ratio showed better catalytic activity and resistance to coking, which may become promising catalysts in the catalytic reforming of HCOG.

关键词： hydrogen production coke oven gas tar toluene hydrotalcite

Oxygen Permeation and Stability of Ce_(0.8)Gd_(0.2)O_(2-δ)-PrBaCo_(2-x)FexO_(5+δ) Dual-phase Composite Membranes

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2014年第12期30卷 1174-1180页

作者： Bo Jiang Hongwei Cheng Longfei Luo xionggang Lu Zhongfu Zhou Shanghai Key Laboratory of Modern Metallurgy and Materials Processing School of Materials Science and EngineeringShanghai University

Dual-phase membranes of 60 wt% Ce0.8Gd0.2O2-δ-40 wt% Pr Ba Co2exFexO3 d（0 x 2） were prepared by a combined citrate and ethylene diamine tetraacetic acid（EDTA） complexing method. X-ray diffraction（XRD）results revealed the good chemical compatibility between ion-conducting phase CGO and electron-conducting phases PBC2 xFxO after sintering in air. The Fe ionic dopant had a significant effect on the phase structure stability and oxygen permeability under CO2 atmosphere, which was confirmed by XRD, thermogravimetrye differential scanning calorimetry（TGeD SC）, scanning electron microscopy（SEM） and oxygen permeation experiments. CGOeP BC0.5F1.5O dual-phase membrane demonstrated a stable oxygen permeation flux of2.71x10-7mol cm 2s 1with 50 mol% He/CO2 as the sweep gas at 925 C, and this value was much higher than that of perovskite-type membranes. The rate-limiting step in the oxygen permeation process changed from the bulk diffusion to the surface oxygen exchange when the CGOeP BC0.5F1.5O membrane thickness decreased to 0.8 mm or less. Due to the high oxygen permeation fluxes and the excellent structural stability under CO2 atmosphere, the CGOeP BC0.5F1.5O membrane is a great potential candidate material for separating oxygen from air in the oxy-fuel combustion techniques.

关键词： Dual-phase membrane Phase stability Oxygen permeation CO2-tolerance

弹性装置缓冲下矿井突出冲击波能量衰减规律研究

在线全文

学校读者我要写书评

暂无评论

中国安全生产科学技术 2024年第10期20卷 81-87页

作者：任美容谢雄刚骆家宁陈学习贵州大学矿业学院贵州贵阳550025 华北科技学院矿山安全学院河北廊坊065201

为控制煤与瓦斯突出冲击波巨大的能量对井下工作人员和通风设施带来损害,设计出1种安装于矿井巷道两壁的弹性装置以加速突出冲击波能量的衰减,人为使突出冲击波能量加速衰减至安全等级;运用数值模拟软件Fluent进行不同有效断面变化(不... 详细信息

为控制煤与瓦斯突出冲击波巨大的能量对井下工作人员和通风设施带来损害,设计出1种安装于矿井巷道两壁的弹性装置以加速突出冲击波能量的衰减,人为使突出冲击波能量加速衰减至安全等级;运用数值模拟软件Fluent进行不同有效断面变化(不变、变大和变小)和不同突出压力(0.6,0.8,1.0 MPa)下冲击波能量的衰减规律研究。研究结果表明:不同有效断面变化的弹性装置均能加速突出冲击波的能量衰减,弹性装置设置越多同一时刻传递到巷道末尾的冲击波能量越少;相较于有效断面不变和变大,弹性装置有效断面变小对突出冲击波能量衰减的效果最好;突出压力与冲击波能量呈正相关,突出压力的改变对弹性装置有效断面变小时影响很小,对加速冲击波能量衰减的效果很稳定。研究结果可为防治煤与瓦斯突出灾害提供理论参考。

关键词：冲击波煤与瓦斯突出弹性装置数值模拟有效断面

Perovskite-type oxygen-permeable membrane BaCo_(0.7)Fe_(0.2)Nb_(0.1)O_(3-δ) for partial oxidation of methane in coke oven gas to hydrogen

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2010年第3期29卷 231-237页

作者： ZHANG Yuwen LIU Jiao LIU Yong DING Weizhong LU xionggang Shanghai Key Laboratory of Modern Metallurgy ＆ Materials Processing Shanghai University Shanghai 200072 China

Perovskite-type oxygen-permeable membrane reactors of BaCo0.7Fe0.2Nb0.1O3-δ （BCFNO） packed with Ru-based catalyst had high oxygen permeability and could be used for hydrogen production by partial oxidation of methane in coke oven gas （COG）. At 1173 K, 94% of methane conversion, 85% of H2 selectivity, 107% of CO selectivity, and as high as 15.4 mL·cm^-2·min^-1 of oxygen permeation flux were obtained. The BCFNO membrane itself had poor catalytic activity to partial oxidation of CH4 in COG. During continuous operation for 70 h at 1173 K, no degradation of the membrane reaction performance was observed. XRD and SEM characterization also demonstrated that the BCFNO membrane reactor exhibited good stability in partial oxidation of methane in COG.

关键词： hydrogen production coke oven gas methane conversion oxygen permeation oxygen-permeable membrane