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Effect of hydrogen impurities on hydrogen oxidation activity of Pt/C catalyst in proton exchange membrane fuel cells

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Clean Energy 2023年第1期7卷 139-147页

作者： Yufeng Qin Chaoyong Sun Shaojie Ke Rou Wen Yifan Wang Jing Ji meiling dou State Key Laboratory of Chemical Resource Engineering Laboratory of Electrochemical Process and Technology for materialsBeijing University of Chemical TechnologyBeijing 100029China

High-purity of hydrogen is vital to the guarantee of end usage in proton exchange membrane fuel cell(PEMFC)electric vehicles(EVs)with superior durability and low expense.However,the currently employed hydrogen,primarily from fossil fuel,still contains some poisoning impurities that significantly affect the durability of PEMFCs.Here,we investigate the poisoning effect of several typical hydrogen impurities(S^(2-),Cl^(-),HCOO^(-)and CO_(3)^(2-))on the hydrogen oxidation reaction(HOR)of the state-of-the-art carbon-supported platinum(Pt/C)catalyst used in the PEMFC anode.Electrochemical results indicate that the electrochemically active surface area of Pt/C is hampered by these hydrogen impurities with reduced effective Pt reactive sites due to the competitive adsorption against hydrogen at Pt sites showing the extent of the poisoning on Pt sites in the order:S^(2-)>Cl^(-)>HCOO^(-)>CO_(3)^(2-).Density functional theory calculations reveal that the adsorption energy of S2-on Pt(111)is greater than that of Cl^(-),HCOO^(-)and CO_(2),and the electronic structure of Pt is found to be changed due to the adsorption of impurities showing the downshift of the d-band centre of Pt that weakens the adsorption of hydrogen on the Pt sites.This work provides valuable guidance for future optimization of hydrogen quality and also emphasizes the importance of anti-poisoning anode catalyst development,especially towards H_(2)S impurities that seriously affect the durability of PEMFCs.

关键词： hydrogen impurity poisoning effect electronic structure Pt/C hydrogen oxidation catalysis fuel cell

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Porous microtubes of nickel-cobalt double oxides as non-enzymatic hydrogen peroxide sensors

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Chinese Chemical Letters 2021年第3期32卷 1181-1185页

作者： Qin Li Jin Niu meiling dou Zhengping Zhang Feng Wang State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

Non-enzymatic electrochemical sensors for the determination of hydrogen peroxide(H_(2)O_(2))have attracted more and more concerns.A series of nickel and cobalt double oxides(Ni_(x)Co_(y)-DO)with the different ratios of Ni/Co have been prepared by a polyol-mediated solvothermal method for H_(2)O_(2)detection.The obtained products exhibit honeycomb-like open porous microtubes constituted with the low-dimensional nanostructured Ni_(x)Co_(y)-DO blocks after the calcination treatment.Compared with nickel oxides,the introduced Co ions in Ni_(x)Co_(y)-DO can induce the production of surficial oxygen vacancies,and further enhance the electrode surface activity.In particular,the NiCo-DO sample(with an atomic ratio of Ni/Co=4:3)shows the richest surficial oxygen vacancies and presents the highest H_(2)O_(2)detection activity among all the as-prepared samples,demonstrating an excellent sensitivity of698.60μAL mmol^(-1)cm^(-2)(0~0.4 mmol/L),low detection limit(0.28μmol/L,S/N=3),as well as long stability,high selectivity and good reproducibility.This work lends a new impetus to the potential application of double metal oxides for the next generation of non-enzymatic sensors.

关键词： double metal oxides Porous microtubes Oxygen vacancies Hydrogen peroxide detection Electrochemical sensors

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Pt/WO_3/C nanocomposite with parallel WO_3 nanorods as cathode catalyst for proton exchange membrane fuel cells

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Journal of Energy Chemistry 2015年第1期24卷 39-44页

作者： meiling dou Ming Hou Zhilin Li Feng Wang Dong Liang Zhigang Shao Baolian Yi State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical Technology Fuel Cell System and Engineering Laboratory Dalian Institute of Chemical Physics Chinese Academy of Sciences

Pt/WO3/C nanocomposites with parallel WO3 nanorods were synthesized and applied as the cathode catalyst for proton exchange membrane fuel cells （PEMFCs）. Electrochemical results and single cell tests show that an enhanced activity for the oxygen reduction reaction （ORR） is obtained for the Pt/WO3/C catalyst compared with Pt/C. The higher catalytic activity might be ascribed to the improved Pt dispersion with smaller particle sizes. The Pt/WO3/C catalyst also exhibits a good electrochemical stability under potential cycling. Thus, the Pt/WO3/C catalyst can be used as a potential PEMFC cathode catalyst.

关键词： tungsten oxides Pt nanoparticles catalyst proton exchange membrane fuel cells

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Effect of load-cycling amplitude on performance degradation for proton exchange membrane fuel cell

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Chinese Chemical Letters 2021年第10期32卷 3159-3163页

作者： Kun Wang Ning Li Yanan Yang Shaojie Ke Zhengping Zhang meiling dou Feng Wang State Key Laboratory of Chemical Resource Engineering Beijing Key Laboratory of Electrochemical Process and Technology for MaterialsBeijing University of Chemical TechnologyBeijing 100029China Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China

Durability is one of the critical issues to restrict the commercialization of proton exchange membrane fuel cells(PEMFCs) for the vehicle application.The practical dynamic operation significantly affects the PEMFCs durability by corroding its key components.In this work,the degradation behavior of a single PEMFC has been investigated under a simulated automotive load-cycling operation,with the aim of revealing the effect of load amplitude(0.8 and 0.2 A/cm2 amplitude for the current density range of0.1-0.9 and 0.1-0.3 A/cm^(2),respectively) on its performance degradation.A more severe degradation on the fuel cell performance is observed under a higher load amplitude of 0.8 A/cm^(2) cycling operation,with$10.5% decrease of cell voltage at a current density of 1.0 A/cm2.The larger loss of fuel cell performance under the higher load amplitude test is mainly due to the frequent fluctuation of a wider potential cycling.Physicochemical characterizations analyses indicate that the Pt nanoparticles in cathodic catalyst layer grow faster with a higher increase extent of particle size under this circumstance because of their repeated oxidation/reduction and subsequent dissolution/agglomeration process,resulting in the degradation of platinum catalyst and thus the cell performance.Additionally,the detected microstructure change of the cathodic catalyst layer also contributes to the performance failure that causes a distinct increase in mass transfer resistance.

关键词： Proton exchange membrane fuel cell Durability Load-cycling amplitude Degradation mechanism Platinum catalyst

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氢气中杂质对车用燃料电池性能影响的研究进展

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化工进展 2021年第9期40卷 4815-4822页

作者：何广利窦美玲北京低碳清洁能源研究院新能源技术研究中心北京102211 北京化工大学材料科学与工程学院北京100029

车用质子交换膜燃料电池(proton exchangemembranefuelcells,PEMFCs)的耐久性是制约氢能在交通领域商业化应用的关键因素之一。阳极燃料气中含有的微量H2S、CO和NH3等杂质是影响PEMFCs耐久性的最主要因素之一。本文综述了PEMFCs阳极氢... 详细信息

车用质子交换膜燃料电池(proton exchangemembranefuelcells,PEMFCs)的耐久性是制约氢能在交通领域商业化应用的关键因素之一。阳极燃料气中含有的微量H2S、CO和NH3等杂质是影响PEMFCs耐久性的最主要因素之一。本文综述了PEMFCs阳极氢气中存在的三种关键杂质,即H2S、CO和NH3对PEMFCs阳极性能影响的研究进展,包括杂质毒化机制、动力学、燃料电池操作条件影响以及缓解策略,讨论了氢气杂质容限值规定的理论和实验基础。最后,指出了目前氢气杂质对车用PEMFCs影响研究存在的技术问题及未来发展方向,重点指出了根据我国PEMFCs技术发展水平精准推定满足我国车用燃料电池耐久性的氢气杂质容限值的必要性和紧迫性,从而为优化和完善我国车用燃料电池用氢质量标准提供基础数据,促进车用燃料电池寿命的提升。

关键词：车用质子交换膜燃料电池耐久性氢气杂质容限值

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不同衰退机理对PEMFC怠速工况性能衰退影响的模拟研究

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太阳能学报 2021年第3期42卷 414-421页

作者：罗马吉杨俊玮赵岩陈奔王琨窦美玲武汉理工大学现代汽车零部件技术湖北省重点实验室武汉430070 武汉理工大学燃料电池湖北省重点实验室武汉430070 北京化工大学材料科学与工程学院北京100029

分析质子交换膜燃料电池(PEMFC)怠速工况衰退机理,确定怠速工况不同衰退机理对燃料电池模型参数的影响,采用所建立的PEMFC二维等温多物理场模型,仿真研究燃料电池在怠速工况衰退前后的性能及各种衰退因素对电压衰减量的贡献和内部反应... 详细信息

分析质子交换膜燃料电池(PEMFC)怠速工况衰退机理,确定怠速工况不同衰退机理对燃料电池模型参数的影响,采用所建立的PEMFC二维等温多物理场模型,仿真研究燃料电池在怠速工况衰退前后的性能及各种衰退因素对电压衰减量的贡献和内部反应气体分布变化。研究结果表明,阴极活化损失增大是怠速工况下最重要的衰退因素,其次是开路电压衰退,影响最小的是阴极电化学活性面积衰退;在相同操作条件下,衰退后燃料电池的最低氧气摩尔浓度和最低氢气摩尔浓度上升,电流密度分布不均匀现象加剧。

关键词：质子交换膜燃料电池衰退机理极化曲线怠速工况衰退模拟

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纯相SnO_2纳米晶薄膜的一步电沉积制备及其结构与光电性能研究

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北京化工大学学报（自然科学版） 2017年第3期44卷 19-25页

作者：刘萌窦美玲李志林吉静王峰北京化工大学材料科学与工程学院材料电化学过程与技术北京市重点实验室北京100029

采用一步电沉积在氧化铟锡(ITO)导电玻璃基底上制备纯相SnO_2纳米晶薄膜材料,通过改变沉积条件,研究沉积电位、镀液温度和HNO_3浓度对薄膜组成结构的影响。结果表明:当沉积电位为-0.9 V(vs.SCE),镀液温度为65℃,HNO_3浓度为50 mmol/L时... 详细信息

采用一步电沉积在氧化铟锡(ITO)导电玻璃基底上制备纯相SnO_2纳米晶薄膜材料,通过改变沉积条件,研究沉积电位、镀液温度和HNO_3浓度对薄膜组成结构的影响。结果表明:当沉积电位为-0.9 V(vs.SCE),镀液温度为65℃,HNO_3浓度为50 mmol/L时,所制备的SnO_2纳米晶薄膜为纯相金红石型结构,且薄膜相对连续致密。光电性能测试表明,该薄膜具有优异的光电性能,在可见光区透光率大于90%,带隙为3.75 e V,且电阻率为2.2×10^(-3)Ω·cm,载流子浓度为1.9×10^(20)cm^(-3),载流子迁移率为14.8 cm^2/(V·s)。故所制备的SnO_2纳米晶薄膜是太阳能电池的理想窗口层材料。

关键词：纯相SnO2 纳米晶薄膜电沉积太阳能电池窗口层材料

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基于AMESim的乳化液泵特性仿真

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机床与液压 2009年第6期37卷 217-218,224页

作者：曹春玲窦美玲滕以金西安科技大学机械工程学院陕西西安710054

为了对乳化液泵的特性进行研究,在AMESim中建立RBW315/31.5型乳化液泵液压系统模型,对吸排液阀的开启、关闭过程及腔内压力的变化和冲击现象进行了研究分析,基于AMESim的液压系统仿真研究,物理意义明晰,分析灵活方便,对于分析研究乳化... 详细信息

为了对乳化液泵的特性进行研究,在AMESim中建立RBW315/31.5型乳化液泵液压系统模型,对吸排液阀的开启、关闭过程及腔内压力的变化和冲击现象进行了研究分析,基于AMESim的液压系统仿真研究,物理意义明晰,分析灵活方便,对于分析研究乳化液泵的性能具有重要意义。

关键词：乳化液泵仿真 AMESim

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高校教工、研究生、本科生党支部共建体系研究

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科教文汇 2020年第5期 24-25页

作者：汤志松徐杰窦美玲北京化工大学

党支部是高校思想政治工作的基层党组织,教工、研究生、本科生党支部在发挥战斗堡垒作用中发挥着各自的重要作用,创新高校的党支部设置,是高校思想政治工作的必由之路。本文分析了教工、研究生、本科生党支部的特点,为了加强师生关系,... 详细信息

党支部是高校思想政治工作的基层党组织,教工、研究生、本科生党支部在发挥战斗堡垒作用中发挥着各自的重要作用,创新高校的党支部设置,是高校思想政治工作的必由之路。本文分析了教工、研究生、本科生党支部的特点,为了加强师生关系,提出了由高校教工、研究生、本科生联合成立纵向党支部的建议。

关键词：高校纵向党支部共建体系

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Microstructure and heat treatment for Ni3Al-based single crystal alloy with different crystal orientations

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Progress in Natural Science:Materials International 2020年第4期30卷 533-538页

作者： Liwu Jiang Xuezheng dou meiling Wu Min Cai National Center for Materials Service Safety University of Science and Technology Beijing Beijing Institute of Aeronautical Materials Avic Manufacturing Technology Institute NCS Testing Technology Co. Ltd.

NiAl-based single crystal alloy IC6SX with different crystal orientations were prepared by seed crystal method.The microstructure and heat treatment of the alloy were investigated. The results showed that the microstructure of the alloy was in dendrite structure, and the crystal orientation had significant effect on the dendrite morphology of this alloy. The precipitated phases of(MoNi)C and Ni Mo appeared in the microstructure of the three alloys with different crystal orientations during solidification process. Compared with other two alloys, the volume fractions of precipitated phases of both(Mo Ni)6 C and Ni Mo was the most in the alloy with [111]orientation and the least in the alloy with [001] orientation. The solidus and liquidus temperatures of the alloy IC6SX tested by differential scanning calorimetry(DSC) were 1356 °C and 1387 °C, respectively. Meanwhile, the effect of different solution temperatures on the microstructure of the alloy with different orientations was studied. The results showed that the precipitated phases of(MoNi)C and Ni Mo were eliminated with the solid solution treatment under the condition of 1300 °C/10 h. However, the incipient melting of the alloys occurred due to the dissolution of low melting point phases. As the temperature dropped to 1280 °C, the area of incipient melting in the alloy with different orientations decreased gradually. However, there was no incipient melting appearing in the three alloys with different orientations when the solution treatment temperature dropped to 1260 °C.

关键词： Ni 3 Al-Based Single crystal superalloy Crystal orientation Heat treatment IC6SX

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