酞菁锰-表面活性剂薄膜电极的电化学表征及其对三氯乙酸的电化学催化作用的研究

将酞菁锰（ＭｎＰｃ）掺入阳离子表面活性剂双十二烷基二甲基溴化铵（ＤＤＡＢ）的氯仿溶液，并涂布于热解石墨电极表面，待氯仿挥发后即制得ＭｎＰｃ－ＤＤＡＢ薄膜电极。循环伏安实验表明，在ＫＢｒ溶液中，该薄膜电极有两对还原氧化峰，第一对峰的Ｅｐｃ１＝－０．２７Ｖ，Ｅｐａ１＝０．０１Ｖ；第二对峰的Ｅｐｃ２＝－０．７６Ｖ，Ｅｐａ２＝－０．６２Ｖ（ｖｓ．ＳＣＥ）。本文着重探讨了第二对峰的电化学行为，估计了该体系的电荷传递扩散系数Ｄｃｔ和表观非均相电极反应速率常数Ｋ０′等电化学参数，并可将该薄膜电极用于催化三氯乙酸的电化学还原。     

天青Ⅰ修饰电极的电化学性质及对血红蛋白的电催化还原

天青Ⅰ修饰电极在ＰＨ＝５．５的ＨＡｃ－ＮａＡｃ缓冲溶液中，在０．３－－０．７Ｖ电位范围内表现出可逆的氧化还原行为，其表面式量电位Ｅ＾０＝－０．２１Ｖ该电极对血红蛋白的还原过程具有良好的催化作用。     

Na3AlF6-Al2O3熔盐体系中ZnFe2O4基阳极的电化学行为

研究了ＺｎＦｅ２Ｏ４基阳极在Ｎａ３ＡｌＦ６－Ａｌ２Ｏ３熔盐体系中的电化学稳定性，讨论了电极的析氧历程并得到了析氧过电位与阳极表观电流密度之间的Ｔａｆｅｌ关系式，η＝０．１２＋０．０５２ｌｏｇｉ（ｉ＝０．０１５－０．４４Ａ／ｃｍ＾２）用三角波电位扫描法测定了电极析氧过程的伏安曲线。     

酞菁锰—表面活性剂薄膜电极的电化学表征及其对三氯乙酸的电化学催 …

将酞菁锰（ＭｎＰｃ）掺入阳离子表面活性剂双十二烷基二甲基溴化铵（ＤＤＡＢ）的氯仿溶液，并涂布于热解石墨电极表面，待氯仿挥发后即制得ＭｎＰｃ－ＤＤＡＢ薄膜电极，循环伏安实验表明，在ＫＢｒ溶液中，该薄膜电极有两对还原氧化峰，第一对峰的Ｅｐｃｔ＝－０．２７Ｖ，Ｅｐａ１＝０．０１Ｖ；第二对峰的Ｅｐｃ２＝－０．７６Ｖ，Ｅｐａ２＝－０．６２Ｖ（ｖｓ．ＳＣＥ）。本文着重探讨了第二对峰的电化学行为，估计了该体系电     

酞菁镍—表面活性剂薄膜修饰电极及其催化性能的研究

将酞菁镍（ＮｉＰｃ）掺入阳离子表面活性剂双十二烷基二甲基溴化铵（ＤＤＡＢ）的氯仿溶液中，并涂布于热解石墨电极表面，待氯仿挥发后制得ＮｉＰｃ－ＤＤＡＢ薄膜电极。循环伏安实验表明，在ＫＢｒ溶液中，该薄膜电极有两对良好且稳定的还原氧化峰，第一对峰的Ｅｐｃ１＝－０．６４Ｖ，Ｅｐａｌ＝－０．６０Ｖ（ｖｓ．ＳＣＥ）；第二对峰的Ｅｐｃ２＝－０．８４Ｖ，Ｅｐａ２＝－０．８０Ｖ。本文着重探讨了第二对峰的电化学行为，     

硫堇衍生化自组装膜修饰金电极的电化学性质及其对抗坏血…

将硫堇共价键合到自组装在金电极表面的半胱胺单分子层上，制成了衍生化自组装单分子膜修饰电极，并用电化学方法研究了它的电化学性质，循环伏安图显示其在ｐＨ＝７．７的磷酸盐缓冲液中，于－０．４５～＋０．５０Ｖ（ｖｓ．ＳＣＥ）范围内有２对氧化还原峰，峰电位分别为Ｅｐａ＝２１４ｍＶ，Ｅｐｃ＝８２ｍＶ，Ｅ＾２ｐａ＝－７５ｍＶ，Ｅ＾２ｐｃ－－１６０ｍＶ（ｖｓ．ＳＣＥ），ｐＨ在５．０～９．０范围内，峰１有２个质子参     

头孢唑啉降解产物在银亚微盘电极上的电化学行为及其测定

基于头孢唑啉在 ０．１０ｍｏｌ／Ｌ ＮａＯＨ溶液中水浴降解产物中含有巯基（－ＳＨ），在 ｐＨ ５．０ＮａＡｃ－ＨＡｃ介质中，于银亚微盘电极上产生一灵敏的吸附伏安氧化还原峰，其峰电位分别为 Ｅｐａ＝－０．５３０Ｖ和 ＥＰｃ＝－０．４００Ｖ。动力学研究表明：电极反应的电子转移数为０．９１，表观电子传递速率为ｋｓ＝０．１０ｓ－１，峰电流与头孢唑啉浓度在１．０×１０－６～５０×１０－１ｍｏｌ／Ｌ范围内呈良好的线性关系。方法可应用于人工合成样品头孢啉的检测。     

氯氮平的吸附伏安行为

在０．１ｍｏｌ／ＬＮＨ４Ａｃ（ｐＨ７．８）底液中，氯氮平（ＣＬＰ）在汞电极上有一线性扫描还原峰，Ｅｐｃ＝－１．３４Ｖ（ｖｓ．Ａｇ／ＡｇＣｌ）．该峰具有明显的吸附性，吸附粒子为ＣＬＰ中性分子．测得ＣＬＰ在汞电极上的饱和吸附量为２．７×１０－１０ｍｏｌ／ｃｍ２，每个ＣＬＰ分子所占电极面积为０．６２ｎｍ２，ＣＬＰ在悬汞电极上的吸附符合Ｆｒｕｍｋｉｎ等温式．测得吸附系数β＝６．２８×１０５，吸引因素γ＝０．７５，电子转移数ｎ为２，不可逆吸附的转移系数α为０．５３．探讨了ＣＬＰ在汞电极上的还原机理，并建立了吸附溶出伏安法测定ＣＬＰ的最佳条件，检测限为８．０×１０－９ｍｏｌ／Ｌ．     

熔融碳酸盐燃料电池研究

以烧结Ｎｉ作电极，以ＬｉＡｌＯ２无机膜作电池隔膜，组装成了电极而积２８ｃｍ＾２的小型熔融碳酸盐燃料电池，试验了各种工作条件对电池性能的影响，电池经多次启动性能无衰减，放电电流密度１００ｍＡ／ｃｍ＾２，电池电压０．９５Ｖ，放电电流密度１２５ｍＡ／ｃｍ＾２，电池输出功率１１４ｍＷ／ｃｍ＾２，燃料气利用率８０％，电池能量效率３１％。     

卡可西灵在汞电极上的电化学行为和吸附特性

在ＨＡｃ－ＮａＡｃ底液中，卡可西灵在汞电极上有两个还原峰，第一峰峰电位Ｅｐｃ１＝０．０４Ｖ（ｖｓ．Ａｇ／ＡｇＣｌ），为２电子转移的可逆过程；第二峰峰电位Ｅｐｃ２＝－０．３９Ｖ，为４电子转移的不可逆过程，第二峰具有明显的吸附性。本文探讨了该吸附特性，认为吸附型体为中性分子，属于不可逆吸附体系。测得其电极反应动力学参数αｎα和卡可西灵在汞电极上的饱和吸附量，估计了每个卡可西灵分子所占的面积，建立了测定     

Application of electrospinning for the fabrication of proton-exchange membrane fuel cell electrodes

Electrospun materials have been gaining great interest in the energy sector. Their tunability and robustness make them highly attractive, particularly for proton-exchange membrane fuel cell (PEMFC) electrodes. Conventional PEMFC electrodes, prepared by either spraying, painting, or slot-die coating, have not yet met the needs of large-scale PEMFC use. Electrospinning of fibrous materials has already shown great promise as an alternative methodology for electrode fabrication. Electrospinning has been used in fuel cell electrodes through two primary means: (1) segmented carbon or inorganic fibers to serve as precious metal catalyst support, and (2) high aspect ratio polymer/particle fibers to serve directly as the electrode. The use of electrospun fibrous electrodes has led to improved PEMFC durability and increased power output at low catalyst loadings, both of which are of paramount importance to large-scale commercialization of PEMFC electric vehicles.     

质子交换膜燃料电池电极的一种新的制备方法

提出一种新的电极制备方法 ,在薄层催化层电极制备中加入造孔剂 ,并使用喷涂方法 ,使质子交换膜燃料电池 (PEMFC)电极中铂担量降到 0 .0 2mgPt/cm2 .与文献方法相比 ,新方法过程简单、成本低、易放大 .并通过实验得到电极的最佳组成为 :催化剂 :造孔剂 :Nafion =3:3:1 .采用此方法制备的电极 (0 .0 2mgPt/cm2 )与Nafion 1 1 5膜组装成电池 ,单池工作电压为 0 .7V时 ,每毫克铂可产生 2 0A的电流 ,每千瓦电池组仅需 72mgPt .     

质子交换膜燃料电池Pt/C阴极氧还原动力学模拟

质子交换膜燃料电池的商业化应用迫切要求降低其Pt载量. 本文通过Pt/C氧还原电极的动力学模型计算,研究了Pt/C电极中的氧分布、生成电流以及满足实际应用的最小Pt载量. 结果表明：燃料电池Pt/C电极,阴极产生严重浓差极化的催化层厚度为40mm;功率密度达到1.4 W•cm^-2（2.1 A•cm^-2@0.67 V）的电池性能需要3mm左右的Pt/C阴极催化层,阴极Pt载量为0.122 mg•cm^-2,即可使膜电极的阴极铂用量低于0.087 g•kW^-1.     

Direct transfer of micro-molded electrodes for enhanced mass transport and water management in PEMFC

Soft lithography technique is used to micropattern the electrodes on the electrolyte membrane of polymer electrolyte fuel cell (PEMFC) in order to alleviate the issues due to poor water management and inadequate reactant distribution in the fuel cell environment. Membrane electrode assembly with the micropatterned electrode has shown an increase in power density at a higher temperature as well as at a higher relative humidity when compared to a flat electrode. Consistency in cell performance is observed in the case of micropatterned electrodes.     

Nanostructured PtVFe catalysts: Electrocatalytic performance in proton exchange membrane fuel cells

This paper reports new findings of an investigation of the electrocatalytic performance of nanostructured PtVFe catalysts in proton exchange membrane fuel cells (PEMFC). The membrane electrode assembly was prepared using nano-engineered PtVFe nanoparticles with controlled composition and size supported on carbon as the cathode electrocatalysts. The results reveal that the PtVFe/C catalysts exhibited excellent fuel cell performance, better than that using the commercial Pt/C catalyst. This finding provides the first example demonstrating the viability of the PEMFC application of the nanostructured trimetallic catalysts.     

高性能质子交换膜燃料电池

用全氟碘酸质子交换膜作为质子交换膜燃料电池（ＰＥＭＦＣ）电解质,简化了水和电解质的管理。本文研究了该燃料电池质子交换膜厚度对电池性能影响;性能最佳的Ｎａｆｉｏｎ１１２膜和低铂载量Ｅ－ＴＥＫ电极组装的ＰＥＭＦＣ,在输出功率高达０．９５Ｗ／ｃｍ＾２;同时考察了电池的能量转换效率、Ｅ－ＴＥＫ电极中铂电催化剂利用率和电池的稳定性。     

A novel reference electrode for application in alkaline polymer electrolyte membrane fuel cells

An in-situ fuel cell reference electrode (RE) consisting of a Pd-coated Pt wire exhibits stable potentials in alkaline polymer electrolyte membrane fuel cells (APEMFC). Results indicate that the overpotential and impedance of the anode are higher than those of the cathode in the cells tested (even at low currents); this is contrary to that found in proton-exchange membrane fuel cells (PEMFC) and it shows that caution is required when translating prior understating of PEMFC to APEMFC. The working hypothesis is that there is flooding-derived mass transport loss at the anode (where water is electro-generated).     

质子交换膜燃料电池零下冷启动研究

在零下启动过程中,质子交换膜燃料电池阴极中氧气还原反应生成的水会在催化剂层内部结冰,因而阻碍氧气传输,覆盖催化剂层反应活性位点,降低电化学活性面积,影响燃料电池发电性能,甚至会导致零下启动失败;同时,结冰/融化循环还会破坏膜电极结构,影响燃料电池寿命。因此,质子交换膜燃料电池零下启动技术的研究对促进燃料电池汽车的推广应用有重要意义。本文针对质子交换膜燃料电池的零下启动过程,从实验研究、机理解释、模型分析及策略开发等角度对文献内容进行了梳理,并对涉及质子交换膜燃料电池零下启动过程的专利技术进行了总结。     

Non-noble metal catalyst for a future Pt free PEMFC

We have investigated the possibility of developing high-performance, cost-effective and durable non-noble Co metal electrocatalyst for PEMFC. In this work we applied electrodeposition process for PEMFC electrode preparation that is very efficient and far simpler than any other investigated method. The fuel cell with electrodeposited Co as anode catalyst has shown satisfying performance level. In determining FC’s operating conditions, subsequent electrochemical impedance and output power measurements were done, which enable the insight into the Co catalyst based anode behavior. Structure analysis of the electrodeposited anode layer was done by means of SEM and EDS technique. Although the Pt catalyst has higher efficiency, its cost performance ratio is significantly lower than for the Co catalyst, thus this investigation gives interesting possibilities in area of stationary fuel cell application.     

自增湿阴极开放式PEMFC的温度调控

温度对自增湿阴极开放式质子交换膜燃料电池（PEMFC）的性能有着重要的影响. 依据自制的常压自增湿型PEMFC及温度控制设备搭建测试平台,测试了燃料电池在不同工作温度下的输出特性曲线-伏安曲线和功率输出曲线. 通过拟合得到了电极过程动力学参数,分析了工作温度影响电池性能的主要原因.