Ru-Ti-Sn/Ti三元氧化物金属阳极的析氧性能

本文用一般电极性能测试方法考察了Ru-Ti-Sn/Ti三元氧化物涂层阳极的电极寿命和析氧活性。实验表明，与Ru-Ti/Ti、Ru-Ti-Ir/Ti氧化物阳极比较，Ru-Sn-Ti/Ti阳极具有一定的析氧活性和抗氧化作用。     

钛基涂层氧化物析氧阳极材料的研究进展

介绍了钛基涂层氧化物析氧阳极(DSA)的制备方法,包括热分解、磁控溅射、溶胶–凝胶和电沉积等方法。分析了DSA阳极的析氧原理。指出了DSA电极存在的问题及未来的发展趋势。     

酸性介质中长效析氧阳极的研究

开发了一种新型长效析氧阳极,该含铱阳极在有机电解合成化学、海水电解及电极箔生产等领域得到了成功的应用。通过析氧电流曲线、稳态极化曲线、强化考核寿命微观形貌及相结构分析,得出最佳制备工艺:①析氧阳极的活性氧化物应选择贵金属氧化物IrO2,其在涂层中的质量分数为10%～80%;②在活性氧化物中掺杂惰性金属氧化物是延长涂层寿命的可行办法;③氧化涂层的氧化温度在400～600℃;④增加涂层厚度可延长阳极寿命,提高催化活性。     

金属阳极涂层的析氧电位

以金属阳极涂层的析氯电位检测方法为基础，在进行部分改变后，对金属阳极的析氧电位进行检测。在十几个金属阳极生产（修复）单位，实际生产的金属阳极产品抽取的试样中，以对几十个试片的析氧电位检测结果为依据，进行分析讨论，给出了不同涂层的析氧极化情况，析氧电位和的氧析氯电位差的统计情况。同时证明，甘汞电极也可以做为金属阳极涂层析氧电位检测的参比电极。     

含锡锑中间层的析氧阳极的制备及性能研究

从延缓涂层钛阳极基体钝化的角度出发,采用热分解法制备了含SnO2-Sb2O5中间层的钛基铱钽电极.利用扫描电镜、X射线衍射、能谱等方法对Ti/SnO2-Sb2O5/IrO2-Ta2O5阳极表面的形貌,相结构、元素组成和电化学性能进行了分析.结果表明,Ti/SnO2-Sb2O5/IrO2-Ta2O5阳极的使用寿命较Ti/IrO2-Ta2O5阳极有大幅度的提高,并且具有更高的电催化活性.Ti/SnO2-Sb2O5/IrO2-Ta2O5是一种在酸性环境中非常具有前景的析氧阳极.     

电积用析氧阳极的研究进展

从铅阳极合金化、金属基复合阳极和其他新型阳极三方面综述了金属电沉积中析氧阳极材料的研究现状,展望了新型析氧阳极材料的发展趋势。指出新型阳极在降低电耗、推动金属电沉积行业发展方面具有重大意义。     

Mn掺杂NiCo氧化物高效析氧催化剂的研究

采用水热法合成了一种高电化学性能、低成本的NiCo氧化物材料.通过在NiCo氧化物晶体结构中加入Mn,使用XRD、SEM、Mapping、XPS对样品结构和微观形貌进行了表征,对所制备材料的电化学析氧性能进行了测试和分析.结果 表明,Mn-NiCo-0.1 mmol只需要300 mV的低过电位即可实现10 mA·cm-...     

复合氧化物La0.8Sr0.2CoO3的合成及其析氧电催化

通过有机酸辅助法在较低温度下合成了La0.8Sr0.2CoO3复合氧化物,XRD结果表明,用该方法合成的La0.8Sr0.2CoO3具有单相钙钛矿结构,从稳态物化曲线得出,在碱性溶液中,在La0.8Sr0.2CoO3表面的析氧Tafel斜率为65mV/dec,OH-的反应级数为1,在分析了反应机理后,得出了析氧反应的动力学方程,恒电流测试结果表明,用该方法制备的La0.8Sr0.2CoO3/Ni电极,在碱性溶液中具有良好的析氧催化活性.     

Ni-Cr-Co氧化物纳米催化剂对甲醇阳极氧化的电催化性能研究

采用了热分解法合成Ni-Cr-Co氧化物纳米粒子,并用作直接甲醇燃料电池(DMFC)的阳极电催化剂。通过X射线衍射(XRD)、透射电子显微镜(TEM)和扫描电子显微镜(SEM)对催化剂进行表征,制得的纳米催化剂均匀分散,且粒径为25~50 nm。利用循环伏安法(CV)对不同金属摩尔比和焙烧温度下的催化剂在甲醇氧化反应中的活性进行了研究。结果表明,Ni-Cr-Co(摩尔比为1∶1∶1.5)的纳米氧化物对甲醇氧化反应的起始电位、峰值氧化电流密度和If/Ib分别为0.38 V,19.3 mA/cm2和1.72,表现了很好的电催化性能。     

IrTa氧化物涂层钛阳极恶化原因分析

IrTa氧化物涂层钛阳极是公认的优良析氧尺寸稳定阳极。分析其恶化原因,有基体金属钝化、涂层损耗、涂层剥落、机械损坏及各种综合因素,采取防钝化措施,取得成效。     

Ni-Fe bimetallic anode as an active anode for intermediate temperature SOFC using LaGaO3 based electrolyte film

Effects of additives to Ni anode were studied and it was found that the anodic overpotential can be suppressed by addition of Fe. La_0.9Sr_0.1Ga_0.8Mg_0.2O₃ (LSGM) film was deposited on the dense anode substrate consisting of NiO(Fe₃O₄)-Sm doped CeO₂. After in-situ reduction of NiO and Fe₃O₄ in the dense substrate, the substrate turned to be porous, however, change in size was not large by mixing with SDC. As a result, LSGM dense film with few micrometer thickness was successfully obtained on the porous Ni based anode substrate. By optimizing the thickness of the LSGM film and application of SDC interlayer, the high power density of SOFC single cell using LSGM/SDC bi-layer film as electrolyte at decreased temperature was fabricated and the electrical power generating property was measured as a function of temperature. The high maximum power density could be achieved to a value of 2 W/cm² at 873 K. Even at 673 K, the maximum power density of ca. 80 mW/cm² is exhibited and this high power density was a result of the low electrolyte resistance and the small anodic overpotential of Ni-Fe bimetallic anode.     

固体氧化物燃料电池阳极材料的抗积炭方法

传统的固体氧化物燃料电池(SOFC)阳极采用镍基金属陶瓷材料,在CH4等碳氢化合物为燃料的阳极反应中,会出现积炭。分析以碳氢化合物为燃料的SOFC阳极材料的积炭机理,阐述反应温度、水蒸汽等因素对阳极积炭的影响,介绍Ni基陶瓷阳极性能优化和解决积炭的方法,对SOFC其他阳极材料以及未来阳极材料的发展方向进行研究展望。     

Impact of drying conditions and wet film properties on adhesion and film solidification of lithium-ion battery anodes

Electrodes constitute a vital component of lithium-ion battery cells. The property-determining, porous microstructure of anodes, which is composed of micrometer-sized graphite particles and nanoscale additives, was developed during convective removal of the solvent. In the present work, the impact of significant drying conditions and wet film properties, such as drying rate, slurry composition or active material particle size, just to name a few, is examined to provide further understanding of film solidification. The influence on both adhesion and film solidification is investigated. Subsequently, a previously developed film solidification mechanism will be critically reviewed based on findings.     

Study of copper foam-supported Sn thin film as a high-capacity anode for lithium-ion batteries

Three-dimensional porous Sn thin film electrodes were prepared by electroless deposition on copper foam, then its morphology and electrochemical property were studied by means of scanning electron microscope (SEM), X-ray diffraction (XRD), electrochemical cycling test and cyclic voltammetry (CV). The porous framework and micro-holes have shown a great structure advantage in restricting severe volume changes when the Sn thin film was employed as anode for lithium-ion battery. The film electrode of sample C with an initial capacity of 676 mAh g⁻¹ showed good cycle performance displayed by retaining a capacity of 313 mAh g⁻¹ after 100 cycles.     

金属阳极修复技术与应用

提出了我国金属阳极修复产业的现状及存在问题。根据试验数据提出了修复工艺的选择、去除旧涂层的方法、重涂工艺及涂层配方、加强生产现场质量检测、控制等方面的改进意见及应用于各种钛阳极的修复再生。     

纳米氧化物与染土协同抗紫外性能研究

通过研究不同纳米氧化物/染土体系、不同晶型纳米二氧化钛/染土体系以及不同比例的锐钛矿型纳米二氧化钛/染土体系等在紫外-可见光区的透射率,找到具有优异抗紫外性能的纳米氧化物/染土体系,以提高蔺草染土固色质量及保色效果。实验结果表明,添加具有抗紫外性能的纳米氧化物均有利于提高染泥的固色效果;在不同纳米氧化物与染土比例一定情况下,锐钛矿型二氧化钛/染土体系的透过率最低,抗紫外性能最好;无论是对于锐钛矿型纳米二氧化钛/染土体系,还是锐钛矿和金红石型两种晶型的纳米二氧化钛与染土的混合体系,随着体系中纳米二氧化钛含量的减少,体系的抗紫外性能降低;在纳米二氧化钛与染土比例一定情况下,不同晶型的纳米二氧化钛在不同波段的抗紫外性能也有所不同。     

热收缩聚酯薄膜的研制

在聚酯中添加改性单体后,分子链空间位阻增大,共聚酯的结晶能力下降,热收缩性得以提高。并研究了以此共聚酯为原料,采用间歇干燥、单向拉伸、常温冷却、松弛定型的成膜工艺。     

Patterned Si thin film electrodes for enhancing structural stability

A patterned film (electrode) with lozenge-shaped Si tiles could be successfully fabricated by masking with an expanded metal foil during film deposition. Its electrochemical properties and structural stability during the charge-discharge process were examined and compared with those of a continuous (conventional) film electrode. The patterned electrode exhibited a remarkably improved cycleability (75% capacity retention after 120 cycles) and an enhanced structural stability compared to the continuous electrode. The good electrochemical performance of the patterned electrode was attributed to the space between Si tiles that acted as a buffer against the volume change of the Si electrode.     

Microstructure and electrochemical properties of electron-beam deposited Sn-Cu thin film anodes for thin film lithium ion batteries

Thin film Sn-Cu anodes with high Cu content were prepared by electron-beam evaporation deposition using Cu substrate as current collector. Annealing, with the condition being determined by DSC, was used to improve the performance of these electrodes. X-ray diffraction (XRD), scanning probe microscopy (SPM), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) were used to characterize the structure and composition of the Sn-Cu thin film electrodes. Cyclic voltammetry and galvanostatical charge-discharge measurement were carried out to characterize the electrochemical properties of the as-deposited and annealed electrodes. ?-Cu₃Sn intermetallic phase was formed and interface strength between deposited active materials layer and current collector was enhanced by annealing the as-deposited film under suitable condition. The annealed thin film electrode showed good cycleability and had no phase change during cycling. Although large initial capacity loss was found associated with SEI formation due to increase of surface roughness of annealed electrode, a stable discharge capacity near 300 mAh/g with Coulomb efficiency of about 96% was obtained at voltage window of 0.1-2.0 V and a discharge capacity of about 200 mAh/g and Coulomb efficiency of 97% were kept stable up to 30th cycle at a narrower voltage window of 0.2-1.5 V versus Li/Li⁺.     

Preparation and characterization of three-dimensional tin thin-film anode with good cycle performance

Three-dimensional tin thin-film anode was prepared by electroless plating tin onto three-dimensional (3D) copper foam (which served as current collector), and characterized physically by SEM, EDS and XRD. Its electrochemical property and mechanism were studied by charge-discharge test, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The SEM and EDS results indicated that tin film with 500 nm thickness was formed over the whole surface of copper branches. The XRD results suggested that a new phase of Cu₆Sn₅ was formed between copper and tin. Besides the tin microflake structure of 500 nm thickness, the interaction effects of the copper foam and Cu₆Sn₅ phase formed between copper and tin resulted in good cycle performance with first discharge capacity of 737 mAh g⁻¹, 97% capacity retention after 20 cycles and still 84% after 40 cycles.