U.S.-Polish Collaborative Research on Electroanalytical Chemistry in the Absence of a Bulk Solution Phase

美国-波兰在没有本体溶液相的情况下进行电分析化学合作研究

• 批准号: 9529589
• 负责人: James Cox
• 金额: $ 3.92万
• 依托单位: Miami University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-02-01 至 2000-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9529589&HistoricalAwards=false
• 关键词: U.S.; Polish; Collaborative; Research; Electroanalytical

9529589 Cox This U.S.-Polish Cooperative Research award will study "Electroanalytical Chemistry in the Absence of a Bulk Solution Phase." The principal researchers are Dr. James A. Cox of Miami University, Ohio, and Dr. Pawel J. Kulesza of the University of Warsaw. The general goal of this program is to characterize certain ionically-conducting solids in terms of their ability to serve as media for electrochemical studies in the absence of a contacting solution phase. Of particular interest would be to establish conditions where electrolyses of gas-phase components can be performed at cells using these electrolytes under conditions where the rates and mechanisms of the electrode reaction are not influenced by concomitants in the gas phase. The components of interest in this study are generally electrochemically silent at conventional, bare electrodes, so the investigation of catalysis in the environment of these solids is a required part of this program. The researchers will investigate two general materials as solid electrolytes, glassy substances prepared by sol-gel processes and polyoxometallate powders. The former will be xerogels with known or predicted ionic conductivity such as polymeric vanadium, ruthenium, and iridium oxides. The catalysts will be in the form of surface layers on electrodes coated with films of the xerogels or dispersions with these films. In addition, conversion of selected xerogels into redox mediators by electrochemically generating lower oxides of the metal centers will be explored. Keggin-type heteropoly-12-tungstates will comprise the primary polyoxometallates investigated. The test systems will be selected on the basis of formation of mixed-valent systems. The kinetics of electron self-exchange will be determined along with the effective transport coefficient. Once characterized, the polyoxometallates will be encapsulated in xerogels. Here, the objective is to exploit the catalytic activity of the former in an envi ronment that permits the selected redox reaction to proceed without interference from other components, including water, of the surrounding atmosphere. The studies will be performed with conventional electrochemical instrumentation, including voltammetric and a.c. impedance methodology. The results of this investigation will guide the development of amperometric sensors for hazardous components in air and for the presence of targeted solids or liquids with finite vapor pressures. In addition, these electrochemical systems are projected to be suited to purifying the atmosphere of small environments. Other possible applications include the design of energy-storage devices and microscale electronic components such as bilayer switches. This research in chemistry fulfills the program objectives of bringing together leading experts in the U.S. and Poland to combine complementary efforts and capabilities in areas of strong mutual interest and competence on the basis of equality, reciprocity, and mutuality of benefit.

9529589 COX该美国 - 派别合作研究奖将研究“在没有批量解决方案阶段的情况下进行电分析化学”。 首席研究人员是俄亥俄州迈阿密大学的James A. Cox博士和华沙大学的Pawel J. Kulesza博士。 该程序的一般目标是在没有接触溶液阶段的情况下作为电化学研究的培养基的能力来表征某些离子传统固体的能力。 特别令人感兴趣的是建立条件，即在电极反应的速率和机制不受气相中伴随的影响的条件下，可以在细胞上使用这些电解质在细胞上进行电气层的电解质。 这项研究中感兴趣的组成部分通常在传统的裸露电极上进行电化学沉默，因此在这些固体环境中对催化的研究是该程序的必需部分。 研究人员将研究两种通用材料，作为固体电解质，通过溶胶 - 凝胶过程制备的玻璃质物质和多氧粉末。 前者将是具有已知或预测的离子电导率（例如聚合物钒，氟苯菌和氧化物）的切凝胶。 这些催化剂将以表面层的形式，上面涂有叶凝胶膜或与这些薄膜分散的电极。 此外，将探索通过电化学产生金属中心的较低氧化物将选定的切凝胶转化为氧化还原介质。 Keggin型Heteropoly-12-Tungstates将构成所研究的主要多氧元。 将根据形成混合价系统选择测试系统。 电子自我交换的动力学将与有效的运输系数一起确定。 一旦表征，多氧金属分析物将封装在Xerogels中。 在这里，目的是在环境中利用前者的催化活性，该催化活性允许所选的氧化还原反应在不受周围大气的其他成分（包括水）干扰的情况下进行。 这些研究将使用传统的电化学仪器进行，包括伏安法和A.C.阻抗方法。 这项研究的结果将指导空气中有害成分的安培传感器的开发以及有限蒸气压的靶向固体或液体的存在。 此外，这些电化学系统预计适合净化小环境的气氛。 其他可能的应用包括能量存储设备和微观电子组件（例如双层开关）的设计。 这项化学研究实现了将美国和波兰领先的专家汇集在一起​​的计划目标，以将互补的努力和能力相结合，以在浓厚的共同利益和能力的领域中，基于平等，互惠和利益共同性。