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Controlled Synthesis of Transition Metal Oxide Mesocrystals on Graphene Oxide and the Application in Electrocatalysis

氧化石墨烯上过渡金属氧化物介晶的可控合成及其在电催化中的应用

基本信息

批准号：
337373595
负责人：
Professor Dr. Helmut Cölfen (†)
金额：
--
依托单位：
Ocean University of China
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2017
资助国家：
德国
起止时间：
2016-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/337373595?language=en
关键词：
Controlled Synthesis Transition Metal Oxide

项目摘要

The oxygen reduction reaction (ORR), the cathodic branch of oxygen electrode reactions with sluggish kinetics, is considered as one of the limiting factors for the application of electrochemical energy conversion and storage such as metal-air batteries and fuel cells. The scarcity and high cost of Pt are impeding their mass commercialization, and searching for efficient and cheap non-precious-metal catalysts is preferable. Transition metal oxide/carbon composites exhibit intrinsic activity for ORR. Even so, compared with Pt, these reported materials show dwarfed activity and durability. Mesocrystals, constructed by crystallographically oriented nanocrystals, can be regarded as a new class of superstructured materials with an available ordered superstructure, which was first proposed by Prof. Helmut Cölfen (German applicant). Due to the advantages of mesocrystals with high porosity and exposition of high energy crystal faces, they have attracted a great deal of research interest in energy-related applications. The Chinese applicant (Associated Prof. Minghua Huang) is leading a research group to fabricate transition metal oxide-based catalysts and to study their electrocatalytic activity for ORR. Her team has developed a series of hollow carbon sphere/metal oxide nanomaterials with high activity and good stability. The German applicant (Prof. Helmut Cölfen) and his group have a long and distinguished background on the inorganic and organic components in bio- and bioinspired mineralization as well as on investigating growth mechanisms and structure characterization of various mesocrystals. In 2007-2008, the Chinese applicant was a Humboldt Fellow in the group of Prof. Helmut Cölfen. The bioinspired mineralization principle of polymer-coded nanoparticle organization has been transferred to induce the self-assembly of an aromatic molecule. In this project, they will focus on the controlled growth of transition metal oxide mesocrystals on graphene oxide sheets and investigation of the ORR catalytic activity of the final metal oxide mesocrystal-graphene catalysts, especially on clarifying the growth mechanism and providing thorough investigation of the relationship between the catalyst structures and the activities.

氧还原反应（ORR）是氧电极反应的阴极分支，动力学缓慢，被认为是金属-空气电池和燃料电池等电化学能量转换和存储应用的限制因素之一。铂的稀缺性和高成本阻碍了其大规模商业化，寻找高效、廉价的非贵金属催化剂是首选。过渡金属氧化物/碳复合材料表现出固有的ORR活性。即便如此，与铂相比，这些材料的活性和耐用性都相形见绌。介晶是由晶体取向的纳米晶体构建而成的一类具有有序超结构的新型超结构材料，最早由Helmut教授Cölfen（德国申请人）提出。由于介晶具有高孔隙率和高能量晶面的优点，在能源相关应用中引起了广泛的研究兴趣。中国申请人（黄明华副教授）正在领导一个研究小组制备过渡金属氧化物基催化剂，并研究其对ORR的电催化活性。她的团队开发了一系列具有高活性和良好稳定性的空心碳球/金属氧化物纳米材料。德国申请人（Helmut教授Cölfen）和他的团队在生物和生物激发矿化中的无机和有机成分以及研究各种介晶的生长机制和结构特征方面有着长期而杰出的背景。2007-2008年，中国申请人是Helmut教授Cölfen小组的洪堡研究员。聚合物编码纳米颗粒组织的生物启发矿化原理已被转移到诱导芳香分子的自组装。在本项目中，他们将重点研究过渡金属氧化物介晶在氧化石墨烯片上的可控生长，研究最终金属氧化物介晶-石墨烯催化剂的ORR催化活性，特别是阐明生长机制，并深入研究催化剂结构与活性之间的关系。