• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International journal of hydrogen energy >Synthesis and physical-chemical characterization of nanocrystalline Ta modified TiO2 as potential support of electrocatalysts for fuel cells and electrolyzers
【24h】

Synthesis and physical-chemical characterization of nanocrystalline Ta modified TiO2 as potential support of electrocatalysts for fuel cells and electrolyzers

机译：纳米晶Ta修饰的TiO2的合成及其物理化学性质，可作为燃料电池和电解槽用电催化剂的潜在载体

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This work was focused on the synthesis of tantalum (Ta) modified TiO2 mixed oxides and their structural and surface properties characterization using XRD, XPS, BET and H-2-TPR techniques. Ta-modified TiO2 samples were synthesized using a sol-gel procedure and evaluated for potential application as electrocatalysts support. The tantalum (Ta) modified TiO2 mixed oxides showed a unimodal nanoporous structure with pore sizes ranging from 3 nm to 5 nm. Concomitant with their higher surface area and pore volume, the mixed oxides were nanocrystalline and significantly smaller than Ti and Ta single oxides prepared by the same method (7-8 nm). A dominant anatase phase was detected by XRD at low calcination temperature, while the crystallographic structure becomes ruffle when the sample was treated at 850 degrees C. By incorporating Ta into TiO2, the lattice parameters were changed, the reducibility of mixed oxides was increased and the surface oxygen deficiency was significantly enhanced as well. The present study clearly established that the structural (crystal phase, crystal size, nanoporosity, pore size) and surface properties (reducibility, oxygen deficiency, acidity, oxidation activity) of the Ta-modified TiO2 mixed oxides can be tailored by modifying the sol-gel procedure and the thermal treatment. A palladium catalyst supported on this oxide (30% Pd/TaTiOx) was prepared by the sulphite complex route. The catalyst was ex-situ characterized by physico-chemical analysis and investigated for the ORR to evaluate its activity, stability and durability. The Pd/TaTiO. catalyst, compared with catalysts from literature, showed a very promising stability, figuring good perspectives for application in fuel cells and/or electrolyzers. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
机译：这项工作的重点是使用XRD，XPS，BET和H-2-TPR技术合成钽（Ta）修饰的TiO2混合氧化物及其结构和表面特性。使用溶胶-凝胶法合成了Ta改性的TiO2样品，并评估了其作为电催化剂载体的潜在应用。钽（Ta）改性的TiO2混合氧化物显示出单峰纳米孔结构，孔径范围为3 nm至5 nm。伴随其较高的表面积和孔体积，混合氧化物是纳米晶体，并且比通过相同方法（7-8 nm）制备的Ti和Ta单氧化物明显小。在较低的煅烧温度下通过XRD检测到显着的锐钛矿相，当在850℃下处理样品时晶体结构变得皱纹。通过将Ta掺入TiO2中，改变了晶格参数，提高了混合氧化物的可还原性，并且表面氧缺乏也显着增强。本研究清楚地确定，可以通过改性溶胶-溶胶来定制Ta修饰的TiO2混合氧化物的结构（晶相，晶体尺寸，纳米孔隙度，孔径）和表面性质（还原性，氧不足，酸度，氧化活性）。凝胶程序和热处理。通过亚硫酸盐配合物路线制备了负载在该氧化物上的钯催化剂（30％Pd / TaTiOx）。通过理化分析对该催化剂进行了异位表征，并对其ORR进行了研究，以评估其活性，稳定性和耐久性。 Pd / TaTiO。与文献中的催化剂相比，该催化剂显示出非常有希望的稳定性，为在燃料电池和/或电解槽中的应用打下了良好的前景。 （C）2017氢能出版物有限公司。由Elsevier Ltd.出版。保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号