Co3O4 nanocrystals on single-walled carbon nanotubes as a highly efficient oxygen-evolving catalyst

被引：0
作者：
Jian Wu
Yan Xue
Xin Yan
Wensheng Yan
Qingmei Cheng
Yi Xie
机构：
[1] University of Science & Technology of China,Hefei National Laboratory for Physical Sciences at Microscale
[2] University of Science & Technology of China,National Synchrotron Radiation Laboratory
来源：
Nano Research | 2012年 / 5卷
关键词：
Single-walled carbon nanotubes; cobalt oxide; hybrid; oxygen evolution reaction;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The efficient catalytic oxidation of water to dioxygen is envisioned to play an important role in solar fuel production and artificial photosynthetic systems. Despite tremendous efforts, the development of oxygen evolution reaction (OER) catalysts with high activity and low cost under mild conditions remains a great challenge. In this work, we develop a hybrid consisting of Co3O4 nanocrystals supported on single-walled carbon nanotubes (SWNTs) via a simple self-assembly approach. A Co3O4/SWNTs hybrid electrode for the OER exhibits much enhanced catalytic activity as well as superior stability under neutral and alkaline conditions compared with bare Co3O4, which only performs well in alkaline solution. Moreover, the turnover frequency for the OER exhibited by Co3O4/SWNTs in neutral water is higher than for bare Co3O4 catalysts. Synergetic chemical coupling effects between Co3O4 nanocrystals and SWNTs, revealed by the synchrotron X-ray absorption near edge structure (XANES) technique, can be regarded as contributing to the activity, cycling stability and stable operation under neutral conditions. Use of the SWNTs as an immobilization matrix substantially increases the active electrode surface area, enhances the durability of catalysts under neutral conditions and improves the electronic coupling between Co redox-active sites of Co3O4 and the electrode surface. [media not available: see fulltext]
引用
收藏
页码：521 / 530
页数：9
相关论文
共 144 条
[1]  
Armaroli N.(2007)The Future of energy supply: Challenges and opportunities Angew. Chem. Int. Ed. 46 52-66
[2]  
Balzani V.(2010)The mechanism of water oxidation: From electrolysis via homogeneous to biological catalysis ChemCatChem. 2 724-761
[3]  
Dau H.(2009)Molecular catalysts that oxidize water to dioxygen Angew. Chem. Int. Ed. 48 2842-2852
[4]  
Limberg C.(2009)Electrogenerated IrO J. Am. Chem. Soc. 131 15578-15579
[5]  
Reier T.(2010) nanoparticles as dissolved redox catalysts for water oxidation J. Integr. Plant Biol. 52 704-711
[6]  
Risch M.(2010)Structural and mechanistic aspects of Mn-oxo and Co-based compounds in water oxidation catalysis and potential applications in solar fuel production Energy Environ. Sci. 3 1018-1027
[7]  
Roggan S.(2011)Nanostructured cobalt and manganese oxide clusters as efficient water oxidation catalysts Angew. Chem. Int. Ed. 55 7238-7266
[8]  
Strasser P.(2011)Splitting water with cobalt J. Am. Chem. Soc. 133 16742-16745
[9]  
Sala X.(2011)Photochemical synthesis of a water oxidation catalyst based on cobalt nanostructures J. Am. Chem. Soc. 133 11446-11449
[10]  
Romero I.(2010)A Co J. Am. Chem. Soc. 132 13692-13701
12345678910