Shape-controlled synthesis of Ag@TiO2 cage-bell hybrid structure with enhanced photocatalytic activity and superior lithium storage

Literature Information

Publication Date 2013-08-14
DOI 10.1039/C3GC41280F
Impact Factor 10.182
Authors

Wei Wang, Lixiang Liu, Yunbo He, Cuiping Li, Yapeng Wang


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Abstract

Cage-bell hybrid Ag-modified TiO2 nanoparticle aggregates are fabricated through an environmental template-free route and subsequent facile impregnation method. The intrinsic hollow core–shell microstructure makes multiple reflections of light within the chamber, allowing more efficient use of a light source compared with solid structures. This structure can also shorten the lengths for both electronic and ionic transport, enlarge the surface areas of electrodes, and the improve accommodation of the volume change during Li insertion/extraction cycling. Furthermore, the introduction of Ag is beneficial for the enhancement of the interfacial charge transfer efficiency to adsorbed substrates and for the improvement of its high-rate discharge capacity. Therefore, Ag@TiO2 exhibits remarkable photocatalytic activity under visible light and improved performance as an anode material for lithium ion batteries. This strategy is simple, cheap and amenable to mass-production, which may shed light on a new avenue for large-scale synthesis of cage-bell structural nanofunctional materials for catalysis, energy storage and other applications.

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Green Chemistry provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on, but not limited to, the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998). Green chemistry is the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry is at the frontiers of this continuously-evolving interdisciplinary science and publishes research that attempts to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. Submissions on all aspects of research relating to the endeavour are welcome. The journal publishes original and significant cutting-edge research that is likely to be of wide general appeal. To be published, work must present a significant advance in green chemistry. Papers must contain a comparison with existing methods and demonstrate advantages over those methods before publication can be considered. For more information please see this Editorial. Coverage includes the following, but is not limited to: Design (e.g. biomimicry, design for degradation/recycling/reduced toxicity…) Reagents & Feedstocks (e.g. renewables, CO2, solvents, auxiliary agents, waste utilization…) Synthesis (e.g. organic, inorganic, synthetic biology…) Catalysis (e.g. homogeneous, heterogeneous, enzyme, whole cell…) Process (e.g. process design, intensification, separations, recycling, efficiency…) Energy (e.g. renewable energy, fuels, photovoltaics, fuel cells, energy storage, energy carriers…) Applications (e.g. electronics, dyes, consumer products, coatings, pharmaceuticals, preservatives, building materials, chemicals for industry/agriculture/mining…) Impact (e.g. safety, metrics, LCA, sustainability, (eco)toxicology…) Green chemistry is, by definition, a continuously-evolving frontier. Therefore, the inclusion of a particular material or technology does not, of itself, guarantee that a paper is suitable for the journal. To be suitable, the novel advance should have the potential for reduced environmental impact relative to the state of the art. Green Chemistry does not normally deal with research associated with 'end-of-pipe' or remediation issues.

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