tailieunhanh - Báo cáo hóa học: " Facile Hydrogen Evolution Reaction on WO3 Nanorods Janarthanan Rajeswari Æ Pilli Satyananda Kishore Æ Balasubramanian Viswanathan Æ Thirukkallam Kanthadai Varadarajan"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Facile Hydrogen Evolution Reaction on WO3 Nanorods Janarthanan Rajeswari Æ Pilli Satyananda Kishore Æ Balasubramanian Viswanathan Æ Thirukkallam Kanthadai Varadarajan | Nanoscale Res Lett 2007 2 496-503 DOI s11671-007-9088-y NANO EXPRESS Facile Hydrogen Evolution Reaction on WO3 Nanorods Janarthanan Rajeswari Pilli Satyananda Kishore Balasubramanian Viswanathan Thirukkallam Kanthadai Varadarajan Received 13 April 2007 Accepted 10 August 2007 Published online 1 September 2007 to the authors 2007 Abstract Tungsten trioxide nanorods have been generated by the thermal decomposition 450 C of tetrabutylammonium decatungstate. The synthesized tungsten trioxide WO3 nanorods have been characterized by XRD Raman SEM TEM HRTEM and cyclic voltammetry. High resolution transmission electron microscopy and X-ray diffraction analysis showed that the synthesized WO3 nanorods are crystalline in nature with monoclinic structure. The electrochemical experiments showed that they constitute a better electrocatalytic system for hydrogen evolution reaction in acid medium compared to their bulk counterpart. Keywords Tungsten trioxides Thermal decomposition Nanorods Hydrogen evolution reaction Electrocatalyst Introduction One-dimensional 1D nanostructures such as nanorods nanowires and nanotubes have attracted attention due to their novel physical and chemical properties as well as their potential use in a wide range of advanced applications in the past decade 1 2 . As a consequence many synthetic methods have been developed to prepare various 1D nanostructures 3-6 . Of particular interest is the preparation of 1D nanostructure of tungsten trioxides WO3 and its suboxides WO3 - x . WO3 is used extensively as J. Rajeswari P. S. Kishore B. Viswanathan El T. K. Varadarajan Department of Chemistry National Centre for Catalysis Research Indian Institute of Technology Madras Chennai 600 036 India e-mail bvnathan@ materials for electrochromic devices 7-10 gas sensors 11 12 catalysts 13 14 and secondary batteries 15 . Several synthetic approaches including electrochemical techniques sonochemical approach template mediated synthesis bioligation .