• UTTAM GUPTA

      Articles written in Bulletin of Materials Science

    • Visible-light-induced hydrogen evolution reaction with WS$_x$Se$_{2−x}$

      UTTAM GUPTA DEEPA S NARANG

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      WS$_2$ is a promising catalyst for the hydrogen evolution reaction.We have explored photocatalytic properties of ternary sulphoselenides of tungsten (WS$_x$Se$_{2−x}$) by the dye-sensitized hydrogen evolution.WSxSe2−x solidsolutions are found to exhibit high activity reaching 2339 $\mu$mol h$^{−1}$ g$^{−1}$ for WSSe, which is three times higher than that of WS2 alone (866 $\mu$mol h$^{−1}$ g$^{−1}$). The turnover frequency is also high (0.7 h$^{−1}$). Such synergistic effect of selenium substitution in WS2 is noteworthy.

    • Synthesis and properties of graphene and its 2D inorganic analogues with potential applications

      UTTAM GUPTA K GOPALAKRISHNAN C N R RAO

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      Discovery of the amazing properties of graphene has aroused great interest in other 2D materials. 2D inorganic analogues of graphene such as the transition metal dichalcogenides have been investigated widely and these materials,especially MoS$_2$, exhibit many properties of interest. In particular, they possess properties of direct use in energy devices. In this article we review the synthesis and properties of the 2D materials of relevant transistors, sensors, photodetectors, supercapacitors and batteries as well as in oxygen reduction and hydrogen evolution reactions.

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