NOVELTY - Chemovoltaic cell (102) comprises a catalyst metal layer attached to a semiconductor layer. A junction between the catalyst metal layer and the semiconductor layer provides a Schottky contact. A metallic layer (112) is attached to the semiconductor layer to provide an Ohmic contact. The catalyst metal layer catalyzes a chemical reaction (104) on a surface (106) of the catalyst metal layer to generate a chemical energy. A combination of the catalyst metal layer, the semiconductor layer and the metallic layer converts the chemical energy into an electrical energy.    USE - Chemovoltaic cell for converting a chemical energy to an electrical energy and for use in chemoelectrical power generator (claimed).    ADVANTAGE - The energy efficient chemovoltaic cell includes a metal-semiconductor nanostructure, which is energized by an in situ exothermic chemical reaction. The chemoelectrical power generator containing the cell provides significantly higher quantum efficiency when compared to similarly configured thermionic power generators, where current is thermally induced by externally supplied heat.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) chemovoltaic battery comprising a chamber having a gas inlet and a gas outlet, and chemovoltaic cells arranged in the chamber; and    (2) chemoelectrical power generator (100) comprising an n-type chemovoltaic cell including a first catalyst metal layer and a first metal layer on an n-type semiconductor layer, a p-type chemovoltaic cell including a second catalyst metal layer and a second metal layer on a p-type semiconductor layer, and a junction connecting the n-type chemovoltaic cell and p-type chemovoltaic cell.    A combination of the n-type chemovoltaic cell and the p-type chemovoltaic cell converts the chemical energy into an electrical energy.    DESCRIPTION OF DRAWING(S) - The drawing is a perspective and an exploded partial schematic view of a chemoelectrical power generator.    Generator (100)    Chemovoltaic cell (102)    Chemical reaction (104)    Metallic layer (112)    Schottky barrier (116)