Electrochemical reduction of high-pressure carbon dioxide with an indium, a fin, and a lead electrode at a potential of -1.8 V versus Ag/AgCl saturated KCI was investigated in the range of 20-100 degrees C. Under optimum experimental conditions, with the indium electrode, about 100% Faraday efficiency formic acid was selectively obtained at 20-60 degrees C, and at 100 degrees C the formation efficiency was 44.5%. With the tin electrode, 99.2% Faraday efficiency formic acid was obtained at 20 degrees C. With increasing temperature, the Faraday efficiency of formic acid decreased and that of hydrogen increased. In the case of the lead electrode, Faraday efficiencies of formic acid and hydrogen were both about 50% at 20 degrees C. A maximum Faraday efficiency of formic acid (91.2%) was obtained at 60 degrees C. Hydrogen formation was lowest at that temperature. For the electrodes, the formation of carbon monoxide was minimal at the temperatures tested.