A summary of practical fuel cell technology to 1963

A survey is made of three types of primary fuel cell systems now in battery engineering phases. The three cell types are: 1) those using aqueous electrolytes; 2) those using molten electrolytes; and 3) those with solid electrolytes. Ten aqueous-electrolyte cell systems, six molten-electrolyte cell systems, and three solid-electrolyte cell systems are reviewed. Seventy-eight references are cited.