NOVELTY - Fabricating a catalyst composition, comprises: (a) mixing a catalyst carrier and a reducing agent to form a solution; (b) adding a palladium precursor and a second metal precursor into the solution to perform a reduction reaction, thus to deposit palladium and a second metal on the surface of the catalyst carrier; and (c) performing a first heat treatment on the catalyst carrier with the palladium and the second metal deposited on it, and performing a second heat treatment in the presence of a reducing gas to form a metal solid solution on the surface of the catalyst carrier.    USE - The catalyst composition is useful in an anode of a fuel cell, which is a formic acid fuel cell (all claimed). The fuel cell is useful: in various applications such as electrical power supplies, and in vehicles as power supplies in replacement of internal combustion engines; as portable electrical power supplies for video cameras, computers, personal digital assistant or portable telephones.    ADVANTAGE - The catalyst composition exhibits excellent catalytic characteristics and higher stability. The catalyst composition enhances the electrochemical properties and stability of the fuel cell.    DETAILED DESCRIPTION - Fabricating a catalyst composition, comprises: (a) mixing a catalyst carrier and a reducing agent to form a solution; (b) adding a palladium precursor and a second metal precursor into the solution to perform a reduction reaction, thus to deposit palladium and a second metal on the surface of the catalyst carrier, where the second metal comprises gold, platinum, ruthenium, nickel, silver and manganese; and (c) performing a first heat treatment on the catalyst carrier with the palladium and the second metal deposited on it, and performing a second heat treatment in the presence of a reducing gas to form a metal solid solution on the surface of the catalyst carrier, where the metal solid solution includes the palladium and the second metal. INDEPENDENT CLAIMS are included for:    (1) a catalyst composition, comprising: a catalyst carrier, and a metal solid solution, disposed on the surface of the catalyst carrier, where the metal solid solution includes palladium and the second metal; and    (2) a fuel cell, comprising: an anode (11) including the catalyst composition, a cathode (12), and an electrolyte membrane (13), disposed between the anode and the cathode.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a formic acid fuel cell.    Anode (11)    Cathode (12)    Electrolyte membrane. (13)