METHOD OF RECOVERING PRECIOUS METAL FROM MEMBRANE-ELECTRODE ASSEMBLY OF FUEL BATTERY

PROBLEM TO BE SOLVED: To provide a method of recovering precious metals which enables recovering precious metals efficiently from a membrane electrode assembly of a fuel battery without occurrence of accidental harmful substances.SOLUTION: A method of recovering precious metals from a membrane electrode assembly of a fuel battery includes an oxidation step of applying an oxidation potential to the membrane electrode assembly in a state where the membrane electrode assembly is immersed in a dissolving solution, and a reduction step of applying a reduction potential to the membrane electrode assembly. The oxidation step and the reduction step are repeated alternately in such a way that a ratio between a time (a) for the application of the reduction potential and a time (b) for the application of the oxidation potential, namely a/b, is 0.1-1.0. 【課題】燃料電池の膜電極接合体から、副次的な有害物質を発生させることなく、効率的に貴金属を回収することが可能な、貴金属の回収方法を提供する。提供する。【解決手段】実施形態の燃料電池の膜電極接合体からの貴金属の回収方法は、膜電極接合体を溶解液に浸漬した状態で、前記膜電極接合体に酸化電位を加える酸化工程と、前記膜電極接合体に還元電位を加える還元工程とを備え、前記還元電位を加える時間（ａ）と前記酸化電位を加える時間（ｂ）との比ａ／ｂが０．１〜１．０となるように前記酸化工程と前記還元工程を交互に繰り返し行う。【選択図】図１