NOVELTY - A copper, silver or lead-nanoporous gold-platinum article is removed from ion solution, and monoatomic layer or lower layer of copper, silver, or lead is replaced with gold ions by immersing the article in a gold ion solution, to form nanoporous gold-platinum-gold article. An electrode and a nanoporous gold-platinum-gold article are cleaned. The process such as removing, replacing and cleaning involved in forming nanoporous gold-platinum-gold article are repeated to increase the loading of gold on the nanoporous gold-platinum-gold article/catalyst to a pre-determined level.    USE - Preparation of catalyst (claimed) used for direct formic acid fuel cell, proton exchange membrane fuel cell and direct methanol fuel cell.    ADVANTAGE - The method provides catalyst having excellent stability, toxic resistance and durability, with reduced usage of platinum.    DETAILED DESCRIPTION - A gold-silver alloy article comprising (in weight%) gold (10-60) and silver (40-90) and having length of 0.1-1000 cm, width of 0.1-100 cm, and thickness of 0.01-1000 mu m is provided. The silver is removed from the gold-silver alloy article by immersing the gold-silver alloy article in a de-alloying solution comprising nitric acid (0.1-70) at 0-50 degrees C for 1 second-100 minutes, to form a nanoporous gold (NPG) article having nanopores. The surface of the nanoporous gold article is cleaned, and the de-alloying solution is removed from the nanopores using deionized water. An electrode is attached to the nanoporous gold article, and a monoatomic layer or lower layer of copper, silver, or lead, is deposited on the surface of and within the nanopores of the nanoporous gold article through the use of cyclic voltammetry (CV) method or potentiostatic method by immersing the nanoporous gold article in an ion solution comprising 1 mu mol/dm3-10 mol/dm3 of copper, silver, or lead ion, to form copper, silver or lead-nanoporous gold article. Then, the copper, silver or lead-nanoporous gold article is removed from the ion solution, and the monoatomic layer or lower layer of copper, silver, or lead is replaced with platinum ions by immersing the copper, silver or lead-nanoporous gold article in a platinum ion solution comprising 1 mu mol/dm3-10 mol/dm3 of platinum ion for 1 minute-100 hours, to form an nanoporous gold-platinum article. The electrode, and the nanoporous gold article-platinum article are cleaned using deionized water. The process such as attaching, depositing, removing, replacing and cleaning involved in forming nanoporous gold-platinum article are repeated to increase the loading of platinum on the nanoporous gold-platinum article to a pre-determined level. The monoatomic layer or lower layer of copper, silver, or lead, is deposited on the surface of and within the nanopores of nanoporous gold-platinum article through the use of cyclic voltammetry (CV) method or potentiostatic method by immersing the nanoporous gold article-platinum article in an ion solution comprising 1 mu mol/dm3-10 mol/dm3 of copper, silver, or lead ion, to form copper, silver or lead- nanoporous gold-platinum article. Then, copper, silver or lead-nanoporous gold-platinum article is removed from the ion solution, and the monoatomic layer or lower layer of copper, silver, or lead is replaced with gold ions by immersing the copper, silver or lead-nanoporous gold-platinum article in a gold ion solution comprising 1 mu mol/dm3-10 mol/dm3 of gold ion for 1 minute-100 hours to form nanoporous gold-platinum-gold article. The electrode and nanoporous gold-platinum-gold article are cleaned using deionized water. The process such as depositing, removing, replacing and cleaning involved in forming nanoporous gold-platinum-gold article are repeated to increase the loading of gold on the nanoporous gold-platinum-gold article/catalyst to a pre-determined level.