Anode for electrolysis and preparation method thereof
Provided are an anode for electrolysis, which includes a metal base, and a catalyst layer disposed on at least one surface of the metal base, wherein the catalyst layer includes a composite metal oxide of ruthenium, iridium, titanium, and platinum, and a metal in the composite metal oxide does not include palladium, wherein, when the catalyst layer is equally divided into a plurality of pixels, a standard deviation of iridium compositions of the plurality of equally divided pixels is 0.40 or less, and a method of preparing the same.
1. An anode for electrolysis, the anode comprising:
a metal base; and
a catalyst layer disposed on at least one surface of the metal base,
wherein:
the catalyst layer comprises a composite metal oxide of ruthenium, iridium, titanium, and platinum;
the catalyst layer does not include palladium as a metal component;
the anode does not include palladium; and
a standard deviation of iridium compositions of a plurality of equally divided pixels of the catalyst layer is 0.4 or less.
2. The anode of claim 1 , wherein the standard deviation of iridium compositions is 0.30 or less.
3. The anode of claim 1 , wherein a standard deviation value of the iridium compositions with respect to a mean value of the iridium compositions of the plurality of divided pixels (standard deviation/mean) is in a range of 0.05 to 0.15.
4. The anode of claim 1 , wherein the catalyst layer comprises 7.0 g or more of ruthenium per unit area (m 2 ) of the catalyst layer.
5. The anode of claim 1 , wherein the composite metal oxide comprises a total amount of the ruthenium, the iridium, and the titanium to the amount of platinum in a molar ratio of 98:2 to 80:20.
6. The anode of claim 1 , wherein the composite metal oxide comprises:
20 mol % to 35 mol % of the ruthenium;
10 mol % to 25 mol % of the iridium;
35 mol % to 60 mol % of the titanium; and
2 mol % to 20 mol % of the platinum, based on a total mole of metal components in the composite metal oxide.
7. The anode of claim 1 , wherein the metal base comprises titanium, tantalum, aluminum, hafnium, nickel, zirconium, molybdenum, tungsten, stainless steel, or an alloy thereof.