Anode catalyst layer of membrane electrode assembly and preparation method thereof

Abstract

An anode catalyst layer for a membrane electrode assembly including 30-43 wt % of an anode catalyst, 10-20 wt % of an ionomer solution, 0.02-0.04 wt % of a multidimensional carbon material, and 0.3-0.4 wt % of a multi-walled carbon nanotube is provided. A method for preparing the anode catalyst layer, the membrane electrode assembly that is prepared using the anode catalyst layer, and a method for preparing the membrane electrode assembly are also provided.

What is claimed is: 
     
         1 . An anode catalyst layer for a membrane electrode assembly, the anode catalyst layer comprising:
 30-43 wt % of an anode catalyst;   10-20 wt % of an ionomer solution;   0.02-0.04 wt % of a multidimensional carbon material; and   0.3-0.4 wt % of a multi-walled carbon nanotube, wherein the anode catalyst is PbO 2 , Pb 3 O 4 , or a combination thereof.   
     
     
         2 . The anode catalyst layer for the membrane electrode assembly according to  claim 1 , wherein the anode catalyst is a combination of PbO 2  and Pb 3 O 4  in a weight ratio from 10:1 to 1:10. 
     
     
         3 . The anode catalyst layer for the membrane electrode assembly according to  claim 1 , wherein the multidimensional carbon material is graphene, graphene oxide, reduced graphene oxide, or any combination thereof. 
     
     
         4 . The anode catalyst layer for the membrane electrode assembly according to  claim 1 , further comprising:
 2-6 wt % of a hydrophobic solution;   3-10 wt % of an acidic solution; and   30-40 wt % of deionized water.   
     
     
         5 . The anode catalyst layer for the membrane electrode assembly according to  claim 4 , wherein the anode catalyst is a combination of PbO 2  and Pb 3 O 4  in a weight ratio from 10:1 to 1:10. 
     
     
         6 . The anode catalyst layer for the membrane electrode assembly according to  claim 4 , wherein the multidimensional carbon material is graphene, graphene oxide, reduced graphene oxide, or any combination thereof. 
     
     
         7 . A method for preparing an anode catalyst layer for a membrane electrode assembly, the method comprising:
 mixing 30-40 wt % of deionized water with an ionomer solution, a hydrophobic solution, and an acidic solution to form a first mixture;   adding 30-43 wt % of an anode catalyst, a multi-walled carbon nanotube, and a multidimensional carbon material to the first mixture to form a second mixture;   rotating the second mixture at 15000-18000 rpm for 30-50 minutes to form a homogeneous coating; and   applying the homogeneous coating to a transfer substrate and drying at 25-30° C. for 10-15 minutes.   
     
     
         8 . The method according to  claim 7 , wherein the ionomer solution is 10-20 wt %, the hydrophobic solution is 2-6 wt %, the acidic solution is 3-10 wt %, the multi-walled carbon nanotube is 0.3-0.4 wt %, and the multidimensional carbon material is 0.02-0.04 wt %. 
     
     
         9 . A membrane electrode assembly comprising the anode catalyst layer according to  claim 1 . 
     
     
         10 . A method for preparing a membrane electrode assembly, the method comprising:
 sequentially stacking a cathode catalyst electrode, a solid electrolyte membrane, and the anode catalyst layer according to  claim 1  to form the membrane electrode assembly; and   hot-pressing the membrane electrode assembly at 120-140° C. under 20-60 kgf/cm 2  for 2 minutes.   
     
     
         11 . The method according to  claim 10 , wherein the anode catalyst layer has a loading per unit area of 30-60 mg/cm 2 . 
     
     
         12 . A method for preparing a membrane electrode assembly, the method comprising:
 sequentially stacking a cathode catalyst electrode, a solid electrolyte membrane, and the anode catalyst layer according to  claim 4  to form the membrane electrode assembly; and   
       hot-pressing the membrane electrode assembly at 120-140° C. under 20-60 kgf/cm 2  for 2 minutes. 
     
     
         13 . The method according to  claim 12 , wherein the anode catalyst layer has a loading per unit area of 30-60 mg/cm 2 . 
     
     
         14 . A method for preparing a membrane electrode assembly, the method comprising:
 mixing 30-40 wt % of deionized water with an ionomer solution, a hydrophobic solution, and an acidic solution to form a first mixture;   adding 30-43 wt % of an anode catalyst, a multi-walled carbon nanotube, and a multidimensional carbon material to the first mixture to form a second mixture;   rotating the second mixture at 15000-18000 rpm for 30-50 minutes to form a homogeneous coating;   applying the homogeneous coating to a transfer substrate and drying at 25-30° C. for 10-15 minutes to form an anode catalyst layer;   sequentially stacking a cathode catalyst electrode, a solid electrolyte membrane, and the anode catalyst layer to form a membrane electrode assembly;   hot-pressing the membrane electrode assembly at 120-140° C. under 20-60 kgf/cm 2  for 2 minutes; and   removing the transfer substrate.   
     
     
         15 . The method according to  claim 14 , wherein the ionomer solution is 10-20 wt %, the hydrophobic solution is 2-6 wt %, the acidic solution is 3-10 wt %, the multi-walled carbon nanotube is 0.3-0.4 wt %, and the multidimensional carbon material is 0.02-0.04 wt %. 
     
     
         16 . The method according to  claim 14 , wherein the anode catalyst layer has a loading per unit area of 30-60 mg/cm 2 .