王园等：离子交换树脂对P/C催化剂耐久性的影响 1079· 20 nm 20 nm 22 (c)Mean size:2.70 nm (d) Mean size:3.76 nm 18 Sample I Sample I after ASI (accclerated stress test 16 before AST(accelerated stress test) 4 10 8 6 10 4 2 4￥ 5 6 4 5 6 Particle diameter/nm Particle diameter/nm 图7样品一在耐久性测试前(a,c)和2.7×10次耐久性循环测试后(b,d)相同位置的TEM电镜图(ab)和催化剂粒径分布图(c,d) Fig.7 TEM electron microscope image of the same position of the catalyst(a,b)and catalyst particle size distribution diagram(c,d)in sample 1 before the durability test(a,c),and after the 2.7x10 durability cycle test(b,d) (b) 20 nm 20 nm 30 (c)Mean size:2.44 nm 45 (d) Mean size:4.19 nm 5 40 Sample 2 Sample 2 before AST(accelerated stress test) fter AST(accclerated stress test 20 15 10 15 0 1 2 34567 8 9 10 2 3 891011 Particle diameter/nm 图8样品二在耐久性测试前(a,c)和2.7×10次耐久性循环测试后(b,d)相同位置的TEM电镜图(a,b)和催化剂粒径分布图(c,d) Fig.8 TEM electron microscope image of the same position of the catalyst(a,b)and catalyst particle size distribution diagram(c,d)in sample 2 before the durability test(a,c),and after the 2.7x10'durability cycle test(b,d)20 nm (a) 20 nm (b) Number of particles (c) Mean size: 2.70 nm Particle diameter/nm 1 2 22 18 20 16 14 12 10 8 6 4 2 0 3 4 5 6 7 8 Sample 1 before AST (accelerated stress test) Number of particles Particle diameter/nm (d) Mean size: 3.76 nm Sample 1 after AST (accclerated stress test) 30 25 20 15 10 5 0 1 2 3 4 5 6 7 8 图 7    样品一在耐久性测试前（a, c）和 2.7×104 次耐久性循环测试后（b, d）相同位置的 TEM 电镜图（a, b）和催化剂粒径分布图（c, d） Fig.7    TEM electron microscope image of the same position of the catalyst (a, b) and catalyst particle size distribution diagram (c, d) in sample 1 before the durability test (a, c), and after the 2.7×104 durability cycle test (b, d) (a) (b) 20 nm 20 nm Number of particles 30 25 20 10 15 5 0 (c)Mean size: 2.44 nm 1 2 3 4 5 6 7 8 9 10 Particle diameter/nm Sample 2 before AST (accelerated stress test) Number of particles 45 40 35 30 25 20 15 10 5 0 1 2 3 4 5 6 7 8 9 10 11 Particle diameter/nm (d) Mean size: 4.19 nm Sample 2 after AST (accclerated stress test) 图 8    样品二在耐久性测试前（a, c）和 2.7×104 次耐久性循环测试后（b, d）相同位置的 TEM 电镜图（a, b）和催化剂粒径分布图（c, d） Fig.8    TEM electron microscope image of the same position of the catalyst (a, b) and catalyst particle size distribution diagram (c, d) in sample 2 before the durability test (a, c), and after the 2.7×104 durability cycle test (b, d) 王    园等： 离子交换树脂对 Pt/C 催化剂耐久性的影响 · 1079 ·