Effect of Ti addition to Pt/C catalyst on methanol electro-oxidation and oxygen electro-reduction reactions
Effect of Ti addition to Pt/C catalyst on methanol electro-oxidation and oxygen electro-reduction reactions
复制标题
DOI：
10.1016/j.jpowsour.2009.10.031
复制
发表时间：
2010-05
影响因子：
9.2
通讯作者：
M. Jeon;P. McGinn
中科院分区：
文献类型：
--
作者：
M. Jeon;P. McGinn
研究了碳负载二元 Pt-Ti 合金在甲醇电氧化 (MOR) 和氧电还原反应 (ORR) 中的应用。通过顺序浸渍 Pt 和 Ti，然后在 H2/Ar 流下于 900°C 退火 30 分钟，合成了各种成分的 Pt100−xTix/C（x=0、25、50 和 75）催化剂。 X射线衍射结果表明，在900℃退火后，Pt50Ti50和Pt25Ti75催化剂中形成了Pt3Ti金属间相。 Pt50Ti50/C-900 和 Pt25Ti75/C-900 催化剂（“-900”表示催化剂在 900°C 下退火）的 MOR 活性分别比 Pt/C-900 催化剂高 103% (87.4mAmgPt−1) 和 198% (128mAmgPt−1) (43.0mAmgPt−1)，0.7V（相对于可逆氢电极 (RHE)）。这两种催化剂还表现出高ORR活性。从比活度来看，Pt50Ti50/C-900和Pt25Ti75/C-900催化剂分别表现出32.3和30.2μAcmPt−2，比Pt/C催化剂在0.8V（相对于RHE）下的11.9μAcmPt−2值高171和154%。还研究了耐甲醇的 ORR 活性，但在甲醇存在下，Pt50Ti50/C-900 和 Pt25Ti75/C-900 催化剂均表现出较差的 ORR 活性。
Carbon supported binary Pt–Ti alloys were investigated for application in methanol electro-oxidation (MOR) and oxygen electro-reduction reactions (ORR). Various compositions of Pt100−xTix/C (x=0, 25, 50, and 75) catalysts were synthesized by sequential impregnation of Pt and Ti followed by annealing at 900°C for 30min under H2/Ar flow. X-ray diffraction results showed formation of the Pt3Ti intermetallic phase in Pt50Ti50and Pt25Ti75catalysts after annealing at 900°C. The Pt50Ti50/C-900 and Pt25Ti75/C-900 catalysts (the ‘-900’ designation indicates the catalyst was annealed at 900°C) exhibited 103% (87.4mAmgPt−1) and 198% (128mAmgPt−1) higher MOR activity, respectively, than in the Pt/C-900 catalyst (43.0mAmgPt−1) at 0.7V (vs. reversible hydrogen electrode (RHE)). These two catalysts also showed high ORR activity. From a specific activity basis, the Pt50Ti50/C-900 and Pt25Ti75/C-900 catalysts exhibited 32.3and30.2μAcmPt−2, respectively, which were 171 and 154% higher than the 11.9μAcmPt−2value of the Pt/C catalyst at 0.8V (vs. RHE). Methanol-tolerant ORR activity was also investigated, but in the presence of methanol, the Pt50Ti50/C-900 and Pt25Ti75/C-900 catalysts both exhibited poor ORR activity.