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首页> 外文期刊>Journal of power sources >Effect of Ti addition to Pt/C catalyst on methanol electro-oxidation and oxygen electro-reduction reactions
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Effect of Ti addition to Pt/C catalyst on methanol electro-oxidation and oxygen electro-reduction reactions

机译：Pt / C催化剂中添加Ti对甲醇电氧化和氧电还原反应的影响

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摘要

Carbon supported binary Pt-Ti alloys were investigated for application in methanol electro-oxidation (MOR) and oxygen electro-reduction reactions (ORR). Various compositions of Pt_(100-x)Ti_x/C (x = 0, 25, 50, and 75) catalysts were synthesized by sequential impregnation of Pt and Ti followed by annealing at 900 ℃ for 30 min under H_2/Ar flow. X-ray diffraction results showed formation of the Pt_3Ti intermetallic phase in Pt_(50)Ti_(50) and Pt_(25)Ti_(75) catalysts after annealing at 900 ℃. The Pt_(50)Ti_(50)/C-900 and Pt_(25)Ti_(75)/C-900 catalysts (the '-900' designation indicates the catalyst was annealed at 900 ℃) exhibited 103% (87.4 mA mg_(Pt)~(-1)) and 198% (128 mA mg_(Pt)~(-1)) higher MOR activity, respectively, than in the Pt/C-900 catalyst (43.0 mA mg_(Pt)~(-1)) at 0.7 V (vs. reversible hydrogen electrode (RHE)). These two catalysts also showed high ORR activity. From a specific activity basis, the Pt_(50)Ti_(50)/C-900 and Pt_(25)Ti_(75)/C-900 catalysts exhibited 32.3 and 30.2 μA cm_(Pt)~(-2), respectively, which were 171 and 154% higher than the 11.9 μA cm_(Pt)~(-2) value of the Pt/C catalyst at 0.8 V (vs. RHE). Methanol-tolerant ORR activity was also investigated, but in the presence of methanol, the Pt_(50)Ti_(50)/C-900 and Pt_(25)Ti_(75)/C-900 catalysts both exhibited poor ORR activity.
机译：研究了碳载二元Pt-Ti合金在甲醇电氧化（MOR）和氧电还原反应（ORR）中的应用。通过依次浸渍Pt和Ti，然后在H_2 / Ar流下于900℃退火30分钟，合成了各种组成的Pt_（100-x）Ti_x / C（x = 0、25、50和75）催化剂。 X射线衍射结果表明，在900℃退火后，Pt_（50）Ti_（50）和Pt_（25）Ti_（75）催化剂中形成了Pt_3Ti金属间相。 Pt_（50）Ti_（50）/ C-900和Pt_（25）Ti_（75）/ C-900催化剂（-900表示催化剂在900℃退火）显示103％（87.4 mA mg_ （Pt）〜（-1））和MOR活性分别比Pt / C-900催化剂（43.0 mA mg_（Pt）〜（-）高出198％（128 mA mg_（Pt）〜（-1）） 1））在0.7 V（vs.可逆氢电极（RHE））下进行。这两种催化剂还显示出高的ORR活性。从比活度的角度来看，Pt_（50）Ti_（50）/ C-900和Pt_（25）Ti_（75）/ C-900催化剂分别显示32.3和30.2μAcm_（Pt）〜（-2），它们在0.8 V（vs. RHE）时比Pt / C催化剂的11.9μAcm_（Pt）〜（-2）值分别高171和154％。还研究了耐甲醇的ORR活性，但在甲醇存在下，Pt_（50）Ti_（50）/ C-900和Pt_（25）Ti_（75）/ C-900催化剂均显示较差的ORR活性。

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