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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Preparation and characterization TiO^-Pt/C catalyst for hydrogen oxidation reaction
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Preparation and characterization TiO^-Pt/C catalyst for hydrogen oxidation reaction

机译：氢氧化反应用TiO ^ -Pt / C催化剂的制备与表征

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The hydrogen oxidation reaction (HOR) was studied at the home made TiO_x-Pt/C nanocatalysts in 0.5 mol dm~(-3) HC1O4 at 25 °C. Pt/C catalyst was first synthesized by modified ethylene glycol method (EG) on commercially used carbon support (Vulcan XC-72). Then TiO_x-Pt/C catalyst was prepared by the polyole method followed by TiO_x post-deposition. The synthesized catalyst was characterized by XRD, TEM and EDX techniques. It was found that Pt/C catalyst nanoparticles were homogenously distributed over carbon support with the mean particle size of about 2.4 nm. The quite similar, homogenous distribution and particle size were obtained for Pt/C doped by TiO_x catalyst which was the confirmation that TiO_x post-deposition did not lead to significant growth of the Pt nanoparticles. The electrochemically active surface area of the catalyst was determined by using the cyclic voltammetry technique.The kinetics of hydrogen oxidation was investigated by the linear sweep voltammetry technique at the rotating disc electrode (RDE). The kinetic equations used for the analysis were derived considering the reversible or irreversible nature of the kinetics of the HOR. It was found that the hydrogen oxidation reaction for an investigated catalyst proceeded as an electrochemically reversible reaction. The values determined for the kinetic parameters-Tafel slope of 28 mV dec~(-1) and exchange current density about 0.4 mA cm~(~2)_(Pt) are in good agreement with usually reported values for a hydrogen oxidation reaction with platinum catalysts in acid solutions.
机译：在自制的TiO_x-Pt / C纳米催化剂在0.5 mol dm〜（-3）HCl中于25°C下研究了氢氧化反应（HOR）。 Pt / C催化剂首先通过修饰的乙二醇法（EG）在市售碳载体（Vulcan XC-72）上合成。然后采用多元醇法制备TiO_x-Pt / C催化剂，然后进行TiO_x后沉积。通过XRD，TEM和EDX技术对合成的催化剂进行了表征。发现Pt / C催化剂纳米颗粒均匀分布在碳载体上，平均粒径为约2.4nm。对于用TiO_x催化剂掺杂的Pt / C，获得了非常相似，均匀的分布和粒径，这证实了TiO_x的后沉积不会导致Pt纳米粒子的显着生长。采用循环伏安法测定催化剂的电化学活性表面积。采用线性扫描伏安法在转盘电极（RDE）上研究氢的氧化动力学。考虑到HOR动力学的可逆性或不可逆性，得出了用于分析的动力学方程。已发现，所研究的催化剂的氢氧化反应作为电化学可逆反应进行。动力学参数-Tafel斜率确定为28 mV dec〜（-1），交换电流密度约为0.4 mA cm〜（〜2）_（Pt），与通常报道的氢氧化反应的值非常吻合。酸性溶液中的铂催化剂。

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