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首页> 外文期刊>International Journal of Electrochemical Science >PtBi/C Electrocatalysts for Formic Acid Electro-Oxidation in Acid and Alkaline Electrolyte
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PtBi/C Electrocatalysts for Formic Acid Electro-Oxidation in Acid and Alkaline Electrolyte

机译：在酸性和碱性电解质中甲酸电氧化的PtBi / C电催化剂

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Pt/C and PtBi/C with different PtBi atomic ratio (90:10, 80:20, 70:30, 60:40 and 50:50) were preparedby borohydride reduction method using H2PtCl66H2O and Bi(NO3)35H2O as metal sources andVulcan XC72 as carbon support. The electrocatalysts prepared were characterized by X-ray diffraction,transmission electron microscopy and cyclic voltammetry. The activity for the formic acid electro- oxidation in acid and alkaline electrolyte was investigated at room temperature by cyclic voltammetryand chronoamperometry. X ray diffraction showed for all PtBi/C the presence of Pt face-centeredcubic (fcc) system, while for PtBi/C (70:30, 60:40 and 50:50) electrocatalyst it was also observed thepresence of some peaks that could be attributed to the presence of Bi metallic, Bi oxide species or PtBiphases. TEM micrographs and histograms for PtBi/C electrocatalysts showed that the nanoparticles arewell dispersed on the support with particle sizes of 2.51.5 nm for all electrocatalysts prepared,however some agglomerates were also observed. The electrochemical studies showed that PtBi/Co (90:10) had superior performance for formic acid electro-oxidation at 25 C in presence of acidicelectrolyte compared to Pt/C, this result indicated that the addition of Bi to Pt could favor the electro- oxidation of formic acid and this effect could be attributed to the bifunctional mechanism associated toelectronic effect. However in the alkaline electrolyte it was observed that Pt/C electrocatalysts hadsuperior performance in comparison with PtBi/C, this result indicated that an optimization of theformic acid concentration for alkaline studies is still necessary.
机译：采用硼氢化物还原法，以H2PtCl66H2O和Bi（NO3）35H2O为金属源，通过硫化氢硼氢化法制备了具有不同PtBi原子比（90：10、80：20、70：30、60：40和50:50）的Pt / C和PtBi / C。 XC72作为碳载体。通过X射线衍射，透射电子显微镜和循环伏安法对制备的电催化剂进行了表征。在室温下通过循环伏安法和计时电流法研究了甲酸在酸性和碱性电解质中的电氧化活性。 X射线衍射表明，对于所有PtBi / C，都存在Pt面心立方（fcc）系统，而对于PtBi / C（70：30、60：40和50:50）电催化剂，还观察到一些可能存在的峰。归因于存在Bi金属，Bi氧化物或PtBiphases。 PtBi / C电催化剂的TEM显微照片和直方图显示，对于所有制备的电催化剂，纳米颗粒均以2.51.5 nm的粒径很好地分散在载体上，但是也观察到一些团聚体。电化学研究表明，与Pt / C相比，PtBi / Co（90:10）在酸性电解质存在下，在25°C的条件下对甲酸的电氧化性能要好于Pt / C，这一结果表明，向Pt中添加Bi可以有利于电氧化。甲酸的氧化，这种作用可归因于与电子作用有关的双功能机理。然而，在碱性电解质中，观察到Pt / C电催化剂比PtBi / C具有更好的性能，该结果表明对于碱性研究来说，甲酸的浓度仍然是最优化的。

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