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首页> 外文期刊>International Journal of Electrochemical Science >Synthesis of PdAu/C and PdAuBi/C Electrocatalysts by Borohydride Reduction Method for Ethylene Glycol Electro-oxidation in Alkaline Medium
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Synthesis of PdAu/C and PdAuBi/C Electrocatalysts by Borohydride Reduction Method for Ethylene Glycol Electro-oxidation in Alkaline Medium

机译：硼氢化物还原法在碱性介质中乙二醇电氧化法合成PdAu / C和PdAuBi / C电催化剂

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Pd/C, Au/C, AuBi/C, PdAu/C, PdAuBi/C electrocatalysts (with different atomic ratios and 20 wt% ofmetal loading) were prepared by borohydride reduction method using a water/2-propanol mixture assolvent, Pd(NO3)2.2H2O, HAuCl4.3H2O and Bi(NO3)3.5H2O as metal sources, carbon black VulcanXC72 as support and NaBH4 as reducing agent. The obtained electrocatalysts were characterized byenergy dispersive X-ray analysis (EDX), X-ray diffraction (XRD), transmission electron microscopy(TEM) and cyclic voltammetry. The activities of the prepared electrocatalysts for ethylene glycolelectro-oxidation were investigated by chronoamperometry using the thin porous coating technique.The atomic ratios of the electrocatalysts determined by EDX were similar to the nominal values. TheX-ray diffratograms of Pd/C and PdAu/C showed the presence of Pd(fcc) phase and Pd-Au(fcc) alloys,respectively. Depending on the Au content, segregated fcc Pd-rich and Au-rich phases were observedin the PdAu/C electrocatalysts. PdAuBi/C also showed the presence of fcc alloys while for Bi/C thepresence of bismuth oxide phase was observed. TEM micrographs of all electrocatalysts showed amean particle sizes in the range of 5 nm and a monomodal and relatively broad distribution ofparticle sizes. Electrochemical experiments indicate that the PdAuBi/C (50:45:05) electrocatalyst hasthe higher electroactivity than others obtained electrocatalysts.
机译：使用水/ 2-丙醇混合溶剂硼氢化物还原法制备了Pd / C，Au / C，AuBi / C，PdAu / C，PdAuBi / C电催化剂（具有不同的原子比和20％的金属负载量）。 NO3）2.2H2O，HAuCl4.3H2O和Bi（NO3）3.5H2O作为金属源，炭黑VulcanXC72作为载体，NaBH4作为还原剂。通过能量色散X射线分析（EDX），X射线衍射（XRD），透射电子显微镜（TEM）和循环伏安法对所得的催化剂进行了表征。用稀薄多孔涂层技术通过计时安培法研究了制得的乙二醇电氧化催化剂的活性。用EDX法测定该催化剂的原子比与标称值相近。 Pd / C和PdAu / C的X射线衍射图分别显示了Pd（fcc）相和Pd-Au（fcc）合金的存在。根据Au的含量，在PdAu / C电催化剂中观察到了偏析的fcc富Pd相和富Au相。 PdAuBi / C还显示出fcc合金的存在，而Bi / C观察到存在氧化铋相。所有电催化剂的TEM显微照片均显示5mm的纳米颗粒尺寸和单峰且相对较宽的颗粒尺寸分布。电化学实验表明，PdAuBi / C（50:45:05）电催化剂比其他获得的电催化剂具有更高的电活性。

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