PdNi electrocatalyst for oxygen reduction in acid media
PdNi electrocatalyst for oxygen reduction in acid media
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DOI：
10.1016/j.ijhydene.2008.03.004
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发表时间：
2008-07
影响因子：
7.2
通讯作者：
G. Ramos-Sánchez;H. Yee-Madeira;O. Solorza-Feria
中科院分区：
文献类型：
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作者：
G. Ramos-Sánchez;H. Yee-Madeira;O. Solorza-Feria
将分散在Nafion溶液中的PdNi纳米颗粒用作墨水型电极，在酸性介质中进行氧还原反应（ORR）。该催化剂是通过氯化物前体与NaBH 4在四氢呋喃（THF）中在25 ℃下的金属还原沉淀来合成的。用X射线衍射（XRD）和透射电子显微镜（TEM）对催化剂进行了表征，结果表明催化剂为面心立方（fcc）六方结构，粒径范围为8- 10 nm。循环伏安图和极化曲线从双盘电极测量显示出显着更高的活性PdNi上观察到的Pd催化剂，与涉及四个电子转移到水的形成的机制。在25 ℃的0.5M H2SO 4溶液中，Ni（一种电负性较弱的金属）与Pd的结合使ORR的起始电位正向移动约110 mV，在0.5mAcm-2下，阴极过电位比Pd上获得的过电位降低260 mV。
The PdNi nanoparticles dispersed on Nafion solution was used as an ink-type electrode for oxygen reduction reaction (ORR), in acid media. This bimetallic catalyst was synthesized via the metallic reductive precipitations of the chloride precursors with NaBH4in tetrahydrofuran (THF) at 25∘C. The characterization of the electrocatalyst using X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed bimetallic nanoparticles having a narrow size ranged 8–10nm with face-centered cubic (fcc) hexagonal structure. Cyclic voltammograms and polarization curves from rotating-disk electrode measurements showed significantly higher activity on PdNi than observed on Pd catalyst, with a mechanism involving four electrons transfer to water formation. The incorporation of Ni, a less electronegative metal to Pd shifts the onset potential for the ORR approximately 110mV more positive, and at 0.5mAcm-2the cathode overpotential is reduced by 260mV in relation to that obtained on Pd, in a 0.5M H2SO4solution at 25∘C.