双功能
纳米棒
塔菲尔方程
催化作用
电化学
循环伏安法
材料科学
过氧化氢
电催化剂
化学
无机化学
核化学
纳米技术
电极
有机化学
物理化学
作者
P.C. Meléndez‐González,Esther Sánchez‐Castro,Ivonne Liliana Alonso-Lemus,R. Pérez-Hernández,Beatriz Escobar,A.M. Garay-Tapia,W. J. Pech-Rodríguez,F.J. Rodríguez‐Varela
标识
DOI:10.1002/slct.202003755
摘要
Abstract The catalytic activity and electrochemical stability of Pd‐CeO 2‐NR /C (CeO 2‐NR : cerium oxide nanorods) for the Oxygen Reduction Reaction (ORR) and the Ethanol Oxidation Reaction (EOR) is shown in alkaline media and compared to Pd/C. Evaluation of catalytic activity for the ORR in a Rotating Ring Disc Electrode (RRDE) set‐up, shows that Pd‐CeO 2‐NR /C promotes the reaction with a percentage of hydrogen peroxide production (%H 2 O 2 ) around 2–4 %, and an electron transfer number (n) close to 4. Tafel plots demonstrates higher mass and specific activities of Pd‐CeO 2‐NR /C than Pd/C. Moreover, from cyclic voltammetry tests, Pd‐CeO 2‐NR /C shows a higher mass catalytic activity (j m = 697 mA mg −1 Pd ) for the EOR at a more negative onset potential (E onset= 0.29 V/RHE) than Pd/C. After Accelerated Degradation Tests (ADT), Pd‐CeO 2‐NR /C retains ∼98 % of its Electrochemically Active Surface Area (ECSA), higher than ∼51 % of Pd/C. After ADT, the performance of Pd‐CeO 2‐NR /C remains similar for the ORR, while it is significantly higher for the EOR, compared to Pd/C. Thus, the addition of CeO 2‐NR enhances the electrocatalytic behavior and stability of Pd towards the ORR and the EOR.
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