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Meléndez‐González, Perla C.; Sánchez‐Castro, Esther; Alonso‐Lemus, Ivonne L.; Pérez‐Hernández, Raúl; Escobar‐Morales, Beatriz; Garay‐Tapia, Andrés M.; Pech‐Rodríguez, Wilian J.; Rodríguez‐Varela, Javier
ChemistrySelect (Weinheim), November 30, 2020, Letnik: 5, Številka: 44Journal Article
The catalytic activity and electrochemical stability of Pd‐CeO2‐NR/C (CeO2‐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‐CeO2‐NR/C promotes the reaction with a percentage of hydrogen peroxide production (%H2O2) around 2–4 %, and an electron transfer number (n) close to 4. Tafel plots demonstrates higher mass and specific activities of Pd‐CeO2‐NR/C than Pd/C. Moreover, from cyclic voltammetry tests, Pd‐CeO2‐NR/C shows a higher mass catalytic activity (jm= 697 mA mg−1Pd) for the EOR at a more negative onset potential (Eonset= 0.29 V/RHE) than Pd/C. After Accelerated Degradation Tests (ADT), Pd‐CeO2‐NR/C retains ∼98 % of its Electrochemically Active Surface Area (ECSA), higher than ∼51 % of Pd/C. After ADT, the performance of Pd‐CeO2‐NR/C remains similar for the ORR, while it is significantly higher for the EOR, compared to Pd/C. Thus, the addition of CeO2‐NR enhances the electrocatalytic behavior and stability of Pd towards the ORR and the EOR. Pd‐CeO2‐NR/C (CeO2‐NR=cerium oxide nanorods) is a novel bifunctional nanocatalyst with application as anode for the Ethanol Oxidation Reaction (EOR) and as cathode for the Oxygen Reduction Reaction (ORR). It shows a high mass and specific catalytic activity for the ORR and excellent performance for the EOR (63 % increase in jm after ADT), along with remarkable electrochemical stability (98 % of ECSA retention) after ADT.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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