Se-modified Ru nanoparticles as ORR catalysts

Choi, Jong‐Ho; Johnston, Christina; Cao, Dianxue; Babu, P.; Zelenay, Piotr

doi:10.1016/j.jelechem.2011.07.029

Cited by 8 publications

(1 citation statement)

References 29 publications

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“…[2,[5][6][7] Although Pt and its alloys have served as the best ORR catalysts, these problems can be exacerbated when they are used in DMFC because the decomposition product of methanol (CO) can slow down the ORR kinetics by blocking the Pt catalyst surface. [8][9][10][11] Therefore, a non-Pt catalyst with low cost, high ORR activity and selectivity for DMFC is urgently required. [12][13][14] Compared to Pt, Pd is less expensive, more abundant, and has a low methanol poisoning and high ORR activity.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of low‐cost Co‐Sn‐Pd/rGO catalysts via ultrasonic irradiation and their electrocatalytic activities toward oxygen reduction reaction

Wang

Sheng

et al. 2021

Can J Chem Eng

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Reduced graphene supported Co-Sn-Pd nanoparticle catalysts(Co 0.2 Sn x Pd y / rGO, x + y = 0.4) were successfully synthesized by reducing the trace amounts of ions (Pd 2+ , Sn 2+ , and Co 2+ ) in the presence of reduced graphene via an ultrasonic irradiation method. Characterization of the Co 0.2 Sn x Pd y /rGO catalysts by X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicates that the Co 0.2 Sn 0.2 Pd 0.2 /rGO catalyst with a mean diameter of $3.8 nm is close to a single-phase solid solution. X-ray photoelectron spectroscopy (XPS) shows the binding energy of metallic Pd shifts to a higher angle in the Co 0.2 Sn x Pd y /rGO (x + y = 0.4) catalysts, indicating a shift of Pd electronic centre upon alloying with Co and Sn. Conventionally, ternary Co-Sn-Pd/rGO catalysts show greater oxygen reduction reaction (ORR) activities and durability than binary Pd-Co/rGO catalyst and 20 wt% Pt/C catalyst even at a very low Pd content. Among of the synthetic catalysts, the Co 0.2 Sn 0.2 Pd 0.2 /rGO catalyst exhibits the best ORR activity (E 1/2 = 0.91 V, k = −57 mV Á dec −1 ) and dominates a 4-electron pathway in the ORR process (n = 3.95 ± 0.09, H 2 O 2 <4%). Also, the Co 0.2 Sn x Pd y /rGO (x + y = 0.4) catalysts display a remarkable advantage of high methanol tolerance compared to that of the commercial 20 wt% Pt/C catalyst, which make them potential candidates for direct methanol fuel cells.

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