Reduced graphene oxide-supported Pd@Au bimetallic nano electrocatalyst for enhanced oxygen reduction reaction in alkaline media

Raghavendra, P.; Reddy, G. Vishwakshan; Sivasubramanian, R.; Chandana, P. Sri; Sarma, Loka Subramanyam

doi:10.1016/j.ijhydene.2017.07.199

Cited by 43 publications

(6 citation statements)

References 69 publications

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“… 37 For the bio‐rGO/Pd nanocomposite, because of the incorporation of Pd nanoparticles within bio‐rGO, the restacking nature of bio‐rGO nanosheets is vanished which is clear from disappearance of the (002) diffraction peak 38 . It was detected three sharp diffraction peaks located at 39.98°, 46.47° and 67.88° which corresponds to (111), (200) and (220) planes of Pd nanoparticles (ICDD:00‐005‐0681), respectively 39 (Figure 5C). XRD data were also employed to determine the crystallite size of bio‐rPd nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Bio‐reduced GO /Pd nanocomposite as an efficient and green synthesized catalyst for hydrogen evolution reaction

Kayan

Turunç

2021

Int J Energy Res

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Summary In this work, we introduced a green methodology for the production of palladium (Pd) decorated reduced graphene oxide (rGO), using an endemic plant of Onosma malatyana Binzet (OMB) root extract for the first time and used it as an electrocatalyst for hydrogen evolution reaction (HER) in aqueous acidic media. Benefiting from the synergetic effect between rGO and Pd nanoparticles, the as‐prepared bio‐reduced GO/Pd (bio‐rGO/Pd) nanocomposite exhibits a remarkable performance towards HER when the results compared with the bio‐rGO and bio‐rPd nanocomposite. The HER overpotential at a current density of 10 mA cm−2 for bio‐rGO/Pd was only 0.17 V. The Tafel slope of the bio‐rGO/Pd nanocomposite film obtained from the HER polarization curves exhibits 154 mV dec−1, showing that the process is limited by the Volmer reaction step. In addition, the bio‐rGO/Pd nanocomposite electrode also showed an outstanding stability after a long‐term potential cycling measurement. It possesses a high synergetic effect, low charge transfer resistance and considerable electrochemical surface area. The all obtained results demonstrated that the bio‐rGO/Pd will be a promising green synthesized HER catalyst.

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Section: Resultsmentioning

confidence: 99%

Bio‐reduced GO /Pd nanocomposite as an efficient and green synthesized catalyst for hydrogen evolution reaction

Kayan

Turunç

2021

Int J Energy Res

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“…The agglomeration of metal catalysts during the reaction is of utmost concern that in turn lowers the efficiency of energy storage and conversion devices. Carbonaceous materials, such as mesoporous carbon nitride, graphene, reduced graphene oxide, , Vulcan carbon, , carbon nanotube (CNT), and so forth play a crucial role by increasing the electron conductivity and lowering of the Fermi level as well, despite having other innate advantages such as high specific surface area, high porosity, chemical inertness, and superior mechanical stability that improve the overall reaction kinetics. , Herein, we report the synthesis of a series of bimetallic palladium−nickel alloy supported on Vulcan XC-72R carbon (Pd 4– x Ni x /C ECs; x = 1–3) in three different Pd/Ni atomic ratios via a modified solvothermal method to explore their electrocatalytic activity toward ORR and FAO reactions in alkaline and acidic media, respectively. For comparison, the electrocatalytic activity of the standard Pd/C and Pt/C catalysts (abbreviated as Std.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Palladium–Nickel Nanoparticles Anchored on Carbon as High-Performance Electrocatalysts for Oxygen Reduction and Formic Acid Oxidation Reactions

Goswami

Saikia

Tada

et al. 2020

ACS Appl. Energy Mater.

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Herein, we report the synthesis of carbon-supported palladium–nickel electrocatalysts (ECs) (Pd4–x Ni x /C ECs, x = 1–3) as an important class of non-platinum ECs, for both oxygen reduction reaction (ORR) and formic acid oxidation (FAO) reactions. Among various as-synthesized ECs, the Pd3Ni/C catalyst exhibited the best performance, which outperforms the benchmark Pt/C and Pd/C catalysts. For ORR, the onset potential of Pd3Ni/C EC (0.96 V) is 40 and 80 mV more positive than that of the benchmark Pt/C (0.92 V) and Pd/C (0.88 V) catalysts, suggesting its remarkable ORR behavior. All Pd4–x Ni x /C (x = 1–3) compositions favored the “4e” reduction pathway during ORR in alkaline media. Furthermore, the ECs are very efficient toward the FAO reaction, which proceeds via the “dehydrogenation” pathway. The electrochemically active surface area of Pd3Ni/C EC is found to be ∼2-, ∼4-, ∼5-, and ∼35-fold higher than that of PdNi/C, PdNi3/C, Pd/C, and standard Pd/C ECs, respectively. The remarkable ORR/FAO activity of the synthesized ECs can be ascribed to the homogeneous dispersion of smaller palladium–nickel alloy nanoparticles over the carbon support, downshift of Pd d-band center, as well as synergistic effect between the metals that makes electron transfer easier. Meanwhile, the downshift of the Pd d-band center after alloying with Ni was confirmed via density functional theory calculations, which unveiled the superiority of Pd3Ni/C over other ECs and the benchmarks. Thus, this work represents a cost-effective and ecofriendly approach for designing high-performance anode as well as cathode catalytic materials for practical applications.

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“…52,53 In the case of prepared rGO-supported catalysts, the decreased intensities of characteristic peaks originating from oxygen functionalities signify the efficient reduction of GO to rGO. 54 The absorption bands at 1072 cm À1 (n as (P-O)), 977 cm À1 (n as (metal]O)), 879 cm À1 (n as (metal-O-metal)), and 786 cm À1 (n as (metal-O-metal)) belonging to the main characteristic peaks of POM, were depicted in the FT-IR spectral scan of POM. 43 These observations approve that the POM has the Keggin structure.…”

Section: Physical Characterization Of Electro-catalystsmentioning

confidence: 98%

Fabrication of polyoxometalate-modified palladium–nickel/reduced graphene oxide alloy catalysts for enhanced oxygen reduction reaction activity

Sanij

Balakrishnan

et al. 2021

RSC Adv.

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Reduced graphene oxide-supported Pd@Au bimetallic nano electrocatalyst for enhanced oxygen reduction reaction in alkaline media

Cited by 43 publications

References 69 publications

Bio‐reduced GO /Pd nanocomposite as an efficient and green synthesized catalyst for hydrogen evolution reaction

Bio‐reduced GO /Pd nanocomposite as an efficient and green synthesized catalyst for hydrogen evolution reaction

Bimetallic Palladium–Nickel Nanoparticles Anchored on Carbon as High-Performance Electrocatalysts for Oxygen Reduction and Formic Acid Oxidation Reactions

Fabrication of polyoxometalate-modified palladium–nickel/reduced graphene oxide alloy catalysts for enhanced oxygen reduction reaction activity

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