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One-step synthesis of Fe₃PtPd(OH)₂[Picolinic acid]₈(H₂O)₄ hybrid nanorods: efficient and stable electrocatalyst for oxygen reduction reaction in alkaline solution.

ABSTRACT: Design and synthesis of effective electrocatalysts for oxygen reduction reaction in alkaline environments is critical to reduce energy losses in alkaline fuel cells. We have systematically evaluated new approaches for reducing the Pt content while retaining the activity of a Pt-based catalyst with hydrolytic phases containing hydroxide moieties in addition to metal ions and ligands. We report for the first time architectured organic-inorganic hybrid nanorod catalyst, which is fabricated by solvothermal reaction of K₂MCl₄ (M?=?Pd, Pt) with picolinic acid (PA) (chelating agent) in the presence of FeCl₂. Excess base produces isostructural coordination M-PA complex to Fe-OH chains. A generic formula can be written as Fe₃PtPd(OH)₂[PA]₈(H₂O)₄. The electrocatalytic activities of the hybrid nanorods are explored for oxygen reduction reaction (ORR) in alkaline medium. The onset potential of ORR is significantly reduced with a positive shift of about 109?mV and twice the reduction current density is observed in comparison with Pt/C with the same mass loading. We believe that this work may lead towards the development of heterodoped organic- inorganic hybrid materials with greatly enhanced activity and durability for applications in catalysis and energy conversion.

SUBMITTER: Asiabi H

PROVIDER: S-EPMC6193002 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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One-step synthesis of Fe3PtPd(OH)2[Picolinic acid]8(H2O)4 hybrid nanorods: efficient and stable electrocatalyst for oxygen reduction reaction in alkaline solution.

Asiabi Hamid H Yamini Yadollah Y Shamsayei Maryam M Saievar-Iranizad Esmaiel E Bayat Amir A Kaverlavani Saeid Kamari SK

Scientific reports 20181017 1

Design and synthesis of effective electrocatalysts for oxygen reduction reaction in alkaline environments is critical to reduce energy losses in alkaline fuel cells. We have systematically evaluated new approaches for reducing the Pt content while retaining the activity of a Pt-based catalyst with hydrolytic phases containing hydroxide moieties in addition to metal ions and ligands. We report for the first time architectured organic-inorganic hybrid nanorod catalyst, which is fabricated by solvo ...[more]

PMID: 30333559

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Project description:Along with the development of nanotechnology, nanomaterials have been gradually applied to agriculture in recent years, such as Cu(OH)2-nanorods-based nanopesticide, an antibacterial agrochemical with a high efficacy. Nevertheless, knowledge about physical stability of Cu(OH)2 nanopesticide in soil solutions is currently scarce, restricting comprehensive understanding of the fate and risk of Cu(OH)2 nanopesticide in the soil environment. Herein we investigated aggregation, sedimentation and dissolution of Cu(OH)2 nanopesticide in soil solutions extracted from three different soil samples, wherein commercial Cu(OH)2 nanopesticide formulation (NPF), as well as its active ingredient (AI) and laboratory-prepared Cu(OH)2 nanorods (NR) with similar morphology as AI, were used as model Cu(OH)2 nanopesticides. We found that NPF compared to AI showed less extents of aggregation in ultrapure water due to the presence of dispersing agent in NPF. Yet, moderated aggregation and sedimentation were observed for Cu(OH)2 nanopesticide irrespective of NPF, AI or NR when soil solutions were used instead of ultrapure water. The sedimentation rate constants of AI and NPF were 0.023 min-1 and 0.010 min-1 in the ultrapure water, whereas the rate constants of 0.003-0.021 min-1 and 0.002-0.007 min-1 were observed for AI and NPF in soil solutions, respectively. Besides aggregation and sedimentation, dissolution of Cu(OH)2 nanopesticide in soil solutions was highly dependent on soil type, wherein pH and organic matter played important roles in dissolution. Although the final concentrations of dissolved copper (1.08-1.37 mg/L) were comparable among different soil solutions incubating 48 mg/L of AI, NPF or NR for 96 h, a gradual increase followed by an equilibrium was only observed in the soil solution from acidic soil (pH 5.16) with the low content of organic matter (1.20 g/kg). This work would shed light on the fate of Cu(OH)2 nanopesticide in the soil environment, which is necessary for risk assessment of the nanomaterials-based agrochemical.

Dataset Information

One-step synthesis of Fe₃PtPd(OH)₂[Picolinic acid]₈(H₂O)₄ hybrid nanorods: efficient and stable electrocatalyst for oxygen reduction reaction in alkaline solution.

Publications

One-step synthesis of Fe<sub>3</sub>PtPd(OH)<sub>2</sub>[Picolinic acid]<sub>8</sub>(H<sub>2</sub>O)<sub>4</sub> hybrid nanorods: efficient and stable electrocatalyst for oxygen reduction reaction in alkaline solution.

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