Efficient Synthesis of Fe/N-Doped Carbon Nanotube as Highly Active Catalysts for Oxygen Reduction Reaction in Alkaline Media

Zhang, Da; Zhang, Chuanqi; Tang, Yuanzheng; Yuan, Tiejian; Dong, Qianpeng; Bi, Lansen; Shi, Song; He, Yan

doi:10.1021/acs.langmuir.2c01130

Cited by 15 publications

(12 citation statements)

References 51 publications

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“…In addition, the Tafel slopes of various catalysts were calculated so as to assess the catalytic kinetics, as depicted in Figure c–f. The Tafel slope of the Pt/CNT catalyst is 71.3 mV dec –1 , and the Tafel slopes of binary and ternary catalysts are significantly less than those of Pt/CNT and JM-Pt/C we previously reported. , Especially the PtRuFe/CNT catalyst shows the smallest Tafel slope of 36.1 mV dec –1 , implying its fastest catalytic kinetics. Figure g,h depicts the mass and specific activities of the catalysts, and JM-Pt/C was used for comparison.…”

Section: Resultscontrasting

confidence: 58%

“…The S BET values of Pt/CNT, Pt 3 Ru/CNT, and PtRu/CNT catalysts synthesized by plasma thermal treatment are 229.9, 215.9, and 234.2 m 2 g −1 , which are a little lower than that (247.6 m 2 g −1 ) of CNTs reported by our previous work. 48 and the average pore diameters are about 14−20 nm, which are smaller than the diameter (20−30 nm) of CNTs. This result may be attributed to the destruction of CNTs caused by plasma, resulting in the collapse of partial pores.…”

Section: ■ Results and Discussionmentioning

confidence: 82%

“…Raman spectroscopy was employed to assess the graphitization degree of various catalysts, as depicted in Figure a; the catalysts synthesized by plasma thermal treatment show a low graphitization degree, and the I D / I G values of Pt/CNT, Pt 3 Ru/CNT, and PtRu/CNT catalysts are 1.23, 1.30, and 1.25, respectively, which are lower than the graphitization degree ( I D / I G = 1.04) of the original CNT we previously reported . These results indicate that the CNT structure was destroyed to a certain extent under the action of plasma.…”

Section: Resultsmentioning

confidence: 99%

“…The pore size and specific surface area ( S BET ) of the catalysts, as important physical indexes affecting catalytic properties, were tested by N 2 adsorption/desorption curves in Figure c,d, and the relevant parameters are summarized in Table S3. The S BET values of Pt/CNT, Pt 3 Ru/CNT, and PtRu/CNT catalysts synthesized by plasma thermal treatment are 229.9, 215.9, and 234.2 m 2 g –1 , which are a little lower than that (247.6 m 2 g –1 ) of CNTs reported by our previous work . and the average pore diameters are about 14–20 nm, which are smaller than the diameter (20–30 nm) of CNTs.…”

Section: Resultsmentioning

confidence: 99%

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PtRuFe/Carbon Nanotube Composites as Bifunctional Catalysts for Efficient Methanol Oxidation and Oxygen Reduction

Zhang

Tang

2023

Langmuir

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The design of bifunctional catalysts with high performance and low platinum for the oxygen reduction reaction (ORR) and the methanol oxidation reaction (MOR) is of significant implication to promote the industrialization of fuel cells. In our work, Pt/carbon nanotube (CNT), Pt3Ru/CNT, and PtRu/CNT catalysts were synthesized by plasma heat treatment, in which the pyrolysis reduction of organometallic salts and the dispersion of CNTs were achieved simultaneously, and catalytic nanoparticles with uniform particle size were anchored on the dispersed CNT surface. Later, Fe was further introduced, and PtFe/CNT, Pt3RuFe/CNT, and PtRuFe/CNT catalysts were synthesized by calcination, and the structure and electrochemical properties in both MOR and ORR of all as-synthesized catalysts were investigated. The results indicated that plasma thermal treatment has the advantage of rapidness and immediacy in the synthesis of catalysts, and the Pt/CNT, Pt3Ru/CNT, and PtRu/CNT catalysts exhibited better electrocatalytic properties than commercial platinum (JM-Pt/C) catalysts. Meanwhile, the introduction of Fe during the calcination further changed the surface electronic properties of catalytic nanoparticles and enhanced the graphitization degree of catalysts; the PtRuFe/CNT catalyst exhibited outstanding electrocatalytic properties with a mass activity of 834.3 mA mg–1 for MOR and a half-wave potential of 0.928 V in alkaline media for ORR. The combination of plasma thermal treatment and calcination puts forward a novel strategy for the optimization of catalysts, and the synthesis method based on plasma dispersion needs to be further optimized to achieve its large-scale promotion.

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Section: Resultscontrasting

confidence: 58%

Section: ■ Results and Discussionmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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PtRuFe/Carbon Nanotube Composites as Bifunctional Catalysts for Efficient Methanol Oxidation and Oxygen Reduction

Zhang

Tang

2023

Langmuir

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“…The multi-walled CNTs and acetone-functionalized CNTs (A-CNTs) have become a highly potent candidate to be used as the filler in composite materials owing to their high aspect ratio, high active surface area, and extraordinary mechanical characteristics. The CNTs have been used for various applications in potent areas such as rubber/polymer/metal composites, − sensing, , biomedical, catalysts, and energy storage and strength. − The nanocomposites with CNT reinforcement yield superior specific properties like high strength-to-weight and high stiffness-to-weight ratios. However, CNTs have strong tendency to form aggregates in solution.…”

Section: Introductionmentioning

confidence: 99%

Bisphenol-A–Carbon Nanotube Nanocomposite: Interfacial DFT Prediction and Experimental Strength Testing

Bansal¹,

Singh

et al. 2023

Langmuir

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Epoxies, their derivatives, and composites, due to superior specific strength, are preferred for many potential applications in the field of automobiles, aircraft, bonding of structures, protective coatings, water filtration, etc. As structural members in automobiles and aircraft, the epoxy-based components are exposed to various static/dynamic mechanical loading conditions during their service life. The interfacial interactions, between the matrix and reinforcement, greatly affect the final properties of the composites. The present study demonstrates that the solvent used for the preparation of the composite can also contribute toward interfacial interactions. Present research systematically finds out a suitable solvent (acetone) and reinforcement type [multi-walled carbon nanotube (CNT)] for epoxy [bisphenol-A (BPA)] nanocomposites. Dynamic and static strengths of the as-prepared epoxy–CNT nanocomposites were carefully investigated. Well dispersed CNTs in acetone were mixed with an ester of BPA under constant magnetic stirring conditions. Samples of tablet shape were prepared for testing static and dynamic performance of the composite using a nano-indentation technique. Considerable enhancement by 55 and 22% in the static elastic modulus and hardness of BPA–CNT composites, respectively, was observed (compared with that of pristine BPA). The storage modulus and tan-delta of the nanocomposites were also improved by 14 and 46%, respectively. Improved static and dynamic performance, reported in this work, significantly enhances the scope of utilization of BPA–CNT-based nanocomposites under severe static and dynamic loading conditions simultaneously. Static and dynamical analysis of CNT-reinforced epoxy provides more realistic understanding of the mechanical performance of the nanocomposite. Density functional theory (using QuantumATK software) simulations were performed to investigate and identify the alterations in the atomic morphology of CNTs during interfacial interaction with the acetone molecule and epoxy matrix. The calculations predicted that CNTs with mild defects as compared to pristine CNTs were better suited for synthesis of the nanocomposite and also assisted in a homogeneous distribution of CNTs in BPA without aggregation (with acetone as the solvent). Furthermore, structural changes in CNTs after treatment with BPA and the curing agent and the role of defects are studied in detail.

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Tailoring the Chemisorption Manner of Fe d‐Band Center with La₂O₃ for Enhanced Oxygen Reduction in Anion Exchange Membrane Fuel Cells

Li,

Zhang,

Zhang

et al. 2023

Adv Funct Materials

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Engineering the electronic configuration and intermediates adsorption behaviors of high‐performance non‐noble‐metal‐based catalysts for the sluggish oxygen reduction reaction (ORR) kinetics at the cathode is highly imperative for the development of anion exchange membrane fuel cells (AEMFCs), yet remains an enormous challenge. Herein, a rare‐earth metal oxide engineering tactic through the formation of Fe3O4/La2O3 heterostructures in N,O‐doped carbon nanospheres (Fe3O4/La2O3@N,O‐CNSs) for efficient oxygen reduction electrocatalysis is reported. The theoretical calculations reveal that the interfacial bonds formed by the La─O─Fe heterogeneous interface effectively optimize the electronic structure of the Fe d‐band center relative to the Fermi level, which results in a significant reduction of the reaction barriers of rate‐limiting steps during the ORR. The modulation in intermediates chemisorption enables Fe3O4/La2O3@N,O‐CNSs an outstanding ORR performance and improved stability, with a significantly higher half‐wave potential value (0.88 V). More impressively, this integrated catalyst delivers a remarkable power density of 148.7 mW cm−2 in practical AEMFC operating conditions, along with negligible performance degradation over 100 h using an H2‐air atmosphere, which is higher than commercial Pt/C‐coupled electrodes. The results presented here are believed to provide guidelines for fabricating high‐performance AEMFCs electrocatalysts in terms of heterointerface engineering and strong electronic coupling effect induced by rare‐earth oxides.

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Efficient Synthesis of Fe/N-Doped Carbon Nanotube as Highly Active Catalysts for Oxygen Reduction Reaction in Alkaline Media

Cited by 15 publications

References 51 publications

PtRuFe/Carbon Nanotube Composites as Bifunctional Catalysts for Efficient Methanol Oxidation and Oxygen Reduction

PtRuFe/Carbon Nanotube Composites as Bifunctional Catalysts for Efficient Methanol Oxidation and Oxygen Reduction

Bisphenol-A–Carbon Nanotube Nanocomposite: Interfacial DFT Prediction and Experimental Strength Testing

Tailoring the Chemisorption Manner of Fe d‐Band Center with La₂O₃ for Enhanced Oxygen Reduction in Anion Exchange Membrane Fuel Cells

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Efficient Synthesis of Fe/N-Doped Carbon Nanotube as Highly Active Catalysts for Oxygen Reduction Reaction in Alkaline Media

Cited by 15 publications

References 51 publications

PtRuFe/Carbon Nanotube Composites as Bifunctional Catalysts for Efficient Methanol Oxidation and Oxygen Reduction

PtRuFe/Carbon Nanotube Composites as Bifunctional Catalysts for Efficient Methanol Oxidation and Oxygen Reduction

Bisphenol-A–Carbon Nanotube Nanocomposite: Interfacial DFT Prediction and Experimental Strength Testing

Tailoring the Chemisorption Manner of Fe d‐Band Center with La2O3 for Enhanced Oxygen Reduction in Anion Exchange Membrane Fuel Cells

Contact Info

Product

Resources

About

Tailoring the Chemisorption Manner of Fe d‐Band Center with La₂O₃ for Enhanced Oxygen Reduction in Anion Exchange Membrane Fuel Cells