Covalent organic polymers derived carbon incorporated with cobalt oxides as a robust oxygen reduction reaction catalyst for fuel cells

Yang, Wei; Li, Jun; Lan, Linghan; Zhang, Yudong; Liu, Hongtao

doi:10.1016/j.cej.2020.124581

Cited by 25 publications

(11 citation statements)

References 34 publications

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“…[17][18][19] During ORR, O 2 can also be reduced to H 2 O with 4e À process (4e-ORR), which decreases H 2 O 2 yield greatly. [20][21][22][23][24][25] The selectivity towards H 2 O 2 depends on the binding energy between electrocatalyst and OOH*. [26][27][28] In detail, low binding energy facilitates 2e-ORR and generates H 2 O 2 , while high binding energy favors 4e-ORR, which leads to breaking of OÀ O bond and produces H 2 O.…”

Section: Introductionmentioning

confidence: 99%

Structural Modulation on NiCo₂S₄Nanoarray by N Doping to Enhance 2e‐ORR Selectivity for Photothermal AOPs and Zn−O₂Batteries**

Yin

et al. 2021

Chemistry A European J

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As a H2O2 generator, a 2e− oxygen reduction reaction active electrocatalyst plays an important role in the advanced oxidation process to degrade organic pollutants in sewage. To enhance the tendency of NiCo2S4 towards the 2e− reduction reaction, N atoms are doped in its structure and replace S2−. The result implies that this weakens the interaction between NiCo2S4 and OOH*, suppresses O−O bond breaking and enhances H2O2 selectivity. This electrocatalyst also shows photothermal effect. Under photothermal heating, H2O2 produced by the oxidation reduction reaction can decompose and releaseOH, which degrades organic pollutants through the advanced oxidation process. Photothermal effect induced by the advance oxidation process shows obvious advantages over the traditional Fenton reaction, such as wide pH adaptation scope and low secondary pollutant due to its Fe2+ free character. With Zn as anode and the electrocatalyst as cathode material, a Zn−O2 battery is assembled. It achieves electricity generation and photothermal effect induced by the advance oxidation process simultaneously.

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Section: Introductionmentioning

confidence: 99%

Structural Modulation on NiCo₂S₄Nanoarray by N Doping to Enhance 2e‐ORR Selectivity for Photothermal AOPs and Zn−O₂Batteries**

Yin

et al. 2021

Chemistry A European J

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“…FCs are considered an effective method for the conversion of different renewable such as hydrogen, methanol, ethanol, and urea. Despite the several advantages of the FCs, the high cost of the Pt, its limited resources, and low stability are some major challenges facing the commercialization of FCs, especially those working at low temperatures 13,14 . Fuel crossover from the anode side to the cathode side is another challenge that specifically faces the commercialization of low temperature, direct alcoholic FCs 15‐17 .…”

Section: Introductionmentioning

confidence: 99%

“…Despite the several advantages of the FCs, the high cost of the Pt, its limited resources, and low stability are some major challenges facing the commercialization of FCs, especially those working at low temperatures. 13,14 Fuel crossover from the anode side to the cathode side is another challenge that specifically faces the commercialization of low temperature, direct alcoholic FCs. [15][16][17] Fuel crossover not only results in the depletion of fuel usage (and thus lower efficiency) but also diminishes the cell voltage, due to the mixed potential at the cathode.…”

Section: Introductionmentioning

confidence: 99%

Co‐decorated reduced graphene/titanium nitride composite as an active oxygen reduction reaction catalyst with superior stability

Al‐Dhaifallah¹,

Abdelkareem

Rezk

et al. 2020

Int J Energy Res

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Summary Preparing a cost‐effective, active, stable, non‐precious catalyst, especially at the cathode, is one of the basic requirements for the commercialization of fuel cells (FCs). In this study, cobalt nanoparticles composite with titanium nitride (TiN) were prepared on the surface of reduced graphene oxide, using a facile hydrothermal method, followed by heat treatment under an inert atmosphere. The surface morphology, surface composition, and crystalline structure are investigated with the use of field emission‐scanning electron microscopy, X‐ray photoelectron spectroscopy, and X‐ray diffraction, respectively. The oxygen reduction reaction (ORR) activity is examined in sulfuric acid (0.5 M H2SO4), under nitrogen and oxygen bubbling. Results showed that there is an optimum ratio of the Co and the TiN that maximizes the ORR activity. A high onset potential of 0.926 V vs Ag/AgCl is obtained in the case of CoTiN (30)/Gr. This is much higher than that of commercial Pt/C catalyst (0.576 V vs Ag/AgCl). The prepared catalyst has no activity towards methanol oxidation, unlike the Pt/C catalyst. Thus, it considered a promising cathode catalyst for direct alcoholic FCs. Furthermore, the composite catalyst has a high stability, with no activity degradation occurring even after 1000 cycles. This is extremely effective compared to the 20% loss of Pt/C activity under the same operating conditions. The high performance of the prepared catalyst is related to the synergetic effect between the TiN and the Cobalt.

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“…In the last few decades, covalent organic polymers (COPs) have shown great potential in electrocatalysis by reason of their high structural regularity, modular properties, large surface areas, and rich elemental composition. − By atomically precise integration of precursors through covalent bonds, COPs have the advantages of designable structures with different species of active sites as well as sufficient structural stability in acidic or alkaline media. ,− However, most COPs have to undergo the pyrolysis process before being employed as ORR catalysts owing to their poor electrical conductivity. − Besides, the densely stacked COP layers in bulk materials are usually detrimental to mass transfer and the availability of active sites. Herein, we have successfully synthesized a novel bimetal phthalocyanine covalent organic polymer/ordered mesoporous carbon (CoFe-COP/OMC) hybrid catalyst via a pyrolysis-free approach (Scheme ).…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis-Free Synthesis of Bimetal Phthalocyanine Covalent Organic Polymers/Ordered Mesoporous Carbon Nanocomposites for an Efficient Oxygen Reduction Reaction

Mo,

Liu,

Liu

et al. 2023

ACS Appl. Nano Mater.

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The development of non-noble metal−nitrogen ring complex (M−N− C) catalysts with high activity and stability for the oxygen reduction reaction (ORR) is of great significance. However, M−N−C catalysts are generally prepared from precursors under high-temperature pyrolysis, which leads to complex product structures and makes it difficult to identify the catalytic active center. Herein, we have successfully structured a novel bimetal phthalocyanine covalent organic polymer/ordered mesoporous carbon (CoFe-COP/OMC) electrocatalyst through a pyrolysis-free approach. Due to the well-defined active sites (Fe/CoN 4 ), ordered COP structure, and highly conductive carrier materials, the CoFe-COP/OMC nanocomposite exhibits remarkable ORR electrocatalytic activity with a half-wave potential and initial potential of 0.908 and 0.932 V (vs reversible hydrogen electrode (RHE)), respectively, a limiting current density of 5.35 mA cm −2 , and a nearly four-electron reduction pathway. In addition, the acquired hybrid catalysts show excellent methanol resistance and electrochemical stability compared with Pt/C. The outstanding performance confirms that the CoFe-COP/OMC nanocomposite is a promising high-efficiency ORR catalyst for metal−air batteries and fuel cells.

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Covalent organic polymers derived carbon incorporated with cobalt oxides as a robust oxygen reduction reaction catalyst for fuel cells

Cited by 25 publications

References 34 publications

Structural Modulation on NiCo₂S₄Nanoarray by N Doping to Enhance 2e‐ORR Selectivity for Photothermal AOPs and Zn−O₂Batteries**

Structural Modulation on NiCo₂S₄Nanoarray by N Doping to Enhance 2e‐ORR Selectivity for Photothermal AOPs and Zn−O₂Batteries**

Co‐decorated reduced graphene/titanium nitride composite as an active oxygen reduction reaction catalyst with superior stability

Pyrolysis-Free Synthesis of Bimetal Phthalocyanine Covalent Organic Polymers/Ordered Mesoporous Carbon Nanocomposites for an Efficient Oxygen Reduction Reaction

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Covalent organic polymers derived carbon incorporated with cobalt oxides as a robust oxygen reduction reaction catalyst for fuel cells

Cited by 25 publications

References 34 publications

Structural Modulation on NiCo2S4Nanoarray by N Doping to Enhance 2e‐ORR Selectivity for Photothermal AOPs and Zn−O2Batteries**

Structural Modulation on NiCo2S4Nanoarray by N Doping to Enhance 2e‐ORR Selectivity for Photothermal AOPs and Zn−O2Batteries**

Co‐decorated reduced graphene/titanium nitride composite as an active oxygen reduction reaction catalyst with superior stability

Pyrolysis-Free Synthesis of Bimetal Phthalocyanine Covalent Organic Polymers/Ordered Mesoporous Carbon Nanocomposites for an Efficient Oxygen Reduction Reaction

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Structural Modulation on NiCo₂S₄Nanoarray by N Doping to Enhance 2e‐ORR Selectivity for Photothermal AOPs and Zn−O₂Batteries**

Structural Modulation on NiCo₂S₄Nanoarray by N Doping to Enhance 2e‐ORR Selectivity for Photothermal AOPs and Zn−O₂Batteries**