Co(<scp>ii</scp>)-porphyrin-decorated carbon nanotubes as catalysts for oxygen reduction reactions: an approach for fuel cell improvement

Sonkar, Piyush Kumar; Prakash, Kamal; Yadav, Mamta; Ganesan, Vellaichamy; Sankar, Muniappan; Gupta, Rupali; Yadav, Dharmendra Kumar

doi:10.1039/c6ta10482g

Cited by 126 publications

(106 citation statements)

References 75 publications

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“…For comparison, the ORR catalytic activity of the commercial Pt/C 20 wt% was also analyzed under the same experimental condition. Comparably, the polarization curves of NiCoP/CNF800, NiCoP/CNF700, pristine CNF, and NiCoP obtained at various rotation speeds and their respective K-L plots are given in (Figures S7-S11, Supporting Information) based on the below relations [64] 1 1 1 The E 1/2 potential and limited diffusion current density of NiCoP/CNF900 are 0.82 V and 7.16 mA cm −2 , respectively, which is higher than the NiCoP/CNF800 (0.80 V and 5.10 mA cm −2 ), NiCoP/CNF700 (0.77 V and 3.69 mA cm −2 ), pristine CNF (0.74 V and 3 mA cm −2 ), and NiCoP (0.75 V and 2.65 mA cm −2 ).…”

Section: Oxygen Reduction Reactionmentioning

confidence: 99%

Electrospun Carbon Nanofibers Encapsulated with NiCoP: A Multifunctional Electrode for Supercapattery and Oxygen Reduction, Oxygen Evolution, and Hydrogen Evolution Reactions

Surendran

Shanmugapriya

Sivanantham

et al. 2018

Advanced Energy Materials

276

148

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Functionalizing nanostructured carbon nanofibers (CNFs) with bimetallic phosphides enables the material to become an active electrode for multifunctional applications. A facile electrospinning technique is utilized for the first time to develop NiCoP nanoparticles encapsulated CNFs that are used as an energy storage system of supercapattery, and as an electrocatalyst for oxygen reduction, oxygen evolution, and hydrogen evolution reaction in KOH electrolyte. Evolving from the inclusion of bimetallic phosphide nanoparticles, the NiCoP/CNF electrode unveils superior‐specific capacitance (333 Fg−1 at 2 Ag−1) and rate capability (87%). The fabricated supercapattery device offers a voltage of 1.6 V that supplies a remarkable energy density (36 Wh kg−1) along with an improved power density (4000 W kg−1) and unwavering cyclic stability (25 000 cycles). Meanwhile, the NiCoP/CNF electrode has simultaneously performed well as a multifunctional electrocatalyst for oxygen reduction reaction at a half‐wave potential of 0.82 V versus reversible hydrogen electrode and can attain a current density of 10 mA cm−2 at a very low overpotential of 268 and 130 mV for the oxygen evolution reaction and hydrogen evolution reaction, respectively. Thus, the NiCoP/CNF with all its inimitable electrode properties has profoundly proved its proficiency at handling multifunctional challenges in terms of both storage and conversion.

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Section: Oxygen Reduction Reactionmentioning

confidence: 99%

Electrospun Carbon Nanofibers Encapsulated with NiCoP: A Multifunctional Electrode for Supercapattery and Oxygen Reduction, Oxygen Evolution, and Hydrogen Evolution Reactions

Surendran

Shanmugapriya

Sivanantham

et al. 2018

Advanced Energy Materials

276

148

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“…Metalloporphyrins, a family of interesting compounds, have attracted great attention in fields of light harvesters and biocatalysts . More and more metalloporphyrin‐based porous materials have been used as precursors for ORR catalysts because of their high surface area and framework stability as well as active site insertion from the macrocyclic effect of porphyrin .…”

Section: Introductionmentioning

confidence: 99%

Hyperporous‐Carbon‐Supported Nonprecious Metal Electrocatalysts for the Oxygen Reduction Reaction

Zhai

Xuan

Xu³

et al. 2018

Chemistry An Asian Journal

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Highly porous carbonaceous nonprecious metal catalysts for the oxygen reduction reaction are prepared by carbonization of low-cost metalloporphyrin-based hyper-crosslinked polymers (MPH-X). With high surface area (2768 m g ), hierarchical porous structure, and high metal loading (9.97 wt %), the obtained hyperporous carbon MPH-Fe/C catalyst exhibits high oxygen reduction reaction (ORR) activity with a half-wave potential (0.816 V) that is comparable to the 0.819 V of commercial Pt/C. Stability tests reveal that MPH-Fe/C also exhibits outstanding long-term durability and methanol tolerance. Our findings may offer an alternative approach to produce nonprecious metal ORR catalysts on a large scale owing to the low-cost MPH-X precursors with diverse metal types.

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“…The electrochemical properties of the catalysts were evaluated with an Autolab 302 N potentiostat/galvanostat in 0.1 m KOH by cyclic voltammetry (CV) and linear sweep voltammetry (LSV). ZIF‐CB‐700 showed a higher onset potential of ORR (0.96 V vs. RHE, Figure S8 b), which was also verified by CV tests in N 2 ‐ and O 2 ‐saturated 0.1 m KOH (Figure S8 c) . During rotating ring‐disk electrode (RRDE) measurements (Figure S8 d), ZIF‐CB‐700 exhibited a higher electron‐transfer number ( n =3.85–3.96, Figure S8 e) and lower H 2 O 2 yield (below 7 %) than catalysts pyrolyzed at higher temperatures.…”

Section: Figurementioning

confidence: 99%

Hierarchically Porous Co−N−C Cathode Catalyst Layers for Anion Exchange Membrane Fuel Cells

et al. 2019

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As a new class of metal–nitrogen–carbon (M−N−C) material with 3 D microstructure, zeolitic imidazolate frameworks (ZIFs) are used to synthesize highly active electrocatalysts for the oxygen reduction reaction, as substitutes for commercial Pt/C in anion exchange membrane fuel cells. However, to form an effective catalyst layer (CL), the relationship between the microstructure of the ZIF‐derived catalyst and the fuel cell performance must be investigated. In this work, a hierarchically porous CL based on the carbon black (CB)‐controlled synthesis of a Co‐based ZIF (denoted as ZIF‐CB‐700) is constructed to optimize the triple‐phase boundary (TPB) and mass transfer. The power density at 40 °C of ZIF‐CB‐700 (95.4 mW cm−2) as cathode catalyst is about 4 times higher than that of the catalyst synthesized in the absence of CB and is comparable to that of the commercial 60 % Pt/C catalyst (112.0 mW cm−2). Both online and offline measurements suggest that the morphology and microstructure of the CL is crucial to form an active TPB region, dominating the fuel cell performance rather than only the high catalyst activity.

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Co(ii)-porphyrin-decorated carbon nanotubes as catalysts for oxygen reduction reactions: an approach for fuel cell improvement

Abstract: Functionalized cobalt porphyrin immobilized multiwalled carbon nanotubes are synthesized and characterized. These new materials efficiently electrocatalyze oxygen reduction and they have potential to replace conventional Pt–C catalyst in fuel cells.

Cited by 126 publications

References 75 publications

Electrospun Carbon Nanofibers Encapsulated with NiCoP: A Multifunctional Electrode for Supercapattery and Oxygen Reduction, Oxygen Evolution, and Hydrogen Evolution Reactions

Electrospun Carbon Nanofibers Encapsulated with NiCoP: A Multifunctional Electrode for Supercapattery and Oxygen Reduction, Oxygen Evolution, and Hydrogen Evolution Reactions

Hyperporous‐Carbon‐Supported Nonprecious Metal Electrocatalysts for the Oxygen Reduction Reaction

Hierarchically Porous Co−N−C Cathode Catalyst Layers for Anion Exchange Membrane Fuel Cells

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