Hollow cobalt phosphide octahedral pre-catalysts with exceptionally high intrinsic catalytic activity for electro-oxidation of water and methanol

Xu, Junyuan; Liu, Yuefeng; Li, Junjie; Amorim, Isilda; Zhang, Bingsen; Xiong, Dehua; Zhang, Nan; Thalluri, Sitaramanjaneya Mouli; Sousa, Juliana P. S.; Liu, Lifeng

doi:10.1039/c8ta07958g

Cited by 96 publications

(80 citation statements)

References 70 publications

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“…The diameters of the semicircles are observed to decrease with the increase in applied potential due to an increase in the charge transfer kinetics during MOR and are shown in Figure . This observation supports the improved charge transfer kinetics to the adsorbed reactant that facilitates MOR reaction for nanoflowers than nanoparticles …”

Section: Resultssupporting

confidence: 74%

Highly Active and Easily Fabricated NiCo₂O₄ Nanoflowers for Enhanced Methanol Oxidation

Faid

Ismail

2019

ChemistrySelect

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Metal oxides with tailored nanomorphology represent a powerful tool to improve the electrocatalytic activity. Herein NiCo2O4 nanoflowers were synthesized via facile microwave method. NiCo2O4 nanoflowers were characterized by scanning and transmission electron microscopy, X‐ray diffraction (XRD), Raman spectroscopy, N2 gas adsorption/desorption, and X‐ray photoelectron spectroscopy (XPS). Through comparing NiCo2O4 nanoparticle vs nanoflowers morphology, NiCo2O4 nanoflowers have a superior mass and specific electroactivity towards oxygen evolution reaction (OER) by achieving a current density of 10 mA/cm2 at an overpotential of only 280 mV in 1M KOH electrolyte. Moreover, NiCo2O4 nanoflowers display superior performance for methanol electrooxidation in fuel cells by achieving 200 A/g and recovers 92.3 % of the original activity through the addition of new (1M KOH + 0.5M methanol) electrolyte after 500 cycles.

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Section: Resultssupporting

confidence: 74%

Highly Active and Easily Fabricated NiCo₂O₄ Nanoflowers for Enhanced Methanol Oxidation

Faid

Ismail

2019

ChemistrySelect

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“…The development of modern society depends on energy supply to a large extent, but with environmental problems induced by the burning of fossil fuels and the aggravation of energy shortage, it is necessary to find new conversion systems or renewable energy [1][2][3][4]. Fuel cells and metal-air batteries are considered to be promising energy systems; however, their poor energy conversion efficiency and short life span are the main bottlenecks that limit their widespread use [5][6][7][8][9]. These deficiencies are primarily on account of the inherent sluggish kinetics of the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Co/CoP Nanoparticles Encapsulated Within N, P-Doped Carbon Nanotubes on Nanoporous Metal-Organic Framework Nanosheets for Oxygen Reduction and Oxygen Evolution Reactions

Yang

Ren

et al. 2020

Nanoscale Res Lett

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Herein, Co/CoP nanoparticles encapsulated with N, P-doped carbon nanotubes derived from the atomic layer deposited hexagonal metal-organic frameworks (MOFs) are obtained by calcinations and subsequent phosphating and are employed as electrocatalyst. The electrocatalytic performance evaluations show that the as-prepared electrocatalyst exhibits an overpotential of 342 mV at current density of 10 mA cm −2 and the Tafel slope of 74 mV dec −1 for oxygen evolution reaction (OER), which is superior to the most advanced ruthenium oxide electrocatalyst. The electrocatalyst also shows better stability than the benchmark RuO 2. After 9 h, the current density is only decreased by 10%, which is far less than the loss of RuO 2. Moreover, its onset potential for oxygen reduction reaction (ORR) is 0.93 V and follows the ideal 4-electron approach. After the stability test, the current density of the electrocatalyst retains 94% of the initial value, which is better than Pt/C. The above results indicate that the electrocatalyst has bifunctional activity and excellent stability both for OER and ORR. It is believed that this strategy provides guidance for the synthesis of cobalt phosphide/carbon-based electrocatalysts.

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“…Stemming from the different diffusion rates of iron and phosphorus at high temperature, the interdiffusion of P and Fe can be balanced as a result of vacancies . When these inner vacancies accumulate to a certain level, they tend to coalesce into voids inside the particles, and eventually the void‐containing P−Fe 3 O 4 (Figure S1c) was formed due to the well‐known Kirkendall effect …”

Section: Resultsmentioning

confidence: 99%

Phosphorization‐Induced Void‐Containing Fe₃O₄ Nanoparticles Enabling Low Lithiation/Delithiation Potential for High‐Performance Lithium‐Ion Batteries

Nie

Zhang

et al. 2019

ChemElectroChem

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In terms of Fe 3 O 4 -based anodes, enormous academic progress has been achieved over the past two decades; however, even with excellent half-cell performance, the relatively high lithiation potential and unsatisfactory initial coulombic efficiency (ICE) represent two major barriers to their commercial application, at present. We propose partially phosphorized Fe 3 O 4 (PÀ Fe 3 O 4 ) with interior void spaces induced by phosphorization to enhance the Li + storage property of Fe 3 O 4 -based anodes. PÀ Fe 3 O 4 anodes offer a much higher capacity at low potential compared with bare Fe 3 O 4 electrodes. Additionally, the welldesigned nanostructure with preferable specific surface area prevents the initial irreversible lithium loss, which contributes to a brilliant ICE (80.8 % at 100 mA g À 1 ). Moreover, in-situ X-ray diffraction proves that the formation of the Li x Fe 3 O 4 phase results from an initial intercalation process. In particular, the output voltage and energy density of PÀ Fe 3 O 4 full-cells are much greater than those of Fe 3 O 4 full-cells. In this work, the PÀ Fe 3 O 4 full-cell exhibits a capacity of 680 mAh g À 1 at 200 mA g À 1 as well as an excellent rate capability of 267 mAh g À 1 with a current density up to 1000 mA g À 1 . This study presents a new strategy to enhance Li + storage of Fe 3 O 4 enabling low lithiation/delithiation potential and high ICE, which may offer exciting opportunities toward designing highperformance full-cells with commercial cathodes.

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Hollow cobalt phosphide octahedral pre-catalysts with exceptionally high intrinsic catalytic activity for electro-oxidation of water and methanol

Abstract: Hollow CoP octahedral nanoparticles have been prepared, and they show exceptionally high intrinsic activity for both the oxygen evolution and methanol oxidation reactions.

Cited by 96 publications

References 70 publications

Highly Active and Easily Fabricated NiCo₂O₄ Nanoflowers for Enhanced Methanol Oxidation

Highly Active and Easily Fabricated NiCo₂O₄ Nanoflowers for Enhanced Methanol Oxidation

Co/CoP Nanoparticles Encapsulated Within N, P-Doped Carbon Nanotubes on Nanoporous Metal-Organic Framework Nanosheets for Oxygen Reduction and Oxygen Evolution Reactions

Phosphorization‐Induced Void‐Containing Fe₃O₄ Nanoparticles Enabling Low Lithiation/Delithiation Potential for High‐Performance Lithium‐Ion Batteries

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Hollow cobalt phosphide octahedral pre-catalysts with exceptionally high intrinsic catalytic activity for electro-oxidation of water and methanol

Abstract: Hollow CoP octahedral nanoparticles have been prepared, and they show exceptionally high intrinsic activity for both the oxygen evolution and methanol oxidation reactions.

Cited by 96 publications

References 70 publications

Highly Active and Easily Fabricated NiCo2O4 Nanoflowers for Enhanced Methanol Oxidation

Highly Active and Easily Fabricated NiCo2O4 Nanoflowers for Enhanced Methanol Oxidation

Co/CoP Nanoparticles Encapsulated Within N, P-Doped Carbon Nanotubes on Nanoporous Metal-Organic Framework Nanosheets for Oxygen Reduction and Oxygen Evolution Reactions

Phosphorization‐Induced Void‐Containing Fe3O4 Nanoparticles Enabling Low Lithiation/Delithiation Potential for High‐Performance Lithium‐Ion Batteries

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Highly Active and Easily Fabricated NiCo₂O₄ Nanoflowers for Enhanced Methanol Oxidation

Highly Active and Easily Fabricated NiCo₂O₄ Nanoflowers for Enhanced Methanol Oxidation

Phosphorization‐Induced Void‐Containing Fe₃O₄ Nanoparticles Enabling Low Lithiation/Delithiation Potential for High‐Performance Lithium‐Ion Batteries