Influence of Ni to Co ratio in mixed Co and Ni phosphides on their electrocatalytic oxygen evolution activity

Barwe, Stefan; Andronescu, Corina; Vasile, Eugeniu; Masa, Justus; Schuhmann, Wolfgang

doi:10.1016/j.elecom.2017.04.014

Cited by 26 publications

(11 citation statements)

References 27 publications

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“…Therefore it is assumed that high intrinsic (specific) OER activity of NiCo 2 O 4 nanoflowers results from their unique morphology where more catalytically active sites are exposed, and better mass transport can be achieved. NiCo 2 O 4 nanoflowers provides an intrinsic activity for OER substantially superior to the literature summarized in Table S1 Tafel plot is obtained in Figure S4. NiCo 2 O 4 nanoflowers have a Tafel slope of 50 mV/dec which is lower than obtained for NiCo 2 O 4 nanoparticles (70 mV/dec) which confirms the rapid OER kinetics for the nanoflower morphology …”

Section: Resultsmentioning

confidence: 78%

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: Resultsmentioning

confidence: 78%

Highly Active and Easily Fabricated NiCo₂O₄ Nanoflowers for Enhanced Methanol Oxidation

Faid

Ismail

2019

ChemistrySelect

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“…To this end, alloys of cobalt with boron, silicon, phosphorus, arsenic and tellurium were screened for their electrocatalytic activity for HMF oxidation. A detailed synthetic procedure to afford cobalt boride (CoB) and cobalt phosphide (CoP) was published previously together with a detailed material characterization [ 30 – 33 ]. CoAs as well as CoTe was synthesized at 1100 °C from the elements in sealed glass ampules.…”

Section: Resultsmentioning

confidence: 99%

Cobalt–metalloid alloys for electrochemical oxidation of 5-hydroxymethylfurfural as an alternative anode reaction in lieu of oxygen evolution during water splitting

Weidner

Barwe

Sliozberg

et al. 2018

Beilstein J. Org. Chem.

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The electrochemical water splitting commonly involves the cathodic hydrogen and anodic oxygen evolution reactions (OER). The oxygen evolution reaction is more energetically demanding and kinetically sluggish and represents the bottleneck for a commercial competitiveness of electrochemical hydrogen production from water. Moreover, oxygen is essentially a waste product of low commercial value since the primary interest is to convert electrical energy into hydrogen as a storable energy carrier. We report on the anodic oxidation of 5-hydroxymethylfurfural (HMF) to afford the more valuable product 2,5-furandicarboxylic acid (FDCA) as a suitable alternative to the oxygen evolution reaction. Notably, HMF oxidation is thermodynamically more favorable than water oxidation and hence leads to an overall improved energy efficiency for H2 production. In addition, contrary to the “waste product O2”, FDCA can be further utilized, e.g., for production of polyethylene 2,5-furandicarboxylate (PEF), a sustainable polymer analog to polyethylene terephthalate (PET) and thus represents a valuable product for the chemical industry with potential large scale use. Various cobalt–metalloid alloys (CoX; X = B, Si, P, Te, As) were investigated as potential catalysts for HMF oxidation. In this series, CoB required 180 mV less overpotential to reach a current density of 55 mA cm−2 relative to OER with the same electrode. Electrolysis of HMF using a CoB modified nickel foam electrode at 1.45 V vs RHE achieved close to 100% selective conversion of HMF to FDCA at 100% faradaic efficiency.

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“…Mixed-metal compounds including oxides,s ulfides,p hosphides,a nd hydroxides have been demonstrated to have enhanced performances for various energy-conversion applications compared to their single-metal counterparts because of the synergistic effect between the different metals. [73][74][75][76][77][78][79] MOFs with uniformly dispersed mixed-metal sites can be facilely synthesized using mixed-metal salts as precursors,and the synergistic effects between the different metal sites can greatly boost the energy-conversion performance of MOFs. Fore xample,W ang et al reported that ab imetallic Ni/Fe MOF,N i/Fe-BTC (BTC = 1,3,5-benzenetricarboxylic acid), showed am uch greater electrocatalytic OER performance than the monometallic MOF counterparts in terms of overpotentials at 10 mA cm À2 and Tafel slopes.…”

Section: Mixed-metal Sitesmentioning

confidence: 99%

Atomically Dispersed Metal Sites in MOF‐Based Materials for Electrocatalytic and Photocatalytic Energy Conversion

et al. 2018

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Metal sites play an essential role in both electrocatalytic and photocatalytic energy conversion. The highly ordered arrangements of the organic linkers and metal nodes as well as the well-defined pore structures of metal-organic frameworks (MOFs) make them ideal substrates to support atomically dispersed metal sites (ADMSs) located in their metal nodes, linkers, and pores. Porous carbon materials doped with ADMSs can be derived from these ADMS-incorporating MOF precursors through controlled treatments. These ADMSs incorporated in pristine MOFs and MOF-derived carbon materials possess unique advantages over molecular or bulk metal-based catalysts and bridge the gap between homogeneous and heterogeneous catalysts for energy-conversion applications. This Review presents recent progress in the design and incorporation of ADMSs in MOFs and MOF-derived materials for energy-conversion applications.

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Influence of Ni to Co ratio in mixed Co and Ni phosphides on their electrocatalytic oxygen evolution activity

Cited by 26 publications

References 27 publications

Highly Active and Easily Fabricated NiCo₂O₄ Nanoflowers for Enhanced Methanol Oxidation

Highly Active and Easily Fabricated NiCo₂O₄ Nanoflowers for Enhanced Methanol Oxidation

Cobalt–metalloid alloys for electrochemical oxidation of 5-hydroxymethylfurfural as an alternative anode reaction in lieu of oxygen evolution during water splitting

Atomically Dispersed Metal Sites in MOF‐Based Materials for Electrocatalytic and Photocatalytic Energy Conversion

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Influence of Ni to Co ratio in mixed Co and Ni phosphides on their electrocatalytic oxygen evolution activity

Cited by 26 publications

References 27 publications

Highly Active and Easily Fabricated NiCo2O4 Nanoflowers for Enhanced Methanol Oxidation

Highly Active and Easily Fabricated NiCo2O4 Nanoflowers for Enhanced Methanol Oxidation

Cobalt–metalloid alloys for electrochemical oxidation of 5-hydroxymethylfurfural as an alternative anode reaction in lieu of oxygen evolution during water splitting

Atomically Dispersed Metal Sites in MOF‐Based Materials for Electrocatalytic and Photocatalytic Energy Conversion

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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