Electrocatalytic activity of nickel oxide nanoparticles-modified electrodes: Optimization of the loading level and operating pH towards the oxygen evolution reaction

Sadiek, Ibrahim; Mohammad, Ahmad M.; Elshakre, Mohamed E.; El‐Deab, Mohamed S.

doi:10.1016/j.ijhydene.2011.09.097

Cited by 93 publications

(59 citation statements)

References 34 publications

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“…The values of ε are 6.3× 10 −3 and 3.4×10 −3 for Ni electrodeposited for 4 and 8 min, respectively [25]. Thus, one might conclude that not all the deposited nickel is converted into Ni oxide, but only a few monolayers.…”

Section: Effect Of Nano-nio X Loadingmentioning

confidence: 94%

“…This observation suggested that we should estimate what is called the activity index (ε0Q pass /Q dep ), Q pass is the charge consumed during the passivation step of the electrodeposited metallic Ni to oxide [25]. The values of ε are 6.3× 10 −3 and 3.4×10 −3 for Ni electrodeposited for 4 and 8 min, respectively [25].…”

Section: Effect Of Nano-nio X Loadingmentioning

confidence: 99%

“…In this regard, tailoring the electrode surface with nanostructures of transition metal oxides resulted in interesting electrocatalytic enhancement towards the OER by orders of magnitude compared to that obtained at unmodified (i.e., bare) electrodes [24][25][26][27][28]. Recently, we have reported on the significantly enhanced electrocatalytic activity of nickel oxide nanoparticle-modified electrodes towards the OER in alkaline medium [25]. However, the proposed nano-NiO x , albeit with excellent catalytic activity, lacks long-term stability.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced electrolytic generation of oxygen gas at binary nickel oxide–cobalt oxide nanoparticle-modified electrodes

Sadiek

Mohammad

Elshakre

et al. 2012

J Solid State Electrochem

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This study addresses the enhancement of the oxygen evolution reaction (OER) on glassy carbon, Au, and Pt electrodes modified with binary catalysts composed of nickel oxide nanoparticles (nano-NiO x ) and cobalt oxide nanoparticles (nano-CoO x ). Binary NiO x /CoO x -modified electrodes (with NiO x initially deposited) show a high catalytic activity and a marked stability which far exceeds that obtained at the individual oxide-modified electrodes. This enhancement is demonstrated by a marked negative shift (more than ca. 600 mV) in the onset potential of the OER compared to that obtained at the unmodified electrodes. The modified electrodes show a significantly higher long-term stability, over a period of 5 h of continuous electrolysis, without any significant loss of activity towards the OER in alkaline medium. The influence of the solution pH, the loading level, and sequence of deposition of each oxide on the electrocatalytic activity of the modified electrodes is addressed with an aim to maximize the catalytic activity of the modified electrodes towards the OER. SEM imaging is used to disclose the size and morphology of the fabricated nano-NiO x and nano-CoO x binary catalysts at the electrode surface.

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Section: Effect Of Nano-nio X Loadingmentioning

confidence: 94%

Section: Effect Of Nano-nio X Loadingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced electrolytic generation of oxygen gas at binary nickel oxide–cobalt oxide nanoparticle-modified electrodes

Sadiek

Mohammad

Elshakre

et al. 2012

J Solid State Electrochem

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“…The observed power savings of oxygen gas of our designed sensor was compared with those already reported in papers. 31,[34][35][36][37] As can be seen, the power savings of oxygen gas is comparable. Also, the trapping effect of the profusely generated O 2 gas bubbles at the modified electrode with Co-TiO 2 is very low and the values of P (a) increase with the increase in current density.…”

Section: Energy Savingsmentioning

confidence: 85%

Cobalt Doped Titanium Dioxide Nanoparticles: Synthesis, Characterization and Electrocatalytic Study

Hamid

2014

J Chinese Chemical Soc

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In this work, green synthesis of cobalt doped titanium dioxide (Co-TiO 2 ) has been carried out in aqueous medium using gelatin. The Co-TiO 2 particles have been characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray (EDAX), FT-IR spectroscopy and voltammetry techniques. XRD results show pure Co-TiO 2 and TiO 2 powders with average crystallite size about 12 nm and 15 nm, respectively. Co loaded in TiO 2 hasn't influence crystalline structure. Moreover, efficient Co-TiO 2 -based anode was fabricated by casting of the Co-TiO 2 solution on glassy carbon electrode (Co-TiO 2 /GCE). The electrocatalysis of oxygen evolution reaction (OER) at Co-TiO 2 /GCE has been examined using linear scanning voltammetry (LSV) in alkaline media. The OER is significantly enhanced at Co-TiO 2 /GCE, as demonstrated by a negative shift in the LSV curve at the Co-TiO 2 /GCE compared to that obtained at the unmodified one. The value of energy saving of oxygen gas at a current density of 5 mA cm -2 is 12.6 kW h kg -1 . The low cost as well as the marked stability of the modified electrode make it promising candidate in industrial water electrolysis process.

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“…Nickel nanoparticles (NiNPs), in the form of hydroxide or oxide, have been utilized in the study of oxygen-evolution reactions, 19,20 oxygen reduction reactions 21 and the oxidation of organic compounds, such as glucose, alcohol, amino acids, ascorbic acid, neurotransmitters and drugs, 14,[22][23][24][25][26][27][28][29][30] and inorganic compounds. 12,31 Especially in the determination of glucose, nickel modified electrodes have been extensively studied mainly in biological samples and have shown to be a good alternative to enzymic sensors, which in spite of showing great selectivity and high sensitivity, are thermally and chemically unstable.…”

Section: Introductionmentioning

confidence: 99%

Detection of Several Carbohydrates Using Boron-doped Diamond Electrodes Modified with Nickel Hydroxide Nanoparticles

Teixeira¹,

Sedenho

Stradiotto

2015

ANAL. SCI.

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In this work the electrooxidations of glucose, galactose, mannose, rhamnose, xylose and arabinose are studied at a nickel hydroxide nanoparticle modified boron-doped diamond electrode and compared to an unmodified electrode. These carbohydrates are very important in the second-generation ethanol production process. Nickel hydroxide modified borondoped diamond was characterized by scanning electron microscopy and energy dispersive X-ray. Electrochemical impedance spectroscopy was employed to study the interface properties of surface-modified electrodes in the absence and presence of the carbohydrates. Limits of detection were 5.3 × 10 -5 , 6.8 × 10 -5 , 2.7 × 10 -4 , 6.9 × 10 -5 , 8.8 × 10 -5 and 2.6 × 10 -5 mol L -1 for glucose, galactose, mannose, rhamnose, arabinose, xylose, respectively.

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Electrocatalytic activity of nickel oxide nanoparticles-modified electrodes: Optimization of the loading level and operating pH towards the oxygen evolution reaction

Cited by 93 publications

References 34 publications

Enhanced electrolytic generation of oxygen gas at binary nickel oxide–cobalt oxide nanoparticle-modified electrodes

Enhanced electrolytic generation of oxygen gas at binary nickel oxide–cobalt oxide nanoparticle-modified electrodes

Cobalt Doped Titanium Dioxide Nanoparticles: Synthesis, Characterization and Electrocatalytic Study

Detection of Several Carbohydrates Using Boron-doped Diamond Electrodes Modified with Nickel Hydroxide Nanoparticles

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