Electrocatalysis by nanoparticles: Optimization of the loading level and operating pH for the oxygen evolution at crystallographically oriented manganese oxide nanorods modified electrodes

Mohammad, Ahmad M.; Awad, Mohamed I.; El‐Deab, Mohamed S.; Okajima, Takaharu; Ohsaka, Takeo

doi:10.1016/j.electacta.2008.01.081

Cited by 75 publications

(90 citation statements)

References 36 publications

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“…Metal oxide-based anodes, particularly those of nickel and cobalt, have long been used to catalyze the OER in alkaline electrolyzers due to their remarkable stability and activity [1][2][3][4][5][6][7][8][9][10][11]. However, metal oxides in high oxidation states (e.g., NiO 2 and CoO 2 ) show poor catalytic activity towards the OER.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Gold nanoparticles are more active toward KMnO 4 reduction than the bulk substance: Subbaraman et al reported that water oxidation of four first-row transition metal oxides did not vary with the nature of the metal support (Subbaraman et al 2012), other groups reported the importance of supports for the first-row transition metal oxides in water oxidation (El-Deab et al 2007;Mohammad et al 2008;Najafpour et al 2013e;Gorlin et al 2014;Kuo et al 2014;Bell 2011, 2012). In the Photosynth Res previous study (Najafpour et al 2013e), the gold nanoparticles deposited on layered Mn oxide were reported.…”

Section: Resultsmentioning

confidence: 95%

“…The highest shift in the onset potential of the water oxidation was observed in 0.5 M KOH, whereas the optimum loading (surface coverage) was about ca. 52 % (Mohammad et al 2008). Interestingly, a negative shift was obtained at the nano-MnO x modified with Pt electrode in comparison to the bare electrode.…”

Section: Introductionmentioning

confidence: 94%

“…Thus, a scalable catalyst production would be possible under these conditions (El-Deab et al 2007;Mohammad et al 2008;Najafpour et al 2013e;Gorlin et al 2014;Kuo et al 2014). …”

Section: Introductionmentioning

confidence: 97%

“…Interestingly, a negative shift was obtained at the nano-MnO x modified with Pt electrode in comparison to the bare electrode. Using X-ray photoelectron spectroscopy measurements, the group concluded that the nano-MnO x modification has no influence on the surface electronic structures of the bare Au, Pt, and GC electrodes (Mohammad et al 2008). The group proposed that the catalytic enhancement may be caused via redox mediation by Mn oxide (Mohammad et al 2008).…”

Section: Introductionmentioning

confidence: 98%

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Manganese oxides supported on gold nanoparticles: new findings and current controversies for the role of gold

et al. 2015

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We synthesized manganese oxides supported on gold nanoparticles (diameter <100 nm) by the reaction of KMnO4 with gold nanoparticles under hydrothermal conditions. In this green method Mn oxide is deposited on the gold nanoparticles. The compounds were characterized by scanning electron microscopy, energy-dispersive spectrometry, high-resolution transmission electron microscopy, X-ray diffraction, UV-Vis spectroscopy, Fourier transform infrared spectroscopy, and atomic absorption spectroscopy. In the next step, the water-oxidizing activities of these compounds in the presence of cerium(IV) ammonium nitrate as a non-oxo transfer oxidant were studied. The results show that these compounds are good catalysts toward water oxidation with a turnover frequency of 1.0 ± 0.1 (mmol O2/(mol Mn·s)). A comparison with other previously reported Mn oxides and important factors influencing the water-oxidizing activities of Mn oxides is also discussed.

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Activation Energies in Computational Chemistry—A Case Study

Busch

Ahlberg

Panas

2011

Rate Constant Calculation for Thermal Reactions

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Electrocatalysis by nanoparticles: Optimization of the loading level and operating pH for the oxygen evolution at crystallographically oriented manganese oxide nanorods modified electrodes

Cited by 75 publications

References 36 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

Manganese oxides supported on gold nanoparticles: new findings and current controversies for the role of gold

Activation Energies in Computational Chemistry—A Case Study

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