Study on electrocatalytic property of ZnO and Ag/ZnO

Nie, Ming; Sun, Haiyi; Cai, Honglan; Xue, Zhenhong; Yang, Chi; Li, Q.; Qin, Lizhao; Wu, Mingyu

doi:10.1016/j.matlet.2020.127785

Cited by 21 publications

(13 citation statements)

References 16 publications

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“…The particle electrode had many obvious diffraction peaks, which were indicative of a good crystallinity. The crystal of ZnO with a hexagonal structure was confirmed by comparing with PDF cards (PDF#80-0075) [ 30 ], which was consistent with the XRD results of ZnO prepared by Nie et al [ 31 ]. ZnO is an eco-friendly catalyst, which has the environmental superiority of heterogeneous catalysis that can meet the need of organic pollutant degradation.…”

Section: Resultssupporting

confidence: 81%

Fluidized ZnO@BCFPs Particle Electrodes for Efficient Degradation and Detoxification of Metronidazole in 3D Electro-Peroxone Process

et al. 2022

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A novel material of self-shaped ZnO-embedded biomass carbon foam pellets (ZnO@BCFPs) was successfully synthesized and used as fluidized particle electrodes in three-dimensional (3D) electro-peroxone systems for metronidazole degradation. Compared with 3D and 2D + O3 systems, the energy consumption was greatly reduced and the removal efficiencies of metronidazole were improved in the 3D + O3 system. The degradation rate constants increased from 0.0369 min−1 and 0.0337 min−1 to 0.0553 min−1, respectively. The removal efficiencies of metronidazole and total organic carbon reached 100% and 50.5% within 60 min under optimal conditions. It indicated that adding ZnO@BCFPs particle electrodes was beneficial to simultaneous adsorption and degradation of metronidazole due to improving mass transfer of metronidazole and forming numerous tiny electrolytic cells. In addition, the process of metronidazole degradation in 3D electro-peroxone systems involved hydroxyethyl cleavage, hydroxylation, nitro-reduction, N-denitrification and ring-opening. The active species of ·OH and ·O2− played an important role. Furthermore, the acute toxicity LD50 and the bioconcentration factor of intermediate products decreased with the increasing reaction time.

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Section: Resultssupporting

confidence: 81%

Fluidized ZnO@BCFPs Particle Electrodes for Efficient Degradation and Detoxification of Metronidazole in 3D Electro-Peroxone Process

et al. 2022

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“…Although ZnO has been heavily studied as a promising neutral pH water splitting material for UV activation in the area of photocatalysis, − its use in the area of electrocatalysis has been clearly lacking. The limiting factor that has conventionally bound electrocatalytic water splitting to either alkaline or acidic media is simply inappropriate for ZnO utilization due to high observed overpotentials and poor stability in acidic or alkaline media. , Crystalline wurtzite ZnO tends to dissolve forming amorphous complexes in both acidic and alkaline conditions (pH < 6.4 and 8.3 < pH < 10.5). − Moreover, severe aggregation is noted between pH 6.4 and pH 9.4. , However, we postulate that introduction of surface modulations may result in enhanced performances. Accordingly, the utilization of computational methods, specifically density functional theory (DFT), for the expedited screening of surface parameters known to affect electrocatalytic performance was swiftly performed for crystalline ZnO.…”

Section: Introductionmentioning

confidence: 86%

“…The limiting factor that has conventionally bound electrocatalytic water splitting to either alkaline or acidic media is simply inappropriate for ZnO utilization due to high observed overpotentials and poor stability in acidic or alkaline media. 28,29 Crystalline wurtzite ZnO tends to dissolve forming amorphous complexes in both acidic and alkaline conditions (pH < 6.4 and 8.3 < pH < 10.5). 30−34 Moreover, severe aggregation is noted between pH 6.4 and pH 9.4.…”

Section: ■ Introductionmentioning

confidence: 99%

Local Surface Modulation Activates Metal Oxide Electrocatalyst for Hydrogen Evolution: Synthesis, Characterization, and DFT Study of Novel Black ZnO

Badreldin

Abdel‐Wahab

Balbuena

2020

ACS Appl. Energy Mater.

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Modulation of atomic surface constitution has been previously reported to effectively activate inert metal oxides for electrocatalytic hydrogen evolution reaction (HER). This work follows on this seemingly untrodden path whereby, via utilization of first-principles DFT calculations and the accepted HER activity description (|ΔG H* |), the polar (002) surface of commercially abundant ZnO shows a clear preference toward HER activity compared to other facets. Further, a robust and systematic screening of viable surface modulators was performed, through which it was determined that surface oxygen vacancies atop (002) ZnO yield a phenomenal reduction in |ΔG H* | (namely, 36 meV) toward the ideal zero value. This shows promise for industrial realization as an alternative to Pt and transition-metal chalcogenides. The viability of production was ensured through the rational faceted growth of (002) ZnO followed by a physicochemical reduction technique. This resulted in a novel "black" ZnO material with universal pH stability. Electrochemical measurements showed that to achieve a current density of 10 mA cm −2 , black ZnO requires an overpotential of 220 mV, compared to 440 mV of its pristine counterpart in acidic (0.5 M H 2 SO 4 ) electrolyte. It is this work's foresight that appropriate and facile structural modifications may be applied to the myriad of available transition-metal oxides as a way to ameliorate the pressure on environmentally poignant hydrogen generation methods for an array of industrial uses.

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“…The average crystallite size was decreased with increasing Al doping concentration and calculated using the Debye-Scherrer's formula [32]:…”

Section: Resultsmentioning

confidence: 99%

“…It has been reported that the doping of Zinc Oxide (ZnO) with various metal elements such as gallium (Ga), indium (In), Tin (Sn), Lead (Pb), Iron (Fe), Nickel (Ni) and aluminum (Al) improve some of its properties [32][33][34][35][36][37][38]. Among them, aluminum (Al) is commonly used to form Al-doped ZnO (AZO) to improve the conductivity of zinc oxide [39].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of ZnO and Al Doped ZnO Thin Films Prepared by Sol Gel Method for Solar Cell Applications

Bouacheria

Djelloul

Adnane

2022

Preprint

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Pure and Al-doped ZnO (AZO) thin films with different aluminium (Al) concentrations (Al: 0.5, 1, 2, and 3 wt.%) were prepared on p-type Si(100) substrate by a dip-coating technique using different zinc and aluminum precursors. The structural, morphological, optical and electrical properties of these films were investigated using a number of techniques, including the X-Ray Diffraction (XRD), scanning electron microscopy (SEM), Atomic force electron microscopy (AFM), ultraviolet–visible spectrophotometry, photoluminescence(PL) spectroscopy and four-point probe technique. The X-ray diffraction (XRD) results shown that the obtained (AZO) films were polycrystalline with a highly c-axis preferred (002) orientation, and the average crystallites size decrease from 28.32 to 24.61 nm with the increase in Al dopant concentration. The studies demonstrated that the ZnO film had a good transparency in the visible range with the maximum transmittance of 95% and the band gaps (Eg) varied from 3.16 to 3.26 eV by alumium doping. Scanning electron microscopy (SEM) images showed that the surface morphology of the films changed with increase of Al-doping. The photoluminescence spectra also showed changed with Al-doping.

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Study on electrocatalytic property of ZnO and Ag/ZnO

Cited by 21 publications

References 16 publications

Fluidized ZnO@BCFPs Particle Electrodes for Efficient Degradation and Detoxification of Metronidazole in 3D Electro-Peroxone Process

Fluidized ZnO@BCFPs Particle Electrodes for Efficient Degradation and Detoxification of Metronidazole in 3D Electro-Peroxone Process

Local Surface Modulation Activates Metal Oxide Electrocatalyst for Hydrogen Evolution: Synthesis, Characterization, and DFT Study of Novel Black ZnO

Characteristics of ZnO and Al Doped ZnO Thin Films Prepared by Sol Gel Method for Solar Cell Applications

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