Synthesis of Co3O4/Ag/TiO2 nanotubes arrays via photo-deposition of Ag and modification of Co3O4 (311) for enhancement of visible-light photoelectrochemical performance

Zhang, Yi; Nie, Jutao; Wang, Qiang; Zhang, Xingwang; Wang, Qi; Cong, Yanqing

doi:10.1016/j.apsusc.2017.09.008

Cited by 35 publications

(4 citation statements)

References 38 publications

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“…Figure 1c shows that most of the CoVÀ Pi nanosheets are amorphous and some indistinct lattice fringes are observed. The adjacent interlayer distance 0.244 nm is assigned to the (311) plane of Co 3 O 4 , [23] and the distance of 0.246 nm corresponds to the (111) plane of CoO, [24] which are consistent with the previous literature reports. [25] Element mapping further demonstrates a uniform distribution of cobalt, oxygen, vanadium and phosphorus throughout the nanosheets structure (Figure 1d).…”

Section: Structural Characterizationsupporting

confidence: 90%

Amorphous CoV Phosphate Nanosheets as Efficient Oxygen Evolution Electrocatalyst

Dong

Zhao

Zhong

et al. 2022

Chemistry An Asian Journal

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The oxygen evolution reaction (OER) is crucial for hydrogen production. However, OER with four-electron transfer requires electrocatalysts to speed up its sluggish kinetics in alkaline solutions. Herein, amorphous CoV phosphate (denoted as CoVÀ Pi) nanosheets synthesized by a straightforward one-step hydrothermal approach is reported, which provide a low overpotential of 320 mV at 10 mA cm À 2 , a small Tafel slope down to 48.8 mV dec À 1 and long-term durability over 80 h. The efficient activity is ascribed to the amorphous nanosheets structure, high electrochemically active surface area, enhanced surface wettability and the synergistic effect of the active metal atoms. This study significantly indicates that CoVÀ Pi is a promising alternative to replace expensive noble metal-based catalysts for electrochemical water splitting.

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Section: Structural Characterizationsupporting

confidence: 90%

Amorphous CoV Phosphate Nanosheets as Efficient Oxygen Evolution Electrocatalyst

Dong

Zhao

Zhong

et al. 2022

Chemistry An Asian Journal

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“…As a result, Ag–TiO 2 exhibited enhanced visible light induced photoactivity towards reduction of Cr(VI) [217]. Co 3 O 4 /Ag/TiO 2 nanotubes arrays synthesized via photodeposition of Ag and modification of Co 3 O 4 for enhancement in visible-light photoelectrochemical performance have been studied by Zhang et al [218]. Photoreduced Ag acted as a bridge that transferred the electrons from Co 3 O 4 to TiO 2 for simultaneous Cr(VI) reduction and pollutant oxidation.…”

Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

112

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Cr(VI) exhibits cytotoxic, mutagenic and carcinogenic properties; hence, effluents containing Cr(VI) from various industrial processes pose threat to aquatic life and downstream users. Various treatment techniques, such as chemical reduction, ion exchange, bacterial degradation, adsorption and photocatalysis, have been exploited for remediation of Cr(VI) from wastewater. Among these, photocatalysis has recently gained considerable attention. The applications of photocatalysis, such as water splitting, CO2 reduction, pollutant degradation, organic transformation reactions, N2 fixation, etc., towards solving the energy crisis and environmental issues are briefly discussed in the Introduction of this review. The advantages of TiO2 as a photocatalyst and the importance of its modification for photocatalytic reduction of Cr(VI) has also been addressed. In this review, the photocatalytic activity of TiO2 after modification with carbon-based advanced materials, metal oxides, metal sulfides and noble metals towards reduction of Cr(VI) was evaluated and compared with that of bare TiO2. The photoactivity of dye-sensitized TiO2 for reduction of Cr(VI) was also discussed. The mechanism for enhanced photocatalytic activity was highlighted and attributed to the resultant properties, namely, effective separation of photoinduced charge carriers, extension of the light absorption range and intensity, increase of the surface active sites, and higher photostability. Advantages and limitations for photoreduction of Cr(VI) over modified TiO2 are depicted in the Conclusion. The various challenges that restrict the technology from practical applications in remediation of Cr(VI) from wastewater were addressed in the Conclusion section as well. The future perspectives of the field presented in this review are focused on the development of whole-solar-spectrum responsive, TiO2-coupled photocatalysts which provide efficient photocatalytic reduction of Cr(VI) along with their good recoverability and recyclability.

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“…Figure 10 shows the % photoconversion efficiency, PCE, for modified and unmodified TNTAs as a function of applied potential. The percent PCE was calculated using the following equation [ 18 , 63 ]: PCE (%) = [I ph × (1.23 − E app ) × 100]/I 0 E app = E meas − E oc where I ph is the photocurrent density in mA/cm 2 , E app is the external applied potential in V given in Equation (2), E meas is the measured bias potential in V (vs. Ag/AgCl reference electrode), and E oc is the electrode potential (vs. Ag/AgCl) of the same working electrode at open circuit conditions under the same illumination and in the same electrolyte. As we can see from Figure 9 , the photoconversion efficiency, was increased from 4.35% for pristine (pure) TNTAs to 5.18% for modified TNTAs with an increase of 19%.…”

Section: Resultsmentioning

confidence: 99%

N- and C-Modified TiO2 Nanotube Arrays: Enhanced Photoelectrochemical Properties and Effect of Nanotubes Length on Photoconversion Efficiency

2018

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In this investigation, a new, facile, low cost and environmental-friendly method was introduced to fabricate N- and C-modified TiO2 nanotube arrays by immersing the as-anodized TiO2 nanotube arrays (TNTAs) in a urea aqueous solution with mechanical agitation for a short time and keeping the TNTAs immersed in the solution for 6 h at room temperature. Then, the TNTAs were annealed at different temperatures. The produced N-, C-modified TNTAs were characterized using FESEM, EDX, XRD, XPS, UV-Vis diffuse reflectance spectra. Modified optical properties with narrow band gap energy, Eg, of 2.65 eV was obtained after annealing the modified TNTAs at 550 °C. Modified TNTAs showed enhanced photoelectochemical performance. Photoconversion efficiency (PCE) was increased from 4.35% for pristine (unmodified) TNTAs to 5.18% for modified TNTAs, an increase of 19%. Effect of nanotubes length of modified TNTAs on photoelectrochemical performance was also studied. Photocurrent density and PCE were increased by increasing nanotube length with a maximum PCE of 6.38% for nanotube length of 55 µm. This high PCE value was attributed to: band gap reduction due to C- and N-modification of TNTAs surface, increased surface area of long TNTAs compared with short TNTAs, investigated in previous studies.

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Synthesis of Co3O4/Ag/TiO2 nanotubes arrays via photo-deposition of Ag and modification of Co3O4 (311) for enhancement of visible-light photoelectrochemical performance

Cited by 35 publications

References 38 publications

Amorphous CoV Phosphate Nanosheets as Efficient Oxygen Evolution Electrocatalyst

Amorphous CoV Phosphate Nanosheets as Efficient Oxygen Evolution Electrocatalyst

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

N- and C-Modified TiO2 Nanotube Arrays: Enhanced Photoelectrochemical Properties and Effect of Nanotubes Length on Photoconversion Efficiency

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Synthesis of Co3O4/Ag/TiO2 nanotubes arrays via photo-deposition of Ag and modification of Co3O4 (311) for enhancement of visible-light photoelectrochemical performance

Cited by 35 publications

References 38 publications

Amorphous CoV Phosphate Nanosheets as Efficient Oxygen Evolution Electrocatalyst

Amorphous CoV Phosphate Nanosheets as Efficient Oxygen Evolution Electrocatalyst

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

N- and C-Modified TiO2 Nanotube Arrays: Enhanced Photoelectrochemical Properties and Effect of Nanotubes Length on Photoconversion Efficiency

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Product

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Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction