Visible-light-induced reduction of hexavalent chromium utilizing cobalt phosphate (Co-Pi) sensitized inverse opal TiO<sub>2</sub>as a photocatalyst

Lv, Weijia; Liu, Zhihang; Lan, Jinjing; Liu, Ziyu; Mi, Wenxin; Lei, Juying; Wang, Lingzhi; Liu, Yongdi; Zhang, Jinlong

doi:10.1039/c7cy01748k

Cited by 31 publications

(10 citation statements)

References 40 publications

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“…In addition, we measured X-ray photoelectron spectroscopy (XPS) to investigate further the structure of CoPi/Fh/Ti–Fe 2 O 3 . It is obvious that the intensity of OH – is enhanced compared to O 2– due to the more Fe–OH after the deposition of Fh on Ti–Fe 2 O 3 , as illustrated in Figure a, which further indicates the existence of Fh. , After the deposition of CoPi, two main peaks at 781.1 and 796.86 eV are observed in Figure b, which are distributed to Co 2p 1/2 and Co 2p 3/2 in CoPi. , And the binding energy located at 133.0 eV confirms that P exists in the form of phosphate, as shown in Figure c. Furthermore, Figure S3 manifests the peak of Ti 2p situated at 458.1 eV is assigned to Ti 4+ in Ti–Fe 2 O 3 , while the peak of Ti 2p vanishes for Fh/Ti–Fe 2 O 3 and CoPi/Fh/Ti–Fe 2 O 3 resulting from the complete coverage of Fh and CoPi .…”

Section: Resultsmentioning

confidence: 80%

“…24,30 After the deposition of CoPi, two main peaks at 781.1 and 796.86 eV are observed in Figure 2b, which are distributed to Co 2p 1/2 and Co 2p 3/2 in CoPi. 25,36 And the binding energy located at 133.0 eV confirms that P exists in the form of phosphate, 37 Figure 3a shows CoPi/Fh/Ti−Fe 2 O 3 possesses better PEC performance than other photoanodes, which can achieve 3.0 mA/cm 2 Figure 3b demonstrates the incident photon to current conversion efficiency (IPCE) values of CoPi/Fh/Ti−Fe 2 O 3 at 1.23 V RHE in the whole wavelength region are increased in contrast with other photoanodes. Furthermore, the applied bias photon-to-current efficiency (ABPE) of all photoanodes further proves the positive role of the introduction of Fh between Ti−Fe 2 O 3 and CoPi on the PEC performance.…”

Section: Acs Sustainable Chemistry and Engineeringmentioning

confidence: 99%

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Hole Transfer Channel of Ferrihydrite Designed between Ti–Fe₂O₃ and CoPi as an Efficient and Durable Photoanode

Zhang

et al. 2019

ACS Sustainable Chem. Eng.

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A high-efficient oxygen evolution cocatalyst decorated on α-Fe2O3 has been considered as one of the most prospective approaches to accelerate the charge transport at the interface between photoanode and electrolyte. However, efficient charge transport from the semiconductor to the surface of the cocatalyst is still a challenge in fabricating semiconductor electrodes integrated with cocatalysts. Here, we elaborately introduce ferrihydrite (Fh) as a hole transfer channel between Ti doped α-Fe2O3 (Ti–Fe2O3) and cobalt phosphate (CoPi), which exhibits a superior photocurrent density of 3.0 mA/cm2 at 1.23 VRHE and 100 mV negative shift of the onset potential in contrast to CoPi/Ti–Fe2O3. The outstanding photoelectrochemistry performance is not only ascribed to the accelerated charge transfer from Ti–Fe2O3 to the surface of CoPi, but also beneficial from the fluent injection of photogenerated holes into the electrolyte, when Fh is introduced between Ti–Fe2O3 and CoPi. This work emphasizes the importance of introducing a hole transfer channel between semiconductor and cocatalyst in constructing outstanding photoanodes.

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Section: Resultsmentioning

confidence: 80%

Section: Acs Sustainable Chemistry and Engineeringmentioning

confidence: 99%

Hole Transfer Channel of Ferrihydrite Designed between Ti–Fe₂O₃ and CoPi as an Efficient and Durable Photoanode

Zhang

et al. 2019

ACS Sustainable Chem. Eng.

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“…37 Also, the binding energies of P 2p at 132.9 eV can be easily observed in Figure S4c, which correspond to cobalt and phosphorus compounds. 37 Additionally, the peaks located at binding energies of 368.2 and 374.1 eV belong to Ag 3d 5/2 and Ag 3d 3/2 , respectively, suggesting the existence of Ag 0 . 38 These results also declare that there is no effect on Pt/WO 3 /Ag during the deposition of the Co-Pi cocatalyst.…”

Section: Acs Sustainable Chemistry and Engineeringmentioning

confidence: 91%

Efficient WO₃ Photoanode Modified by Pt Layer and Plasmonic Ag for Enhanced Charge Separation and Transfer To Promote Photoelectrochemical Performances

Liu

Guo

et al. 2019

ACS Sustainable Chem. Eng.

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Effective separation and transfer of photogenerated charge as well as sufficient visible light harvesting play a crucial role on the photoelectrochemical performance of photoelectrodes. Hence, in this work, the WO 3 photoanode modified by plasmonic Ag nanoparticles (surface) and Pt nanoparticles (bottom) was designed and fabricated for the first time to realize efficient water splitting. In this Pt/WO 3 /Ag photoanode, the Ag nanoparticles as photosensitizers enlarge the absorption spectrum and facilitate charge separation due to its fascinating SPR effect; moreover, the Pt layer serves as an electron collector to trap the electrons and then transfer them to the FTO substrate, where their synergistic effect leads to efficient charge separation and transfer. As a result, the Pt/WO 3 /Ag photoanode yields an enhanced photocurrent of 1.13 mA/cm 2 at 1.23 V vs RHE under AM 1.5G illumination in a 0.2 M Na 2 SO 4 solution, which is nearly 3.32 times that of bare WO 3 . Furthermore, a hole transfer Co-Pi layer was introduced to further accelerate charge separation and transfer and improve the stability of the photoanode simultaneously, reaching a photocurrent density of 1.39 mA/cm 2 at 1.23 V vs RHE. This rational combination of noble metal nanostructures with semiconductors could provide a promising concept to design photoelectrodes efficiently in PEC water splitting.

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“…Inverse opals have been used for a variety of applications, including: electrochemical storage, photonic crystals, high relative strength materials, surface enhanced raman spectroscopy (SERS), photocatalysis, and biomimetic substrates . Most commonly for these applications, inverse opals are made with multilayer colloidal polystyrene (PS) structures where the fabrication process parameters (material, colloid diameter, degree of order, etc.)…”

Section: Inverse Opal Field Emission Device Fabricationmentioning

confidence: 99%

Field Emitters Using Inverse Opal Structures

Jones

Zhang

Murty

et al. 2019

Adv Funct Materials

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Electronics to be used in space must often perform in high temperature or radiation hard environments that render conventional solid-state technologies unable to meet mission requirements. As a result, microscale and nanoscale field emission devices are being explored as fundamental components of electronics capable of operating in these harsh environments. Wide scale implementation of these devices is hindered by the difficulty of fabricating large, mechanically stable, uniform arrays of sharp emitting tips. This work presents a scalable method to produce uniform arrays of field emitting tips. Polystyrene spheres are applied as a template for electrochemical deposition. An electrochemical etching process is developed to sharpen tips to a radius of curvature of 5-10 nm, optimizing them for field emission applications. The flexibility of the fabrication process allows for device optimization in terms of tip geometry, density, and constituent material to achieve high field enhancement factors, exceeding 100. Miniaturized field emitting diode and gated triode devices are fabricated. Finally, the electrochemically deposited material is used as a scaffold for the deposition of a refractory, low work function emitting layer, and the hybrid cathode is characterized as a field emitter at temperatures up to 300 ºC.

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Visible-light-induced reduction of hexavalent chromium utilizing cobalt phosphate (Co-Pi) sensitized inverse opal TiO₂as a photocatalyst

Abstract: Cobalt phosphate (Co-Pi) modified inverse opal TiO2was developed and applied for efficient photocatalytic reduction of Cr(vi).

Cited by 31 publications

References 40 publications

Hole Transfer Channel of Ferrihydrite Designed between Ti–Fe₂O₃ and CoPi as an Efficient and Durable Photoanode

Hole Transfer Channel of Ferrihydrite Designed between Ti–Fe₂O₃ and CoPi as an Efficient and Durable Photoanode

Efficient WO₃ Photoanode Modified by Pt Layer and Plasmonic Ag for Enhanced Charge Separation and Transfer To Promote Photoelectrochemical Performances

Field Emitters Using Inverse Opal Structures

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Visible-light-induced reduction of hexavalent chromium utilizing cobalt phosphate (Co-Pi) sensitized inverse opal TiO2as a photocatalyst

Abstract: Cobalt phosphate (Co-Pi) modified inverse opal TiO2was developed and applied for efficient photocatalytic reduction of Cr(vi).

Cited by 31 publications

References 40 publications

Hole Transfer Channel of Ferrihydrite Designed between Ti–Fe2O3 and CoPi as an Efficient and Durable Photoanode

Hole Transfer Channel of Ferrihydrite Designed between Ti–Fe2O3 and CoPi as an Efficient and Durable Photoanode

Efficient WO3 Photoanode Modified by Pt Layer and Plasmonic Ag for Enhanced Charge Separation and Transfer To Promote Photoelectrochemical Performances

Field Emitters Using Inverse Opal Structures

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Product

Resources

About

Visible-light-induced reduction of hexavalent chromium utilizing cobalt phosphate (Co-Pi) sensitized inverse opal TiO₂as a photocatalyst

Hole Transfer Channel of Ferrihydrite Designed between Ti–Fe₂O₃ and CoPi as an Efficient and Durable Photoanode

Hole Transfer Channel of Ferrihydrite Designed between Ti–Fe₂O₃ and CoPi as an Efficient and Durable Photoanode

Efficient WO₃ Photoanode Modified by Pt Layer and Plasmonic Ag for Enhanced Charge Separation and Transfer To Promote Photoelectrochemical Performances