Enhanced photoelectrochemical efficiency and stability using nitrogen-doped TiO2 on a GaAs photoanode

Choi, Kee-Bong; Bang, Jangwon; Moon, In Kyu; Kim, Kyung-Hwan; Oh, Jungwoo

doi:10.1016/j.jallcom.2020.155973

Cited by 16 publications

(4 citation statements)

References 53 publications

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“…The greater the photoelectrodes’ stability, the higher the efficiency achieved. − To test the photoactivity of the fabricated photoanodes, the transient photocurrent ( J – t ) tests of all synthesized photoelectrodes were performed under intermittent and continuous conditions at a constant external bias of −0.101 V SCE in 1 M KOH. As depicted in Figure S1c,d, a significant photocurrent response of the as-synthesized nanotube array films was observed with the “light on” state, accompanied by a sharp decay with the “light off”.…”

Section: Resultsmentioning

confidence: 99%

Ternary Ti–Mo–Fe Nanotubes as Efficient Photoanodes for Solar-Assisted Water Splitting

et al. 2021

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Designing efficient and stable water splitting photocatalysts is an intriguing challenge for energy conversion systems. We report on the optimal fabrication of perfectly aligned nanotubes on trimetallic Ti–Mo–Fe alloy with different compositions prepared via the combination of metallurgical control and facile electrochemical anodization in organic media. The X-ray diffraction (XRD) patterns revealed the presence of composite oxides of anatase TiO2 and magnetite Fe3O4 with better stability and crystallinity. With the optimal alloy composition Ti–(5.0 atom %) Mo–(5.0 atom %) Fe anodized for 16 h, enhanced conductivity, improved photocatalytic performance, and remarkable stability were achieved in comparison with Ti–(3.0 atom %) Mo–(1.0 atom %) Fe samples. Such optimized nanotube films attained an enhanced photocatalytic activity of ∼0.272 mA/cm2 at 0.9 VSCE, which is approximately 4 times compared to the bare TiO2 nanotubes fabricated under the same conditions (∼0.041 mA/cm2 at 0.9 VSCE). That was mainly correlated with the emergence of Mo and Fe impurities within the lattice, providing excess charge carriers. Meanwhile, the nanotubes showed outstanding stability with a longer electron lifetime. Moreover, carrier density variations, lower charge transfer resistance, and charge carriers dynamics features were demonstrated via the Mott–Schottky and electrochemical impedance analyses.

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Section: Resultsmentioning

confidence: 99%

Ternary Ti–Mo–Fe Nanotubes as Efficient Photoanodes for Solar-Assisted Water Splitting

et al. 2021

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“…Nevertheless, the growth of the oxidation layer with time still leads to a steady shift of the Ti-2p 3/2 peaks to high binding energies. From a qualitative comparison, the positions of the Ti-2p 3/2 and Ti-2p 1/2 peaks for the oxidized samples are located in between the values of TiO 2 and TiN . For the XPS results, the possibility for the presence of Ti 3+ (in the form of Ti 2 O 3 ) cannot be excluded considering the multivalent nature of Ti, although it is not observable (i.e., in the form of Ti 2 O 3 ) by XRD probably due to poor crystallinity.…”

Section: Resultsmentioning

confidence: 93%

Nanoscale Engineering of Optical nonlinearity Based on a Metal Nitride/Oxide Heterostructure

Zhang

Cui

Zhu

et al. 2020

ACS Appl. Mater. Interfaces

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The abilities to modulate linear and nonlinear optical response of materials in the nanoscale are of central importance in the design and fabrication of photonic devices for applications like optical modulators. Here, based on a simple transition metal oxide/nitride (TiO2/TiN) system, we show that it is possible to tune the optical properties by controlling the nanoscale architecture. Through controlled oxidation of the plasmonic TiN nanoparticle surfaces, we observe a continuous change of linear and nonlinear optical (NLO) properties with the increase of the thickness of the oxide layer in the TiN/TiO2 heterogeneous architecture. The NLO response is manifested by the strong saturable absorption with a structurally tunable negative NLO absorption coefficient. The variation in the NLO absorption coefficient by up to 7-fold can be connected to the relative change in the volume fraction of the metallic core and the dielectric shell. We demonstrate further that the optimized TiN–TiO2 heterostructures can be used to drive an optical switch for pulse laser generation in the 1.5 μm wavelength region. Our results delineate a topochemical process for optimization of the NLO properties of common plasmonic materials for photonic applications based on simple materials chemistry.

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“…It was reported that the nitrogen atoms replaced the oxygen atoms in the lattice of TiO 2 ; which led to the production of a large number of oxygen vacancies. 40 And the substitution of nitrogen alters the electronic properties of TiO 2 , which can improve the redox power of carriers. 34 This is in agreement with CeCrLa/TiO 2 –N exhibiting the best NH 3 -SCR performance among the CeCrLa/Ti catalysts.…”

Section: Resultsmentioning

confidence: 99%

Improvement of low-temperature NH₃-SCR catalytic performance over nitrogen-doped MO_x–Cr₂O₃–La₂O₃/TiO₂–N (M = Cu, Fe, Ce) catalysts

Sun

Liu

et al. 2021

RSC Adv.

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Enhanced photoelectrochemical efficiency and stability using nitrogen-doped TiO2 on a GaAs photoanode

Cited by 16 publications

References 53 publications

Ternary Ti–Mo–Fe Nanotubes as Efficient Photoanodes for Solar-Assisted Water Splitting

Ternary Ti–Mo–Fe Nanotubes as Efficient Photoanodes for Solar-Assisted Water Splitting

Nanoscale Engineering of Optical nonlinearity Based on a Metal Nitride/Oxide Heterostructure

Improvement of low-temperature NH₃-SCR catalytic performance over nitrogen-doped MO_x–Cr₂O₃–La₂O₃/TiO₂–N (M = Cu, Fe, Ce) catalysts

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Enhanced photoelectrochemical efficiency and stability using nitrogen-doped TiO2 on a GaAs photoanode

Cited by 16 publications

References 53 publications

Ternary Ti–Mo–Fe Nanotubes as Efficient Photoanodes for Solar-Assisted Water Splitting

Ternary Ti–Mo–Fe Nanotubes as Efficient Photoanodes for Solar-Assisted Water Splitting

Nanoscale Engineering of Optical nonlinearity Based on a Metal Nitride/Oxide Heterostructure

Improvement of low-temperature NH3-SCR catalytic performance over nitrogen-doped MOx–Cr2O3–La2O3/TiO2–N (M = Cu, Fe, Ce) catalysts

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Improvement of low-temperature NH₃-SCR catalytic performance over nitrogen-doped MO_x–Cr₂O₃–La₂O₃/TiO₂–N (M = Cu, Fe, Ce) catalysts