Alkaline-stable nickel manganese oxides with ideal band gap for solar fuel photoanodes

Suram, Santosh K.; Zhou, Lan; Shinde, Aniketa; Yan, Qimin; Yu, Jie; Umehara, Mitsutaro; Stein, Helge S.; Neaton, Jeffrey B.; Gregoire, John M.

doi:10.1039/c7cc08002f

Cited by 3 publications

(1 citation statement)

References 34 publications

(3 reference statements)

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“…Optimizing the performance of heterojunctions is less trivial than for a single layer. Consequently, there have been far more studies on optimizing the PEC activity of single-layer materials − than heterojunction systems …”

Section: Introductionmentioning

confidence: 99%

Systematic Exploration of WO₃/TiO₂ Heterojunction Phase Space for Applications in Photoelectrochemical Water Splitting

et al. 2022

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Recent work has shown that heterojunction photoelectrodes can achieve synergistically higher water splitting activity than their parent materials. To optimize the performance in such layered systems, it is necessary to develop new methods capable of assessing heterojunction phase space. Herein, we explore WO3/TiO2 heterojunction phase space as a model system. Using chemical vapor deposition, 71 unique photoanodes were grown (15 single-layer; 56 heterojunctions). The materials were physically characterized using X-ray diffraction, Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy analysis, and ultraviolet–visible transmission spectroscopy. Various key performance indicators were measured. Within this WO3/TiO2 heterojunction phase space, the onset potentials ranged from ∼0.45 to ∼0.81 V RHE; the incident-photon-to-current efficiencies at 350, 375, and 400 nm ranged from ∼0.6 to ∼50.9, ∼0.1 to ∼30.0, and ∼0 to ∼15.6%, respectively; and the theoretical solar photocurrents ranged from ∼0.01 to ∼0.94 mA cm–2. Contour plots allowed us to identify regions of heterojunction phase space with high activity and establish trends. We identified an electronic barrier to charge transfer between the heterojunction layers that required a sufficiently high applied potential (≥1.0 V RHE) to be surpassed for synergetic improvements in activity to be observed. We recommend that the methods developed herein, for assessing the performance of sample libraries of heterojunction photoelectrodes, be used alongside combinatorial synthesis methods and high-throughput photoelectrochemical measurements to optimize promising heterojunction systems more rigorously and rapidly.

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Section: Introductionmentioning

confidence: 99%

Systematic Exploration of WO₃/TiO₂ Heterojunction Phase Space for Applications in Photoelectrochemical Water Splitting

et al. 2022

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An insight of photoelectrochemical driven urea oxidation from nickel manganese oxide nanostructures

Devi,

Kumari,

Jha

2024

Materials Chemistry and Physics

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Hydrothermally grown Cu doped NiMnO3 perovskite nanostructures suitable for optoelectronic, photoluminescent and electrochemical properties

Upadhyay,

Assadullah,

Tomar

2024

Sci Rep

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Transition metal-based perovskites have emerged as highly promising and economically advantageous semiconductor materials due to their exceptional performance in optoelectronics, photovoltaic, photocatalysis, and photoluminescence. In this study, we employed a microwave-assisted hydrothermal process to produce a Cu-doped NiMnO3 nanocomposite electrode material. The appearance of a peak corresponding to the (110) plane with a 2θ value of 36.6° confirmed the growth of the rhombohedral NiMnO3 crystal structure. The presence of metal–oxygen bonds in NiMnO3 was confirmed through FTIR spectra. XPS validates the chemical composition, providing additional support for the results obtained from XRD and FT-IR analyses. FE-SEM affirmed the anisotropic growth of small sphere-like structures that agglomerated to form broccoli-like shapes. Cu doping modified the band gap, reducing it from 2.2 to 1.7 eV and enhancing its photoluminescent (PL) activity by introducing defects. The increase in PL intensity (visible light luminescent intensity) can be attributed to a concurrent rise in complex defects and the rate of recombination of electron–hole pairs. Finally, the electrochemical activity demonstrated the pseudo-capacitor behavior of the synthesized material, with capacitance values increasing as the copper (Cu) content in the parent lattice increased.

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Alkaline-stable nickel manganese oxides with ideal band gap for solar fuel photoanodes

Cited by 3 publications

References 34 publications

Systematic Exploration of WO₃/TiO₂ Heterojunction Phase Space for Applications in Photoelectrochemical Water Splitting

Systematic Exploration of WO₃/TiO₂ Heterojunction Phase Space for Applications in Photoelectrochemical Water Splitting

An insight of photoelectrochemical driven urea oxidation from nickel manganese oxide nanostructures

Hydrothermally grown Cu doped NiMnO3 perovskite nanostructures suitable for optoelectronic, photoluminescent and electrochemical properties

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Alkaline-stable nickel manganese oxides with ideal band gap for solar fuel photoanodes

Cited by 3 publications

References 34 publications

Systematic Exploration of WO3/TiO2 Heterojunction Phase Space for Applications in Photoelectrochemical Water Splitting

Systematic Exploration of WO3/TiO2 Heterojunction Phase Space for Applications in Photoelectrochemical Water Splitting

An insight of photoelectrochemical driven urea oxidation from nickel manganese oxide nanostructures

Hydrothermally grown Cu doped NiMnO3 perovskite nanostructures suitable for optoelectronic, photoluminescent and electrochemical properties

Contact Info

Product

Resources

About

Systematic Exploration of WO₃/TiO₂ Heterojunction Phase Space for Applications in Photoelectrochemical Water Splitting

Systematic Exploration of WO₃/TiO₂ Heterojunction Phase Space for Applications in Photoelectrochemical Water Splitting