Multiple roles for LaFeO3 in enhancing the Photoelectrochemical performance of WO3

Li, Yanxin; Tang, Shimiao; Sheng, Hongbin; Li, Can; Li, Haiyan; Dong, Bo; Cao, Lei

doi:10.1016/j.jcis.2022.09.090

Cited by 7 publications

(3 citation statements)

References 44 publications

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“…However, from Figure b, it can be found that the peak and positions of the composites at the (121) and (202) crystal planes were shifted after organic doping, which may be related to the change in the dopant size. , Moreover, the higher the amount of N doping, the more obvious the shift is, which may be due to the distortion of the crystal planes caused by N doping. This shift in the peak position may lead to a certain degree of lattice defects, which in turn expose more active interfaces at the oxygen vacancy sites in the chalcogenides, , which is intrinsically conducive to the enhancement of the catalyst activity, which is consistent with the difference in catalytic activity of the catalysts in the catalytic activity test, − i.e., the higher the amount of N doping the more pronounced rightward shift of the peak positions of the major crystal planes is positively correlated with their catalytic degradation effects . This is a very interesting phenomenon, the different preparation methods and organic elements doping amount, although did not directly change the intrinsic structure of the chalcogenide materials but can be adjusted to some extent the crystalline state of the composites and photoelectronic effect.…”

Section: Resultsmentioning

confidence: 70%

Preparation of Novel C/N-Doped LaFeO₃ Type Perovskite for Efficient Photocatalytic Degradation of Sodium Humate

Hao,

Suo,

Shi

et al. 2023

ACS Omega

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LaFeO 3 chalcocite precursor was prepared by solid-phase milling method, and LaFeO 3 -type chalcocite composite catalyst, referred to as LFCN catalyst, was synthesized by in situ doping of carbon and nitrogen (urea, melamine, dicyandiamide, and carbon powder), The catalytic performance of the catalysts was investigated by the different mass ratios of LaFeO 3 chalcocite precursor and carbon and nitrogen (1:1, 1:2, and 2:1) and the degradation mechanism. Various characterization analyses, such as Xray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Brunauer−Emmett− Teller (BET), showed that the doped composite LFCN catalysts exhibited a hemispherical network structure with a larger specific surface area than that of the pure phase LaFeO 3 material. In addition, the LaFeO 3 material adjusted the electronic structure of the original LaFeO 3 chalcogenide material to a certain extent after in situ doping with organic C and N elements, which enhanced its lattice oxygen oxidation ability. In the study of the catalytic degradation of sodium humate solution under natural light conditions, the catalytic performance was significantly improved compared to that of the pure phase LaFeO 3 , and 10 mg of the catalyst degraded 30 mg/L of sodium humate solution in 50 min, with a degradation rate increasing from 40 to 98%. The degradation rate increased from 40 to 98% after 4 applications, indicating that the LFCN catalyst has good stability and significant catalytic degradation performance.

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Section: Resultsmentioning

confidence: 70%

Preparation of Novel C/N-Doped LaFeO₃ Type Perovskite for Efficient Photocatalytic Degradation of Sodium Humate

Hao,

Suo,

Shi

et al. 2023

ACS Omega

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“…To elucidate the underlying physical–chemical processes leading to PEC-activity variation in Figure , α-Fe 2 O 3 during water oxidation and sulfite oxidation, and CoPi/α-Fe 2 O 3 during water oxidation were investigated by PEIS at the potentials covering the surface states. Such a method has been well established for investigating the charge dynamics in the photoelectrode. ,, Figures S3–S5 display the resulting Nyquist plots that contain two semicircles. These Nyquist plots were fit with a full equivalent circuit as illustrated in Figure S6, representing the hole migration from the bulk to the surface states and then for surface reactions .…”

Section: Resultsmentioning

confidence: 99%

“…Such a method has been well established for investigating the charge dynamics in the photoelectrode. 12,26,27 Figures S3−S5 display the resulting Nyquist plots that contain two semicircles. These Nyquist plots were fit with a full equivalent circuit as illustrated in Figure S6, representing the hole migration from the bulk to the surface states and then for surface reactions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Roles of Surface States in Cocatalyst-Loaded Hematite Photoanodes for Water Oxidation

Pan

Katayama

2023

J. Phys. Chem. C

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Photoelectrochemical water oxidation over bare hematite (α-Fe 2 O 3 ) involved physical−chemical processes through surface states. It is found that the surface state with a higher oxidative energy (S1) served as a reaction intermediate for water oxidation, while the other surface state with a lower oxidative energy (S2) was basically catalytically inactive and induced charge recombination. Since a cocatalyst is commonly loaded on α-Fe 2 O 3 to enhance water oxidation, the physical−chemical processes between the surface states and the cocatalyst are supposedly important but remain unclear. In the present study, we elucidated such processes by employing photoelectrochemical impedance spectroscopy. We found that, in a CoPi-loaded α-Fe 2 O 3 , S1 no longer served as an intermediate for water oxidation and was mostly passivated. At the same time, S2 became the key intermediate for water oxidation by serving as a hole reservoir, prolonging the hole lifetime, and finally transferring holes to CoPi. This study reveals the surface chemistry for optimizing cocatalyst-loaded α-Fe 2 O 3 , which is different from that for bare α-Fe 2 O 3 .

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Photocatalytic activity of graphene-loaded LaFe1-xCuxO3 for organic pollutants removal

Zhang,

Dong,

et al. 2023

Res Chem Intermed

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Multiple roles for LaFeO3 in enhancing the Photoelectrochemical performance of WO3

Cited by 7 publications

References 44 publications

Preparation of Novel C/N-Doped LaFeO₃ Type Perovskite for Efficient Photocatalytic Degradation of Sodium Humate

Preparation of Novel C/N-Doped LaFeO₃ Type Perovskite for Efficient Photocatalytic Degradation of Sodium Humate

Roles of Surface States in Cocatalyst-Loaded Hematite Photoanodes for Water Oxidation

Photocatalytic activity of graphene-loaded LaFe1-xCuxO3 for organic pollutants removal

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Multiple roles for LaFeO3 in enhancing the Photoelectrochemical performance of WO3

Cited by 7 publications

References 44 publications

Preparation of Novel C/N-Doped LaFeO3 Type Perovskite for Efficient Photocatalytic Degradation of Sodium Humate

Preparation of Novel C/N-Doped LaFeO3 Type Perovskite for Efficient Photocatalytic Degradation of Sodium Humate

Roles of Surface States in Cocatalyst-Loaded Hematite Photoanodes for Water Oxidation

Photocatalytic activity of graphene-loaded LaFe1-xCuxO3 for organic pollutants removal

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Preparation of Novel C/N-Doped LaFeO₃ Type Perovskite for Efficient Photocatalytic Degradation of Sodium Humate

Preparation of Novel C/N-Doped LaFeO₃ Type Perovskite for Efficient Photocatalytic Degradation of Sodium Humate