Insight into the regulation between crystallinity and oxygen vacancies of BiVO<sub>4</sub> affecting the photocatalytic oxygen evolution activity

Zhang, Yaqian; Han, Wenyuan; Ding, Lingling; Fan, Fang; Xie, Zhengzheng; Liu, Xianglei; Chang, Kun

doi:10.1039/d2cy00574c

Cited by 9 publications

(6 citation statements)

References 57 publications

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“…This means that the reduced ECL intensity might be attributed to the decreased conductivity upon introducing CdAl-LDHs. It is reported that highly crystalline materials with long-range ordered atomic arrangements generally show better electrochemical activity . Therefore, high crystallinity increases the carrier mobility, reduces electron consumption, and improves the subsequent ECL performance .…”

Section: Resultsmentioning

confidence: 99%

“…It is reported that highly crystalline materials with long-range ordered atomic arrangements generally show better electrochemical activity. 37 Therefore, high crystallinity increases the carrier mobility, reduces electron consumption, and improves the subsequent ECL performance. 38 To verify this hypothesis, the conductivities of CN, CdAl-LDHs, and CN/CdAl-LDHs were investigated by ECSA and EIS measurements.…”

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confidence: 99%

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Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Jia,

Fan,

et al. 2024

Anal. Chem.

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The electrochemiluminescence (ECL) signal is largely determined by the electron transfer efficiency. Therefore, in the nanomaterial-involved ECL system, the structure-related electron distribution could affect the electron transfer efficiency and further alter the ECL intensity. These features make the design of versatile ECL-based analytical techniques for probing the correlated structure possible. And it is generally accepted that the increased crystallinity of nanomaterials usually leads to a uniform electron distribution, which provides higher conductivity. Therefore, the crystallinity-improved conductivity could facilitate electron transfer, promote the electrochemical activity of support materials, and boost the efficiency of the ECL reaction. In this study, we have demonstrated that the ECL signal of the graphitic carbon nitride reporter was proportional to the crystallinity of layered double hydroxides (LDHs), which meets the supposition well. On the basis of this phenomenon, an ECL-based crystallinity analysis approach has been established using CdAl-LDHs as the model materials. The universality of this proposed technique was further validated by the rapid and accurate crystallinity determination of ZnAl-LDH samples with diverse crystallinities. This work not only contributes an alternative to the X-ray diffraction technique for the rapid screening of crystallinity in layered materials but also opens a new avenue for the design of ECL-based structure analysis techniques toward nanomaterials and even organic materials by involving electron transfer regulation correlation.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Jia,

Fan,

et al. 2024

Anal. Chem.

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“…On the contrary, other C 3 N 4 nanoflower samples show relatively poor stability and weak ECL intensity. The great improvement of the ECL stability is probably due to the long-range ordered atomic arrangements in the high-crystalline C 3 N 4 structure, which makes the atoms in the CN framework more stable and inhibits the passivation caused from the overinjected electrons. , …”

Section: Resultsmentioning

confidence: 99%

“…In this work, a nanoflower structure of supramolecular aggregates was employed to reduce the structure defects and increase the crystallinity. 17 The C 3 N 4 nanoflower were successfully prepared through simple thermal polymerization of the supramolecular aggregates (MCA) formed by selfassembly of melamine and cyanuric acid. By adjusting the calcination temperature, we can achieve the purpose of controlling the crystallinity of the C 3 N 4 nanoflower.…”

Section: Introductionmentioning

confidence: 99%

“…Apparently, the weak and unstable ECL emission of C 3 N 4 was caused from the poor structural stability during the electrochemical reaction process. It is generally believed that C 3 N 4 materials prepared by thermal polymerization of nitrogen-rich precursors present an amorphous or semi-crystalline structure, and the disordered arrangement of atoms is easily destroyed during the reaction process. , Besides, there are also a lot of surface defects, residual amino groups, and hydrogen bonds in the CN framework of C 3 N 4 , which will act as charge trap sites and lead to low conductivity. , Therefore, increasing the crystallinity of C 3 N 4 may be a good proposal to solve the problem because the high crystallinity materials with long-range ordered atomic arrangements usually possess a pretty good chemical and structure stability during the electrochemical reaction system. − Furthermore, the reduction of defects in C 3 N 4 can increase the mobility of carriers and reduce the unessential consumption of electrons, which will also be beneficial to improve the ECL performance. , Inspired by these advantages, it enlightens us to proposed a convenient strategy to improve the ECL performance of C 3 N 4 by optimizing the crystallinity on the basis of reducing defects.…”

Section: Introductionmentioning

confidence: 99%

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Crystallization Regulation Engineering in the Carbon Nitride Nanoflower for Strong and Stable Electrochemiluminescence

Zhao

Liang

Zou

et al. 2023

ACS Appl. Mater. Interfaces

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Cathode electrochemiluminescence (ECL) of C 3 N 4 material has suffered from weak and unstable ECL emission for a long time, which greatly limits its practical application. Herein, a novel approach was developed to improve the ECL performance by regulating the crystallinity of the C 3 N 4 nanoflower for the first time. The high-crystalline C 3 N 4 nanoflower achieved a pretty strong ECL signal as well as excellent long-term stability compared to low-crystalline C 3 N 4 when K 2 S 2 O 8 was used as a co-reactant. Through the investigation, it is found that the enhanced ECL signal is attributed to the simultaneous inhibition of K 2 S 2 O 8 catalytic reduction and enhancement of C 3 N 4 reduction in the high-crystalline C 3 N 4 nanoflower, which can provide more opportunities for SO 4• − to react with electro-reduced C 3 N 4 • − , and a new "activity passivation ECL mechanism" was proposed, while the improvement of the stability is mainly ascribed to the long-range ordered atomic arrangements caused by structure stability in the high-crystalline C 3 N 4 nanoflower. As a benefit from the excellent ECL emission and stability of high-crystalline C 3 N 4 , the C 3 N 4 nanoflower/K 2 S 2 O 8 system was employed as a Cu 2+ detection sensing platform, which exhibited high sensitivity, excellent stability, and good selectivity with a wide linear range from 6 nM to 10 μM and a low detection limit of 1.8 nM.

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Impact of Defects and Disorder on the Stability of Ta₃N₅ Photoanodes

Wolz,

Grötzner,

Rieth

et al. 2024

Adv Funct Materials

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The photoelectrochemical performance of Ta3N5 photoanodes is strongly impacted by the presence of shallow and deep defects within the bandgap. However, the role of such states in defining stability under operational conditions is not well understood. Here, a highly controllable synthesis approach is used to create homogenous Ta3N5 thin films with tailored defect concentrations to establish the relationship between atomic‐scale point defects and macroscale stability. Reduced oxygen contents increase long‐range structural order but lead to high concentrations of deep‐level states, while higher oxygen contents result in reduced structural order but beneficially passivate deep‐level defects. Despite the different defect properties, the synthesized photoelectrodes degrade similarly under water oxidation conditions due to the formation of a surface oxide layer that blocks interfacial hole injection and accelerates charge recombination. In contrast, under ferrocyanide oxidation conditions, it is found that Ta3N5 films with high oxygen concentrations exhibit long‐term stability, whereas those possessing lower oxygen contents and higher deep‐level defect concentrations rapidly degrade. These results indicate that deep‐level defects result in rapid trapping of photocarriers and surface oxidation but that shallow oxygen donors can be introduced into Ta3N5 to enable kinetic stabilization of the interface.

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Insight into the regulation between crystallinity and oxygen vacancies of BiVO₄ affecting the photocatalytic oxygen evolution activity

Abstract: The surface defect structure and material crystallinity determine the catalytic activity and stability of the photocatalyst. In this work, decahedral BiVO4 nanoparticle with uniform size is synthesized by the solution-chemistry...

Cited by 9 publications

References 57 publications

Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Crystallization Regulation Engineering in the Carbon Nitride Nanoflower for Strong and Stable Electrochemiluminescence

Impact of Defects and Disorder on the Stability of Ta₃N₅ Photoanodes

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Insight into the regulation between crystallinity and oxygen vacancies of BiVO4 affecting the photocatalytic oxygen evolution activity

Abstract: The surface defect structure and material crystallinity determine the catalytic activity and stability of the photocatalyst. In this work, decahedral BiVO4 nanoparticle with uniform size is synthesized by the solution-chemistry...

Cited by 9 publications

References 57 publications

Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Electron Transfer Efficiency-Regulated Electrochemiluminescence for Rapid Crystallinity Analysis in Layered Materials

Crystallization Regulation Engineering in the Carbon Nitride Nanoflower for Strong and Stable Electrochemiluminescence

Impact of Defects and Disorder on the Stability of Ta3N5 Photoanodes

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Insight into the regulation between crystallinity and oxygen vacancies of BiVO₄ affecting the photocatalytic oxygen evolution activity

Impact of Defects and Disorder on the Stability of Ta₃N₅ Photoanodes