Coupling effects of indium oxide layer on hematite enabling efficient photoelectrochemical water splitting

Yi, Shasha; Wang, Zeyuan; Li, Huamin; Zafar, Zaiba; Zhang, Zhongtao; Zhang, Liying; Chen, Deliang; Liu, Zhongyi; Yue, Xinzheng

doi:10.1016/j.apcatb.2020.119649

Cited by 70 publications

(30 citation statements)

References 39 publications

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“…In addition, the specific surface area of photoanodes may also be increased by constructing heterojunctions, which could enlarge the contact region between the photoanode and the electrolyte, strengthen light harvesting by compounding with a narrow gap semiconductor, and achieve performance improvements. [ 51 ] However, constructing a heterojunction is not a perfect solution that is profitable and harmless. There are still unavoidable problems in the process of constructing heterojunctions, which are not conducive to carrier transmission and separation, thereby affecting the PEC performance.…”

Section: Definition Of a Heterojunctionmentioning

confidence: 99%

Recent Progress on Semiconductor Heterojunction‐Based Photoanodes for Photoelectrochemical Water Splitting

Meng

et al. 2022

Small Science

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For photoelectrochemical (PEC) water splitting, the utilization of semiconductor heterojunctions as building blocks for photoanodes allows for high light absorption, effective charge separation, and superior redox capability, greatly boosting the solar energy conversion efficiency. This review mainly focuses on the construction of heterojunction photoanodes, improvement strategies of carrier transmission, and their application in PEC water splitting. First, a series of carrier dynamics characterization methods are introduced to reveal the principle and significance of promoting carrier transport in heterojunctions. Then, from the perspective of the mechanism of promoting the separation and transport of charge carriers, several strategies are summarized and analyzed, including the micro/nanostructure, energy band structure, photothermal effect, piezoelectric effect, pyroelectric effect, ferroelectric effect, and intermediate layer. Finally, the challenges and opportunities for heterojunction photoanodes in PEC reactions are explained clearly, which points the way forward for the development of heterojunctions.

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Section: Definition Of a Heterojunctionmentioning

confidence: 99%

Recent Progress on Semiconductor Heterojunction‐Based Photoanodes for Photoelectrochemical Water Splitting

Meng

et al. 2022

Small Science

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“…21−24 Recently, Yi et al reported that α-Fe 2 O 3 modified by the In 2 O 3 nanolayer has excellent performance, reaching a current density of 3.4 mA•cm −2 at 1.23 V vs reversible hydrogen electrode (RHE). 16 He et al designed the NiOOH/FeOOH/Co 3 O 4 /BiVO 4 photoanode, which has an excellent photocurrent density of 6.34 mA•cm −2 at 1.23 V vs RHE. 4 Theoretically, a maximum photocurrent density of 7.5 mA•cm −2 has been estimated from the PEC cell with an intrinsic BiVO 4 photoanode under full sun illumination (100 mW•cm −2 , AM 1.5G).…”

Section: Introductionmentioning

confidence: 96%

“…The landscape of research in solar photocatalysis has been rapidly changing in recent years, with a flurry of activity in the development and analysis of catalysts for PEC water oxidation − and fundamental studies of photocatalysis based on semiconductor surfaces. , Among a wide variety of photocatalysts pursued by researchers, metal oxides, such as TiO 2 , − α-Fe 2 O 3 , − WO 3 , − etc ., are promising materials as semiconductor photoelectrodes. Scheelite-monoclinic bismuth vanadate (BiVO 4 ), which exhibits a proper band gap of ∼2.4 eV for solar light absorption and suitable valence band edge position for oxygen evolution, has become one of the most attractive visible-light-driven photocatalysts for water oxidation. − Recently, Yi et al reported that α-Fe 2 O 3 modified by the In 2 O 3 nanolayer has excellent performance, reaching a current density of 3.4 mA·cm –2 at 1.23 V vs reversible hydrogen electrode (RHE) . He et al designed the NiOOH/FeOOH/Co 3 O 4 /BiVO 4 photoanode, which has an excellent photocurrent density of 6.34 mA·cm –2 at 1.23 V vs RHE .…”

Section: Introductionmentioning

confidence: 99%

Effect of a Cocatalyst on a Photoanode in Water Splitting: A Study of Scanning Electrochemical Microscopy

et al. 2021

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With a proper band gap of ∼2.4 eV for solar light absorption and suitable valence band edge position for oxygen evolution, scheelite-monoclinic bismuth vanadate (BiVO 4 ) has become one of the most attractive photocatalysts for efficient visible-light-driven photoelectrochemical (PEC) water splitting. Several studies have indicated that surface modification of BiVO 4 with a cocatalyst such as NiFe layered double hydroxide (LDH) can significantly increase the PEC water splitting performance of the catalyst. Herein, we experimentally investigated the charge transfer dynamics and charge carrier recombination processes by scanning electrochemical microscopy (SECM) with the feedback mode on the surface of BiVO 4 and BiVO 4 /NiFe-LDH as model samples. The ratio of rate constants for photogenerated hole (k h+ 0 ) to electron (k e− 0 ) via the photocatalyst of BiVO 4 /NiFe-LDH reacting with the redox couple is found to be five times larger than that of BiVO 4 under illumination. In this case, the ratio of the rate constants k h+ 0 /k e− 0 stands for the interfacial charge recombination process. This implies the cocatalyst NiFe-LDH suppresses the electron back transfer greatly and finally reduces the surface recombination. Control experiments with cocatalysts CoPi and RuO x onto BiVO 4 further verify this conclusion. Therefore, the SECM characterization allows us to make an overall analysis on the function of cocatalysts in the PEC water splitting system.

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“…Among various hybrids, photoelectric catalysis exhibits superior energy conversion efficiency and outstanding catalytic capacity [23][24][25]. In particular, owning to the interactions between the two routes, coupling of electrocatalysis with photocatalysis can enhance the amount of charge carriers and hinder the recombination of photogenerated electron-hole pairs [26][27][28]. However, traditional electrocatalysis confronts several defects, including large electricity consumption, harsh reaction conditions, and external power sources, which severely restrict its applications.…”

Section: Introductionmentioning

confidence: 99%

High-Efficiency Wastewater Purification System Based on Coupled Photoelectric–Catalytic Action Provided by Triboelectric Nanogenerator

Shen

Jia

et al. 2021

Nano-Micro Lett.

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It is of great importance to explore a creative route to improve the degradation efficiency of organic pollutants in wastewater. Herein, we construct a unique hybrid system by combining self-powered triboelectric nanogenerator (TENG) with carbon dots-TiO2 sheets doped three-dimensional graphene oxide photocatalyst (3DGA@CDs-TNs), which can significantly enhance the degradation efficiency of brilliant green (BG) and direct blue 5B (DB) owing to the powerful interaction of TENG and 3DGA@CDs-TNs photocatalyst. The power output of TENG can be applied for wastewater purification directly, which exhibits a self-powered electrocatalytic technology. Furthermore, the results also verify that TENG can replace conventional electric catalyst to remove pollutants effectively from wastewater without any consumption. Subsequently, the unstable fragments and the plausible removal pathways of the two pollutants are proposed. Our work sheds light on the development of efficient and sustainable TENG/photocatalyst system, opening up new opportunities and possibilities for comprehensive utilization of random energy.

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Coupling effects of indium oxide layer on hematite enabling efficient photoelectrochemical water splitting

Cited by 70 publications

References 39 publications

Recent Progress on Semiconductor Heterojunction‐Based Photoanodes for Photoelectrochemical Water Splitting

Recent Progress on Semiconductor Heterojunction‐Based Photoanodes for Photoelectrochemical Water Splitting

Effect of a Cocatalyst on a Photoanode in Water Splitting: A Study of Scanning Electrochemical Microscopy

High-Efficiency Wastewater Purification System Based on Coupled Photoelectric–Catalytic Action Provided by Triboelectric Nanogenerator

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