Functional principle of the synergistic effect of co-loaded Co-Pi and FeOOH on Fe2O3 photoanodes for photoelectrochemical water oxidation

Xiao, Jingran; Fan, Longlong; Huang, Zhongliang; Zhong, Jun; Zhao, Feigang; Xu, Kaiji; Zhou, Shu‐Feng; Zhan, Guowu

doi:10.1016/s1872-2067(20)63618-x

Cited by 41 publications

(40 citation statements)

References 54 publications

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“…The charge separation and transfer characteristics at the interface between the photoelectrodes and the electrolyte were studied by electrochemical impedance spectroscopy (EIS). As displayed in Figure 3a, the equivalent circuit diagram composed of two parallelling circuits made up of capacitors and resistors in series is used to fit the test data, where the circuit with a relatively large resistance (R1) represents the electron transfer at the photoanode‐electrolyte interface and the smaller resistance (R2) represents the electron transfer at the bulk phase of the photoanode [18] . The arc radii follow the order of Fe 2 O 3 /FeOOH/poly‐Ru(bda)(vpy)<Fe 2 O 3 /FeOOH<Fe 2 O 3 /poly‐Ru(bda)(vpy)<Fe 2 O 3 , indicating an enhanced conductivity and improved interfacial charge transfer by including FeOOH.…”

Section: Methodsmentioning

confidence: 99%

A semiconductor/molecular catalyst hybrid photoanode with FeOOH as an electron transfer relay

Zhao

Liu

Zhu

et al. 2021

Chemistry An Asian Journal

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A Fe2O3/FeOOH/poly‐Ru(bda)(vpy) (bda = 2,2’‐bipyridine‐6,6’‐dicarboxylate,vpy = 4‐vinylpyridine) photoanode has been fabricated by electropolymerization of molecular Ru(bda)(vpy) catalyst on FeOOH modified Fe2O3, in which a thin layer of FeOOH replicates the role of tyrosine residue in PSII as an efficient electron transfer mediator. The ternary hybrid photoanode produced a 2.4 times higher photocurrent density than that of previously reported Fe2O3/poly‐Ru(bda)(vpy) under AM 1.5 G illumination and displayed a negative shift on the onset potential by 100 mV. In addition, the Fe2O3/FeOOH/poly‐Ru(bda)(vpy) exhibited long‐term stability for at least 10 h with a Faraday efficiency of ∼96%. The high performance shown here was attributed to the improved charge separation between excited semiconductor and the catalyst caused by FeOOH mediated electron transfer on the electrode surface.

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Section: Methodsmentioning

confidence: 99%

A semiconductor/molecular catalyst hybrid photoanode with FeOOH as an electron transfer relay

Zhao

Liu

Zhu

et al. 2021

Chemistry An Asian Journal

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“…Then Co-Pi thin film was prepared on the surface of the obtained FeOOH/Fe2O3 photoanode. After loading the dual promoter, the initial voltage of the photoanode was significantly reduced, and the Fe2O3 photoanode was highly improved 70 .…”

Section: Iron Oxyhydroxidesmentioning

confidence: 99%

Development of Iron-Based Heterogeneous Cocatalysts for Photoelectrochemical Water Oxidation

Li¹,

Hu²,

Huang³

et al. 2020

Acta Physico Chimica Sinica

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The use of fossil fuels has caused serious environmental problems such as air pollution and the greenhouse effect. Moreover, because fossil fuels are a non-renewable energy source, they cannot meet the continuously increasing demand for energy. Therefore, the development of clean and renewable energy sources is necessitated. Hydrogen energy is a clean, non-polluting renewable energy source that can ease the energy pressure of the whole society. The sunlight received by the Earth is 1.7 × 10 14 J in 1 s, which far exceeds the total energy consumption of humans in one year. Therefore, conversion of solar energy to valuable hydrogen energy is of significance for reducing the dependence on fossil fuels. Since Fujishima and Honda first reported on TiO2 in 1972, it has been discovered that semiconductors can generate clean, pollution-free hydrogen through water splitting driven by electricity or light. Hydrogen generated through this approach can not only replace fossil fuels but also provide environmentally friendly renewable hydrogen energy, which has attracted considerable attention. Photoelectrochemical (PEC) water splitting can use solar energy to produce clean, sustainable hydrogen energy. Because the oxygen evolution reaction (OER) over a photoanode is sluggish, the overall energy conversion efficiency is considerably low, limiting the practical application of PEC water splitting. A cocatalyst is, thus, necessary to improve PEC water splitting performance. So far, the synthesis of first-row transition-metal-based (e.g., Fe, Co, Ni, and Mn) cocatalysts has been intensively studied. Iron is earth-abundant and less toxic than other transition metals, making it a good cocatalyst. In addition, iron-based compounds exhibit the properties of a semiconductor/metal and have unique electronic structures, which can improve electrical conductivity and water adsorption. Various iron-based catalysts with high activity have been designed to improve the efficiency of PEC water oxidation. This article briefly summarizes the research progress related to the structure, synthesis, and application of iron oxyhydroxides, iron-based layered double hydroxides, and iron-based perovskites and discusses the evaluation of the performance of these cocatalysts toward photoelectrochemical water oxidation.

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“…They have staggered energy band structure and can form type II heterojunction. Under light excitation, for Fe 2 O 3 /FeOOH heterojunction, electrons in FeOOH conduction band could be transferred to Fe 2 O 3 conduction band, and holes in Fe 2 O 3 valence band could be transferred to FeOOH valence band [30] . This process could effectively improve the carrier separation efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…Constructing heterojunction is an efficient strategy, which could inhibit the recombination of charge carrier in Fe 2 O 3 photoanode by enhancing the electrons and holes separation [26–29] . The conduction band of FeOOH is higher than that of Fe 2 O 3 , and its valence band is lower than that of Fe 2 O 3 [30] . They have staggered energy band structure and can form type II heterojunction.…”

Section: Introductionmentioning

confidence: 99%

Fe₂O₃/FePO₄/FeOOH Ternary Stepped Energy Band Heterojunction Photoanode with Cascade‐Driven Charge Transfer and Enhanced Photoelectrochemical Performance

et al. 2022

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Controlling the charge transfer pathway in semiconductors is an important method to improve charge separation efficiency and enhance photoelectrochemical activity. In this work, a Fe2O3/FePO4/FeOOH nanorod photoanode with stepped energy band structure is prepared by a hydrothermal and water bath method. The charge separation efficiency of the ternary heterojunction is higher than that of the traditional type II heterojunction, which might be due to the efficient cascade charge transfer and separation effect of the ternary stepped energy band heterojunction. The H2 and O2 evolution rates for photoelectrochemical water splitting of Fe2O3/FePO4/FeOOH photoanode are 0.247 and 0.111 μmol min−1, which is 2.15 and 1.95 times that of the Fe2O3/FePO4 photoanode, respectively. The incident photocurrent efficiency (IPCE) of Fe2O3/FePO4/FeOOH photoanode under 365 nm light irradiation is 1.5 and 1.8 times that of Fe2O3/FePO4 and Fe2O3/FeOOH photoanodes, respectively. This work provides an attractive strategy for solar energy conversion to construct efficient photoelectrochemical photoanode materials.

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Functional principle of the synergistic effect of co-loaded Co-Pi and FeOOH on Fe2O3 photoanodes for photoelectrochemical water oxidation

Cited by 41 publications

References 54 publications

A semiconductor/molecular catalyst hybrid photoanode with FeOOH as an electron transfer relay

A semiconductor/molecular catalyst hybrid photoanode with FeOOH as an electron transfer relay

Development of Iron-Based Heterogeneous Cocatalysts for Photoelectrochemical Water Oxidation

Fe₂O₃/FePO₄/FeOOH Ternary Stepped Energy Band Heterojunction Photoanode with Cascade‐Driven Charge Transfer and Enhanced Photoelectrochemical Performance

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Functional principle of the synergistic effect of co-loaded Co-Pi and FeOOH on Fe2O3 photoanodes for photoelectrochemical water oxidation

Cited by 41 publications

References 54 publications

A semiconductor/molecular catalyst hybrid photoanode with FeOOH as an electron transfer relay

A semiconductor/molecular catalyst hybrid photoanode with FeOOH as an electron transfer relay

Development of Iron-Based Heterogeneous Cocatalysts for Photoelectrochemical Water Oxidation

Fe2O3/FePO4/FeOOH Ternary Stepped Energy Band Heterojunction Photoanode with Cascade‐Driven Charge Transfer and Enhanced Photoelectrochemical Performance

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Fe₂O₃/FePO₄/FeOOH Ternary Stepped Energy Band Heterojunction Photoanode with Cascade‐Driven Charge Transfer and Enhanced Photoelectrochemical Performance