Fe2O3 hierarchical tubular structure decorated with cobalt phosphide (CoP) nanoparticles for efficient photoelectrochemical water splitting

Quang, Nguyen Duc; Hu, Weiguang; Chang, Hyo Sik; Van, Phuoc Cao; Viet, Duc Duong; Jeong, Jong‐Ryul; Seo, Dong‐Bum; Kim, Eui‐Tae; Kim, Chunjoong; Kim, Dojin

doi:10.1016/j.cej.2021.129278

Cited by 49 publications

(16 citation statements)

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“…It can be told that two peaks located at 727.2 eV and 713.8 eV with a typical spin-orbit splitting of 13.4 eV due to Fe 3 + 2p 1/2 and Fe 3 + 2p 3/2 were emerged, which were consistent with the feature of α-Fe 2 O 3 , demonstrating the existence of Fe 3 + in 17 % V-α-Fe 2 O 3 and α-Fe 2 O 3 . [22][23][24] Meanwhile, two peaks located at 724.4 eV and 711.0 eV which are indexed to Fe 2 + were also observed, [22,25,26] revealing the coexistence of Fe 3 + and Fe 2 + in 17 % V-α-Fe 2 O 3 and α-Fe 2 O 3 . Of note, the relative ratio of Fe 2 + /Fe 3 + was also calculated by comparing the area that are covered by the fitted curves.…”

Section: Resultsmentioning

confidence: 92%

Cation Decorated Ferric Oxide with a Polyhedral‐like Structure for the Electrocatalytic Nitrogen Reduction Reaction

et al. 2021

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Considerable efforts have been devoted to electrocatalytic reaction of N 2 to NH 3 driven by the broad demand of ammonia and the disadvantages of the Haber-Bosch process. Unfortunately, the difficult adsorption of nitrogen molecules and the permanent dipole of N�N vastly inhibit its practical application. Historically, the ferric oxide (Fe 2 O 3 ) has inferior nitrogen reduction reaction (NRR) activity among transition compounds due to the unfavorable band gap and scarce active center. Considering the fact that the electronic properties and morphology character could be well-tuned brought by the incorporation of heteroatoms, we report vanadium atom decorated ferric oxide (named as V-α-Fe 2 O 3 ) with a polyhedrallike structure as an innovative catalyst for fast nitrogen reduction reaction. Benefiting from the incorporation of vanadium atoms, the electronic structure and active center of α-Fe 2 O 3 were well-optimized, with enhanced NRR activity being obtained. The as-synthesized 17 % V-α-Fe 2 O 3 exhibits excellent catalytic activity that the Faradaic efficiency is 5.7 % and the NH 3 yield is 68.7 μg h À 1 mg À 1 cat. at À 0.2 V (vs. RHE) in 0.1 M HCl. This work reported an approach to synthesize the enhanced catalysts even realizing the efficient application of NRR in the near future.

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Section: Resultsmentioning

confidence: 92%

Cation Decorated Ferric Oxide with a Polyhedral‐like Structure for the Electrocatalytic Nitrogen Reduction Reaction

et al. 2021

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“…Advances in hydrogen production using visible-light photocatalysts from water have been achieved by combining photocatalyst material with sulfides [ 88 , 89 ], nitrides [ 82 , 90 ], carbides [ 91 , 92 ], and phosphides [ 93 , 94 ]. After combination, a more efficient photocatalyst is achieved that can produce hydrogen at a higher rate.…”

Section: Modern Developments In Photocatalysts For High-kinetic Water...mentioning

confidence: 99%

Semiconductor Nanomaterial Photocatalysts for Water-Splitting Hydrogen Production: The Holy Grail of Converting Solar Energy to Fuel

et al. 2023

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Nanomaterials have attracted attention for application in photocatalytic hydrogen production because of their beneficial properties such as high specific surface area, attractive morphology, and high light absorption. Furthermore, hydrogen is a clean and green source of energy that may help to resolve the existing energy crisis and increasing environmental pollution caused by the consumption of fossil fuels. Among various hydrogen production methods, photocatalytic water splitting is most significant because it utilizes solar light, a freely available energy source throughout the world, activated via semiconductor nanomaterial catalysts. Various types of photocatalysts are developed for this purpose, including carbon-based and transition-metal-based photocatalysts, and each has its advantages and disadvantages. The present review highlights the basic principle of water splitting and various techniques such as the thermochemical process, electrocatalytic process, and direct solar water splitting to enhance hydrogen production. Moreover, modification strategies such as band gap engineering, semiconductor alloys, and multiphoton photocatalysts have been reviewed. Furthermore, the Z- and S-schemes of heterojunction photocatalysts for water splitting were also reviewed. Ultimately, the strategies for developing efficient, practical, highly efficient, and novel visible-light-harvesting photocatalysts will be discussed, in addition to the challenges that are involved. This review can provide researchers with a reference for the current state of affairs, and may motivate them to develop new materials for hydrogen generation.

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“…[7][8][9][10] To date, semiconductor photoelectrodes have shown great potential for efficient solar energy conversion. [11][12][13][14] In a variety of semiconductor materials, hematite (Fe 2 O 3 ) is a promising photoanode material because of its narrow bandgap (~2.0 eV), [15][16][17][18] outstanding chemical stability in alkaline electrolyte, nontoxicity for human, and abundance in the earth. [19] The theoretical research shows that the highest solar-to-hydrogen efficiency of Fe 2 O 3 can reach up to 16.8 %.…”

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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Fe2O3 hierarchical tubular structure decorated with cobalt phosphide (CoP) nanoparticles for efficient photoelectrochemical water splitting

Cited by 49 publications

References 50 publications

Cation Decorated Ferric Oxide with a Polyhedral‐like Structure for the Electrocatalytic Nitrogen Reduction Reaction

Cation Decorated Ferric Oxide with a Polyhedral‐like Structure for the Electrocatalytic Nitrogen Reduction Reaction

Semiconductor Nanomaterial Photocatalysts for Water-Splitting Hydrogen Production: The Holy Grail of Converting Solar Energy to Fuel

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

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Fe2O3 hierarchical tubular structure decorated with cobalt phosphide (CoP) nanoparticles for efficient photoelectrochemical water splitting

Cited by 49 publications

References 50 publications

Cation Decorated Ferric Oxide with a Polyhedral‐like Structure for the Electrocatalytic Nitrogen Reduction Reaction

Cation Decorated Ferric Oxide with a Polyhedral‐like Structure for the Electrocatalytic Nitrogen Reduction Reaction

Semiconductor Nanomaterial Photocatalysts for Water-Splitting Hydrogen Production: The Holy Grail of Converting Solar Energy to Fuel

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