Ni2P nanocrystals modification on Ta:α-Fe2O3 photoanode for efficient photoelectrochemical water splitting: In situ formation and synergistic catalysis of Ni2P@NiOOH cocatalyst

Cao, Xing; Wen, Peng; Ma, Rui; Liu, Ya; Sun, Shichang; Ma, Qiang; Zhang, Peixin; Qiu, Yejun

doi:10.1016/j.cej.2022.137792

Cited by 54 publications

(29 citation statements)

References 59 publications

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“…28 O 1s spectra are deconvoluted into three peaks, which are corresponding to the lattice oxygen (529.9 eV), surface OH − group (531.5 eV) and physically absorbed H 2 O (532.6 eV). 29 Compared to the bare Fe 2 O 3 , peaks in Fe 2p and O 1s spectrum of Fe 2 O 3 −S have shifted toward a little higher binding energy by around 0.4 and 0.2 eV, respectively, which might be in consequence of the amorphous FeO x layer. 4 The increased binding energy is generally considered to be caused by the loss of electrons, 30 which implies electrons are transferred from Fe 2 O 3 to the FeO x overlayer.…”

Section: ■ Results and Discussionmentioning

confidence: 90%

Amorphous FeO_x Overlayer Coupled with Co₃O₄ Nanoparticles Passivating Hematite Photoanodes for Water Oxidation

Liang

Jiang

et al. 2023

ACS Appl. Nano Mater.

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Hematite is a significant material for photoanodes in catalytic water oxidation. Modification overlayers play an important role in improving the activity of the hematite photoanode, which suffers serious recombination by inevitable surface defects. Herein, a thin amorphous FeO x overlayer was spin-coated on Fe 2 O 3 nanorods. The photoanode reached a 1.7-fold increase in current density, and the modification improved the injection efficiency principally. A more effective functional overlayer was constructed by subsequently depositing Co 3 O 4 nanoparticles, which achieved a higher photocurrent of 1.39 mA cm −2 at 1.23 V RHE and a cathodic 80 mV shift of the onset potential. Based on electrochemical and charge kinetics characterization, the FeO x overlayer is found to passivate the surface traps, favoring charge transfer through the electrode−electrolyte interface, thus reducing the recombination. With the aid of the p−n heterojunction between Co 3 O 4 and Fe 2 O 3 and the strengthened passivation effect, the reaction kinetics was further enhanced by the deposition of Co 3 O 4 . The facile fabrication of the FeO x overlayer and the application of synergetic overlayers for hematite photoanodes consisting of passivation layers or multiple cocatalysts are inspiring and promising for future modification research.

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Section: ■ Results and Discussionmentioning

confidence: 90%

Amorphous FeO_x Overlayer Coupled with Co₃O₄ Nanoparticles Passivating Hematite Photoanodes for Water Oxidation

Liang

Jiang

et al. 2023

ACS Appl. Nano Mater.

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“…130 Qiu et al reported the in situ formation of NiOOH on the Ni 2 P surface to construct a core–shell structure for PEC water oxidation, and the coupling of the high electrical conductivity of Ni 2 P nanocrystals with high oxygen evolution activity of NiOOH for guaranteeing the enhancement of OER activity of the hematite photoanode. 131 These studies illustrate the versatility and importance of the multi-component synergy of OER catalysts for the design and construction of PEC photoanodes. Furthermore, the representative PEC performances of typical photoanodes were briefly described here.…”

Section: The Structure Optimization Of Oer Catalysts In Pec Water Oxi...mentioning

confidence: 89%

Advanced oxygen evolution reaction catalysts for solar-driven photoelectrochemical water splitting

Yan

2023

J. Mater. Chem. A

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“…A remarkable photoelectrode material should have advantages such as efficient charge separation efficiency and fast charge transfer characteristics. At present, researchers have developed many semiconductor materials, such as metal oxides (α-Fe 2 O 3, TiO 2, ZnO, and WO 3 ), metal sulfides (CdS and MoS 2 ), and non-metallic materials (g-C 3 N 4 ). The advantages and disadvantages of semiconductor materials are known to coexist, which leads to many problems in the application of PEC water splitting.…”

Section: Introductionmentioning

confidence: 99%

Modulation of Lewis and Brønsted Acidic Sites to Enhance the Redox Ability of Nb₂O₅ Photoanodes for Efficient Photoelectrochemical Performance

Ruan

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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Accelerated surface redox reaction and regulated carrier separation are the crux to the development of highly reactive oxide semiconductors for efficient photoelectrochemical water splitting. Here, we have selected Nb2O5 materials that combine unique surface acidity and semiconductor properties, and first used surface phosphorylation to change its surface acidic sites (Lewis and Brønsted acidic sites) to achieve efficient photoelectrochemical water splitting. The resulting photoanode born from this strategy exhibits a high photocurrent density of 0.348 mA/cm2 at 1.23 VRHE, which is about 2-fold higher than that of the bare Nb2O5, and a cathodic shift of 60 mV. Detailed experimental results show that the large increase in the Lewis acidic site can effectively modulate the electronic structure of the active sites involved in catalysis in [NbO5] polyhedra and promote the activation of lattice oxygen. As a result, higher redox properties and the ability to inhibit carrier recombination are exhibited. In addition, the weakening of the Brønsted acidic site drives the reduction of protons in the oxygen evolution reaction (OER) and accelerates the reaction kinetics. This work advances the development of efficient photoelectrochemical water splitting on photoanodes driven by the effective use of surface acidity and provides a strategy for enhancing redox capacity to achieve highly active photoanodes.

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Ni2P nanocrystals modification on Ta:α-Fe2O3 photoanode for efficient photoelectrochemical water splitting: In situ formation and synergistic catalysis of Ni2P@NiOOH cocatalyst

Cited by 54 publications

References 59 publications

Amorphous FeO_x Overlayer Coupled with Co₃O₄ Nanoparticles Passivating Hematite Photoanodes for Water Oxidation

Amorphous FeO_x Overlayer Coupled with Co₃O₄ Nanoparticles Passivating Hematite Photoanodes for Water Oxidation

Advanced oxygen evolution reaction catalysts for solar-driven photoelectrochemical water splitting

Modulation of Lewis and Brønsted Acidic Sites to Enhance the Redox Ability of Nb₂O₅ Photoanodes for Efficient Photoelectrochemical Performance

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Ni2P nanocrystals modification on Ta:α-Fe2O3 photoanode for efficient photoelectrochemical water splitting: In situ formation and synergistic catalysis of Ni2P@NiOOH cocatalyst

Cited by 54 publications

References 59 publications

Amorphous FeOx Overlayer Coupled with Co3O4 Nanoparticles Passivating Hematite Photoanodes for Water Oxidation

Amorphous FeOx Overlayer Coupled with Co3O4 Nanoparticles Passivating Hematite Photoanodes for Water Oxidation

Advanced oxygen evolution reaction catalysts for solar-driven photoelectrochemical water splitting

Modulation of Lewis and Brønsted Acidic Sites to Enhance the Redox Ability of Nb2O5 Photoanodes for Efficient Photoelectrochemical Performance

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Amorphous FeO_x Overlayer Coupled with Co₃O₄ Nanoparticles Passivating Hematite Photoanodes for Water Oxidation

Amorphous FeO_x Overlayer Coupled with Co₃O₄ Nanoparticles Passivating Hematite Photoanodes for Water Oxidation

Modulation of Lewis and Brønsted Acidic Sites to Enhance the Redox Ability of Nb₂O₅ Photoanodes for Efficient Photoelectrochemical Performance