Engineering efficient hole transport layer Ferrihydrite-MXene on BiVO4 photoanodes for photoelectrochemical water splitting: Work function and conductivity regulated

Bai, Weihao; Zhou, Ye; Peng, Gang; Wang, Jinnan; Li, Aimin; Corvini, Philippe F.-X.

doi:10.1016/j.apcatb.2022.121606

Cited by 67 publications

(30 citation statements)

References 52 publications

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“…Moreover, the overpotential of TS (24) -P (50) -V 2 C is much lower than that of Ni-foam. Therefore, the results of the hydrogen evolution reaction prove that rich porosity and lattice tensile strain have a significant influence on the catalytic capacity. − Besides, TS (24) -P (50) -V 2 C demonstrates enhanced HER behavior compared to those reported for FeNi@Mo 2 TiC 2 T x @NF (165 mV), MoS 2 @Mo 2 CT x (176 mV), NiCo-LDH/Ti 3 C 2 T x /NF (233 mV), and NiFe 2 O 4 /Ti 3 C 2 (173 mV) (Figure S3). …”

Section: Resultsmentioning

confidence: 84%

Novel Strain Engineering Combined with a Microscopic Pore Synergistic Modulated Strategy for Designing Lattice Tensile-Strained Porous V₂C-MXene for High-Performance Overall Water Splitting

Zhou

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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Transition metal carbon/nitride (MXene) holds immense potential as an innovative electrocatalyst for enhancing the overall water splitting properties. Nevertheless, the re-stacking nature induced by van der Waals force remains a significant challenge. In this work, the lattice tensile-strained porous V 2 C-MXene (named as TS (24) -P (50) -V 2 C) is successfully constructed via the rapid spray freezing method and the following hydrothermal treatment. Besides, the influence of lattice strain degree and microscopic pores on the catalytic ability is reviewed and explored systematically. The lattice tensile strain within V 2 C-MXene could widen the interlayer spacing and accelerate the ion transfer. The microscopic pores could change the ion transmission path and shorten the migration distance. As a consequence, the obtained TS (24) -P (50) -V 2 C shows extraordinary hydrogen evolution reaction and oxygen evolution reaction activity with the overpotential of 154 and 269 mV, respectively, at the current density of 10 mA/cm 2 , which is quite remarkable compared to the MXene-based electrocatalysts. Moreover, the overall water splitting device assembled using TS (24) -P (50) -V 2 C as both anode and cathode demonstrates a low cell voltage requirement of 1.57 V to obtain 10 mA/cm 2 . Overall, the implementation of this work could offer an exciting avenue to overcome the re-stacking issue of V 2 C-MXene, affording a highefficiency electrocatalyst with superior catalytic activity and desirable reaction kinetics.

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Section: Resultsmentioning

confidence: 84%

Novel Strain Engineering Combined with a Microscopic Pore Synergistic Modulated Strategy for Designing Lattice Tensile-Strained Porous V₂C-MXene for High-Performance Overall Water Splitting

Zhou

Guo

et al. 2023

ACS Appl. Mater. Interfaces

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“…For instance, a ferrihydrite HTL largely restrained photocorrosion of Ta 3 N 5 photoanodes, exhibiting a sustainable water oxidation process . Recently, MoO x /MXene HTLs were developed to efficiently promote hole transfer and accelerate water-splitting kinetics in the OEC/MoO x /MQD/BiVO 4 photoanode, leading to significantly enhanced photocurrent densities and stability for PEC water splitting . Therefore, modification of the OEC/BiVO 4 interfaces with an appropriate HTL would be an effective approach to reduce interfacial charge recombination, allowing more photogenerated holes to participate in the water oxidation reaction.…”

Section: Introductionmentioning

confidence: 99%

“…33 Recently, MoO x /MXene HTLs were developed to efficiently promote hole transfer and accelerate water-splitting kinetics in the OEC/MoO x /MQD/BiVO 4 photoanode, leading to significantly enhanced photocurrent densities and stability for PEC water splitting. 37 Therefore, modification of the OEC/BiVO 4 interfaces with an appropriate HTL would be an effective approach to reduce interfacial charge recombination, allowing more photogenerated holes to participate in the water oxidation reaction. A p-type semiconductor having OEC functions can simultaneously enhance the hole transportation and water oxidation capabilities of BiVO 4 photoanodes.…”

Section: ■ Introductionmentioning

confidence: 99%

Engineering BiVO₄ and Oxygen Evolution Cocatalyst Interfaces with Rapid Hole Extraction for Photoelectrochemical Water Splitting

Zhang

Liu

et al. 2023

ACS Catal.

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Tailoring the oxygen evolution cocatalyst (OEC)/BiVO4 interfaces with a hole transfer layer (HTL) is expected to suppress the interfacial charge recombination, thus achieving highly efficient photoelectrochemical (PEC) water splitting. Herein, Co3O4 nanoparticles are inserted between the NiOOH OEC and BiVO4 as an HTL for the design of NiOOH/Co3O4/BiVO4 photoanodes. A champion photoanode achieves a photocurrent density of 6.4 mA cm–2 at 1.23 V versus the reversible hydrogen electrode (RHE) under AM 1.5 G illumination (100 mW cm–2). Stable PEC water splitting is realized for up to 90 h. Being highly dispersed at the surfaces of BiVO4, the p-type Co3O4 nanoparticles form p–n junctions with BiVO4, thus providing an extra driving force for the extraction of the photogenerated holes from BiVO4 to the NiOOH OEC, which efficiently suppresses charge recombination at the BiVO4/NiOOH interfaces and accelerates the surface water oxidation kinetics. A charge separation efficiency of 95.6% and a surface charge transfer efficiency of 97.7% are achieved at 1.23 V vs RHE. The strategy is applicable to other OEC (e.g., MnO x and FeOOH)/BiVO4 photoanodes. This work may inspire the rational design of high-performance photoanodes for feasible solar energy conversion.

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“…More importantly, the MXene:Nafion layer simultaneously achieved the functions of defect passivation and carrier selective transmission, leading to a MXene:Nafion-Si heterojunction solar cell with a PCE of 14.21% at the area of 7.29 cm 2 . [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51]…”

mentioning

confidence: 99%

“…c) Ultraviolet photoelectron spectroscopy (UPS) of MXene and MXene:Nafion films. d) Work functions statistics of some MXene materials reported in the years 2016 to 2022 [36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51].…”

mentioning

confidence: 99%

Large Area and High‐Efficiency MXene–Silicon Solar Cells by Organic Enhanced Dispersity and Work Function

et al. 2022

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2D transition metal carbides and nitrides (MXenes), as an emerging class of 2D materials, [1,2] have gained significant attention in recent years. MXenes are usually obtained by etching the "A" layer from its parent ternary MAX phase, expressed by the formula M n þ 1 X n T x , where M stands for an early transition metal (Ti, Mo, Nb, or V), X stands for carbide (C) or nitride (N) or both, and T x denotes surface terminated functional groups (F, OH, and O). [3] Because of their good hydrophilicity, abundant surface functional groups, high conductivity, excellent photothermal and photoelectric effects, and so on, MXenes were widely used in electromagnetic shielding, [4,5] electrochemical energy storage, [6] photodetectors, [7] biomedicine, [8] separation, [9] sensors [10] and seawater desalination, [11] and other fields.In addition to these applications, given their attractive electrical conductivity and transparency, MXene films have also been demonstrated to be able to substitute the traditional expensive transparent conducting electrodes in photovoltaic (PV) devices. [12][13][14][15][16][17] For example, Yang et al. report on the use of pure MXene layer as an electron transport layer (ETL) in perovskite solar cell (PSC), and achieved the champion power conversion efficiency (PCE) of 18.34%. [12] Yu et al. by using a UV ozone treatment or through a treatment with N 2 H 4 , thus tuned the work function of Ti 3 C 2 T x MXene in a range from 4.08 to 4.95 eV. Then the MXene films with different work functions are studied as the electron and hole collection buffer materials of organic solar cells. [13] In fact, the work function of MXene can be theoretically adjusted from less than 2.0 eV to more than 6.0 eV, which illustrated that MXene was a potential candidate as a hole-selective contact layer in silicon (Si) solar cells. The first MXene-contacted Si solar cell was devised by Fu et al. in 2019. They reported that the formation of an Ohmic junction of the metallic MXene to the n þ -Si surface can effectively extract the photogenerated electrons, reduce the contact resistance, and inhibit the charge carrier recombination, giving the devices the highest PCE of 11.5% with an area of 1.21 cm 2 . [14] Yu et al. also showed that the Ti 3 C 2 T x can facilitate the charge separation at the MXene-Si heterojunction, and obtained an efficiency of 10.98% with an area of 0.087 cm 2 . [15] Recently, Yao et al.

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Engineering efficient hole transport layer Ferrihydrite-MXene on BiVO4 photoanodes for photoelectrochemical water splitting: Work function and conductivity regulated

Cited by 67 publications

References 52 publications

Novel Strain Engineering Combined with a Microscopic Pore Synergistic Modulated Strategy for Designing Lattice Tensile-Strained Porous V₂C-MXene for High-Performance Overall Water Splitting

Novel Strain Engineering Combined with a Microscopic Pore Synergistic Modulated Strategy for Designing Lattice Tensile-Strained Porous V₂C-MXene for High-Performance Overall Water Splitting

Engineering BiVO₄ and Oxygen Evolution Cocatalyst Interfaces with Rapid Hole Extraction for Photoelectrochemical Water Splitting

Large Area and High‐Efficiency MXene–Silicon Solar Cells by Organic Enhanced Dispersity and Work Function

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Engineering efficient hole transport layer Ferrihydrite-MXene on BiVO4 photoanodes for photoelectrochemical water splitting: Work function and conductivity regulated

Cited by 67 publications

References 52 publications

Novel Strain Engineering Combined with a Microscopic Pore Synergistic Modulated Strategy for Designing Lattice Tensile-Strained Porous V2C-MXene for High-Performance Overall Water Splitting

Novel Strain Engineering Combined with a Microscopic Pore Synergistic Modulated Strategy for Designing Lattice Tensile-Strained Porous V2C-MXene for High-Performance Overall Water Splitting

Engineering BiVO4 and Oxygen Evolution Cocatalyst Interfaces with Rapid Hole Extraction for Photoelectrochemical Water Splitting

Large Area and High‐Efficiency MXene–Silicon Solar Cells by Organic Enhanced Dispersity and Work Function

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Novel Strain Engineering Combined with a Microscopic Pore Synergistic Modulated Strategy for Designing Lattice Tensile-Strained Porous V₂C-MXene for High-Performance Overall Water Splitting

Novel Strain Engineering Combined with a Microscopic Pore Synergistic Modulated Strategy for Designing Lattice Tensile-Strained Porous V₂C-MXene for High-Performance Overall Water Splitting

Engineering BiVO₄ and Oxygen Evolution Cocatalyst Interfaces with Rapid Hole Extraction for Photoelectrochemical Water Splitting