NH2-MIL-125(Ti)/TiO2 nanorod heterojunction photoanodes for efficient photoelectrochemical water splitting

Yoon, Ji Won; Kim, Do Hong; Kim, Jae Hyeok; Jang, Ho Won; Lee, Jong Heun

doi:10.1016/j.apcatb.2018.11.057

Cited by 157 publications

(45 citation statements)

References 48 publications

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“…In contrast, intra-molecular synergistic effects can be observed in different metal clusters of a multi-metallic MOF. 63 83 It was observed that Tibased MOF (MIL-125) possesses a more negative LUMO level than the TiO 2 conduction band edge, indicating the thermodynamic feasibility of injecting electrons from MIL-125 to TiO 2 . So, Zhang et al reported several photosensitizers based on Ti-MOFs on photoanode of TiO 2 for PEC water-splitting.…”

Section: Evaluation Parametersmentioning

confidence: 99%

“…Photocurrent density (reaches 1.63 mA/cm 2 at 1.23 V vs RHE under simulated sunlight illumination) was enhanced $2.7 times compared to pristine TiO 2 nanorods and IPCE was almost 84.4% of maximum absorption wavelength (λmax = 340 nm). 83 In pioneering research, hybrid type electrode was formed by nanoscaled NH 2 -MIL-125 (Ti) decorated on TiO 2 nanotube arrays (TNTAs). It was commissioned as the anode in the PEC water-splitting.…”

Section: F I G U R E 1mentioning

confidence: 99%

“…141 Garcia et al were the first to recognize that F I G U R E 1 4 JV curves for TiO 2 modified with MOF electrodes. (A) Replicated with consent 83 Copyright 2019 Elsevier, (B) 84 Exclusive rights 2015 John Wiley and Sons, (C) 87 Exclusive rights 2019 Elsevier, (D) 139 Exclusive rights 2013 Royal Society of Chemistry, (E) 140 Exclusive rights 2013 Elsevier, (F) 141 Exclusive rights 2020 Elsevier [Colour figure can be viewed at wileyonlinelibrary.com] Zr-containing MOF can be effectively utilized for photocatalytic hydrogen generation. Later, it was observed that graphene wrapping around NH 2 -MIL-125(Ti) through electrostatic interaction could develop contact between graphene and MOF.…”

Section: F I G U R E 1mentioning

confidence: 99%

“…Deposition of visible light receptive MOFs on semiconductors photoanodes is a feasible and favorable route to obtain highly efficient PEC water‐splitting catalysts. Heterostructures formed as a result would exhibit certain advantages over bare semiconductors, such as (a) visible light receptive MOF can provide more effective harvesting of the light spectrum, (b) porous structure of MOF would not hinder the optical absorption path of sensitized semiconductor, (c) photo‐excited electrons in the MOF structure can be effortlessly transported to sensitized semiconductor through well‐interconnected MOF/semiconductor interface resulting in accelerated charge transfer, and (iv) MOF can act as a protective layer to prevent leaching and aggregation of photosensitizer particles without hindering the diffusion of gases or ions resulting in enhanced photoanodes stability 83,88 . For instance, Dou et al constructed a composite catalyst by a combination of sensitized precious metal semiconductors (ZnO/M were M = ¼ Au, Pt, and Ag) with ZIF‐67 for enhanced performance for PEC water‐splitting.…”

Section: Recent Advances In Water‐splitting By Mof‐based Catalystsmentioning

confidence: 99%

“…In another study, amine‐functionalized MOF (MIL(125)‐NH 2 ) layer was uniformly coated on TiO 2 nanorods and the resultant heterojunction photoanodes were studied for PEC water‐splitting. Photocurrent density (reaches 1.63 mA/cm 2 at 1.23 V vs RHE under simulated sunlight illumination) was enhanced ~2.7 times compared to pristine TiO 2 nanorods and IPCE was almost 84.4% of maximum absorption wavelength (λmax = 340 nm) 83 . In pioneering research, hybrid type electrode was formed by nanoscaled NH 2 ‐MIL‐125(Ti) decorated on TiO 2 nanotube arrays (TNTAs).…”

Section: Recent Advances In Water‐splitting By Mof‐based Catalystsmentioning

confidence: 99%

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Recent advancements in MOF‐ based catalysts for applications in electrochemical and photoelectrochemical water splitting: A review

et al. 2020

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Summary A significant interest in the exploration of clean and renewable alternative energy resources has been observed in recent years to combat environmental pollution and energy shortages for a sustainable future. In this regard, hydrogen is clean, energy‐rich fuel with unlimited potential. It can be produced via water‐splitting process using the most abundant resources on earth, that is, water and solar/electrical energy. Metal‐organic frameworks (MOFs) are a category of porous crystalline materials with well‐organized structures and unique catalytic, optical, and electrical properties. MOFs and MOF‐derived materials have proved to be excellent catalysts for water‐splitting both by electrochemical and photoelectrochemical (PEC) routes. Furthermore, photochemical and electrochemical capabilities of these MOFs can be fine‐tuned to maximize their performance by modification in the bandgap, surface area, current density, electrochemical active surface area, and overpotential, through tailoring of the organic ligands and/or metal centers. A number of works have been dedicated to this quest resulting in promising and very effective results. Such as for photoelectrocatalysis, a composite nanorod array of TiO2/Co‐MOF acting as photoanode achieved one of the highest photocurrent densities of 2.93 mA/cm2 at 1.23 V (vs reverse hydrogen electrode [RHE]). In another study, MOF‐derived Co3C‐3/TiO2 photoanode attained the photocurrent density of 2.6 mA/cm2 at 1.23 V vs RHE. For electrocatalysis, Fe2O3/Ni‐MOF‐74 exhibited oxygen evolution reaction overpotential of 264 mV to reach 10 mA/cm2 of current density with a low Tafel plot of 48 mV/dec. Another novel material derived from MOF, MoO2‐PC‐rGO displayed a Tafel Plot of 41 mV/dec. Even though this field is in its infancy phase, it is attracting increased attention for promising results suggesting extraordinary potential for practical applications. Focus of this review article is on the overview of the development of MOFs for application in electrocatalytic and photoelectrocatalytic water‐splitting for hydrogen production. This review intends to provide a timely reference and insight for the advancement in catalysts based on MOFs for practical electrochemical and PEC water‐splitting in a clear and comprehensive manner. Starting with the brief introduction, fundamentals, factors affecting catalytic efficiency and evaluation parameters of water‐splitting are summarized followed by synthesis strategies and recent progress made by MOF‐based catalysts for PEC and electrochemical water‐splitting.

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Section: Evaluation Parametersmentioning

confidence: 99%

Section: F I G U R E 1mentioning

confidence: 99%

Section: F I G U R E 1mentioning

confidence: 99%

Section: Recent Advances In Water‐splitting By Mof‐based Catalystsmentioning

confidence: 99%

Section: Recent Advances In Water‐splitting By Mof‐based Catalystsmentioning

confidence: 99%

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Recent advancements in MOF‐ based catalysts for applications in electrochemical and photoelectrochemical water splitting: A review

et al. 2020

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Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

et al. 2021

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In practical applications, solar energy is usually converted to other forms of energy, such as electric energy, [9][10][11] chemical energy, [12,13] thermal energy, [14,15] so as to facilitate further transportation and storage. Among them, photoelectrochemical (PEC) reactions from water to hydrogen, CO 2 to C2+ products, and N 2 to NH 3 in the aqueous-based environment have been considered to be quite promising solar-chemical energy conversion pathways. [16][17][18][19] Unlike the traditional water electrolyzing system, the most ideal PEC reaction system can be selfdriven by illumination without external bias. Utilizing the electron-hole carriers generated from the semiconductor photoelectrode, redox reactions take place separately on the photocathode and photoanode. However, as the water oxidation reaction involves a complex four-proton coupled multi-electron process (2H 2 O + 4h + → O 2 + 4H + , E o = 1.23 V vs reversible hydrogen electrode (RHE)), it makes the water oxidation reaction the rate-control step in the watersplitting reaction. [20] Therefore, developing high-performance photo anodes is of great fundamental importance and interest.At the present stage, TiO 2 is the most studied and applied semiconductor photoelectrocatalyst, due to its outstanding chemical stability. [21][22][23] However, as a wide bandgap semiconductor (anatase TiO 2 : 3.2eV, rutile TiO 2 : 3.0 eV), TiO 2 can only respond to the ultraviolet light. Meanwhile, as an intrinsic semiconductor, the bulk/surficial carrier recombination of TiO 2 greatly hinders its practical application. [24][25][26][27] In that case, some narrow bandgap semiconductors are also applied as the photoanode materials, such as Ta 3 N 5 (bandgap 2.1 eV), [28,29] BiVO 4 (bandgap 2.4 eV), and α-Fe 2 O 3 (bandgap 2.1 eV). [30][31][32] However, many of these narrow bandgap materials suffer from poor chemical stability and sluggish interfacial charge injection. [33][34][35] As intrinsic semiconductor materials, both wide and narrow bandgap semiconductor photoanode materials are suffering from the poor bulk-phase carrier separation, intense surficial e − /h + trapping recombination, and sluggish electrode/electrolyte carrier injection kinetics. [36][37][38][39] Fortunately, with the continuous investment of researchers, a series of modification methods have been established and the PEC water oxidation performance of semiconductor photoanode materials has been significantly improved. [32,[40][41][42][43][44] Among various strategies, nanostructure-interface engineering is widely regarded as an effective method to improve the PEC water oxidation performance: [40,41] the light-harvesting performance can be enhanced by the widened optical Photoelectrochemical (PEC) water oxidation based on semiconductor materials plays an important role in the production of clean fuel and value-added chemicals. Nanostructure-interface engineering has proven to be an effective way to construct highly efficient PEC water oxidation photoanodes with good light capture, carrier transport, and ...

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MOF‐Based Hybrids for Solar Fuel Production

Yoon

Kim

et al. 2021

Advanced Energy Materials

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Solar fuel production, water splitting, and CO2 reduction by sunlight‐assisted catalytic reactions, are attractive and environmentally sustainable approaches used to generate energy. Since many different parameters, including energy band structures, electronic conductivity, surface area, porosity, catalytic activity, and stability of photocatalytic materials, determine the photocatalytic reaction, a single photocatalytic material is often insufficient to fulfill all the requirements. Hybridization to complement the limitations of two or more component materials can provide a viable solution. Particularly, hybridization with metal organic frameworks (MOFs), a new class of materials with excellent controllability of topology, surface area, porosity, morphology, band structure, electrical conductivity, and composition, enables the on‐demand design of a myriad of high‐performance photocatalysts. Moreover, hybrids formed by MOF‐derived materials inherit the distinctive merits from the MOF and offer further diversification for hybrid photocatalysts. Here, the rational design of MOF‐based hybrid photocatalysts for solar fuel production is discussed. The synthetic strategies of diverse MOF‐based hybrids, the key physicochemical parameters of hybrids to determine photocatalytic and photoelectrochemical reactions, and the mechanisms underlying the synergistic enhancement of solar fuel production are reviewed. Moreover, remaining challenges and future perspectives are addressed.

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NH2-MIL-125(Ti)/TiO2 nanorod heterojunction photoanodes for efficient photoelectrochemical water splitting

Cited by 157 publications

References 48 publications

Recent advancements in MOF‐ based catalysts for applications in electrochemical and photoelectrochemical water splitting: A review

Recent advancements in MOF‐ based catalysts for applications in electrochemical and photoelectrochemical water splitting: A review

Engineering Nanostructure–Interface of Photoanode Materials Toward Photoelectrochemical Water Oxidation

MOF‐Based Hybrids for Solar Fuel Production

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