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Jo SY, Bae JY, Park JY, Kim MK, Chae WS, Kim YI, Nam KM. Thermomechanical and Structural Analysis of WO 3 Array for Optimized Photoelectrochemical Chloride Oxidation Performance. ACS APPLIED MATERIALS & INTERFACES 2024; 16:54864-54872. [PMID: 39324543 DOI: 10.1021/acsami.4c11794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/27/2024]
Abstract
Understanding the crystal structure of WO3 is essential for optimizing its photoelectrochemical performance. This study comprehensively analyzes the structural characteristics of WO3 during synthesis and investigates their correlation with photoelectrochemical activity. Structural analysis, incorporating annealing procedure and WO3 thickness, identifies a blend of hexagonal, monoclinic, and orthorhombic phases within WO3 array. Specifically, detailed analysis reveals a predominance of monoclinic WO3 phase alongside the orthorhombic WO3 phase, both of which are commonly characterized by their monoclinic structure. Three-dimensional thermomechanical simulations using the finite element method reveal that thermal displacement in WO3 layers increases with thickness during the thermally induced synthesis process. These results highlight a direct correlation between WO3 thickness, thermal displacement, and phase transition, with thicker layers favoring the transformation from orthorhombic to monoclinic structures due to increased thermally induced deformation. The heightened monoclinic structure, which possesses lower symmetry than the orthorhombic structure, induces more defect sites, suggesting increased donor density. Notably, the monoclinic-dominated WO3 exhibits superior performance under UV-visible irradiation in 0.5 M NaCl. Furthermore, the WO3 array demonstrates over 85% Faradaic efficiency for chloride oxidation, indicating preferential selectivity over oxygen evolution reaction in 0.5 M NaCl. This study emphasizes the pivotal role of the crystal structure of WO3 in achieving efficient photoelectrochemical seawater splitting.
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Affiliation(s)
- So Yeong Jo
- Department of Chemistry and Institute for Future Earth, Pusan National University, Geumjeong-gu, Busan 46241, Republic of Korea
| | - Ji Yong Bae
- Center for Scientific Instrumentation, Division of Scientific Instrumentation and Management, Korea Basic Science Institute (KBSI), Yuseong, Daejeon 34113, Republic of Korea Department
| | - Joon Yong Park
- Department of Chemistry and Institute for Future Earth, Pusan National University, Geumjeong-gu, Busan 46241, Republic of Korea
| | - Min Kyo Kim
- Department of Chemistry and Institute for Future Earth, Pusan National University, Geumjeong-gu, Busan 46241, Republic of Korea
| | - Weon-Sik Chae
- Daegu Center, Korea Basic Science Institute, Daegu, 41566, Republic of Korea
| | - Yong-Il Kim
- Korea Research Institute of Standards and Science (KRISS), 267 Gajeong, Yuseong, Daejeon 34113, Republic of Korea
| | - Ki Min Nam
- Department of Chemistry and Institute for Future Earth, Pusan National University, Geumjeong-gu, Busan 46241, Republic of Korea
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2
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Zhao F, Xu Z, Suo S, Lin L, Hill CL, Musaev DG, Lian T. A contactless in situ EFISH method for measuring electrostatic potential profile of semiconductor/electrolyte junctions. J Chem Phys 2024; 161:094703. [PMID: 39225528 DOI: 10.1063/5.0226128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2024] [Accepted: 08/12/2024] [Indexed: 09/04/2024] Open
Abstract
In photoelectrochemical cells, promising devices for directly converting solar energy into storable chemical fuels, the spatial variation of the electrostatic potential across the semiconductor-electrolyte junction is the key parameter that determines the cell performance. In principle, electric field induced second harmonic generation (EFISH) provides a contactless in situ spectroscopic tool to measure the spatial variation of electrostatic potential. However, the total second harmonic generation (SHG) signal contains the contributions of the EFISH signals of semiconductor space charge layer and the electric double layer, in addition to the SHG signal of the electrode surface. The interference of these complex quantities hinders their analysis. In this work, to understand and deconvolute their contributions to the total SHG signals, bias-dependent SHG measurements are performed on the rutile TiO2(100)-electrolyte junction as a function of light polarization and crystal azimuthal angle (angle of the incident plane relative to the crystal [001] axis). A quadratic response between SHG intensity and the applied potential is observed in both the accumulation and depletion regions of TiO2. The relative phase difference and amplitude ratio are extracted at selected azimuthal angles and light polarizations. At 0° azimuthal angle and s-in-p-out polarization, the SHG intensity minimum has the best match with the TiO2 flatband potential due to the orthogonal relative phase difference between bias-dependent and bias-independent SHG terms. We further measure the pH-dependent flatband potential and probe the photovoltage under open circuit conditions using the EFISH technique, demonstrating the capability of this contactless method for measuring electrostatic potential at semiconductor-electrolyte junctions.
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Affiliation(s)
- Fengyi Zhao
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
| | - Zihao Xu
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
| | - Sa Suo
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
| | - Lu Lin
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
| | - Craig L Hill
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
| | - Djamaladdin G Musaev
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
- Cherry L. Emerson Centre for Scientific Computation, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, USA
| | - Tianquan Lian
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA
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3
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Yue JY, Luo JX, Pan ZX, Zhang RZ, Yang P, Xu Q, Tang B. Regulating the Topology of Covalent Organic Frameworks for Boosting Overall H 2O 2 Photogeneration. Angew Chem Int Ed Engl 2024; 63:e202405763. [PMID: 38607321 DOI: 10.1002/anie.202405763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Revised: 04/11/2024] [Accepted: 04/12/2024] [Indexed: 04/13/2024]
Abstract
Photocatalytic oxygen reduction reactions and water oxidation reactions are extremely promising green approaches for massive H2O2 production. Nonetheless, constructing effective photocatalysts for H2O2 generation is critical and still challenging. Since the network topology has significant impacts on the electronic properties of two dimensional (2D) polymers, herein, for the first time, we regulated the H2O2 photosynthetic activity of 2D covalent organic frameworks (COFs) by topology. Through designing the linking sites of the monomers, we synthesized a pair of novel COFs with similar chemical components on the backbones but distinct topologies. Without sacrificial agents, TBD-COF with cpt topology exhibited superior H2O2 photoproduction performance (6085 and 5448 μmol g-1 h-1 in O2 and air) than TBC-COF with hcb topology through the O2-O2⋅--H2O2, O2-O2⋅--O2 1-H2O2, and H2O-H2O2 three paths. Further experimental and theoretical investigations confirmed that during the H2O2 photosynthetic process, the charge carrier separation efficiency, O2⋅- generation and conversion, and the energy barrier of the rate determination steps in the three channels, related to the formation of *OOH, *O2 1, and *OH, can be well tuned by the topology of COFs. The current study enlightens the fabrication of high-performance photocatalysts for H2O2 production by topological structure modulation.
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Affiliation(s)
- Jie-Yu Yue
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, P. R. China
| | - Jing-Xian Luo
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, P. R. China
| | - Zi-Xian Pan
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, P. R. China
| | - Rui-Zhi Zhang
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, P. R. China
| | - Peng Yang
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, P. R. China
| | - Qing Xu
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute (SARI), Chinese Academy of Sciences (CAS), Shanghai, 201210, P. R. China
| | - Bo Tang
- Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, 250014, P. R. China
- Laoshan Laboratory, Qingdao, 266200, P. R. China
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Xu Q, Berardan D, Brisset F, Colbeau-Justin C, Ghazzal MN. Engineering Directional Charge Carrier Transport Using Ferroelectric Polarization for Enhanced Photoelectrochemical Water Oxidation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2308750. [PMID: 38200680 DOI: 10.1002/smll.202308750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 12/11/2023] [Indexed: 01/12/2024]
Abstract
Introducing ferroelectric polarization has shown great potential to facilitate interfacial charge separation in photoelectrochemical (PEC) water splitting. However, unambiguous evidence of the actual influence of spontaneous ferroelectric polarization, as compared to heterojunction formation, on electron extraction and PEC water splitting is still lacking to date. Herein, core-shell BaTiO3/TiO2 nanostructures are designed as photoanodes based on paraelectric cubic and ferroelectric tetragonal phases BaTiO3 (BTO) perovskite. The cubic and tetragonal crystalline phases are stabilized using selected elaboration methods. Compared to the paraelectric cubic (c-BTO), the ferroelectric tetragonal (t-BTO) leads to a favorable ferroelectric polarization, enhancing directional charge separation and as a consequence to increased photocurrent up to a factor of 1.95. More interestingly, the charge separation efficiency can be tuned by applying positive or negative polarization, with the highest charge separation obtained for the positive one. When loading Ni(OH)2 as a cocatalyst on the t-BTO@TiO2 photoanode, the Ni(OH)2/TiO2/t-BTO exhibits a high performance and superior stability toward PEC water oxidation with a photocurrent almost 6.7 times that of the reference SiO2@TiO2. The proposed facilitation may open an avenue to engineer charge separation and transport for high-performance PEC water oxidation.
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Affiliation(s)
- Qian Xu
- Institut de Chimie Physique, Université Paris-Saclay, UMR 8000 CNRS, Orsay, 91405, France
| | - David Berardan
- Institut de Chimie Moléculaire et des Matériaux d'Orsay(ICMMO), Université Paris-Saclay, UMR 8182 CNRS, Orsay, 91405, France
| | - François Brisset
- Institut de Chimie Moléculaire et des Matériaux d'Orsay(ICMMO), Université Paris-Saclay, UMR 8182 CNRS, Orsay, 91405, France
| | | | - Mohamed Nawfal Ghazzal
- Institut de Chimie Physique, Université Paris-Saclay, UMR 8000 CNRS, Orsay, 91405, France
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5
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Kundu A, Dhillon AK, Singh R, Barman S, Siddhanta S, Chakraborty B. Evolution of Mn-Bi 2O 3 from the Mn-doped Bi 3O 4Br electro(pre)catalyst during the oxygen evolution reaction. Dalton Trans 2024; 53:8020-8032. [PMID: 38651992 DOI: 10.1039/d4dt00633j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Mn-doped Bi3O4Br has been synthesized using a solvothermal route. The undoped Bi3O4Br and Mn-Bi3O4Br materials possess orthorhombic unit cells with two distinct Bi sites forming a layered atomic arrangement. The shift in the (020) plane in the powder X-ray diffraction (PXRD) pattern confirms Mn-doping in the Bi3O4Br lattice. Elemental mapping indicated 7% Mn doping in the Bi3O4Br lattice structure. A core-level X-ray photoelectron study (XPS) indicates the presence of BiIII and MnII valence-states in Mn-Bi3O4Br. Doping with a cation (MnII) containing a different charge and ionic radius resulted in vacancy/defects in Mn-Bi3O4Br which further altered its electronic structure by reducing the indirect band gap, beneficial for electron conduction and electrocatalysis. The irreversible MnII to MnIII transformation at a potential of 1.48 V (vs. RHE) precedes the electrochemical oxygen evolution reaction (OER). The Mn-doped electrocatalyst achieved 10 mA cm-2 current density at 337 mV overpotential, while the pristine Bi3O4Br required 385 mV overpotential to reach the same activity. The pronounced OER activity of the Mn-Bi3O4Br sample over the pristine Bi3O4Br highlights the necessity of MnII doping. The superior activity of the Mn-Bi3O4Br catalyst over that of Bi3O4Br is due to a low Tafel slope, better double-layer capacitance (Cdl), and small charge-transfer resistance (Rct). The chronoamperometry (CA) study depicts long-term stability for 12 h at 20 mA cm-2. An electrolyzer fabricated as Pt(-)/(+)Mn-Bi3O4Br can deliver 10 mA cm-2 at a cell potential of 2.05 V. The post-CA-OER analyses of the anode confirmed the leaching of [Br-] followed by in situ formation of Mn-doped Bi2O3 as the electrocatalytically active species. Herein, an ultra-low Mn-doping into Bi3O4Br leads to an improvement in the electrocatalytic performance of the inactive Bi3O4Br material.
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Affiliation(s)
- Avinava Kundu
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
| | - Ashish Kumar Dhillon
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
| | - Ruchi Singh
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
| | - Sanmitra Barman
- Center for Advanced Materials and Devices (CAMD), BML Munjal University, Haryana, India.
| | - Soumik Siddhanta
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
| | - Biswarup Chakraborty
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India.
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6
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Geronimo L, Ferreira CG, Gacha V, Raptis D, Martorell J, Ros C. Understanding the Internal Conversion Efficiency of BiVO 4/SnO 2 Photoanodes for Solar Water Splitting: An Experimental and Computational Analysis. ACS APPLIED ENERGY MATERIALS 2024; 7:1792-1801. [PMID: 38487269 PMCID: PMC10934258 DOI: 10.1021/acsaem.3c02775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 12/22/2023] [Accepted: 02/06/2024] [Indexed: 03/17/2024]
Abstract
This work aims to understand the spin-coating growth process of BiVO4 photoanodes from a photon absorption and conversion perspective. BiVO4 layers with thicknesses ranging from 7 to 48 nm and the role of a thin (<5 nm) SnO2 hole-blocking layer have been studied. The internal absorbed photon-to-current efficiency (APCE) is found to be nonconstant, following a specific dependence of the internal charge separation and extraction on the increasing thickness. This APCE variation with BiVO4 thickness is key for precise computational simulation of light propagation in BiVO4 based on the transfer matrix method. Results are used for accurate incident photon-to-current efficiency (IPCE) prediction and will help in computational modeling of BiVO4 and other metal oxide photoanodes. This establishes a method to obtain the sample's thickness by knowing its IPCE, accounting for the change in the internal APCE conversion. Moreover, an improvement in fill factor and photogenerated voltage is attributed to the intermediate SnO2 hole-blocking layer, which was shown to have a negligible optical effect but to enhance charge separation and extraction for the lower energetic wavelengths. A Mott-Schottky analysis was used to confirm a photovoltage shift of 90 mV of the flat-band potential.
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Affiliation(s)
- Laura Geronimo
- ICFO
- Institut de Ciencies Fotoniques, The Barcelona
Institute of Science and Technology, 08860 Castelldefels, Spain
| | - Catarina G. Ferreira
- ICFO
- Institut de Ciencies Fotoniques, The Barcelona
Institute of Science and Technology, 08860 Castelldefels, Spain
| | - Valentina Gacha
- ICFO
- Institut de Ciencies Fotoniques, The Barcelona
Institute of Science and Technology, 08860 Castelldefels, Spain
| | - Dimitrios Raptis
- ICFO
- Institut de Ciencies Fotoniques, The Barcelona
Institute of Science and Technology, 08860 Castelldefels, Spain
| | - Jordi Martorell
- ICFO
- Institut de Ciencies Fotoniques, The Barcelona
Institute of Science and Technology, 08860 Castelldefels, Spain
- Departament
de Física, Universitat Politècnica
de Catalunya, 08222 Terrassa, Spain
| | - Carles Ros
- ICFO
- Institut de Ciencies Fotoniques, The Barcelona
Institute of Science and Technology, 08860 Castelldefels, Spain
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7
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Yuan C, Yin H, Lv H, Zhang Y, Li J, Xiao D, Yang X, Zhang Y, Zhang P. Defect and Donor Manipulated Highly Efficient Electron-Hole Separation in a 3D Nanoporous Schottky Heterojunction. JACS AU 2023; 3:3127-3140. [PMID: 38034977 PMCID: PMC10685433 DOI: 10.1021/jacsau.3c00482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 09/29/2023] [Accepted: 10/03/2023] [Indexed: 12/02/2023]
Abstract
Given the rapid recombination of photogenerated charge carriers and photocorrosion, transition metal sulfide photocatalysts usually suffer from modest photocatalytic performance. Herein, S-vacancy-rich ZnIn2S4 (VS-ZIS) nanosheets are integrated on 3D bicontinuous nitrogen-doped nanoporous graphene (N-npG), forming 3D heterostructures with well-fitted geometric configuration (VS-ZIS/N-npG) for highly efficient photocatalytic hydrogen production. The VS-ZIS/N-npG presents ultrafast interfacial photogenerated electrons captured by the S vacancies in VS-ZIS and holes neutralization behaviors by the extra free electrons in N-npG during photocatalysis, which are demonstrated by in situ XPS, femtosecond transient absorption (fs-TA) spectroscopy, and transient-state surface photovoltage (TS-SPV) spectra. The simulated interfacial charge rearrangement behaviors from DFT calculations also verify the separation tendency of photogenerated charge carriers. Thus, the optimized VS-ZIS/N-npG 3D hierarchical heterojunction with 1.0 wt % N-npG exhibits a comparably high hydrogen generation rate of 4222.4 μmol g-1 h-1, which is 5.6-fold higher than the bare VS-ZIS and 12.7-fold higher than the ZIS without S vacancies. This work sheds light on the rational design of photogenerated carrier transfer paths to facilitate charge separation and provides further hints for the design of hierarchical heterostructure photocatalysts.
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Affiliation(s)
- Chunyu Yuan
- School
of Physics and Physical Engineering, Qufu
Normal University, Qufu 273165, China
| | - Hongfei Yin
- School
of Physics and Physical Engineering, Qufu
Normal University, Qufu 273165, China
| | - Huijun Lv
- School
of Physics and Physical Engineering, Qufu
Normal University, Qufu 273165, China
| | - Yujin Zhang
- School
of Physics and Physical Engineering, Qufu
Normal University, Qufu 273165, China
| | - Jing Li
- Key
Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese
Academy of Sciences, Beijing 100190, China
| | - Dongdong Xiao
- Institute
of Physics, Chinese Academy of Sciences, Beijing 100190, China
| | - Xiaoyong Yang
- School
of Physics and Physical Engineering, Qufu
Normal University, Qufu 273165, China
- Condensed
Matter Theory Group, Materials Theory Division, Department of Physics
and Astronomy, Uppsala University, Box 516, 75120 Uppsala, Sweden
| | - Yongzheng Zhang
- School
of Physics and Physical Engineering, Qufu
Normal University, Qufu 273165, China
| | - Ping Zhang
- School
of Physics and Physical Engineering, Qufu
Normal University, Qufu 273165, China
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8
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Koshevoy E, Gribov E, Polskikh D, Lyulyukin M, Solovyeva M, Cherepanova S, Kozlov D, Selishchev D. Photoelectrochemical Methods for the Determination of the Flat-Band Potential in Semiconducting Photocatalysts: A Comparison Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:13466-13480. [PMID: 37696112 DOI: 10.1021/acs.langmuir.3c01158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Abstract
In addition to the band gap of a semiconducting photocatalyst, its band edges are important because they play a crucial role in the analysis of charge transfer and possible pathways of the photocatalytic reaction. The Mott-Schottky method using electrochemical impedance spectroscopy is the most common experimental technique for the determination of the electron potential in photocatalysts. This method is well suited for large crystals, but in the case of nanocatalysts, when the thickness of the charged layer is comparable with the size of the nanocrystals, the capacitance of the Helmholtz layer can substantially affect the measured potential. A contact between the electrolyte and the substrate, used for deposition of the photocatalyst, also affects the impedance. Application of other photoelectrochemical methods may help to avoid concerns in the interpretation of impedance data and improve the reliability of measurements. In this study, we have successfully prepared five visible-light active photocatalysts (i.e., N-doped TiO2, WO3, Bi2WO6, CoO, and g-C3N4) and measured their flat-band potentials using four (photo)electrochemical methods. The potentials are compared for all methods and discussed regarding the type of semiconducting material and its properties. The effect of methanol as a sacrificial agent for the enhanced transfer of charge carriers is studied and discussed for each method.
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Affiliation(s)
- Evgeny Koshevoy
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090, Russia
| | - Evgeny Gribov
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090, Russia
| | - Danil Polskikh
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090, Russia
| | - Mikhail Lyulyukin
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090, Russia
| | - Maria Solovyeva
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090, Russia
| | | | - Denis Kozlov
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090, Russia
| | - Dmitry Selishchev
- Boreskov Institute of Catalysis, Lavrentieva 5, Novosibirsk 630090, Russia
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Chang Y, Han M, Ding Y, Wei H, Zhang D, Luo H, Li X, Yan X. Interface Engineering of CoFe-LDH Modified Ti: α-Fe 2O 3 Photoanode for Enhanced Photoelectrochemical Water Oxidation. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2579. [PMID: 37764609 PMCID: PMC10536217 DOI: 10.3390/nano13182579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Revised: 09/14/2023] [Accepted: 09/15/2023] [Indexed: 09/29/2023]
Abstract
Effectively regulating and promoting the charge separation and transfer of photoanodes is a key and challenging aspect of photoelectrochemical (PEC) water oxidation. Herein, a Ti-doped hematite photoanode with a CoFe-LDH cocatalyst loaded on the surface was prepared through a series of processes, including hydrothermal treatment, annealing and electrodeposition. The prepared CoFe-LDH/Ti:α-Fe2O3 photoanode exhibited an outstanding photocurrent density of 3.06 mA/cm2 at 1.23 VRHE, which is five times higher than that of α-Fe2O3 alone. CoFe-LDH modification and Ti doping on hematite can boost the surface charge transfer efficiency, which is mainly attributed to the interface interaction between CoFe-LDH and Ti:α-Fe2O3. Furthermore, we investigated the role of Ti doping in enhancing the PEC performance of CoFe-LDH/Ti:α-Fe2O3. A series of characterizations and theoretical calculations revealed that, in addition to improving the electronic conductivity of the bulk material, Ti doping also further enhances the interface coupling of CoFe-LDH/α-Fe2O3 and finely regulates the interfacial electronic structure. These changes promote the rapid extraction of holes from hematite and facilitate charge separation and transfer. The informative findings presented in this work provide valuable insights for the design and construction of hematite photoanodes, offering guidance for achieving excellent performance in photoelectrochemical (PEC) water oxidation.
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Affiliation(s)
- Yue Chang
- Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
- National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China
- BRI Southeast Asia Network for Corrosion and Protection (MOE), Shunde Innovation School, University of Science and Technology Beijing, Foshan 528399, China
| | - Minmin Han
- National Engineering Research Center for Intelligent Electrical Vehicle Power System, College of Mechanical and Electrical Engineering, Qingdao University, Qingdao 266071, China
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Ibaraki, Japan
| | - Yehui Ding
- Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
| | - Huiyun Wei
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
| | - Dawei Zhang
- Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
- National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China
- BRI Southeast Asia Network for Corrosion and Protection (MOE), Shunde Innovation School, University of Science and Technology Beijing, Foshan 528399, China
| | - Hong Luo
- Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
- National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China
| | - Xiaogang Li
- Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
- National Materials Corrosion and Protection Data Center, University of Science and Technology Beijing, Beijing 100083, China
| | - Xiongbo Yan
- Beijing Advanced Innovation Center Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
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10
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Yang P, Shi H, Wu H, Yu D, Huang L, Wu Y, Gong X, Xiao P, Zhang Y. Manipulating the surface states of BiVO 4 through electrochemical reduction for enhanced PEC water oxidation. NANOSCALE 2023; 15:4536-4545. [PMID: 36757266 DOI: 10.1039/d2nr07138j] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Bismuth vanadate (BiVO4) is a prospective candidate for photoelectrochemical (PEC) water oxidation, but its commercial application is limited due to the serious surface charge recombination. In this work, we propose a novel and effective electrochemical reduction strategy combined with co-catalyst modification to manipulate the surface states of the BiVO4 photoanode. Specifically, an ultrathin amorphous structure is formed on the surface of BiVO4 after electrochemical reduction ascribed to the breaking of the surface metal-O bonds. Photoelectrochemical measurements and first-principles calculation show that the electrochemical reduction treatment can effectively reduce the surface energy, thereby passivating the recombined surface states (r-ss) and increasing the mobility of photogenerated holes. In addition, the FeOOH co-catalyst layer further increases the intermediate surface states (i-ss) of BiVO4, stabilizes the surface structure and enhances its PEC performance. Benefiting from the superior charge transfer efficiency and the excellent water oxidation kinetics, the -0.8/BVO/Fe photoanode achieves 2.02 mA cm-2 photocurrent at 1.23 VRHE (2.4 times that of the original BiVO4); meanwhile, the onset potential shifts 90 mV to the cathode. These results provide a new surface engineering tactic to modify the surface states of semiconductor photoanodes for high-efficiency PEC water oxidation.
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Affiliation(s)
- Peixin Yang
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 401331, China.
| | - Huihui Shi
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
| | - Hangfei Wu
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 401331, China.
| | - Duohuan Yu
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 401331, China.
| | - Lu Huang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
| | - Yali Wu
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
| | - Xiangnan Gong
- Analytical and Testing Center, Chongqing University, Chongqing, 401331, China
| | - Peng Xiao
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 401331, China.
| | - Yunhuai Zhang
- College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China.
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Bisquert J. Interpretation of the Recombination Lifetime in Halide Perovskite Devices by Correlated Techniques. J Phys Chem Lett 2022; 13:7320-7335. [PMID: 35920697 PMCID: PMC9972473 DOI: 10.1021/acs.jpclett.2c01776] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 07/28/2022] [Indexed: 06/15/2023]
Abstract
The recombination lifetime is a central quantity of optoelectronic devices, as it controls properties such as the open-circuit voltage and light emission rates. Recently, the lifetime properties of halide perovskite devices have been measured over a wide range of the photovoltage, using techniques associated with a steady state by small perturbation methods. It has been remarked that observation of the lifetime is affected by different additional properties of the device, such as multiple trapping effects and capacitive charging. We discuss the meaning of delay factors in the observations of recombination lifetime in halide perovskites. We formulate a general equivalent circuit model that is a basis for the interpretation of all the small perturbation techniques. We discuss the connection of the recombination model to the previous reports of impedance spectroscopy of halide perovskites. Finally, we comment on the correlation properties of the different light-modulated techniques.
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