Materials Today Communications
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2024
·
IF 3.7
Zemin Zhou,Ming Li,Yu Hu,Zhipeng Chen
Employing a photoanode with energy self-storage capability is crucial to provide continuous photocathodic protection (PCP) for metal under intermittent irradiation. In this work, NiO, a hole collector, was coupled with WO 3 /BiVO 4 to improve photoelectrochemical properties and photocathodic protection ability for stainless steel (316 SS). The optimal WO 3 /BiVO 4 /NiO photoanode (WB2N2) exhibited 35.1% and 26.6% increase in energy storage capacity compared with WO 3 and WO 3 /BiVO 4 under illumination, respectively. The open-circuit potential (OCP) of 316SS coupled with irradiated WB2N2 was reduced from −143 mV (uncoupled OCP) to −726 mV, and the electrode potential can maintain at −540 mV after light was turned off. It was calculated that electrons of about 1.286×10 −2 C was transferred from WB2N2 to 316 SS after 50 s illumination, which was 11.7 and 5.1 times of that WO 3 and WB2 passed to 316SS, respectively, confirming the best persistent PCP performance of WB2N2 in the absence of light. The positive role of NiO on the PCP and persistent PCP performance was analyzed. The long-term OCP test and XRD analysis proved the stability of WO 3 /BiVO 4 /NiO in PCP performance and chemical composition .
研究领域:
材料科学
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电化学
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腐蚀科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Jing Zhou,Jiangchun Chen,Jinlong Zheng,Bingyi Yan,Yan Zhou,Bingdong Hou,Buyang Chen
Carbon quantum dots (CQDs) were synthesized by a facile and green pyrolysis method. The as-prepared CQDs show wide light absorption , tunable downconversion photoluminescence (PL) properties and excellent “upconversion” luminescence properties. CQDs were used to design the TiO 2 /CdS/C photoelectrodes for photoelectrochemical hydrogen evolution . The role of the CQDs was investigated based on the TiO 2 /CdS/C photoelectrodes. The results reveal that CQDs can enhance light-harvesting efficiency and improve their charge separation and transfer properties when coupled with conventional QD-sensitized photoelectrodes. Nevertheless, the contribution of “upconversion” luminescence of CQDs to the enhanced photoelectrochemical performance is negligible.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 32
·1902101
·
IF 15.621
Yaping Zhang,Yang Li,Diqing Ni,Zhiwei Chen,Xiao Wang,Yuyu Bu,Jin-Ping Ao
In this work, a water splitting photoanode composed of a BiVO 4 thin film surface modified by the deposition of a rhodium (Rh)-doped SrTiO 3 perovskite is fabricated, and the Rh-doped SrTiO 3 outer layer exhibits special photoelectrochemical (PEC) oxygen evolution co-catalytic activity. Controlled intensity modulated photo-current spectroscopy, electrochemical impedance spectroscopy, and other electrochemical results indicate that the Rh on the perovskite provide an oxidation active site during the PEC water oxidation process by reducing the reaction energy barrier for water oxidation. Theoretical calculations indicate that the water oxidation reaction is more likely to occur on the (110) crystal plane of Rh-SrTiO 3 because the oxygen evolution reaction overpotential on the (110) crystal plane is reduced significantly. Therefore, the obtained BiVO 4 /Rh5%-SrTiO 3 photoanode exhibits an optimized PEC performance. In particular, it facilitates the saturation of the photocurrent density. Thus, the presence of doped Rh in SrTiO 3 can reduce the amount of noble metals required while achieving excellent and stable oxygen evolution properties.
研究领域:
材料科学
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电化学
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能源转换
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产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 4
·379
·
IF 3.444
Guannan He,Yimin Zhang,Qinyu He
High-rate recombination of photogenerated electron and hole pairs will lead to low photocatalytic activity. Constructing heterostructure is a way to address this problem and thus increase the photoelectrochemical performance of the photocatalysts. In this article, molybdenum sulfide (MoS2)/cadmium sulfide (CdS) nanocomposites were fabricated by a facile solvothermal method after sonication. The CdS nanoparticles immobilized on the MoS2sheet retained the original crystal structure and morphology. The composites exhibit higher photoelectrochemical properties compared with pure MoS2nanosheets or CdS powder. When the precursor concentration of CdS is 0.015 M, the MoS2/CdS composites yield the highest photocurrent, which is enhanced nearly five times compared with pure CdS or MoS2. The improved photoelectrochemical performance can be ascribed to the increase of light harvest, as well as to the heterostructure that decreases the recombination rate of the photogenerated electron and hole pairs.Keywords:MoS2nanosheets;CdS nanoparticle;heterostructure;photocatalysis;photoelectrochemical properties
研究领域:
材料科学
·
光化学
·
纳米技术
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产品关联
DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 4
·400
·
IF 4.501
Sujuan Hu,Li Jin,Wangyu Si,Baoling Wang,Mingshan Zhu
Vacancies engineering based on semiconductors is an effective method to enhance photoelectrochemical activity. Herein, we used a facile one-step solvothermal method to prepare sulfur vacancies modified ultrathin two-dimensional (2D) ZnIn2S4nanosheets. The photon-to-current efficiency of sulfur vacancies modified ultrathin 2D ZnIn2S4nanosheets is 1.82-fold than ZnIn2S4nanosheets without sulfur vacancies and 2.04-fold than multilayer ZnIn2S4. The better performances can be attributed to the introduced sulfur vacancies in ZnIn2S4, which influence the electronic structure of ZnIn2S4to absorb more visible light and act as the electrons trapping sites to suppress the recombination of photo-generated carriers. These results provide a new route to designing efficient photocatalyst by introducing sulfur vacancies.Keywords:ZnIn2S4nanosheets;sulfur vacancies;vacancies engineering;photoelectrocatalysts;photoelectrochemical performance
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Small
·
2021
·Vol. 17
·期 38
·2102149
·
IF 13.281
Huaping Peng,Luyao Xu,Yilun Sheng,Weiming Sun,Yu Yang,Haohua Deng,Wei Chen,Juewen Liu
Design of high-performance all-inorganic halide perovskites, especially lead-free perovskites, is key to the broadening of its application prospects. Herein, the authors report the synthesis of ligand-free cesium platinum (IV) bromide nanocrystals (Cs 2 PtBr 6 NCs), a new kind of vacancy-ordered lead-free perovskite nanomaterial, by a facile one-pot method. The Cs 2 PtBr 6 NCs exhibits a narrow band gap of 1.32 eV covering the entire visible range, which is supported by density functional theory calculations. Together with their high conductivity, matching energy levels with the work function of carbon electrodes, and excellent environmental stability, this NC displays a cathodic photocurrent density as high as 335 µA cm -2 , two orders of magnitude higher than other perovskites in aqueous solutions without the need of other electron acceptors. These combined properties suggest that the Cs 2 PtBr 6 NCs have great potentials in a wide range of photoelectronic and photoelectrochemical sensing applications.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xingsheng Hu,Qizhao Wang,Yan Li,Yan Meng,Lei Wang,Houde She,Jingwei Huang
In this work, Molybdenum (Mo) doped bismuth vanadate (BiVO 4 ) is carried out by traditional calcination method, while carbon-based cobalt (Co-Ci) is prepared by photoelectric deposition (PED) and used as co-catalyst to decorate the surface, its photocurrent density reached 3.15 mA/cm 2 at 1.23 V vs RHE. More importantly, the H-Co-Ci/Mo: BiVO 4 photoanode obtained by plasma etching of Co-Ci/Mo: BiVO 4 has greatly improved surface hydrophilicity. The photocurrent density of H-Co-Ci/Mo: BiVO 4 photoanode is 4.8 times that of BiVO 4 photoanode, reaching 3.95 mA/cm 2 . In addition, the incident photon-current conversion efficiency (IPCE) value of the H-Co-Ci/Mo: BiVO 4 photoanode is as high as 60%, and both the injection and separation efficiency have also been enhanced. The enhanced photoelectrochemical (PEC) performance is attributed to the good wettability of the material surface and improvement of water oxidation kinetics. These findings provide a mild and efficient modification method for improving BiVO 4 used for water splitting, and are expected to provide new ideas for other photoanodes.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2023
·Vol. 16
·期 6
·3024-3033
·
IF 6.7
Ruowen Zhao,Yupu Zhang,Fangli Wu,Jianyuan Wang,Fang Chen,Wei Zhai
Integration of oxygen vacancies (Vo) into nanostructured semiconductor-based photocatalysts has been recognized as a promising strategy for enhancing the performance of photoelectrochemical (PEC) water splitting. However, precisely controlling the Vo concentration in photocatalysts via an effective and tunable approach remains challenging. Herein, a series of optimized bismuth tungstate (Bi2WO6) nanosheet-based photoanodes with varying concentrations of Vo were prepared by a sonochemical method with in situ cavitation detection, which enables accurate manipulation of the acoustic cavitation intensity applied to the surface of Bi2WO6 photoanodes in alkaline solution. Based on the analysis of the Vo concentration and sound field characteristics, the mechanism of sonochemical regulation of Vo in Bi2WO6 nanosheets was interpreted. Specifically, the increase in Vo concentration can be attributed to the enhancement of Bi–O bond dissociation. This enhancement is influenced not only by the intensified impact of shear force and the generation of active radicals by transient cavitation, but also by the accelerated diffusion of the reactant, a result of stable cavitation. By optimizing the transient and stable cavitation intensity, a Vo-rich Bi2WO6 photoanode was obtained without altering the microstructure of Bi2WO6 nanosheets. The presence of high concentration Vo facilitates the interfacial chemical reactivity and the transmission of photogenerated carriers, leading to the drastic promotion of the PEC water splitting performance. The transient photocurrent density of the Vo-rich Bi2WO6 photoanode reaches 69.2 μA cm−2 (1.23 V vs. RHE), 7.86 times that of the untreated Bi2WO6 photoanode. Additionally, the charge injection efficiency increases to 35.4%. This work provides a controllable and effective method for defect engineering of nanostructured semiconductor-based electrodes.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2021
·
IF 6.057
Chang Ping Yang,Qing Wu,Zhong Wei Jiang,Xue Wang,Cheng Zhi Huang,Yuan Fang Li
Defect engineering in the photoelectrochemical (PEC) process of photoelectrodes has been extensively studied. But insufficient attention has been received about the impact of metal vacancies (V M ) in PEC process. Herein, the influence of Cu vacancies (V Cu ) on PEC performance of copper oxide (CuO) derived from Cu-based metal-organic gel (Cu-MOG) precursor was reported. It can be found that the presence of more V Cu can improve the PEC activity of CuO photocathode by facilitating the charge separation and transfer. Moreover, the as-prepared CuO was presented as a new PEC sensor to detect l -cysteine (L-Cys) on the basis of the excellent PEC performance, which showed high sensitivity and selectivity. Good linear response of L-Cys within the range of 0.1–6 μM was performed with a detection limit of 0.04 μM. This work not only provides insights into the role of V M in the PEC process of photocathodes, but also proved the high potential applicability of CuO as a PEC device for biomolecule detection.
研究领域:
材料科学
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生物传感
·
缺陷工程
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DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 5
·959-967
·
IF 7.779
Chao Wang,Shoujuan Wang,Fangong Kong,Ning Chen
Sensitized Ti-oxo clusters have attracted growing attention as analogous molecular model compounds of dye-sensitized titanium dioxide solar cells. However, reports on the introduction of metal complexes as photosensitizers into Ti-oxo clusters are still very rare. Herein, with the use of an organometallic complex ferrocene as a sensitizer, two novel ferrocene-sensitized Ti-oxo clusters, namely, [Ti8(μ3-O)4(Dipa)2(Fcdc)4(OiPr)10]·2HOiPr (H2Fcdc = 1,1-ferrocene dicarboxylic acid, Dipa = diisopropanolamine, and HOiPr = isopropanol, Ti8Fcdc4) and [Ti10(μ4-O)2(μ3-O)4(Fcdc)2(μ2-OEt)8(OEt)10]·2HOEt (Ti10Fcdc2) have been successfully synthesized. Their molecular structures, light absorption, charge transfer, and photoelectrochemical properties were systematically investigated. It is demonstrated that the incorporation of Fcdc ligands shows a significant influence on the light absorption of the resulting clusters, and their absorption band edge is extended to about 580 nm. Furthermore, experimental measurements and theoretical calculations showed that the intense intramolecular charge transfer occurs from the Fcdc ligands to the Ti-oxo core. Based on these advantages, clusters Ti8Fcdc4 and Ti10Fcdc2 were used as photoelectrode precursors to carry out photoelectrochemical experiments, and both exhibited clear photocurrent responses. The molecular structure, light absorption, and effective charge transfer of materials have a direct bearing on their photoelectrochemical performances. This work not only provides novel structural models for sensitized Ti-oxo clusters towards the modulation of photoelectric properties but also provides new insights into further understanding the structure–property relationships of sensitized clusters.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2023
·
IF 3.6
Lianqing Yu,Yanxing Liu,Lijie Duan,Yaping Zhang,Liana Alvares Rodrigues,D. Amaranatha Reddy,Haifeng Zhu
Construction of heterojunctions has been shown to be one of the most promising methods for the preparation of highly efficient catalysts, because it is feasible and effective for the separation of electron-hole pairs, prolonging the lifetime of photogenerated electrons. In this study, TiO 2 was grown on fluorine-doped tin oxide glass (FTO), and then a strontium source was added to obtain heterojunctions between SrTiO 3 and TiO 2 using in-situ ion exchange hydrothermal method. The in-situ grown SrTiO 3 /TiO 2 (TST) composite has a better absorption performance, a narrower band gap, and a lower carrier recombination rate compared to the pure TiO 2 sample, which improves the photoelectrochemical performance. The photocurrent density of TST-10 (hydrothermally treated for 10 h) has the largest value of 0.06 mA·cm −2 , which is about three times higher than that of pure TiO 2 . Then, the first-principles density functional theory (DFT) calculation was used to further explore the photocatalytic mechanism of TST. The exchange correlation energy was based on the Generalised Gradient Approximation (GGA) with Perdew–Burke–Ernzerhof (PBE) functional calculation method to study the electronic and optical properties of SrTiO 3 /TiO 2 heterostructures. The results show that the carrier transfer rate and the optical absorption coefficient of the material increase significantly after the establishment of the in-situ heterojunction. This study offers insight into the heterostructures’ interface significance on photocatalytic activity.
研究领域:
材料科学
·
光催化
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Na Dai,Yingjie Zhang,Zhiwei Peng,Jikai Liu
An efficient CQDs/TiO 2 /Sn-Fe 2 O 3-x heterojunction photoanode was designed and fabricated to enhance the photoelectrochemical (PEC) performance of hematite for water oxidation. The key innovation of this work lies in the construction of an oxygen-vacancy-rich TiO 2 /Sn-Fe 2 O 3-x heterojunction photoanode by using Ti 3 C 2 MXene as the precursor of TiO 2 through a one-pot calcination process. The two main advantages of the present synthetic strategy are introducing abundant oxygen vacancies into the photoanode and preserving the nanostructure of the photoanode at high temperatures. During the synthesis, Ti 3 C 2 MXene was oxidized to form TiO 2 , while Sn-FeOOH was simultaneously converted into Sn-Fe 2 O 3-x nanorods. The high reducibility of Ti 3 C 2 MXene and the doping of Sn 4 + played a critical role in introducing abundant oxygen vacancies into Sn-Fe 2 O 3-x . The concurrent formation of TiO 2 and Sn-Fe 2 O 3-x effectively prevented the aggregation of α-Fe 2 O 3 nanorods at the high calcination temperature of 800°C and promoted close contact between the TiO 2 and Sn-Fe 2 O 3-x , reducing the interfacial transfer resistance. Lastly, the incorporation of CQDs further increased the light absorption ability and PEC performance of the heterojunction photoanode. The CQDs/TiO 2 /Sn-Fe 2 O 3-x photoanode achieved a photocurrent density of 1.47 mA/cm² at 1.23 V vs. RHE, which was 3.34 times higher than the α-Fe 2 O 3 . The enhanced PEC performance can be attributed to the introduction of abundant oxygen vacancies and the maintenance of its nanostructure at high temperatures, which can improve the donor density, charge transfer efficiency and light harvesting ability of the resultant photoanode.
研究领域:
材料科学
·
能源化学
·
纳米技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）