Journal of Physical Chemistry C
·
2015
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IF 4.772
Yuangang Li,Rongrong Wang,Huajing Li,Xiaoliang Wei,Juan Feng,Kaiqiang Liu,Yongqiang Dang,Anning Zhou
Co-Pi decorated TiO2@graphitic carbon nitrides (g-C3N4) nanorod arrays (denoted as CCNRs) with different mass ratios of g-C3N4 have been constructed on the FTO substrate through three processes, hydrothermal growth, chemical bath deposition and electrodeposition. First, TiO2 nanorod arrays were grown onto a FTO substrate by a hydrothermal method. Second, g-C3N4 was coated onto the TiO2 nanorod arrays by immersing the above substrate with TiO2 nanorod arrays into a solution of urea and then heated at higher temperature. In this procedure, the amount of the g-C3N4 on the TiO2 nanorod arrays can be controlled by tuning the concentration of the urea solution. At last, Co-Pi were decorated on the surface of the TiO2@g-C3N4 by electrodeposition. The as-prepared CCNRs were characterized by XRD, FESEM, TEM, XPS, UV–vis, and FTIR, respectively, which illustrated that Co-Pi moieties were successfully decorated on the hybrid TiO2@g-C3N4 nanorod arrays. Photoelectrochemical (PEC) measurements have demonstrated that the prepared CCNRs serve as an efficient and stable photoanode for PEC seawater splitting. The photocurrent density reaches 1.6 mA/cm2 under 100 mW/cm2 (AM1.5G) light illumination at 1.23 V (RHE). More significantly, the CCNRs photoanode is quite stable during seawater splitting and the performance remain undiminished even after 10 h continuous illumination. Finally, a systematical photocatalytic mechanism of the Co-Pi decorated TiO2@g-C3N4 was proposed, and it can be considered as potential explanation of enhanced PEC performance.
研究领域:
材料科学
·
化学
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高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 11
·6327-6336
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IF 10.733
Jingchao Liu,Jianming Li,Mingfei Shao,Min Wei
To achieve highly efficient photoelectrochemical (PEC) water splitting, great efforts have been dedicated to develop various photoelectrode materials in pure water electrolytes. Recently, some studies are turning to hydrogen production from seawater or wastewater, to save valuable freshwater resources and make waste profitable. Here, we fabricate one-dimensional SnO2@BiVO4 core–shell nanorod arrays decorated with cobalt-phosphate cocatalyst (1D SnO2@BiVO4/Co-Pi NRAs), which show efficient charge separation and transport properties due to the rational design of conducting core-layer and introduction of the cocatalyst. The as-obtained SnO2@BiVO4/Co-Pi photoanodes exhibit largely enhanced PEC water oxidation performance: the maximum photocurrent density of 2.63 mA cm−2 at 1.23 V vs. RHE is 6.58 times higher than that of pristine BiVO4 films (∼0.40 mA cm−2). Moreover, the ternary photoanode exhibits promising PEC performance for urea oxidation, giving rise to a current density of 3.44 mA cm−2 at 1.23 V vs. RHE in a neutral urea electrolyte. This work presents a sunlight-driven, eco-friendly and sustainable method to produce hydrogen and simultaneously treat urea-rich wastewater.
研究领域:
材料科学
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能源与环境科学
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光催化
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2021
·
IF 3.995
Jun Liu,Meng Sun,Meng-Jie Chang,Wen-Na Cui,Cong-Miao Zhang,Fu-Rong Ni,Jing Zhang,Si-Meng Fan,Hui-Ling Du
s We present a simple methodology to construct novel Co-Pi decorated TiO 2 /Bi 4 Ti 3 O 12 nanorod (TiO 2 /BTO@Co-Pi NR) arrays as photoanode for enhanced water splitting. By using successive ionic layer adsorption and reaction (SILAR) method, controllable amounts of BiOI nanoplates were uniformly immobilized on the hydrothermal grown TiO 2 NR arrays on Fluorine-doped tin oxide (FTO) substrate. TiO 2 /BTO NR heterojunction was conveniently obtained by partial conversion of TiO 2 to high crystallized Bi 4 Ti 3 O 12 through a solid-state reaction with BiOI nanoplates at high temperature. Afterwards, Co-Pi nanoparticles were deposited on TiO 2 /BTO by photoelectrical deposition to generate TiO 2 /BTO@Co-Pi composites. Photoelectrochemical (PEC) measurements have demonstrated that the prepared TiO 2 /BTO photoanode exhibits extremely enhanced performance than pristine TiO 2 for PEC water splitting thanks to the increased visible light absorption and photogenerated charge separation efficiency. Moreover, both the photocurrent density and incident photo-to-current conversion efficiency (IPCE) were further improved after the decoration of Co-Pi. This work provides a feasible and low-cost strategy to establish TiO 2 /Bi 4 Ti 3 O 12 based photoelectrode, therefore, is suitable for practical applications.
研究领域:
材料科学
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光电化学
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纳米技术
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太阳能转换
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Yue Sun,Simeng Shao,Yanfeng Wang,Wenjuan Lu,Pingping Zhang,Qingqiang Yao
For the first time, g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi heterojunctional hollow spheres were successfully fabricated via thermal condensation method followed by solvothermal and photo-deposition treatment, which showed excellent photocatalytical property. Except for the Z-scheme charge transfer between α-Fe 2 O 3 and g-C 3 N 4 , the Co-Pi could further reduce the combination of photogenerated electrons and holes as a hole storage agent, resulting in remarkably enhanced visible-light photocatalytic water splitting activity with the H 2 production rate of 450 μmol h −1 g −1 , which is 15.7 times higher than that of g-C 3 N 4 . Moreover, the photocatalytic activity of the prepared ternary hollow photocatalysts showed almost no significant weakness after five cycles, which indicated their good performance stability. The as-prepared g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi also possessed good activity for overall water splitting with the hydrogen production rate reaching 9.8 μmol h −1 g −1 . This synthesized g-C 3 N 4 @α-Fe 2 O 3 /Co-Pi composite is expected to be a promising candidate for water splitting.
研究领域:
材料科学
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光催化
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能源材料
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纳米技术
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DOI
高影响因子
ELECTROCHIMICA ACTA
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2016
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IF 4.803
Yang Zhang,Dan Wang,Xintong Zhang,Ying Chen,Lina Kong,Peng Chen,Yinglin Wang,Changhua Wang,Lingling Wang,Yichun Liu
Improving charge transportation and interfacial charge transfer in semiconductor photoelectrodes are two critical issues for achieving high-efficiency photoelectrochemical (PEC) water splitting. Herein, a combined hydrogenation treatment and cobalt-phosphate (Co-Pi) deposition is reported to dramatically enhance the PEC performance of nanoporous BiVO 4 photoanode. Linear sweep voltammograms show that after the combined treatment, photocurrent density of nanoporous BiVO 4 photoanode is increased for ca. 3 times at 1.23 V versus reversible hydrogen electrode (RHE), and the onset potential is negatively shifted from 0.53 V to 0.23 V versus RHE. Combined photoluminescence, Mott-Schottky, open circuit potential, as well as electrochemical impedance spectroscopy analyses reveal the synergistic effect of hydrogenation treatment and Co-Pi deposition on enhancing the PEC performance of nanoporous BiVO 4 photoanode, facilitating both charge transportation and interfacial charge transfer without aggravating charge recombination.
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
Nano Energy
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2017
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IF 12.343
Xiaolin Lv,Kaiqi Nie,Huiwen Lan,Xin Li,Youyong Li,Xuhui Sun,Jun Zhong,Shuit-Tong Lee
Hematite is a promising photocatalyst for solar water splitting while its performance has been severely limited by various factors. Recently surface Fe 2 TiO 5 layer was widely reported to enhance the performance of hematite with a favorable band position to facilitate hole transport. Here we further show that the Fe 2 TiO 5 -incorporation in bulk hematite can also improve the performance with faster charge separation. Moreover, it can be well coupled with surface P-modification to simultaneously improve charge separation and hole transfer with a synergetic effect. The Ti and P co-modified hematite shows a significantly enhanced photocurrent of 2.37 mA/cm 2 at 1.23 V vs. RHE when compared to the pristine value of 0.85 mA/cm 2 . After coupling with Co-Pi catalysts, the hematite sample can even achieve a stable, high photocurrent of 2.90 mA/cm 2 at 1.23 V vs. RHE. The design of Ti and P co-modified hematite hollow nanostructures can be used as a promising candidate for solar water splitting applications. The discrete Fe 2 TiO 5 -incorporation also provides a good insight on the mechanism to understand other Ti-based treatments of hematite.
研究领域:
材料科学
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光催化
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2026
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IF 5.2
Meng Yuan,Lingling Huang,Qi Zhang,Mingquan Huang,Baocai Xu,Liangyun Yu
Novel S-scheme heterojunction boosts light absorption/charge separation. • In-situ Co-Pi co-catalyst reduced electron-hole recombination. • Polypyrrole-MIP membrane ensures DIM recognition with maintained conductivity. • The sensor achieves ultra-sensitivity: LOD 0.83 fmol/L, 1.0 fmol/L-100 pmol/L range. • The new sensors demonstrated reliable DIM detection in real samples. An S-scheme TpPzda-COF@ZnIn 2 S 4 @Co-Pi core–shell hybrid was fabricated via in situ growth of a ZnIn₂S₄ nanoflower shell on a β-ketoenamine-linked TpPzda-COF core, followed by photodeposition of a cobalt-phosphate (Co-Pi) cocatalyst. The resulting hierarchical architecture facilitated efficient interfacial charge transfer and synergistic effects, leading to enhanced light absorption, charge separation, and catalytic activity. Based on this photoactive material, a molecularly imprinted photoelectrochemical (MIP-PEC) sensor was constructed through electropolymerization using pyrrole as the functional monomer and dimethoate (DIM) as the template. The imprinted cavities enabled selective recognition of DIM, regulating interfacial electron transfer and producing distinct photocurrent responses. Benefiting from the π-conjugated structure of TpPzda-COF, the visible-light activity of ZnIn 2 S 4 , and the hole-extraction capability of Co-Pi, the proposed sensor exhibited high sensitivity, good stability, and satisfactory reproducibility. An ultralow detection limit of 0.83 fmol·L −1 was achieved over a wide linear range of 1.0 fmol·L −1 to 100 pmol·L −1 . Furthermore, successful determination of DIM in real fruit and vegetable samples demonstrated the applicability of the sensor for food safety and environmental monitoring. Download: Download high-res image (95KB) Download: Download full-size image
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高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 23
·5687-5693
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IF 5.773
Weijia Lv,Zhihang Liu,Jinjing Lan,Ziyu Liu,Wenxin Mi,Juying Lei,Lingzhi Wang,Yongdi Liu,Jinlong Zhang
Spurred by the threat of hexavalent chromium (Cr(VI)), the idea of reducing Cr(VI) into less toxic Cr(III) has been commonly studied. Here, we used a facile photodeposition method to modify inverse opal TiO2 (i.o.TiO2) with cobalt phosphate (Co-Pi), and the resulting composite was applied for photocatalytic reduction of Cr(VI). This is the first time that an inverse opal structure as well as a Co-Pi catalyst is applied in the photocatalytic reduction of Cr(VI). In addition, the combination of i.o.TiO2 and Co-Pi achieves high visible-light-driven photocatalytic activity, which is better than that of the pure Co-Pi catalyst and unmodified i.o.TiO2. Experimental results demonstrated that the Co-Pi in the composite could absorb a large amount of visible light and then inject electrons into the conduction band of i.o.TiO2 which subsequently participate in the reduction reaction of Cr(VI). Moreover, the inverse opal structure of the catalyst possesses the advantages of having a large surface area and efficient light harvesting ability, leading to the better catalytic activity of Co-Pi/i.o.TiO2 than Co-Pi/bulk TiO2 and Co-Pi/P25. It's also proved that this Co-Pi/i.o.TiO2 photocatalyst can efficiently remove organic pollutants together with Cr(VI). This study provides new insights into the design and fabrication of efficient photocatalysts for the removal of environmental pollutants under visible light.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
POLYMER SCIENCE SERIES A
·
2023
·Vol. 64
·期 6
·653-661
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IF 1
Jiang Taijun,Peng Jun,Wang Jin,Yang Jun,Zeng Guangsheng
Abstract The aim was to prepare copolyimide (BPDA/PMDA-PDA) films of low thermal expansion coefficient by incorporating 1,2,4,5-benzenetetracarboxylic anhydride (PMDA) into polymer backbones 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA)/ p -phenylenediamine (PDA). FTIR and WAXD were used to explore the chemical and physical microstructure of the PIs films. DMA, TMA and TGA were used to characterize the mechanical and thermal performance of the PIs film respectively. The results show that the smectic structure of the film was destroyed by introducing rigid PMDA groups. The free volume fraction of polymers reached its maximum value when 40 wt % PMDA was added. The glass transition temperature of the polymers increased from 330 to 430°C and the thermal decomposition temperature declined slightly with the addition of PMDA. The inflection point in thermal expansion coefficient (CTE) of the BPDA-PDA polymers in TMA test reached as high as 470°C. The glass transition temperature of the polymers increased but the service temperature range narrowed with the addition of PMDA. The optimized PMDA concentration to obtain a best CTE was 5% as was revealed by the experimental results. The insights obtained from the experiments indicated that excessive introduction of PMDA into the polymers could increase the glass transition temperature significantly. However, the operating temperature range may be reduced. This research could offer practical and valuable references to the application for co-PI films.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Xue Li,Jinquan Wan,Yongwen Ma,Yan Wang,Xitong Li
The serious recombination of photogenerated carriers and the photochemical corrosion of the electrode extremely restricted its photoelectrochemical (PEC) performance, which could not reach the theoretical photocurrent intensity. However, so far, there are few comprehensive reports on the mechanism of corrosion inhibition and stability improvement of electrodes in photocatalytic degradation. In this paper, BiVO 4 /Cu 2 O heterojunction modified by Cobalt-phosphate (Co-Pi) co-catalyst was successfully prepared to address the aforementioned issues. Co-Pi completed the holes capture and release process through the change of its own chemical state (Co 2+/3+ →Co 4+ →Co 2+/3+ ), and also affected the energy band bending of the BiVO 4 /Cu 2 O heterojunction. In addition, the effect mechanism of the Co-Pi film thickness on the PEC performance of the photoanode was systematically discussed in this report. When the deposition amount was 0.05C∙cm −2 , the photocurrent density reached 2.22 mA∙cm −2 at 1.23 V (vs. RHE), which was 2.8 times that of bare BiVO 4 . The LSV curves, EIS and UV–vis absorption spectra reveal the enhanced PEC performance and light stability of the prepared electrode materials. When it is applied to photocatalytic degradation of organic pollutants, BiVO 4 /Cu 2 O/0.05Co-Pi shows high activity and potential for MB and CIP degradation, and is expected to be stably applied to the field of photocatalytic degradation of refractory organic pollutants in water.
研究领域:
材料科学
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环境科学
·
电化学
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高影响因子
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