ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2018
·Vol. 25
·期 23
·22455-22463
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IF 2.8
Wang Pingping,Dong Faqin,Liu Mingxue,He Huichao,Huo Tingting,Zhou Lei,Zhang Wei
Photoelectrochemical process is an environmentally friendly technology and has a wide application in the control of environmental pollutants. Efficient nanophotocatalysts responsive to visible light are still highly attractive. In this work, α-Fe 2 O 3 /TiO 2 were grown on fluorine doped tin oxide (FTO) substrates by hydrothermal method for photoelectrochemical reduction of Cr(VI). Compared with the separate α-Fe 2 O 3 and TiO 2 electrodes, the composite α-Fe 2 O 3 /TiO 2 electrodes show higher photocurrent density. Under visible light irradiation, 100% removal efficiency of Cr(VI) was obtained after 40 min treatment. The composite α-Fe 2 O 3 /TiO 2 electrodes showed an enhanced absorbance in visible light region and had good stability to photoelectrochemical reduction of Cr(VI). The role of hole scavengers (citric acid and oxalic acid) and pH values was systematically investigated. This novel intensification approach provides new insight on the application of photoelectrochemical reduction in environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2022
·Vol. 18
·期 1
·e2840
·
IF 1.777
Qiaolin Ren,Ruirui Yang,Junying Li,Wenjun Yan,Zhongde Wang,Ailian Wu
Electrocatalytic oxidation technology has been proved as an efficient method for degradation in organic wastewater. The service lifetime and degradation efficiency of the electrode, one crucial struggle, limits the broad application of electrocatalytic oxidation technology. Herein, a Ru/Ir doped TiO 2 electrode with a long service lifetime was developed. Accelerated life experiment showed that the service life of an electrode was 33 h when the concentration of sulfuric acid was 1 M and the current density was 2000 mA·cm −2 . The influence on the phenol degradation was evaluated by researching the operating parameters. In particular, the possible mechanism of phenol removal at different pH is elucidated. It is found that acidic environment is favorable for chemical oxygen demand (COD) and phenol removal at a current density of 20 mA·cm −2 , pH 3 at 800 ppm NaCl, which can make the removal rates of phenol and COD with Ru/Ir doped TiO 2 anode up to 97.21% and 100%. In addition, it was demonstrated that the hydroxyl radicals play a foremost role in the degradation of phenol. Given the well stability and high service life, the Ru/Ir doped TiO 2 electrode holds promise for further industrial application in wastewater treatment.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Di Zhang,Sidong Zhang,Yanyan Fang,Dongmei Xie,Xiaowen Zhou,Yuan Lin
Introducing bifunctional linkers (COOH-R-SH) between TiO 2 electrodes and quantum dots (QDs) was an effective apprIntroducing bifunctional linkers (COOH-R-SH) between TiO 2 electrodes and quantum dots (QDs) was an effective approach in preparation of quantum dot-sensitized solar cells (QDSCs). Three types of linkers (4-mercaptobenzoic acid (MBA, R =phenyl), 3-thiophenecarboxylic acid (TPA, R =thiophene), and thioglycolic acid (TGA, R =alkyl)) were used to functionalize TiO 2 electrodes and prepare TiO 2 /CdSe QDSCs with photoelectric conversion efficiency (PCE) of 5.50%, 4.59% and 4.85%, respectively. Various properties of modified and blank TiO 2 electrodes, such as QDs loading, absorbance, work function, interfacial charge injection, recombination and their influence on PCE were investigated. In spite of low adsorption amounts of MBA on TiO 2 , the phenyl MBA-TiO 2 electrodes obtained the highest Cd content due to regular arrangement and strong affinity to QDs. The FTIR spectra proved strong interactions between MBA and TiO 2 electrodes, leading to fast electron injection from QDs to TiO 2 electrodes. The electron injection rate in MBA-TiO 2 electrodes was the same as blank-TiO 2 , larger than TGA- and TPA-ones. Work function of TiO 2 electrodes modified by linkers could reduce several eV , in which the MBA-one decreased less, corresponding to the highest applied potential difference. The open-circuit voltage-decay measurement demonstrated that the MBA-TiO 2 photoanodes had the least charge recombination. Enhanced light absorption capacity and fast electron injection rate were two key points for modified cell to improve short-circuit current, while low recombination and appropriate energy level positions increased open-circuit voltage. Those make MBA-TiO 2 photoanodes obtain the best efficiency of 5.50%. We expected this work to guide the selection of linkers for design and optimization of photoanodes interface of QDSCs.oach in preparation of quantum dot-sensitized solar cells (QDSCs). Three types of linkers (4-mercaptobenzoic acid (MBA, R =phenyl), 3-thiophenecarboxylic acid (TPA, R =thiophene), and thioglycolic acid (TGA, R =alkyl)) were used to functionalize TiO 2 electrodes and prepare TiO 2 /CdSe QDSCs with photoelectric conversion efficiency (PCE) of 5.50%, 4.59% and 4.85%, respectively. Various properties of modified and blank TiO 2 electrodes, such as QDs loading, absorbance, work function, interfacial charge injection, recombination and their influence on PCE were investigated. In spite of low adsorption amounts of MBA on TiO 2 , the phenyl MBA-TiO 2 electrodes obtained the highest Cd content due to regular arrangement and strong affinity to QDs. The FTIR spectra proved strong interactions between MBA and TiO 2 electrodes, leading to fast electron injection from QDs to TiO 2 electrodes. The electron injection rate in MBA-TiO 2 electrodes was the same as blank-TiO 2 , larger than TGA- and TPA-ones. Work function of TiO 2 electrodes modified by linkers could reduce several eV , in which the MBA-one decreased less, corresponding to the highest applied potential difference. The open-circuit voltage-decay measurement demonstrated that the MBA-TiO 2 photoanodes had the least charge recombination. Enhanced light absorption capacity and fast electron injection rate were two key points for modified cell to improve short-circuit current, while low recombination and appropriate energy level positions increased open-circuit voltage. Those make MBA-TiO 2 photoanodes obtain the best efficiency of 5.50%. We expected this work to guide the selection of linkers for design and optimization of photoanodes interface of QDSCs.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Yaohua Yang,Kai Yan,Jingdong Zhang
A Ni(OH) 2 /TiO 2 photoanode possessing high photoelectrocatalytic activity toward glucose oxidation driven by visible light was fabricated. The results indicated that deposition of Ni(OH) 2 on TiO 2 film electrode could remarkably promote the catalytic oxidation of glucose under visible light illumination. By applying a low voltage, the Ni(OH) 2 /TiO 2 electrode showed a linear photoelectrochemical response to glucose in the concentration range from 0.5 μM to 20 μM. Furthermore, the high photoelectrocatalytic activity of Ni(OH) 2 /TiO 2 electrode toward glucose oxidation was utilized to construct a glucose-air photofuel cell, which generated electrical signal responding to glucose concentration from 5 μM to 100 μM, without using external electrical power supply. Thus, dual non-enzymatic glucose sensors based on photocatalytic oxidation of glucose on the Ni(OH) 2 /TiO 2 electrode under visible light illumination were demonstrated.
研究领域:
生物医学工程
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材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Dong Chen,Yanting Lu,Jiaojiao Wu,Nan Li,Yan-Zhen Zheng,Xia Tao
In this study, a self-powered photoelectrocatalytic (PEC) device was designed using multi-walled carbon nanotubes (CNTs) and methylamine (CH 3 NH 2 ) modified perovskite solar cells (PSCs) as the power source and CNT/TiO 2 as the photoanodes . In the PSCs, CNTs and CH 3 NH 2 were used to modify the interface between the perovskite and carbon electrode to improve the photoelectronic performance. In particular, CH 3 NH 2 induced surface-healing of the CH 3 NH 3 PbI 3 perovskite thin films and the CNTs acted as a charge transport pathway among individual perovskite nanoparticles to facilitate the collection of photogenerated holes by the carbon electrode. A power conversion efficiency of 10.39% was achieved after modification with the CNTs and CH 3 NH 2 . In the photoanodes, the CNT-modified TiO 2 electrode accelerated the electron–hole separation and transportation, thereby improving the degradation performance. After assembling the PSCs modified using CNT and CH 3 NH 2 with CNT/TiO 2 , the solar-driven PEC system exhibited a high PEC degradation rate with rhodamine B (RhB). The optimal degradation efficiency for RhB with the tandem device was close to 100% after 80 min. This low-cost tandem assembly has promising applications in pollutant degradation research.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Micro & Nano Letters
·
2021
·Vol. 16
·期 3
·232-238
·
IF 1.102
Altan Bolag,Qiaoling Wang,Linan Liu,Tumenkhuslen Jamiyansuren,Ugtakhbayar Tumurpurev,Norovsambuu Tuvjargal,Tana Bao,Jun Ning,Hexig Alata,Ojiyed Tegus
An effective and efficient photovoltaic performance is significantly affected by the interface between different constituents of dye sensitized solar cells (DSSC). A novel dual post treatment of TiCl 4 and urea solutions on different layers of TiO 2 electrode is addressed and the TiO 2 particle morphology, dye-adsorption amount on the TiO 2 electrode and the photovoltaic performance of the DSSC based on those electrodes are characterised in this work. TiCl 4 treatment can form more binding site on TiO 2 particles and urea treatment structures a thin layer of g-C 3 N 4 on the surface of TiO 2 particles. This strategy can not only effectively increase the dye-adsorption for light-harvesting, but also facilitate the electron transfer through inhibiting the charge recombination between TiO 2 and electrolyte, and moreover, it provides excess electrons for the photoanodes. The DSSC fabricated from TiO 2 electrode processed with urea treatment on the sixth layer exhibited the highest power conversion efficiency of 8.94% with a short current density J sc of 24.09 mA cm –2 , an open circuit voltage V oc of 583 mV and a fill factor of 63.8.
研究领域:
材料科学
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可再生能源
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太阳能电池
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电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）