Inorganic Chemistry Frontiers
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2022
·Vol. 9
·期 18
·4685-4694
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IF 7.779
Peicheng Wei,Yan Wen,Kaifeng Lin,Xin Li
Building a photoelectrochemical cell to drive water decomposition into hydrogen and oxygen is a feasible way to access clean energy, but the unideal charge transfer path between the cocatalyst and the substrate greatly limits its application. We have developed a facile route for the preparation of a very small and highly crystalline CoFe layered double hydroxide (LDH) cocatalyst on a BiVO4 electrode through a low temperature chemical bath process. Unlike the conventional successive amorphous CoFe LDH layer coatings achieved through the electrodeposition process, the tiny and crystalline CoFe nanoparticles can close the “shunt channel” between the cocatalyst and the substrate, and the recombination of photogenerated charge caused by back-reaction is inhibited. Also, the interface between crystalline CoFe nanoparticles and BiVO4 has fewer surface trapped states compared with that of amorphous CoFe LDH layers. The CoFe/BiVO4 photoanodes showed a desirable photocurrent of 4.3 mA cm−2 at 1.23 V vs. RHE, and the maximum applied bias photon-to-current efficiency (ABPE) for the crystalline CoFe/BiVO4 photoanode was calculated to be 1.2% at 1.01 V, consistent with 1.5 times enhancement over that of amorphous CoFe/BiVO4 and nearly 4 times enhancement over that of BiVO4.
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
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Li Li,Mingqing Li,Huan Liu,Boya Li,Baohui Wang
BiOI film was electrodeposited deposited on fluorine doped tin oxide (FTO), then it was transformed into a nanoporous BiVO 4 film by annealing at 420 °C. The BiVO 4 /FTO electrode is used as photoelectrochemical (PEC) sensor to detect ascorbic acid (AA) for the first time. Under illumination of low power 20 W LED lamp, the current density of the sensor increases with the increase of AA concentration. The proposed PEC sensor exhibited a sensitive detection for AA in a wide range from 5 μM to 300 μM with a low detection limit of 1 μM (S/N = 3) and sensitivity of 293 μA mM −1 cm −2 . A portable AA detection device was constructed with a 20W LED lamp as the light source, BiVO 4 /FTO electrode as an anode, Pt as a cathode, and ammeter as a photoelectric signal receiver. The concentration of AA detected by this device is close to that measured by the electrochemical workstation (RSD<10%), which makes the sensor practical and portable.
研究领域:
分析化学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2016
·Vol. 29
·期 1
·305-311
·
IF 2.471
Min Liu,Yu-Xiang Yu,Wei-De Zhang
In this study, a non-enzymatic hydrogen peroxide photoelectrochemical (PEC) sensor based on nanoporous BiVO 4 film electrode is fabricated by electrodeposit of nanoporous BiOI film on fluorine-doped tin oxide glass (FTO) and subsequent conversion to BiVO 4 by annealing at elevated temperature. The electrode exhibits excellent visible light photoelectrochemical activity, and H 2 O 2 works as a hole scavenger to react with light-induced electron holes on the valence band of BiVO 4 . Upon illumination and at applied bias potential of +0.2 V, the photocurrent density is linearly correlated to the concentration of H 2 O 2 . The linear determination range of H 2 O 2 is 9.54–764.76 μM with a corresponding correlation coefficient of 0.9997, a detection limit of 1.59 μM (S/N=3), and sensitivity of 182.6 μA mM −1 cm −2 . The optimum bias potential, most suitable film thickness, anti-interference performance, and impedance are also explored. The sensor shows good response towards H 2 O 2 and displays a promising prospect for non-enzyme PEC H 2 O 2 sensor.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Fang Li,Wei Zhao,Dennis Y.C. Leung
Photoelectrocatalytic hydrogen production is a clean and sustainable way to combat energy crises and environmental issues. The performance of BiVO 4 which acts as a promising photoanode could be effectively enhanced by loading with Bi nanoparticles. In this study, a viable method to fabricate Bi/BiVO 4 electrode was proposed to enhance hydrogen production through a photoelectrocatalytic reaction. The results indicated that Bi nanoparticles loaded under optimal condition could obviously increase the photocurrent density of the BiVO 4 electrode from 0.9 mA cm −2 to 2.0 mA cm −2 under visible light illumination. Furthermore, the photoelectrochemical hydrogen production efficiency could have a 2.5-fold improvement with the addition of 20 ppm phenol. The possible mechanism of the enhanced performance and the function of phenol in the overall reaction was discussed.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2020
·
IF 7.1
Weiwei Meng,Lei Dai,Yuehua Li,Zhangxing He,Wei Meng,Huizhu Zhou,Ling Wang
Mixed potential NH 3 sensors with La 9.95 K 0.05 Si 5 AlO 26.45 (LKSAO) as the solid electrolyte and Bi 1-x Ag x VO 4- δ as the sensing electrode (SE) were developed. Bi 1-x Ag x VO 4- δ was produced by solid state reaction and then characterized by XRD, XPS, SEM and EDS. As revealed from the results, The BiVO 4 samples exhibit an unchanged crystalline structure after Ag doping molar amount x≤0.2, accompanied by the growth of the particle. The sensor based on Bi 1-x Ag x VO 4 - δ exhibit the noticeably enhanced sensing performance to NH 3 in contrast to the sensor using BiVO 4 , including its larger response potential (Δ V ) and higher sensitivity. For instance, the sensors based on BiVO 4 and Bi 0.8 Ag 0.2 VO 4 - δ at 400 °C exhibit the sensitivities of -28.1 and -77.3 mV/decade, respectively. Nevertheless, by Ag doping, there is no effective improvement of the anti-interference ability of the sensor against NO and NO 2 . To address the mentioned problem, CuO, NiO and La 0.8 Sr 0.2 MnO 3 (LSM) were used as reference electrodes (RE). As suggested from the results, using CuO and NiO as the reference electrodes can obviously reduce the cross-sensitivity of the sensor to NO and NO 2 , whereas the sensitivity slightly decrease.
研究领域:
材料科学
·
传感技术
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产品关联
DOI
高影响因子
Advanced Powder Materials
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2021
·
IF 0
Xingsheng Hu,Yan Li,Xinxin Wei,Lei Wang,Houde She,Jingwei Huang,Qizhao Wang
The cobalt−carbonate (CoCi)/NiFeOOH double-layer co-catalyst was prepared on bismuth vanadate (BiVO 4 ). Compared with the same type of electrode (Co−Pi/NiFeOOH/BiVO 4 and Co−Sil/NiFeOOH/BiVO 4 ), the photoelectrochemical (PEC) performance of the composite electrode presents the most excellent performance. The Co−Ci/NiFeOOH/BiVO 4 electrode prepared by photoelectric deposition (PED) achieves a photocurrent density of 4.1 mA/cm 2 at 1.23 V vs RHE, and the applied bias photon-current efficiency (ABPE) is up to 0.95%. In addition, with the help of the equivalent circuit fitting in electrochemical impedance spectroscopy (EIS), the charge transfer resistance ( R ct ) of Co−Ci/NiFeOOH/BiVO 4 is only 108.9 Ω, which is 16% that of BiVO 4 . The enhanced PEC performance of Co−Ci/NiFeOOH/BiVO 4 in the double-layer cocatalyst system is attributed to the outstanding advantages of Co−Ci cocatalyst in oxygen vacancy defects, superior to other cobalt-based catalysts in promoting charge transfer and improving the kinetics of water oxidation. This makes Co−Ci co-catalyst become one of the favorable competitors in the field of photoelectric catalysis.
研究领域:
材料科学
·
电化学
·
能源转换与存储
✓ 已验证
DOI
危险品化学品经营许可证（带存储）