SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jingwei Zhao,Chaozhu Huang,Shendan Zhang,Fengdong Qu,Rui Wang,Heng Jiang,Minghui Yang
This paper has developed a fuel cell type methanol sensor based on platinum-decorated mesoporous chromium nitride (CrN). Mesoporous CrN is prepared by the zinc-oxygen precursor ammonolysis method, and the polyol method is adopted to load Pt on CrN and XC-72R carbon blacks. The sensor device manufactured by the hot-press process is tested at room temperature and without additional external voltage. The Pt/CrN sensor presents better stability compared with the Pt/C. The overall change in response current of the Pt/CrN sensor is relatively small within one month, while the Pt/C sensor deteriorates faster. Furthermore, the sensitivity of Pt/CrN is 0.0402 μA/ppm, which is 3.26 times higher than that of Pt/C. The Pt/CrN sensor also displays excellent reproducibility. This study indicates that CrN as a kind of supporting material is provided with good application prospects in methanol gas sensing.
研究领域:
材料科学
·
化学传感器
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Longbin Chen,Pengqi Hai,Yaodong Yang,Chao Wu,Yongming Hu,Wei-Feng Rao
Combining metal with ferroelectrics is one of the reliable strategies to enhance the photocatalytic water splitting of ferroelectrics dramatically. However, the metal loading ratio is directly related to the synergistic effect of catalysts. In order to find the appropriate loading of Pt, we fabricated SrBi 4 Ti 4 O 15 (SBTO) nanosheets (NSs) and deposited different amounts of Pt nanoparticles (NPs) to form heterojunction. The optoelectronic characterizations verified that the Pt-modified SBTO NSs have broadened absorption of visible light; produce more long-lived charge carriers. The photocatalytic hydrogen production can reach 11700 μmol g −1 under continuous illumination for 3 h from the sample containing 6 wt% Pt, showing a much higher hydrogen evolution rate than other ferroelectric materials under similar reaction systems. Our work provides a valuable and feasible solution to produce hydrogen from water.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Haoyu Zhan,Baixue Cheng,Yankun Lu,Danning Xing,Xingshuai Lv,Huining Huang,Thomas Frauenheim,Tao Wang,Peng Zhou
Co 3 O 4 possesses both direct and indirect oxidation effects and is considered as a promising catalyst for the oxidation of 5-hydroxymethylfurfural (HMF). However, the enrichment and activation effects of Co 3 O 4 on OH − and HMF are weak, which limits its further application. Metal defect engineering can regulate the electronic structure, optimize the adsorption of intermediates, and improve the catalytic activity by breaking the symmetry of the material, which is rarely involved in the upgrading of biomass. In this work, we prepare Co 3 O 4 with metal defects and load the precious metal platinum at the defect sites (Pt-Vco). The results of in-situ characterizations, electrochemical measurements, and theoretical calculations indicate that the reduction of Co–Co coordination number and the formation of Pt–Co bond induce the decrease of electron filling in the antibonding orbitals of Co element. The resulting upward shift of the d -band center of Co combined with the characteristic adsorption of Pt species synergically enhances the enrichment and activation of organic molecules and OH − species, thus exhibiting excellent HMF oxidation activity (including a lower onset potential (1.14 V) and 19 times higher current density than pure Co 3 O 4 at 1.35 V). In summary, this work explores the adsorption enhancement mechanism of metal defect sites modified by precious metal in detail, provides a new option for improving the HMF oxidation activity of cobalt-based materials, broadens the application field of metal defect based materials, and gives an innovative guidance for the functional utilization of metal defect sites in biomass conversion.
研究领域:
材料科学
·
化学工程
·
生物质转化
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yuming Tan,Pinghua Tang,Yong Zhang
The development of high-performance ammonia sensors is crucial for environmental monitoring and human health protection. However, traditional conductive metal oxide gas sensors encounter significant challenges such as poor selectivity and high detection limit, mainly raising from their inherent cross-sensitivity and thick gas-sensing layer caused by uncontrollable preparation. Herein, a noble metal platinum-modified tungsten oxide (Pt/WO 3 ) gas sensor is controllably fabricated via inkjet printing technology and magnetron sputtering. In addition to a detection limit toward ammonia as low as 40 ppb, the Pt/WO 3 gas sensor demonstrates a good selectivity for ammonia compared to other interfering gases, including acetone, sulfur dioxide, formaldehyde, methane, sulfur hexafluoride, and toluene, with corresponding selectivity coefficients not less than 4.7. The high sensitivity of the gas sensor is mainly attributed to the fact that more electrons can be directly controlled by the adsorbed gas benefiting from the micro-nano thickness of the sensing layer, as well as additional adsorption sites are provided by the Pt modification. Moreover, the catalytic effect of Pt on the reaction between ammonia and oxygen ions further enhances its sensitivity while also improving its selectivity. Our work establishes an important theoretical and experimental foundation for the design of high-performance ammonia sensors.
研究领域:
材料科学
·
环境科学
·
传感器技术
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Ying Liu,Jingyuan Liu,Qi Liu,Hongsen Zhang,Zhanshuang Li,Xiaoyan Jing,Yi Yuan,Hongquan Zhang,Peili Liu,Jun Wang
In recent years, room temperature ionic liquids (RTILs) have been highly utilized in electrochemical fields. Specifically, ionic liquids (ILs) as electrolytes augur promising potential for the next generation of advanced and miniaturized electrochemical gas sensors. In this paper, 1-ethyl-3-methylimidazolium hexafluorophosphate ([EMIM][PF 6 ]), 1-propyl-3-methylimidazolium hexafluorophosphate ([PMIM][PF 6 ]) and 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF 6 ]) were synthesized through a facile one-pot method. We found that [EMIM][PF 6 ] and [PMIM][PF 6 ] exist in the solid state at room temperature. Hence, these ILs can effectively avoid the leakage of electrolytes. However, [BMIM][PF 6 ] can be present in liquid state at room temperature as the melting point decreases, due to the increasing of alkyl chain (C n , n < 6) for the ILs. Compared to solid electrolyte gas sensors, sensors based on liquid electrolytes offer a reliable response and achieve sufficient ion mobility to sense oxygen. Our work provides an incentive to enhance the properties of a liquid electrolyte by mixing it with Pt-modified ordered mesoporous carbons (Pt-OMCs), which not only prevents the aggregation of OMCs but also provides a large number of active sites for oxygen reduction. The limit of detection (LOD) in oxygen sensors based on Pt/CMK-3-COOH-[BMIM][PF 6 ] is relatively low (1.10% O 2 ). Our results indicate that the synergistic combination of ILs and Pt-OMCs markedly promotes the performance of electrochemical oxygen sensors.
研究领域:
材料科学
·
电化学传感器
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Aiqun Kong,Mao Peng,Menghui Liu,Ye Lv,Houjun Zhang,Yusheng Gao,Jing Liu,Yan Fu,Wei Li,Jinli Zhang
Herein, we developed a novel and simple strategy to construct Pt-decorated TiO 2 /β-Ni(OH) 2 nanosheet arrays that steadily deliver large current densities in alkaline electrolyte. It is of great interest to find that the versatile role of few-layered Ti 3 C 2 endows the unique growth mechanism of Pt/TiO 2 /β-Ni(OH) 2 . It is worth noting that the interconnected array electrode exhibits noticeable hydrogen evolution reaction (HER) performance, achieving ultralow overpotentials of 107, 145 and 184 mV at high current densities of 500, 1000 and 1500 mA cm −2 , respectively, which outperforms most reported HER electrocatalysts. It requires only 1.95 V to drive 1000 mA cm −2 towards full water electrolysis along with considerable stability. It is demonstrated for the first time that the synergistic effect of Pt and TiO 2 /Ni(OH) 2 the enhanced HER performance. This work reports a robust nanoarray support for Pt electrocatalyst to break through its intrinsic barrier in alkaline HER and under large current density.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Juan Feng,Changhua An,Linxiu Dai,Junxue Liu,Guijuan Wei,Song Bai,Jun Zhang,Yujie Xiong
To seek robust active photocatalysts for sunlight-driven water splitting, a variety of semiconductor materials have been developed to achieve high photocatalytic efficiency. In this work, the CdS nanoplates with rough surface have been synthesized through a two-step ionic-exchange route. The as-synthesized sample was modified by Pt in an in situ photo-deposition cell to fabricate hybrid Pt/CdS nanophotocatalyst. The rate of average solar hydrogen evolution over the Pt/CdS nanoplates reached 3.75 mmol h −1 g −1 , which is significantly higher than that of bare CdS and NiS/CdS counterparts. Furthermore, the Pt/CdS exhibited very high stability in continuous solar H 2 evolution at a relatively stable state even over a 16-day reaction period, implying the as-fabricated hybrid nanophotocatalyst is approaching the practical requirements. The significantly enhanced photocatalytic efficiency was ascribed to the merits of rough plate-like nanostructures and the assistance of Pt co-catalyst, which can promote the light-absorption capability and photo-carrier separation as well as provide reactive sites. The present work opens an avenue to construct efficient and stable solar-driven catalysts for new energy creation.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 47
·23732-23742
·
IF 7.443
Li Zhang,Xianliang Fu,Sugang Meng,Xiaoliang Jiang,Jinghui Wang,Shifu Chen
Noble metal-modified CdS is one of the most promising photocatalysts for solar H2 production due to its intrinsic band structure merits. It is highly desirable to develop an effective preparation route to pursue a high photocatalytic performance and to minimize the use of costly noble metals. For the first time, a simple and convenient one-pot solvothermal (OPS) method was developed to prepare platinized CdS nanorods (Pt/CdS-N) in this work. The formation of a hexagonal 1D structure CdS and the deposition of Pt(0) can be achieved simultaneously by the method, which is more efficient than the conventional post-deposition routes, such as photochemical reduction and impregnation–reduction methods, to enhance the photocatalytic activity of CdS-N for the H2 evolution reaction (HER). The H2 evolution rate (rH2) of CdS-N could be remarkably improved from 2.10 to 10.29 mmol h−1 g−1 by loading with only 0.06% Pt (wt%) under visible light irradiation (λ > 400 nm, 300 W Xe lamp). No deactivation of the sample was observed in cyclic experiments for 20 h reaction. This loading amount of Pt is substantially lower than the reported optimal values (commonly in the range of 0.5–2%) by more than one order of magnitude. A criterion of enhancement coefficient was proposed to identify the ideal loading amount of Pt. The result indicates that, considering the improvement efficiency of rH2 and the loading amount of Pt, this ultra-low amount of Pt is more practical than the optimal amount (determined to be 0.5%). The high and stable activity of Pt/CdS-N can be attributed to the hexagonal 1D structure of CdS and the high dispersion of Pt in the Pt(0) state. Besides Pt, the OPS method is also valid for the deposition of Pd or Ru on CdS and rH2 decreases in the order Ru/CdS-N (12.89) > Pt/CdS-N (10.29) > Pd/CdS-N (6.72 mmol h−1 g−1) with a loading amount of 0.06%. It reveals that the use of noble metal co-catalysts can be significantly reduced without unduly sacrificing the HRE efficiency. The developed OPS route provides a new insight into the preparation of highly efficient and stable chalcogenide photocatalysts for the HER.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yucheng Wang,Azhar Ali Haidry,Adil Raza,Zhe Wang,Fazal Ghani,Yanling Weng,Nouf H. Alotaibi,Saikh Mohammad
Platinum modified ordered mesopore TiO 2 (OMT:X Pt) with tunable channel was synthesized via soft-templet method known as Evaporation Induced Self-Assembly (EISA). Both porosity and metal doping have a significant impact on how metal oxide semiconductors respond to humidity. Thus, based on earlier studies, Pt-doped ordered mesoporous TiO 2 was synthesized and described under optimal conditions. From nitrogen adsorption and desorption analysis, while it was found that the specific surface area decreased (from 240 to 125 m 2 /g), pore size increased (from 4 to13 nm). The humidity sensing performance of the Pt-modified OMT is investigated by dynamic sensing system. The sensor based on 5 wt% Pt-doped OMT showed high response (SR ∼ 10 5 ), fast response time (26 s) to 95 % relative humidity (RH) and good long-term stability (over 90 days). To understand and authenticate the sensing mechanism, the structure and morphology of synthesized Pt-doped OMT was performed by BET, SEM, HRTEM, XRD and XPS. Furthermore, a plausible sensing mechanism is discussed on basis of the obtained results.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2024
·Vol. 14
·期 4
·283
·
IF 3.8
Zhishun Wei,Yuanyuan Ji,Zuzanna Bielan,Xin Yue,Yuqi Xu,Jiajie Sun,Sha Chen,Guoqiang Yi,Ying Chang,Ewa Kowalska
Photocatalysis is considered as an environmentally friendly method for both solar energy conversion and environmental purification of water, wastewater, air, and surfaces. Among various photocatalytic materials, titania is still the most widely investigated and applied, but more efforts must be carried out considering the synthesis of highly efficient photocatalysts for multifarious applications. It is thought that nanoengineering design of titania morphology might be the best solution. Accordingly, here, titania mesocrystals, assembled from crystallographically oriented nanocrystals, have been synthesized by an easy, cheap, and “green” solvothermal method (without the use of surfactants and templates), followed by simple annealing. The obtained materials have been characterized by various methods, including transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD) and diffuse reflectance spectroscopy (DRS). It has been found that the as-obtained photocatalysts exhibit a unique nanorod-like subunit structure with excellent crystalline and surface properties. However, pristine titania is hardly active for a hydrogen evolution reaction, and thus additional modification has been performed by platinum photodeposition (and silver as a reference). Indeed, the modification with only 2 wt% of noble metals results in a significant enhancement in activity, i.e., ca. 75 and 550 times by silver- and platinum-modified samples, respectively, reaching the corresponding reaction rates of 37 μmol h−1and 276 μmol h−1. Additionally, titania mesocrystals exhibit high oxidation power under simulated solar light irradiation for the degradation of antibiotics within the tetracycline group (tetracycline (TC), ciprofloxacin (CIP), norfloxacin (NOR) and oxytetracycline hydrochloride (OTC)). It has been found that both experimental results and the density functional theory (DFT) calculations confirm the high ability of titania mesocrystals for oxidative decomposition of tetracycline antibiotics.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Chenmin Xu,Pengxiang Qiu,Huan Chen,Fang Jiang
Platinum modified indium oxide nanorods (Pt/IONRs) were synthesized and applied for photocatalytic degradation of perfluorooctanoic acid (PFOA). IONRs synthesized at 700 °C with 3 wt% Pt exhibited optimal activity in the degradation of PFOA. The improvement of photocatalytic efficiency is mainly ascribed to two aspects: the load of Pt and the rod-like structure, which could promote light harvesting and enhance the separation rate of charge carriers. Besides, the oxygen vacancies on the surface of photocatalyst may accelerate the degradation of PFOA as well. These results suggested that Pt/IONRs could be a promising photocatalyst for PFOA degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 20
·5803-5811
·
IF 5.726
Peng Bai,Xinli Tong,Yiqi Gao,Pengfei Guo
A novel photocatalytic selective oxidative transformation of amines to imines using water as a primary oxidant is achieved under oxygen-free conditions. In the presence a single 1%Pt@TiO2-500 catalyst, the photocatalytic oxidative coupling of benzylamine to N-benzylidenebenzylamine has been efficiently performed using water as an oxidant, in which a 99.8% conversion and a 92.5% selectivity were obtained at room temperature; meanwhile, a certain amount of hydrogen was detected that confirms the simultaneous occurrence of water splitting reaction. Further investigations revealed that the introduction of the Pt element facilitates the formation of O-holes on the surface of TiO2, which efficiently promotes the generation of active oxygen species from water and the following oxidative coupling of benzylamine. Then, the photocatalytic oxidative coupling of various aromatic and aliphatic amines with water as the primary oxidant were also studied, and excellent conversion and high selectivities to corresponding products were attained. Based on the control experiment and the catalytic principle, a possible reaction mechanism is proposed for the oxidative coupling of benzylamine with water as the primary oxidant.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）