Nanoscale
·
2024
·
IF 5.8
Maoyuan Li,Zhongrui Yu,Zulin Sun,Yuchen Liu,Simiao Sha,Jiancheng Li,Riyue Ge,Liming Dai,Bin Liu,Qingqiao Fu,Wenxian Li
Electrocatalyst materials play a crucial role in determining the efficiency of the hydrogen evolution reaction (HER), directly influencing the overall effectiveness of energy conversion technologies. Ni3S2/MoS2 heterostructures hold substantial promise as bifunctional catalysts, owing to their synergistic electronic characteristics and plentiful active sites. However, their catalytic efficacy is impeded by the relatively elevated chemisorption energy of hydrogen-containing intermediates, which constrains their functionality in different pH environments. In order to mitigate this limitation, trace amounts of Pt are introduced into the heterostructure, intending to enhance electronic transport and refining chemisorption energies, thereby facilitating significant enhancements in both HER and oxygen evolution reaction (OER) activities over a wide pH range. It is revealed that the Pt-modified catalyst achieves exceptional HER performance, requiring merely 64 mV and 83 mV overpotentials to attain a current density of 100 mA cm−2 in acidic and alkaline media, respectively. Furthermore, theoretical simulations corroborate that Pt modification optimizes local electronic configurations and augments electronic transfer, contributing to its superior catalytic performance. This investigation underscores the pivotal role of Pt modification in propelling the practical application of Ni3S2/MoS2 heterostructures as highly efficient and pH-universal bifunctional catalysts.
研究领域:
材料科学
·
电化学
·
能源转换技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Li Luo,Dekang Li,Yuying Dang,Wei Wang,Guangsuo Yu,Jin Li,Baojun Ma
A non-noble metal cocatalyst with capacitance is cost-effective and has excellent photocatalytic H2 evolution performance for water splitting. But the intrinsic action of capacitance is unclear. Here, by controlling the capacitance of Mo2C, we reported a volcanic curve relationship between the photocatalytic activity of Mo2C/CdS and the capacitance of Mo2C. At the middle capacitance of 18.95 F/g of Mo2C-a4, Mo2C-a4/CdS exhibits the best H2 evolution activity of 5560 μmol/g/h. When Pt is introduced on the surface of Mo2C, the photocatalytic activity of (Pt/Mo2C-a4)/CdS is further enhanced to 8090 μmol/g/h. Comparing the activities between (Pt/Mo2C)/CdS and Mo2C/CdS with the capacitance of Mo2C, the activity ratio and difference values increase and finally reach a plateau with the increasing capacitance. Electrochemical and photoelectrochemical studies demonstrate that the capacitance of Mo2C has dual opposite effects (positive and negative) in photocatalytic reactions. The capacitance can capture electrons and store them, thereby enhancing the separation efficiency of photoexcited carriers of CdS. However, overlarge capacitance constrains the stored electrons and prevents them from releasing, thus decreasing the cocatalytic efficiency, which can be resolved in some degree by introducing some Pt on Mo2C. This work elucidates the dual effects of capacitance and puts forward the concept of capacitance catalysis.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Yanwei Xiao,Shuhe Hu,Yuanyuan Liu,Ao Zhang,Zhen Yao,Ye Tian,Huiling Li,Yang Ning,Feng Li,Fengdong Qu,Dong Yao,Hao Zhang
Two-dimensional (2D) BiVO 4 nanosheets (NSs), featuring distinctive chemical properties and dangling-bond-rich surfaces, are promising for developing high-performance gas sensors. However, the previously reported 2D BiVO 4 NSs-based devices suffer from a low responsivity and poor selectivity. Here, catalytic metal (Pt) nanoparticles (NPs) are functionalized on the surface of BiVO 4 NSs to improve the sensing ability. Comparative investigations verify the significant enhancement in acetone sensing after Pt modification. The Pt NPs-loaded BiVO 4 exhibits a response of 12.5–100 ppm acetone, which is 3.2 times higher than that of pure BiVO 4 sensor. Besides, the Pt-BiVO 4 sensor possesses better selectivity and lower detection limit. From both the experimental results and density functional theory (DFT) calculation, the effects of Pt modification are elucidated as a synergy of chemical and electronic sensitization. The loading of Pt benefits the thickening of electron depletion layer , and accumulating and activating the acetone molecules, which accelerate the reaction between acetone and chemisorbed oxygen species, resulting in enhanced sensing performance. This work gives deep insights into the effects of noble metal modification on metal oxide-based sensing material and could serve as a guideline for further designing novel high-performance sensing materials.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Baoqing Han,Hairong Wang,Wanying Yang,Jiuhong Wang,Xueyong Wei
For advanced fibrosis, isoprene is a typical characteristic marker that could be used to quickly screen the population for chronic liver disease (CLD). To achieve trace detection of isoprene, different mol% Pt-decorated In 2 O 3 and pure In 2 O 3 samples were prepared with the commonly used hydrothermal method . The obtained characterization results show that the prepared Pt-decorated In 2 O 3 (1 mol%) sample had Pt nanoparticles uniformly attached to the surface of porous hierarchical In 2 O 3 nanosheets , and the specific surface area was 62.3 m 2 /g. Subsequently, these sensors based on Pt–In 2 O 3 and pure In 2 O 3 nanomaterials were prepared, and their response characteristics were studied. The results show that the response of 1 mol% Pt–In 2 O 3 to isoprene gas was significantly enhanced, and the optimal working temperature was 200 °C. The response of 1 mol% Pt–In 2 O 3 to 5 ppb and 5 ppm isoprene was approximately 3.2 times and 25.9 times that of pure In 2 O 3 , respectively. Meanwhile, the 1 mol% Pt-modified sample exhibited excellent selectivity for isoprene relative to other biomarkers (carbon monoxide, hydrogen, ethanol, and ammonia). The sensor shows good repeatability and long-term stability. Therefore, the developed 1 mol% Pt-decorated In 2 O 3 was expected to be applied as a gas-sensitive material for breath isoprene, which could be suitable for large-scale CLD rapid breath detection.
研究领域:
材料科学
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医学诊断
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传感器技术
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2025
·
IF 6.3
Danyang Wang,Menghan Xu,Kuangyi Li,Yong Yan,Xue Chen,Dongqi Yu,Rongrong Jia,Lei Huang
Ethanol sensors with low energy consumption and high performance have been applied in a wide range of areas. In this work, Pt-modified SnO 2 -TiO 2 composite nanomaterials prepared through ball milling and impregnation-reduction are fabricated for constructing microelectromechanical systems (MEMS) ethanol sensor. Tiny Pt nanoparticles are found uniformly dispersed on SnO₂-TiO₂. High quality gas-sensitive films are concentrated in the functional area of the MEMS chip. The loading of Pt significantly enhances the response to ethanol and reduced the optimal operating temperature. The 1.5% platinum-modified composite (A-ST) demonstrates a significant improvement in sensitivity to 50 ppm ethanol, with its response rising from 21.3 to 52.1, while the optimal operating temperature is reduced by 28°C, dropping from 288°C to 260°C. The limit of detection (LOD) is 240 ppb. This enhancement is primarily due to the n-n junction at the interface between SnO 2 and TiO 2 , along with the chemical and electronic sensitization effects generated by Pt on SnO 2 -TiO 2 .
研究领域:
材料科学
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传感器技术
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纳米科技
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 69
·36665-36670
·
IF 3.708
Juan Feng,Junxue Liu,Guijuan Wei,Jun Zhang,Shutao Wang,Zhaojie Wang,Changhua An
Hollow CdS nanostructures have been synthesized by a two-step ionic exchange route, which consists of a first synthesis of Ag2S intermediated hollow frames derived from the reaction of S2− ions with AgCl cube-tetrapods, and a subsequent ion-exchange conversion of the obtained Ag2S to CdS hollow nanoframes. The investigation of the corresponding transformation process with scanning electronic microscopy (SEM) revealed that the obtained CdS particles preserved the framework of the original template. The solar-driven hollow structured CdS modified with 5% (w/w) of promoter of Pt nanoparticles/nanoclusters manifested a high hydrogen evolution rate of 10.07 mmol h−1 g−1, corresponding to the apparent quantum yield of 9.6% measured at a single length of 435 nm, which is due to efficient charge separation, fast transport of the photogenerated carriers, and fast photochemical reaction at the CdS/Pt/electrolyte interfaces. The present work can benefit the development of other hollow structured nano-photocatalysts with high efficiency towards new energy applications.
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
LANGMUIR
·
2025
·
IF 3.9
Denghui Huang,Xiaolan Fu,Kaixin Wang,Zicheng Zheng,Liyuan Zhang,Zhizhen Ye,Jie Jiang,Zhong-kang Han,Liping Zhu
Oxygen vacancies play a crucial role in charge transport and surface states in semiconductor metal oxides, significantly influencing various research fields, such as photocatalysis and gas sensor. Developing effective strategies to generate oxygen vacancies and thereby enhance device performance is highly desirable. In this study, we proposed a water-based one-step electrospinning method to introduce hydroxyl groups, leading to the synthesis of Pt-decorated WO3 nanofibers (Pt-WO3(H2O)) with increased oxygen vacancies. Density functional theory calculations revealed that the dissociation energy of W–OH is lower than that of the W–O bonds, promoting the formation of oxygen vacancies via W–OH bond cleavage. These vacancies reduced the adsorption energy of acetone on the WO3 surface, enhancing surface interactions. Consequently, the Pt-WO3(H2O) sensor exhibited an ultrahigh response of 82 to 1.8 ppm acetone at 300 °C, which was about 1 order of magnitude higher than the one fabricated by conventional electrospinning. These findings indicate that water-based electrospinning is an effective technique for generating oxygen vacancies in metal oxide nanofibers. Our high-performance acetone sensor, capable of detecting low concentrations, holds great potential for applications in noninvasive health screening.
研究领域:
材料科学
·
传感器技术
·
计算化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 17
·12225-12234
·
IF 3.9
Zhixuan Wu,Zhengai Chen,Zhixiang Deng,Ning Dai,Yan Sun,Meiying Ge
In this work, a high-performance room-temperature ammonia (NH3) gas sensor based on Pt-modified WO3–TiO2 nanocrystals was synthesized via a two-step hydrothermal method. The structural properties were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The 10 at% Pt@WO3–TiO2 nanocrystals present the highest NH3 sensing performance at room temperature. Compared with the nanocrystals without Pt modification, the sensitivity of the Pt@WO3–TiO2 sensor is tenfold higher, with the lowest concentration threshold reaching the 75 ppb level. The response is approximately 92.28 to 50 ppm, and response and recovery times are 23 s and 8 s, respectively. The improved sensing was attributed to a synergetic mechanism involving the space charge layer effect and Pt metal sensitization, enhancing the electron transfer efficiency, oxygen vacancy and specific surface area. This study is expected to guide the development of high-performance room-temperature ammonia sensors for clinical breath testing.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
·
2024
·
IF 2.9
Zijie Su,Zhihua Zhao,Guixin Jin,Wei Chen,Xiaoqing Shen,Lan Wu
The focus of this work is to develop a sensitive and reliable acetone gas sensor using the Pt-modified Co 3 O 4 /CoMoO 4 heterojunction derived from metal-organic frameworks (MOFs). Pt-loaded Co 3 O 4 /CoMoO 4 heterojunction was successfully prepared by the surface redox method, and the composites exhibited high sensitivity and selectivity for acetone with a low detection limit. By modifying the Co 3 O 4 /CoMoO 4 material with platinum loading, the sensor achieved a response of 24.12 to 20 ppm acetone, which was significantly better than that of the pure Co 3 O 4 /CoMoO 4 heterojunction. This work not only improves acetone detection strategies, but also enhances the potential for industrial and medical VOC monitoring applications.
研究领域:
材料科学
·
传感技术
·
医学检测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2015
·Vol. 17
·期 7
·1-8
·
IF 2.184
Yu Ya-Nan,Lu Shi-Yu,Bao Shu-Juan
In this work, Bi 2 WO 6 nanoporous wall was synthesized by using Bi 2 O 3 as template and Bi source. Pt nanoparticles whose average size is about 8 nm were further immobilized on the Bi 2 WO 6 nanoporous wall via a simple chemical reduction process. Their photocatalytic activity and the effect of Pt modification were studied by analyzing the degradation of an organic dye, rhodamine 6G (Rh6G), under simulated sunlight. It was found that the photocatalytic ability of Bi 2 WO 6 nanoporous wall was enhanced by introducing Pt nanoparticles. Bare Bi 2 WO 6 shows a degradation efficiency of 78 % after 1 h, while the degradation efficiency of 5 wt% Pt-modified Bi 2 WO 6 was 99 %, and on further increasing the Pt content in the as-prepared Pt-modified Bi 2 WO 6 catalysts, their photocatalytic ability will decrease. The optimal catalyst could be reused without any decrease for five cycles, which may due to Pt be able to help trap the conduction band electrons in the absence of Rh6G. A possible photocatalytic mechanism was proposed and further proved by transient photocurrent response experiment.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Bowen Zhang,Chongyang Wang,Saisai Zhang,Xiangli An,Zhiyong Zhao,Hari Bala,Zhanying Zhang
In this work, highly regular TiO 2 array films consisting of nanorods with a diameter of ∼119 nm were grown on FTO via a facile hydrothermal method. Then Pt nanoparticles with a size of ∼5 nm were modified on the surface of TiO 2 nanorods via an in-situ reduction process. The gas-sensing performances of pristine TiO 2 and Pt-modified TiO 2 samples were systematically tested. The introduction of Pt nanoparticles could enhance the response and stability toward CO gas and decrease the optimal operating temperature from 400 °C to 360 °C. And the Pt/TiO 2 -based sensor with a Pt content of 1.5 wt% exhibits the maximum CO sensitivity. Furthermore, the adsorption energies of Pt-modified or Pt-doped TiO 2 for CO molecules were calculated using first-principles calculations. The chemical sensitivity of Pt to CO molecules may be responsible for the improved CO sensitivity. Additionally, the unique nanorod array structure of Pt/TiO 2 and the nano-Schottky junction generated between them are helpful in enhancing the gas-sensing property.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2012
·Vol. 2
·期 32
·12378-12383
·
IF 0
Xuefeng Hu,Huanhuan Ji,Lei Wu
Pure and Pt nanoparticle-modified rutile TiO2 were synthesized via hydrolysis of TiCl4 in the absence or presence of Pt nanoparticles. HRTEM, XRD, and SEM were used to characterize the structure of the prepared catalysts. The resulting modified TiO2 catalysts show extended visible light absorbance. Photodegradation of 2,4,6-trichlorophenol (2,4,6-TCP) over these photocatalysts was investigated under visible light illumination. The Pt nanoparticles facilitate the separation of photogenerated electron–hole pairs at low Pt content, then enhances the photodegradation rate of 2,4,6-TCP. 0.18Pt–TiO2 achieved the best photocatalytic activity among the tested catalysts. It was found that singlet oxygen rather than ˙OH acts as the main oxidative species for the degradation of 2,4,6-TCP according to the experimental results. The degradation intermediates of 2,4,6-TCP were identified and the degradation pathway was proposed. Pt nanoparticles on TiO2 significantly enhance O2 adsorption and the formation of ˙O2−. The rutile surface is a favorable condition for stabilizing ˙O2−. These properties of the Pt nanoparticle-modified rutile TiO2 facilitate the formation of 1O2via the reaction of superoxide anions with holes.
研究领域:
环境科学
·
材料科学
·
光催化技术
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）