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.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 22
·期 3
·817-824
·
IF 2.316
Liu Yong,Li Shenshen,Zhang Yunmao,Liu Weihua,Wang Jianhong,Zhai Cuiping
Honeycomb-like porous carbons (PCs) were synthesized using a facile self-assembly method with phenolic resin as the carbon source and tetraethyl orthosilicate (TEOS) as the silica source. The PCs were found to have a large BET surface area of 458 m 2 g −1 and a partially graphitized structure. The obtained PCs were used as a support for various Pt-Pd bimetallic alloy catalysts employed for methanol oxidation in alkaline media. Compared with Pt supported on commercial Vulcan XC-72R carbon (Pt/C) and with the other Pt-Pd bimetallic alloy catalysts on PCs, Pt 3 Pd 1 on PCs displayed the most negative onset potential for methanol oxidation and the highest steady-state current (2.04 mA cm −2 ). This may be because the Pt 3 Pd 1 /PCs catalyst has the largest electrochemical active surface area (ESA), and because adding Pd to the catalyst improves the ability of the intermediate species to tolerate oxidation. The results show that the prepared Pt-Pd/PCs is a potential candidate for application as a catalyst in alkaline direct methanol fuel cells.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Haidong Chen,Feng Zhang,Xianwen Sun,Weifeng Zhang,Guoqiang Li
We systematically investigated the impact of reaction atmosphere on the Pt cocatalyst photodeposition and hydrogen evolution . A long induction period which is hardly found in close-system appears in the presence of oxygen, and is affected by the concentration of chloroplatinic acid. The Pt cocatalyst is metal state and contributes to the electronic states near Fermi level judging from the valence band X-ray photoelectron spectrum. The cocatalyst metal Pt will reduce the surface photovoltage signals due to the metal feature. The hydrogen evolution rate increased and reached a platform with increasing the Pt coverage on the surface of photocatalyst which is characterized by the Pt:Ti atomic ratio.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Fuwen Yang,Jie Zhang,Jinwei Chen,Gang Wang,Tong Yu,Junyu Zhao,Qian Li,Zongbo Shi,Runsheng Zhuo,Ruilin Wang
Propane dehydrogenation (PDH) provides a promising way to meet the requirement of propylene supply, but the commonly-used Pt-based catalysts still suffer from unsatisfactory stability and deactivation. Herein, an interfacial regulation strategy is developed to construct the Cu, Pt, and Zn species modified hollow porous silicalite-1 (CuPt/Zn-HPS-1). Owing to the regulation role of Pt, the electron-deficient [ZnOH] + Lewis acid sites accelerated the C-H activation, which was beneficial to achieve the excellent PDH performance. More importantly, the additionally introduced Cu 2+ further modulated the geometric structure and electronic density of Pt, thus effectively improving the anti-sintering ability and alleviating the coke deposition. Benefiting from the interfacial regulation and Lewis active [ZnOH] + sites, the optimal CuPt/Zn-HPS-1 catalyst exhibited an excellent catalytic PDH performance with the initial propane conversion of 30.4 % and propylene selectivity of 99.0 %. The CuPt/Zn-HPS-1 also demonstrated robust recycling stability in reaction-regeneration cycling test with the smaller deactivation rate constant. This work affords a strategy for improving PDH performance in practical industrial application.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANOMETALLIC CHEMISTRY
·
2024
·
IF 2.1
Yu Wei,Yingxia Wu,Xuejin Li,Juan Zhang,Honghong Chang,Wenchao Gao,Fanhui Meng,Peng Yang
This paper report a cost-effective, green, and acceptorless dehydrogenative one-pot synthesis of indole derivatives from ethylene glycol and aniline derivatives using an acidic alumina-supported Pt nanoparticle catalyst (Pt/Al 2 O 3 ) with 3 wt% Pt loading. The indole yield could reach more than 50 %, which was further expanded to synthesize eight indole derivatives including 5-methoxyindole. Catalyst characterisation showed that Pt/Al 2 O 3 was weakly acidic catalyst, the Pt particles were highly dispersed in nano-size on the surface of the Al 2 O 3 . The mechanistic studies shows that the indoles proceeded via successive dehydrogenation, condensation and dehydration steps with high showed atomic efficiency, with N -(2-Hydroxyethyl) aniline as the key intermediate, and N,N' -diphenylethylenediamine and 1,4-diphenylpiperazine as the main by-products.
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Jiamin Li,Shenghong Li,Shihao Lu,Xuhui Geng,Yafeng Guan
A micron-scale bilayer sensor was fabricated in situ by electrohydrodynamic jet printing for detecting H 2 gas with highly selectivity, sensitivity and stability. The sensor consisted of a Pt loaded mesocellular silica foam (Pt-MCF) catalytic filter layer, and a ZnO/SnO 2 /Au (ZSA) sensing layer. Benefiting from the selective catalytic oxidation for CO in the catalytic filter layer, the cross-interference of CO on this sensor was reduced from 58 % to 15 %. The sensor also demonstrated a satisfactory selectivity to H 2 in interfering gases of CO 2 and CH 4 due to its high specific response to H 2 . In the ZSA sensing layer, the n-n heterojunction (ZnO-SnO 2 ) and abundant active sites on the Undaria pinnitafida -like curved nanosheet structure effectively enhanced the response of H 2 by 6.7 times. The sensors exhibited a wide H 2 dynamic range of 0.5–500 ppm with low detection limit of 94 ppb. The response/recovery time to 50 ppm H 2 was 24 s/35 s. The sensor also showed good long-term stability in 28-day response-repeatability measurement (RSD=5.3 %) and good anti-humidity.
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Fan Li,Wenhan Li,Quanxing Zhang,Lianlian Song,Dongpei Zhang,Yuanyuan Ren,Honghong Shi,Wenjuan Yan,Xin Jin,Chaohe Yang
Glutaric acid is an important C5 platform compound in the polyester industry. However, catalytic synthesis of glutaric acid from biomass still remains largely unexplored in this field. We reported in this work a bimetallic PtAu/TiO2 catalyst for the facile liquid-phase oxidation of bioderived 1,5-pentanediol to glutaric acid, with a remarkable yield of 87% at 80 °C and 1 MPa O2. It is found that the Pt/TiO2 catalyst displays weak π-donation with a C═O bond, with 5-hydroxypentanal as the dominant product during primary oxidation. However, doping Au into Pt/TiO2 elevates the energy level of dx2–y2 orbitals at Pt sites and promotes the generation of •OH radicals. As a result, fast secondary oxidation reactions were achieved toward the formation of glutaric acid as the target product. The mechanistic information revealed in this work is useful in designing synergistic catalysts for the liquid-phase synthesis of various other biodicarboxylic acids in a base-free medium.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Lu Wei,Jiayin Guo,Wanwan Wu,Panyan Chen,Heng Bian,Weiwei Li,Xinsheng Zhao
High-entropy doping of multicomponent alloy nanocrystals enclosed by high-index facets (HIFs) is a great challenge due to the high surface energy from HIFs and their distinct standard reduction potential and atom sizes between different metals. Herein, a novel non-aqueous system, choline chloride-urea-based deep eutectic solvent, is proposed as a versatile medium to design a high-entropy rare-earth-doped Pt alloy PtYLaNdSmEuGdTbDyHoEr (HERED-Pt) concave nanocube with HIFs by the electrochemical method. Thanks to the high-index faceted characteristics and the high-entropy rare-earth-doped elemental synergy, the as-synthesized HERED-Pt concave nanocubes exhibit remarkable electrocatalytic performance for hydrazine oxidation reaction (HzOR) with high current density (170.58 mA cm −2 ) and low on-set potential of 369.2 mV, which is superior than the quinary rare-earth-doped Pt alloy PtNdSmGdTbDy (QRED-Pt), single rare-earth-doped Pt alloys (PtY, PtLa, PtNd, PtSm, PtEu, PtGd, PtTb, PtDy, PtHo, PtEr), monometallic Pt concave nanocubes and commercial Pt/C catalyst, representing a state-of-the-art electrocatalyst for HzOR. Density functional theory (DFT) calculations reveal that the HERED-Pt(510) stepped plane can effectively reduce the energy barrier and exhibits higher electrocatalytic performance than that of QRED-Pt(510), single rare-earth-doped PtTb(510), and monometallic Pt(510) stepped planes for HzOR. This study provides a feasible high-entropy doping strategy to effectively achieve a highly efficient electrocatalyst for HzOR.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Lijuan Zhu,Zhongjie Lai,Jilong Xu,Peiyu Ma,Jiaxiang Lu,Qian Xu,Yitao Lin,Lei Zheng,Lihui Wu,Honghe Ding,Jiawei Ge,Yifan Ye
The metal–support interaction of heterogeneous catalysts has garnered significant attention due to its role in boosting electrocatalytic efficiency. Herein, we synthesized uniformly dispersed Pt nanoparticles decorated on a MoOx support by an ultrafast flash joule heating method. This method enables the simultaneous loading of metal and modification of support structures in a controllable, ultrafast manner. The optimal catalyst demonstrates exceptional performance in the hydrogen evolution reaction (HER) under acidic conditions, characterized by a low overpotential of only 55.08 mV to achieve a current density of 100 mA cm−2, a Tafel slope of 19.94 mV dec−1, and a significant mass activity of 13.80 A mgPt−1 at 50 mV vs. RHE. In addition, the optimal catalyst exhibits better stability for the HER than a commercial 20 wt% Pt/C catalyst. The spectroscopic characterization confirms the charge transfer between the metal and support, leading to a near-zero valence state of Pt in the optimal catalyst. Density functional theory calculations further corroborate that the metal–support interaction between Pt and MoOx leads to a suitable hydrogen adsorption free energy at the interfacial Pt site, which results in accelerating the reaction kinetics of the HER. This work aims to design and develop a metal–support heterostructure with high HER activity and stability, and provides a strategy for engineering crystalline structures and electronic configurations using an ultrafast flash Joule heating synthesis method.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Qiuyu Wang,Xingyu Huo,Jun Wang,Huanyu Chen,Ziwen Wang,Zhe Yin,Binglin Tang,Guoping Yu,Bo Lv
With the escalating energy crisis, clean and renewable hydrogen energy has emerged as a focal point of research. This study utilizes titanium concentrate as the primary raw material and employed a more convenient and efficient mechanical activation-oxidation-reduction-acid leaching process to effectively enrich TiO 2 , thereby producing a highly active and stable TiO 2 photocatalyst substrate. To further enhanced its photocatalytic performance, this research developed a heterostructured mineral-derived material g-C 3 N 4 /TiO 2 -6/Pt. Experimental results indicated that the hydrogen evolution rate of the g-C 3 N 4 /TiO 2 -6/Pt composite material reached 6.42 mmol/g/h within 5 h, whereas that of g-C 3 N 4 /P25/Pt was only 5.92 mmol/g/h. This study underscores the significance of extracting TiO 2 from titanium concentrate and its subsequent applications. By effectively utilizing titanium resources, it aims to address the increasing industrial demand for TiO 2 while providing innovative solutions to combat environmental pollution and mitigate the energy crisis. These findings hold substantial theoretical and practical implications for advancing related fields.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Eryu Wang,Yi-Chun Chu,Wenjun Zhang,Yanping Wei,Chuanling Si,Regina Palkovits,Xin-Ping Wu,Zupeng Chen
The co-production of hydrogen and value-added biochemicals from lignocellulose utilizing solar energy has been regarded as one of the technologies most potentially able to alleviate the current energy crisis. Here, we demonstrate a cost-effective photoreforming strategy for lignocellulose valorization using a carbon nitride-supported platinum single-atom photocatalyst. An advanced H 2 evolution rate of 6.34 mmol mol Pt –1 h –1 is achieved over the optimal catalyst, which is around 4.6 and 30.5 times higher compared with the nanosized Pt counterpart and pristine carbon nitride, respectively. Meanwhile, the monosaccharides are oxidized to value-added lactic acid with >99% conversion and extraordinary selectivity up to 97%. The theoretical calculations show that with Pt incorporation, the photogenerated holes are predominantly localized on the metal sites while the photogenerated electrons are concentrated on C 3 N 4 , thus enhancing the effective separation of charge carriers. This work provides a promising avenue for the simultaneous production of green H 2 and bio-based chemicals by biomass photorefinery.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Fan Li,Lianlian Song,Quanxing Zhang,Caoying Kang,Wenhan Li,Chuanqin Ding,Mengyuan Liu,Feng Du,Lin He,Kunming Zhang,Wenjuan Yan,Xin Jin,Chaohe Yang
Aqueous oxidation of 1,5-pentanediol (1,5-PDO), a furfural-based intermediate, presents a sustainable pathway to synthesize glutaric acid (GA) for polyester industry. Kinetic analysis and mechanistic modeling for this reaction is indispensable for catalyst optimization and process scale-up. In this work, power law and modified Langmuir-Hinshelwood kinetic study confirmed a unique 2nd order kinetics on aqueous oxidation of 1,5-PDO over Pt-based catalysts. Notably, bimetallic PtAu/TiO 2 catalysts exhibited superior selectivity toward target carboxylic acids (5-hydroxyvaleric acid and GA) by facilitating oxidation of –CHO group in the key intermediate 5-hydroxypentanal compared to monometallic Pt/TiO 2 catalyst. Furthermore, a preliminary technoeconomic comparison with the fossil-based synthetic route was evaluated to highlight the advantage of bio-GA studied in this work. The outcome of kinetic modeling would provide useful information for optimizing cost-effective catalysts and process design in producing bio-derived dicarboxylic acids.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）