JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Jinjin Lin,Tao Sun,Minbo Li,Jinxiang Yang,Jinni Shen,Zizhong Zhang,Ying Wang,Xiaoyan Zhang,Xuxu Wang
Loading noble metal on the surface has been widely used to improve photocatalytic activity of semiconductor photocatalyst. Here, Pt-embedded anatase (A)-rutile (R) TiO 2 junction photocatalyst (A/Pt/R) was found to show much more efficient photocatalytic H 2 evolution activity than the other TiO 2 photocatalysts loading Pt on the outside surface (such as Pt/A/R, Pt/A, Pt/R and Pt/P25), although the as-embedded Pt is unreachable to reactants. The A/Pt/R sample shows a photocatalytic H 2 evolution rate as high as 17.9 mmol⋅g cat −1 ⋅h −1 , which is 27.2 and 2.5 times higher than the common A/R and Pt/A/R samples, respectively. The traditional theory fails to explain the unexpected high photoactivity. The reverse tandem Schottky junction is suggested to be possibly responsible for the high photoactivity of A/Pt/R, which allows the photogenerated electrons to transfer more swimmingly from rutile to anatase than the common A/R phasejunction. This finding provides a new strategy for further promoting photocatalytic activity of Pt/TiO 2 and other heterophase or heterojunction photocatalysts.
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SOLAR ENERGY
·
2015
·
IF 3.469
Min Zheng,Jinghao Huo,Binguo Chen,Yongguang Tu,Jihuai Wu,Linhua Hu,Songyuan Dai
Binary alloy platinum–cobalt (Pt–Co) and platinum–nickel (Pt–Ni) hollow nanospheres are prepared by using a simple solution reaction method. Poly(3,4-ethylenedioxy thiophene):polystyrene sulfonate (PEDOT:PSS) as supported layer further enhance the binary platinum alloy electrochemical properties. The prepared binary platinum alloys are observed with hollow nanosphere structure. The cyclic voltammogram and electrochemical impedance spectroscopy measurement indicate that Pt–Co and Pt–Ni hollow nanospheres on PEDOT:PSS (PC-PP and PN-PP) electrodes have high conductivity and catalytic performance. Under simulated white solar light irradiation with intensity of 100 mW cm −2 (AM 1.5), the dye-sensitized solar cells (DSSCs) based on PCPP and PNPP counter electrodes achieve power conversion efficiencies of 9.02% and 8.23%, respectively, which are higher than the efficiency for the DSSC based on Pt counter electrode (7.96%).
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Journal of Advanced Dielectrics
·
2022
·
IF 0
Xudong Qi,Kai Li,Lang Bian,Enwei Sun,Limei Zheng,Rui Zhang
Relaxor-based ternary Pb( In 1 / 2 Nb 1 / 2 )O 3 –Pb( Mg 1 / 3 Nb 2 / 3 )O 3 –PbTiO 3 (PIN–PMN–PT) single crystals and ceramics are promising candidates for high-performance electromechanical conversion devices. It is known that the domain structure and dielectric diffusion–relaxation characteristics are crucial to the excellent performances of relaxor ferroelectrics. In this work, we prepared the PIN–PMN–PT ceramics with various PIN/PMN proportions and systematically investigated their domain structure and dielectric diffusion–relaxation properties. The effect of PIN/PMN proportion on the domain size and dielectric diffusion–relaxation characteristics was also studied. The investigations showed that PIN–PMN–PT ceramics presented multi-type domain patterns comprising irregular island domains and regular lamellar domains. Moreover, the dependent relations of PIN/PMN proportions on the dielectric diffusion and domain size indicated that the PIN composition has a stronger lattice distortion than PMN composition; increasing the PIN proportion can enhance the dielectric diffusion and decrease the domain size. Our results could deepen the understanding of structure–property relationships of multicomponent relaxor ferroelectrics and guide the design and exploration of new high-performance ferroelectric materials.
研究领域:
材料科学
·
凝聚态物理
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Yong Pan,Xiangyang Luan,Yue Jing,Yu Jiang,Li Ding
Hydrogenation reaction is a highly dangerous yet widely applied chemical process. Monitoring hydrogen leakage during this reaction is essential to ensure industrial safety. To address this need, a highly sensitive hydrogen sensor has been developed based on Pt sensitized ZnO microsphere as sensing materials, which was prepared by annealing-assisted one-pot solvothermal method. Compared with the previously reported work, this strategy enables the controlled synthesis of uniform and monodisperse ZnO microspheres, ensuring highly controllable and reproducible precious metal loading, which is conducive to large-scale production. Thanks to higher oxygen vacancy concentrations, enhanced mesopore volume fractions, and a larger specific surface area, the 1 at% Pt-ZnO sensor at an annealing temperature of 500 °C demonstrates excellent hydrogen detection performance, including a higher response value (1,480,000), a lower detection limit (100 ppb), outstanding selectivity (response to interfering gases <1%), and good short-term repeatability (relative standard deviation of 6.98% over 8 cycles). Furthermore, the sensor has also been applied in the hydrogenation process of 2,4-dinitrotoluene for hydrogen leak monitoring, effectively detecting hydrogen leaks at concentrations of 30-40 ppm, confirming its potential for leak detection in typical hydrogenation reaction.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Da Meng,Shendan Zhang,Tiju Thomas,Chaozhu Huang,Jingwei Zhao,Ruiyang Zhao,Ying Shi,Fengdong Qu,Minghui Yang
Methanol detection is known to be a challenge using the normal Pt/C based gas sensor. This is primarily due to CO poisoning of the Pt active sites, resulting in an irreversible loss of sensor performance. In this paper, a novel fuel cell type gas sensor based on platinized mesoporous tungsten nitride (Pt/WN) is fabricated by employing a hot-press method. The device shows considerable performance for methanol detection at room temperature without external potential applied. The mesoporous WN is prepared through a simple solid-state method with subsequent ammonolysis . An ethylene glycol reduction method is applied to load Pt nanoparticles on WN or on carbon blacks. Results show that Pt/WN gas sensor has the sensitivity of 0.037 μA/ppm, which is four times higher than that of the Pt/C counterpart. In addition, replacing carbon with WN will increase the response to to methanol with excellent selectivity and stability. The synergistic effect between WN and Pt may play an important role. This investigation shows the potential of tungsten metal nitride in the gas sensor device reported; this offers a new way to change the selectivity of gas sensors using suitably chosen support materials.
研究领域:
材料科学
·
化学工程
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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.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Denghui Jiang,Feng Luo,Yuanshui Liu,Kao Pei,Linzhuang Xing,Zhimin Li
Low strain limits the further application of Pb(Zr,Ti)O 3 (PZT) piezoelectric ceramics in actuators. Herein, a ternary piezoelectric ceramic x PbTiO 3 -(0.95- x )PbZrO 3 -0.05(Bi 0.5 Na 0.5 )TiO 3 ( x PT-PZ-BNT) is proposed and prepared by solid-state method to improve the strain characteristics. Results indicate that a biased electric field is intentionally constructed by defects arising from the incorporation of BNT into PZ-PT ceramic, which promotes non-180° domains to restore to initial states, thereby contributing to the increase in strain. Moreover, the electric domain configuration is efficiently modified by adjusting the component proportion in x PT-PZ-BNT ceramics, in which the 0.42 PT-PZ-BNT presents short and broad domains with fast response to external electric field. Rayleigh analysis indicates that the strain contributed by domain switching is dominant in PT-PZ-BNT ceramics under a high electric field. Consequently, a large strain of 0.4% is achieved in 0.42 PT-PZ-BNT ceramic with the variation less than 10% in the temperature range of 25∼175 °C. This study not only deeply analyzes the effect of domain configuration on the strain for PZT piezoelectric ceramics, but also demonstrates an effective approach to increase the strain through constructing internal biased electric field and regulating domain configuration.
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Materials
·
2014
·Vol. 7
·期 12
·8105-8130
·
IF 1.879
Xiaoshuang Qian,Hongmei Qin,Tao Meng,Yi Lin,Zhen Ma
Oxides (such as SiO2, TiO2, ZrO2, Al2O3, Fe2O3, CeO2) have often been used to prepare supported Pt catalysts for CO oxidation and other reactions, whereas metal phosphate-supported Pt catalysts for CO oxidation were rarely reported. Metal phosphates are a family of metal salts with high thermal stability and acid-base properties. Hydroxyapatite (Ca10(PO4)6(OH)2, denoted as Ca-P-O here) also has rich hydroxyls. Here we report a series of metal phosphate-supported Pt (Pt/M-P-O, M = Mg, Al, Ca, Fe, Co, Zn, La) catalysts for CO oxidation. Pt/Ca-P-O shows the highest activity. Relevant characterization was conducted using N2adsorption-desorption, inductively coupled plasma (ICP) atomic emission spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM), CO2temperature-programmed desorption (CO2-TPD), X-ray photoelectron spectroscopy (XPS), and H2temperature-programmed reduction (H2-TPR). This work furnishes a new catalyst system for CO oxidation and other possible reactions.Keywords:metal phosphate;hydroxyapatite;Pt catalyst;CO oxidation
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 22
·8803-8811
·
IF 8.262
Tao Fu,Jun Fang,Chunsheng Wang,Jinbao Zhao
Aiming to reduce the dosage of the noble metal Pt and improve the catalytic activity of the catalyst in fuel cells, hollow porous Ag–Pt alloy nanoparticles with Pt coating are prepared via a facile controlled galvanic replacement reaction. Ag is used as the substrate to build a hollow porous structure and alloyed with Pt to minimize the tensile effect of the Ag on the deposited Pt skin which would significantly lower the catalytic performance of the Ag–Pt bimetallic catalyst. This hollow porous Ag/Pt bimetallic catalyst exhibits a long catalytic durability and a mass activity of 0.438 A mgPt−1 at 0.9 V (vs. RHE) towards the oxygen reduction reaction (ORR), which is ca. 3 times higher than that of the commercial Pt/C catalyst. The significant enhancement over the state-of-the-art Pt catalysts can be attributed to (1) the high surface area of the nanoparticles, (2) the more suitable d-band center of the Pt skin deposited on the Ag–Pt alloy substrate, and (3) the high thermal stability of the Ag–Pt alloy. Therefore, this work provides a new strategy for designing high-performance catalysts with low cost. In addition, the synthetic chemistry involved can possibly be extended for fabricating versatile catalysts with a similar structure.
研究领域:
材料科学
·
电化学
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高影响因子
Nano Research
·
2016
·Vol. 10
·期 1
·238-246
·
IF 8.893
Wang Changhong,Hu Feng,Yang Hongchao,Zhang Yejun,Lu Huan,Wang Qiangbin
Cost-effective electrocatalysts for the hydrogen evolution reaction (HER) play a key role in the field of renewable energy. Although tremendous efforts have been devoted to the search of alternative materials, Pt/C is still the most efficient electrocatalyst for the HER. Nevertheless, decreasing the loading of Pt in the designed eletrocatalysts is of significance. However, with low Pt loading, it is challenging to maintain excellent catalytic performance. Herein, a new catalyst (Pt/NPC) was prepared by dispersing Pt nanoparticles (PtNPs) with an average diameter of 1.8 nm over a three-dimensional (3D) carbon network co-doped with N and P. Because of the high electronegativity of the N and P dopants, PtNPs were uniformly dispersed on the carbon network via high electronic affinity between Pt and carbon, affording a Pt/NPC catalyst; Pt/NPC exhibited superior HER activity, attributed to the down-shift of the Pt d-band caused by the donation of charge from N and P to Pt. The results show that Pt/NPC with an ultralow Pt loading of 1.82 wt.% exhibits excellent HER performance, which corresponds to a HER mass activity 20.6-fold greater than that observed for commercial 20% Pt/C at an overpotential of 20 mV vs. RHE.
研究领域:
材料科学
·
可再生能源
·
电化学
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高影响因子
Small
·
2025
·
IF 12.1
Zi-Ye Liu,Jiu-Jiu Ge,Lei Yu,Sian-Hong Ong,Lian-Jian Zhang,Ji-Ming Hu
Efficient and durable alkaline water electrolysis at industrial current densities remains a key challenge due to sluggish oxygen evolution kinetics and poor stability of hydrogen evolution reaction (HER) catalysts in alkaline media. Herein, a unique Pt–Ni/Fe coordinated single-atom Pt catalyst anchored on nickel-iron layered double hydroxide (ePt/NiFe LDH), is reported synthesized via a facile electrodeposition process within 30 min. Unlike the conventional Pt-O-M (metal) coordination, the newly discovered Pt–Ni/Fe bonding structure significantly modulates the electronic structure of the NiFe active sites, thereby synergistically enhancing both HER and OER activities. Benefiting from this optimized coordination environment and the nanoflower architecture, the ePt/NiFe LDH@e-nf electrode delivers outstanding overall water splitting performance, achieving a low cell voltage of 1.42 V at 10 mA cm −2 and 1.54 V at 100 mA cm −2 without iR compensation. More importantly, it maintains ultrastable operation over 1440 h at an industrial-level current density of 500 mA cm −2 , outperforming commercial Pt/C–RuO₂ benchmarks. This work demonstrates a promising strategy for designing high-performance and durable single-atom catalysts for practical alkaline water electrolysis applications.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yingzhang Shi,Taikang Wu,Zhiwen Wang,Cheng Liu,Jinhong Bi,Ling Wu
Optimizing the electronic structure of the surface active sites and introducing functional sites for a photocatalyst are effective strategies to achieve the photocatalytic selective hydrogenation of biomass. Herein, Pt clusters/bimetallic NiMg-MOF-74 (MNM) ultrathin nanosheets were constructed for the photocatalytic precise hydrogenation of furfural (FUR) to furfuryl alcohol (FAL). A representative sample (Pt/MNM-0.25) shows 99.9% conversion of FUR and 99.9% selectivity of FAL. The electron density of surface coordinatively unsaturated Ni II atoms in MNM is decreased after the doping of Mg. In situ ATR-IR indicated that the optimized surface Ni II sites induced a more effective coordination activation of FUR molecules via the Ni-η 1 -(O)-furfural coordination. Electrochemical measurements and in situ EPR results reveal that Pt clusters are the functional surface sites for transferring the photogenerated electrons and dissociating H 2 . The synergistic effect of surface optimized Ni II sites and Pt clusters is emphasized. This work successfully achieves the high-efficiency precise hydrogenation of FUR to FAL via designing surface functionalized Pt clusters/bimetallic MOF ultrathin nanosheets.
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