RARE METALS
·
2023
·Vol. 42
·期 5
·1614-1623
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IF 8.8
Liu Shu-Ran,Luo Shu-Ting,Wu Xiao-Dong,Wang Tao-Jin,Ran Rui,Weng Duan,Si Zhi-Chun,Liu Shuang
In this work, silica-alumina mixed oxides with different SiO 2 contents (5% and 30%) were adopted as acidic supports for platinum catalysts for soot oxidation. The obtained catalysts were hydrothermally aged in 10% H 2 O/air at 750 °C for 20 h. The catalysts were characterized by X-ray diffraction (XRD), N 2 adsorption, inductively coupled plasma (ICP), CO chemisorption, NH 3 temperature-programmed desorption (TPD), infrared (IR) spectroscopy of CO adsorption, temperature-programmed oxidation (TPO) of NO, and TPD of NO x . The surface acidity of catalyst was positive correlated with the content of SiO 2 , which kept platinum in metallic and partially oxidized states in an oxidizing atmosphere. Compared with sulfation treatment on the alumina support, the application of SiO 2 –Al 2 O 3 mixed oxides does not result in the coverage of Pt active sites and the prepared catalysts exhibit excellent activity for NO oxidation. They promote NO x preferential adsorption on soot and decomposition of surface oxygenated compounds (SOCs) as the sulfated Pt/Al 2 O 3 catalyst does. Graphical abstract
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2022
·
IF 11.357
Zhenpeng Huang,Jiajia Ding,Xinwei Yang,Hao Liu,Peiyao Song,Yanglong Guo,Yun Guo,Li Wang,Wangcheng Zhan
Pt-based catalysts have attracted widespread attention in environmental protection applications, especially in the catalytic destruction of light alkane pollutants. However, developing a satisfying platinum catalyst with high activity, excellent water-resistance, and practical suitability for hydrocarbon combustion at low temperature is challenging. In this study, the Pt catalyst supported on the selected Nb2O5 oxide exhibited an efficient catalytic activity in propane oxidation and exceeded that of most catalysts reported in the literature. More importantly, the Pt/Nb2O5 catalyst maintained excellent activity and durability even after high-temperature aging at 700 °C and under harsh working conditions, such as a certain degree of moisture, high space velocity, and composite pollutants. The excellent performance of the Pt/Nb2O5 catalyst was attributed to the abundant metallic Pt species stabilized on the surface of Nb2O5, which prompted the C–H bond dissociation ability as the rate-determining step. Furthermore, propane was initially activated via oxidehydrogenation and followed the acrylate species path as a more efficient propane oxidation path on the Pt/Nb2O5 surface. Overall, Pt/Nb2O5 can be considered a promising catalyst for the catalytic oxidation of alkanes from industrial sources and could provide inspiration for designing superb catalysts for the oxidation of light alkanes.
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ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Xiaofang Zhang,Wenhuang Xiao,Shenghui Xie,Gaochao Fan,Xinlin Shi,He Meng,Haipeng Yang
Hydrogen peroxide (H 2 O 2 ) is an important signaling molecule that regulates many biological processes. It is of great value to realize rapid, accurate, highly sensitive and low-cost H 2 O 2 detection in the immediate detection of trace disease markers. Low-density nanoelectrode arrays have a high signal-to-noise ratio and are advantageous for trace detection. In this paper, low-density Pt nanoelectrode arrays were successfully prepared by a simple method of ion sputtering combined with electrodeposition based on a track-etched polycarbonate membrane template. The arrays had a detection limit as low as 0.03 μM for H 2 O 2 at a constant potential, a sensitivity of 125.9 μA mM −1 , and a linear range spanning nearly four orders of magnitude (0.1–655 μM). The developed sarcosine sensors based on these arrays had a very low detection limit (0.08 μM) and wide linear range (0.5–64.5 μM) for the rapid detection of trace amounts of sarcosine in serum. With a wide linear range and low detection limits, this hydrogen peroxide sensing platform has great potential for use in the rapid electrochemical detection of trace substances.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Xing Cheng,Yueshuai Wang,Yue Lu,Lirong Zheng,Shaorui Sun,Hongyi Li,Ge Chen,Jiujun Zhang
Reducing the usage of noble metals, such as platinum-based catalysts for oxygen reduction reaction (ORR) is pressingly demanded towards the practical applications of proton-exchange membrane fuel cells. One promising way is to develop Pt single atom catalysts (SACs), which, however, are plagued by their preference toward two-electron ORR pathway as well as stability issue. Herein, a single-atom alloy (SAA) catalyst with platinum-cobalt (Pt-Co) dual sites encapsulated in nitrogen-doped graphitized carbon nanotubes (Pt 1 Co 100 /N-GCNT) consisting of isolated Pt atoms decorated on the surface of Co nanoparticles was reported. Based on complementary spectroscopic characterizations and first-principle calculations, we propose that the unique Pt-Co dual sites in SAA facilitates the adsorption and dissociation of oxygen, particularly for the immobilization of OOH* intermediate and the dissociation of OH* intermediate, and thus result in high-efficiency four-electron ORR pathway. Consequently, the Pt 1 Co 100 /N-GCNT SAA catalyst achieves a mass activity of 0.81 A mg –1 Pt at 0.90 V (versus the reversible hydrogen electrode) in 0.1 M HClO 4 electrolyte, outperform commercial Pt/C catalyst for 5.4 times. The superior stability of the SAA catalyst was reflected by the results from the 30,000 potential-scanning cycles combined with the post characterization of the catalyst.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
·
IF 24.319
Ya Zhang,Lang Hu,Yongcai Zhang,Xiaozhi Wang,Honggui Wang
Snowflake-like Cu 2 S/MoS 2 heterostructures with varied compositions were constructed via a two-step hydrothermal method. The 45-Cu 2 S/MoS 2 with 45 wt% Cu 2 S was found as the optimum catalyst, which displayed photothermal enhanced hydrogen evolution reaction (HER) performance under near infrared (NIR) irradiation. After electrochemical deposition of a tiny amount of Pt (45-Cu 2 S/MoS 2 /Pt-100s), Schottky barrier was formed between Pt nanoparticles and MoS 2 nanosheets . Using 45-Cu 2 S/MoS 2 /Pt-100s as an electrocatalyst, low overpotential of 78 mV (@10 mV cm −2 ) and Tafel slope of 48 mV dec −1 were achieved with the assistance of NIR irradiation. The photoelectrochemical (PEC) hydrogen production performance of 45-Cu 2 S/MoS 2 /Pt-100s was also investigated. The optimal conversion efficiency of 45-Cu 2 S/MoS 2 /Pt-100s could reach 0.78% at 0.57 V (vs. reversible hydrogen electrode (RHE)). The control of the internal geometric and electronic structure of the catalysts and the aid of photothermal effect in this work provide new ideas for designing high-efficiency hydrogen evolution catalysts.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Qian Ningkang,Ji Liang,Li Xiao,Huang Jingbo,Li Junjie,Wu Xingqiao,Yang Deren,Zhang Hui
Combining the core-shell structure with the optimization of surface composition and structure in the shell is a fantastic strategy to enhance the electrocatalytic performances. Here, we synthesized trimetallic Au@PtxSny core-shell nanoparticles (NPs) with tunable composition and structure of Pt-Sn alloyed shells. Impressively, the Au@PtSn core-shell NPs with hexagonal PtSn alloyed shells exhibited the highest mass activity and specific activity toward ethanol oxidation reaction (EOR) in alkaline electrolyte, which are 13.0 and 12.7 times higher than those of the commercial Pt/C. In addition, the Au@PtSn core-shell NPs displayed the best stability compared to commercial Pt/C, with only 44.8% loss vs. 86.8% loss in mass activity after 1,000 s due to the stronger anti-poisoning ability for reaction intermediates. The theory calculations reveal that the introduction of Au core and alloying Pt with Sn both endow Pt with an appropriate d-band center, and thus effectively boosting the EOR activity.
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Lulu Guo,Mengmeng Liu,Xuguang Zhang,Taotao Sui
The development of feasible and facile method to construct oxygen vacancies on metal oxides is crucial for improving their gas sensing properties. In this work, we developed a highly sensitive and stable CO gas sensor based on metal-organic frameworks (MOFs) template-derived Pt nanoparticles (NPs)-functionalized CeO 2 nanorods (Pt-CeO 2 ) with abundant oxygen vacancies through facile solvothermal method. The obtained Pt-CeO 2 -based sensors exhibit good thermal stability and superior CO sensing performance with high response value of 47.7% towards 500 ppm CO at 300 °C, which is higher than that of the pristine CeO 2 sensor (17.8%). Moreover, Pt-CeO 2 -based sensor exhibits excellent selectivity, rapid response/recovery speed (9/11 s) and remarkable long-term stability toward CO. Finally, the enhanced CO sensing mechanism is proposed through a combination of experiments and characterizations, which is attributed to porous structure, abundant oxygen vacancies and electron sensitization effect of Pt NPs. This work not only provides unique insights into the facile design of metal oxide-based nanomaterials with abundant oxygen vacancies, but also has great application potential in building sensing systems for fast CO detection.
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Nanomaterials
·
2022
·Vol. 12
·期 15
·2550
·
IF 5.719
Yuqian Yu,Li Kang,Lixian Sun,Fen Xu,Hongge Pan,Zhen Sang,Chenchen Zhang,Xinlei Jia,Qingli Sui,Yiting Bu,Dan Cai,Yongpeng Xia,Kexiang Zhang,Bin Li
Sodium borohydride (NaBH4), with a high theoretical hydrogen content (10.8 wt%) and safe characteristics, has been widely employed to produce hydrogen based on hydrolysis reactions. In this work, a porous titanium oxide cage (PTOC) has been synthesized by a one-step hydrothermal method using NH2-MIL-125 as the template and L-alanine as the coordination agent. Due to the evenly distributed PtNi alloy particles with more catalytically active sites, and the synergistic effect between the PTOC and PtNi alloy particles, the PtNi/PTOC catalyst presents a high hydrogen generation rate (10,164.3 mL∙min−1∙g−1) and low activation energy (28.7 kJ∙mol−1). Furthermore, the robust porous structure of PTOC effectively suppresses the agglomeration issue; thus, the PtNi/PTOC catalyst retains 87.8% of the initial catalytic activity after eight cycles. These results indicate that the PtNi/PTOC catalyst has broad applications for the hydrolysis of borohydride.Keywords:hydrogen generation;porous titanium oxide cage;PtNi nanoparticles;sodium borohydride hydrolysis
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Tianle Shi,Yong Men,Shuang Liu,Jinguo Wang,Zhuping Li,Keye Qin,Dandan Tian,Wei An,Xiaoli Pan,Lin Li
Hydrogenation of CO 2 to methanol is an achievable way for “methanol economy” and “liquid sunshine” visions. Owing to highly tunable properties containing different morphologies, exposed crystal facets and oxygen vacancies , In 2 O 3 has become a promising material for CO 2 hydrogenation. Here we successfully introduced highly dispersed Pt 2+ species into three different morphologies In 2 O 3 supports by controllable precipitation method. The dominant exposed crystal facets of In 2 O 3 supports during the research are discovered to greatly affect the dispersion of active Pt 2+ species and the number of oxygen vacancies, as analyzed by diverse characterization techniques, and closely correlated with the catalytic performance. Compared with Pt/In 2 O 3 whcih mainly exposing (222) or (104) facet, Pt/In 2 O 3 which primarily exposed (211) facet obtained higher catalytic activity, including a CO 2 conversion of 11.7% and methanol selectivity of 74.8% with a space time yield of methanol of 0.63 g MeOH h −1 gcat −1 at 300 °C, 5 MPa, and 21,000 cm 3 h −1 g −1 . The highly enhanced activity of 1.5Pt/C-In 2 O 3 -S catalyst was ascribed to its more abundant oxygen vacancies and well-dispersed Pt 2+ species, which derived from the interaction between Pt 2+ and the underlying In 2 O 3 (211) facet. The special interface structure enabled the activation of CO 2 and hydrogenation of key intermediates effectively. Exposing the highly active crystal face of the In 2 O 3 supports is proved to be an effective strategy to enhance catalytic performance of Pt/In 2 O 3 catalyst for methanol synthesis .
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Kailin Wang,Songyu Yang,Yan Wu
Dual cocatalysts play an important role in photocatalytic water splitting to hydrogen production . In this paper, Fe-doped Co 3 O 4 (Fe-Co 3 O 4 ) and Pt were loaded on the surface of g -C 3 N 4 to enhance the water photocatalytic splitting, in which Fe-Co 3 O 4 was used as an oxidation cocatalyst to capture the photo-generated holes of g -C 3 N 4 , and Pt was used as a reduction cocatalyst to transfer photo-generated electrons. Under the irradiation of visible light, its hydrogen production rate reaches up to 3.015 mmol g −1 h −1 , which is 3.01 times higher than that of g -C 3 N 4 loaded with Pt. Pt and Fe-Co 3 O 4 dual cocatalysts not only promote the migration rate of photo-generated electrons and holes on the surface of g -C 3 N 4 , but also improve the light absorption capacity of visible light. The interfacial electric field built from the p-n heterojunction of Fe-Co 3 O 4 / g -C 3 N 4 drives photo-generated electrons in Fe-Co 3 O 4 flowing to the holes of g -C 3 N 4 , which further inhibiting the recombination of g -C 3 N 4 photo-generated carriers. This work provides a reference for the development of high-efficiency photocatalyst and an effective support for the development of semiconductor cocatalyst.
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Foods
·
2022
·Vol. 11
·期 18
·2900
·
IF 5.561
Biao Zhang,Ruofan Zhou,Huiqi Zhang,Danfeng Cai,Xiaodong Lin,Yihan Lang,Yulou Qiu,Xuping Shentu,Zihong Ye,Xiaoping Yu
A smartphone colorimetric sensor based on the Pt@Au nanozyme was successfully developed for the visual and quantitative detection of omethoate in fruit and vegetables. The anti-omethoate antibody was conjugated on the surface of the Pt@Au nanozyme as a catalytic functional signal probe, and coating antigen conjugated on the surface of magnetic polystyrene microspheres (MPMs) was used as a separation capture probe. In the sensing system, when the catalytic functional signal probe was combined with a separation capture probe containing no omethoate, the visible blue color appeared with the addition of tetramethylbenzidine (TMB) chromogenic solution, and the maximum B value of the sensing system was obtained via the smartphone. With increasing concentrations of omethoate, the visualization of the sensing system decreased, and the B-value obtained via the smartphone dropped. Under optimal detection conditions, the omethoate could be detected in a linear range of 0.5–50 μg/L (R2= 0.9965), with a detection limit of 0.01 μg/L. The accuracy and reliability of the detection results of this colorimetric sensor were successfully confirmed by enzyme linked immunosorbent assay (ELISA) and gas chromatography. This colorimetric sensor provides a technical reference and potential strategy for the immunoassay of hazard factors in resource-scarce laboratories.Keywords:colorimetric sensor;Pt@Au nanozyme;visualized biosensing;smartphone-based quantitative detection;omethoate
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Yujia Yuan,Zhongliang Huang,Siyuan Hu,Dongren Cai,Guowu Zhan
In the field of catalysis, nanoreactors with spatially restricted effects play a critical role to enhance the production efficiency of a variety of reactions. In this contribution, we used ZIF-67 nanocubes (size of 140 nm) as a template and conformally deposited Al2O3 thin films by the atomic layer deposition (ALD) technique, wherein Pt nanoparticles (Pt NPs) as active sites were loaded on either the inside or outside of the Al2O3 films. Notably, it was found that the water treatment of the nanoreactors was critical to the enhanced catalytic CO oxidation performance with substantially decreased T100 (temperature to achieve 100% conversion). Various characterization results indicated the successful synthesis of yolk–shell structured ZIF-67/Pt@10Al2O3-W catalyst with excellent CO oxidation activity and good long-term stability. In addition, in situ diffuse reflectance infrared Fourier transform spectroscopy was used to explore the catalytic oxidation process, and the results revealed that the reason for the superior CO catalytic activity of the designed nanoreactors was ascribed to the moderate CO surface coverage provided by the Al2O3 films and the activated oxygen species. In summary, this work provides some insights into the preparation of metal–organic framework-based nanoreactors using ALD-assisted methods.
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