RSC Advances
·
2018
·Vol. 8
·期 63
·36353-36359
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IF 2.936
Cuiping Zhai,Shenshen Li,Jianhong Wang,Yong Liu
A simple method for the preparation of porous nitrogen-doped carbon spheres (MNCS) with honeycomb-like structures through the self-assembly of colloidal silica by using polyaniline as the nitrogen source and a carbon precursor is reported. The BET surface area calculated from N2 adsorption/desorption measurement of the MNCS is up to 882 m2 g−1. The synthesized MNCS were employed as a support for Pt nanoparticles for the oxidation of methanol and ethanol in alkaline media. Compared to Pt supported on commercial Vulcan XC-72R carbon (Pt/C), Pt/MNCS exhibit higher electro-catalytic performance and greater stability, indicating that MNCS have potential application prospects as electro-catalyst supports for alcohol oxidation in alkaline media. This enhancement in performance is due to the honeycomb-like porous structure of the MNCS and the doping with nitrogen.
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APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Qi Lian,Han Liu,Xuefang Zheng,Xiaoming Li,Fengjie Zhang,Jing Gao
A general method for the preparation of Pt doped CuO/Pt nanoflowers (CuO/Pt NFs) for peroxidase mimicking has been demonstrated via hydrothermal method . Pt ions could be reduced to Pt nanoparticles by using the ascorbic acid (AA) as reducing agent and Pt ions were uniformly doped in the CuO nanoflowers by using the bovine serum albumin (BSA) as the stabilizer . The obtained CuO/Pt NFs exhibited a higher peroxidase-like catalytic activity than individual CuO and Pt nanoparticles alone, which could be ascribed to their synergistic effect. In the presence of hydrogen peroxide (H 2 O 2 ), the CuO/Pt NFs could catalyze the oxidation of chromogen 3,3′,5,5′-tetramethylbenzidine (TMB) to a blue color product. The peroxidase activity of CuO/Pt NFs was selectively inhibited by Hg 2+ due to form the CuO/Pt-Hg trimetallic amalgam . However, the inhibition was not affected by other metal ions . Therefore, a novel colorimetric biosensor was developed for sensitive detection of mercuric ions by using CuO/Pt NFs. This method exhibited a wide response linear range, low limit of quantification values, excellent sensitivity and selectivity for detection of Hg 2+ in various ground water samples, which was verified with CVAAS. With the advantages of rapid response, simple operation, naked-eye observation and low cost, the colorimetric CuO/Pt NFs sensor showed bright prospects for detection of Hg 2+ in various water samples and public drinking water distribution systems .
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Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 16
·9791-9797
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IF 10.733
Kai Deng,You Xu,Dandan Yang,Xiaoqian Qian,Zechuan Dai,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
The structure- and composition-controlled synthesis of Pt-based nanocatalysts is highly important for improving their catalytic performance while reducing the overall use of precious Pt. Here, an effective strategy is developed to combine surface porosity, hollow cavities and metal–nonmetal incorporation engineering on Pt, resulting in ternary Pt–Ni–P mesoporous nanocages (Pt–Ni–P MNCs). Owing to the mesoporous surface, hollow structure and synergistic electronic effects derived from Pt, Ni, and P elements, the as-prepared Pt–Ni–P MNCs exhibit excellent electrocatalytic activity and long-term stability for both the oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR), enabling them to be promising ORR–MOR bifunctional electrocatalysts for direct methanol fuel cells.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Rong Dai,Ziliang Zheng,Wenjun Yan,Chenshuai Lian,Xu Wu,Xia An,Xianmei Xie
The critical problem facing catalysts for the LT-ESR is deactivation owing to sintering of the active metal and carbon deposition. To solve this problem, a dragon fruit-like Pt-Cu@mSiO 2 catalyst for LT-ESR reaction has been successfully fabricated by a facile encapsulation strategy. Structural and morphological analysis shows that the Pt-Cu@mSiO 2 nanocomposite (approximately 400 nm) has a uniform dragon fruit-like structure, with well crystallized Pt-Cu alloy nanoparticles (about 50 nm) embedded in the mSiO 2 . Benefiting from the unique components and architectural features, the dragon fruit-like Pt-Cu@mSiO 2 nanocomposite with optimal Pt/Cu ratio present superior performance than that of Pt@mSiO 2 , Cu@mSiO 2 and supported Pt-Cu/mSiO 2 catalysts in terms of activity, H 2 selectivity, and stability in the LT-ESR reaction. Moreover, the synergistic effect of platinum and copper can substantially decrease the CO concentration. It is crucial that the mesoporous SiO 2 shell not only make the embedded Pt-Cu alloy nanoparticles easily accessible but also effectively prevent leaching and aggregation of active sites as well as spatially suppress the carbon deposition on the active surface, thus maintain a good catalytic activity during the 150 h stability test at 400 °C.
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BIOSENSORS & BIOELECTRONICS
·
2017
·
IF 7.78
Jingyi Luo,Danfeng Jiang,Tao Liu,Jingmeng Peng,Zhenyu Chu,Wanqin Jin
In this work, a novel sandwich-type aptasensor was designed for the ultrasensitive recognition of trace mercury ions in water. Numerous oriented platinum nanotube arrays (PtNAs) were in-situ crystallized on a flexible electrode as a sensing interface, while thionine labelled Fe 3 O 4 /rGO nanocomposites as signal amplifiers. Both PtNAs/CF and nanocomposites were synthesized by easy hydrothermal processes. With their large surface area, it was favorable for electrochemical performance and immobilization of capture DNAs (cDNA) and report DNAs (rDNA). Upon the existence of Hg 2+ , partial linker DNAs were tightly bound with cDNAs through thymine-Hg 2+ -thymine pairing (T-Hg 2+ -T). Then rDNAs attached Fe 3 O 4 /rGO nanoprobes were fixed on the electrode through the match of remaining linker DNAs and rDNAs. Under the optimal conditions, the Hg 2+ aptasensor showed a synergistic amplification performance with a wide linear range from 0.1nM to 100 nM, as well as a low detection limit of 30 pM. Moreover, the as-prepared aptasensor also exhibited reliable performance for assay in real lake water samples.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 22
·期 3
·817-824
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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.
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Catalysts
·
2024
·Vol. 14
·期 10
·724
·
IF 3.8
Nannan Zhan,Yan Xiao,Xingkun Chen,Yuan Tan,Yunjie Ding
In this study, carbon materials with different dimensions, including the typical one-dimensional (1D) carbon nanotube (CNT), two-dimensional (2D) graphene (GF), and three-dimensional (3D) activated carbon (AC), were investigated as a support for Pt catalysts for the selective hydrogenation of 3,4-dichloronitrobenzene (3,4-DCNB) to 3,4-dichloroaniline (3,4-DCAN). Notably, the Pt/CNT catalyst with the lowest dimension exhibited the best conversion of 3,4-DCNB under mild reaction conditions, followed by Pt/GF. Comprehensive characterizations, including XRD, TEM, XPS, and in situ CO DRIFTS, reveal that the dimension of carbon supports plays an important role in the particle size and electronic properties of Pt species, consequently affecting the catalytic performances of Pt catalysts. According to the results, electron-deficient Pt particles with small sizes are more favorable for the hydrogenation of 3,4-DCNB to 3,4-DCAN. In addition, dynamic tests and in situ DRIFTS of 3,4-DCNB indicated that the carbonaceous supports will largely influence the adsorption and activation capacity of the Pt catalysts, so that Pt loaded on CNT and GF are superior to that on the AC. We believe this study will provide good guidance for designing efficient carbon-supported metal catalysts for selective hydrogenation.
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JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Bin Zhu,Xin He,Lingze Liu,Jinglin Liu,Xiaomin Zhang,Ben W.-L. Jang
Perovskite is one of the most promising materials for catalytic oxidation of volatile organic compounds (VOCs) because of its special tunable structure and properties as well as high stability. However, it commonly suffers from relatively low catalytic activity due to the low specific surface area and limited numbers of active sites caused by high synthesis temperature required. To improve the reactivity of the perovskite catalyst, a promising strategy is to construct highly dispersed noble metal sites on surfaces perovskite. However, generating highly active metallic sites while exhibiting good thermal stability remains a formidable challenge. Here, it’s demonstrated that the construction of highly efficient and robust platinum (Pt) sites on La 0.8 Sr 0.2 MnO 3-δ (Pt/LSMO) for toluene oxidation resulted in an almost three-fold increase in toluene conversion with a good stability. The key to the construction of these Pt sites is treating the oxidized Pt species on LSMO with hydrogen (H 2 ) plasma at low temperatures, which leads to the formation of high metallic Pt (Pt 0 ), ultrasmall Pt nanoparticles (∼1.3 nm), and high concentration of oxygen vacancy (O v ). These features facilitate the generation of a large number of highly active and stable Pt 0 -Mn 3+ -O v sites on Pt/LSMO, which contribute to the activation of toluene and oxygen species and, therefore, the catalytic reaction. This investigation demonstrates a promising approach of using the cold plasma technique to design and construct high-performing noble-based perovskite catalysts for toluene oxidation.
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 18
·9117-9122
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IF 5.968
Sha Chen,Hongye Zhang,Lingyan Wu,Yanfei Zhao,Changliang Huang,Maofa Ge,Zhimin Liu
Based on the galvanic replacement reaction between Cu nanoparticles and noble metal ions, a simple and efficient strategy was developed for the preparation of supported Cu–M (M = Pt, Pd, Ru, Rh) bimetallic nanoparticles under intense ultrasonication irradiation at ambient environment. A series of Cu–M/TiO2 bimetal catalysts with controllable composition, metal particle size less than 2 nm and narrow size distribution were obtained, and characterized by transmission electron microscopy (TEM), high resolution transmission electron microscope (HRTEM) with scanning TEM (STEM) mode, energy-dispersive X-ray spectrometers (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and ICP-AES analysis. It was demonstrated that most of the metal particles were present in the form of bimetallic state. The mechanism of this strategy was discussed. The resultant Cu–Pd/TiO2 was used to reduce nitrate at room temperature, and it exhibited extremely high activity.
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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.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Long Daojun,Liu Yongduo,Ping Xinyu,Chen Fadong,Tao Xiongxin,Xie Zhenyang,Wang Minjian,Wang Meng,Li Li,Guo Lin,Chen Siguo,Wei Zidong
The serious problem of carbon monoxide (CO) poisoning on the surface of Pt-based catalysts has long constrained the commercialization of proton exchange membrane fuel cells (PEMFCs). Regeneration of Pt sites by maintaining CO scavenging ability through precise construction of the surface and interface structure of the catalyst is the key to obtaining high-performance CO-resistant catalysts. Here, we used molybdenum carbide (MoC x ) as the support for Pt and introduced Ru single atoms (SA-Ru) at the Pt-MoC x interface to jointly decrease the CO adsorption strength on Pt. More importantly, the MoC x and SA-Ru are immune to CO poisoning, which continuously assists in the oxidation of adsorbed CO by generating oxygen species from water dissociation. These two effects combine to confer this anode catalyst (SA-Ru@Pt/MoC x ) remarkable CO tolerance and the ability to operate stably in fuel cell with high CO concentration (power output 85.5 mW cm −2 @20,000 ppm CO + H 2 – O 2 ), making it possible to directly use the cheap reformed hydrogen as the fuel for PEMFCs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Rundong Ma,Han Tian,Xu Yu,Xiangzhi Cui,Xinmei Hou,Shengli An
Hydrogen oxidation reaction (HOR) as the anode reaction in proton exchange membrane fuel cell, usually suffers from the high loading of platinum (Pt) and subsequent CO poisoning especially by using industrial crude hydrogen as fuel. In this work, we propose a directional electron transfer route from Pt to MoO 2- x in the macroporous structure to significantly enhance the HOR activity as well as the CO tolerance, which is constructed by interface engineering and defect strategy to anchor highly dispersed Pt nanoparticles onto the three-dimensional MoO 2- x -C framework. The optimized 2Pt-MoO 2- x -C with 1.02 wt% Pt demonstrates higher HOR peak current density (3.57 mA cm −2 ) and nearly 25 times higher mass activity than 20 wt% Pt/C. The excellent HOR performance is attributed to the synergistic effect between Pt and MoO 2- x species, in which the charge transfer from Pt to MoO 2- x improves H 2 adsorption ability of Pt and accelerates the activation of H 2 due to the reduced hydrogen binding energy of MoO 2- x caused by Pt-O construction, leading to the release of H* thereby the enhancement of HOR activity. The construction of three-dimensional macroporous structure enhances the HOR dynamics by promoting the conductivity, mass transfer and the exposure of active sites. Moreover, the formed Mo-OH in Pt-MoO 2- x -C can effectively react with CO species to remove the CO poisoning of Pt, endowing the excellent CO tolerance.
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