ACS Applied Energy Materials
·
2021
·
IF 6.024
Chuanliang Li,Yangyang Ren,Fan Gao,Baosong Li,Lanlan Li,Xinghua Zhang,Zunming Lu,Xiaojing Yang,Xiaofei Yu
Pt-based nanoframes with unique morphologies are one of the most promising catalysts for the oxygen reduction reaction (ORR). In this study, stacked Pd@PtPd core–shell rhombic dodecahedrons (Pd@PtPd RDs) were obtained by a solvothermal method, and then PtPd nanonets (PtPd NNs) were formed by etching of Pd@PtPd RDs with Fe(NO3)3 and HNO3. Combining the time-dependent changes of morphology, atomic ratio, and elemental distribution, the formation mechanism of PtPd NNs was explored. According to the electrochemical tests, the mass and specific activities of PtPd NNs were 4.7 and 7.6 times higher than those of Pt/C and 2.5 and 2.2 times as large as those of Pd@PtPd RDs in an alkaline solution, respectively. Meanwhile, PtPd NNs displayed higher stability than Pd@PtPd RDs and Pt/C. The enhanced catalytic performance might result from the unique open structures, the compressive strain, and the electron transfer from Pd to Pt atoms.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 1
·1-10
·
IF 2.253
Liu Wenwen,Peng Renfu,Pan Jun
The severe recombination of photoinduced carriers is one of the major problems encountered in C 3 N 4 -based photocatalyst for hydrogen generation. Herein, PtPd/C 3 N 4 composites by in situ growth of cubic PtPd bimetallic co-catalyst on the surface of C 3 N 4 were constructed for photocatalytic hydrogen generation under visible light irradiation. The phase structure, microstructure, and optical property were characterized by X-ray diffraction, transmission electron microscopy, and UV-Vis diffuse reflectance spectroscopy. Photocatalytic hydrogen generation results showed that the growth of a moderate amount of cubic PtPd bimetallic co-catalyst on C 3 N 4 is excellent beneficial for enhancing hydrogen generation activity. By optimizing the loading content of cubic PtPd bimetallic co-catalyst, the PtPd/C 3 N 4 composite provided a maximum hydrogen generation rate of 54.31 μmol h −1 . The enhancement of the photocatalytic activity can be attributed to the efficient separation and transfer of photoinduced carriers. On one hand, PtPd bimetal can extract electrons from C 3 N 4 , which promotes the separation efficiency of the carriers. On the other hand, the face-to-face interface formed between PtPd cubes and C 3 N 4 nanosheets has a large contact area, resulting in lots of unique high-speed carrier transfer channels in PtPd/C 3 N 4 composite, which promotes the transfer efficiency of the carriers. The work highlights the construction of less expensive and suitable shape of co-catalyst for enhanced photocatalytic activity.
研究领域:
材料科学
·
光催化
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Qiankun Zhang,Tao Shao,Yu Li,Dehong Bai,Ziyu Xue,Shijie He,Dongxia Zhang,Xibin Zhou
Control of the chemical composition and morphology of electrochemical nanocatalysts is a promising strategy to effectively promote electrocatalytic oxidation in direct methanol fuel cells (DMFCs). Here, we describe a general soft-template-directed one-pot synthesis for the formation of bimetallic mesoporous nanospheres (MNSs) with cylindrically open mesoporous nanochannels. Three-dimensional (3D) well-dispersed bimetallic PtPd MNSs were prepared through in situ co-reduction of Pt and Pd precursor on the soft-templating structural directing amphiphilic surfactant of bisoctyl dimethyl ammonium chloride (BDAC) under optimal reaction conditions without using any toxic organic solvent. Owing to the synergistic advantages in structure and composition, the as-prepared mesoporous morphology of the bimetallic PtPd MNSs has more active sites and accelerates electron/mass transfer. Especially, the Pt 1 Pd 4.8 MNSs possessed a mass activity of 3450 mA mg metal −1 and specific activity of 163.8 mA cm −2 , which are 6.63 and 20.76 times higher than commercial Pt/C (520 mA mg Pt −1 and 7.89 mA cm −2 ). Therefore, it shows outstanding catalytic activity and stability toward electrocatalytic oxidation of methanol under alkaline conditions.
研究领域:
材料科学
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电化学
·
能源科学
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DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 18
·8927-8933
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IF 11.301
Kai Deng,Tianlun Ren,You Xu,Songliang Liu,Zechuan Dai,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
Engineering the composition and structure of hybrid electrocatalysts based on precious Pt and non-precious metals is of paramount importance for increasing the utilization efficiency of Pt and enhancing their electrocatalytic performance. Here we report the construction of novel crystalline PtPd @ amorphous NiB core–shell heterostructures (c-PtPd@a-NiB CSHs) with crystalline PtPd mesoporous truncated octahedral nanocages (c-PtPd MTONs) as the cores and amorphous NiB (a-NiB) nanosheets as the shells via a three-step strategy. This hybridization, between c-PtPd MTONs and a-NiB nanosheets, leads to increased catalytically active sites, a modulated surface electronic structure, and enhanced hydrophilic properties. With these properties, the as-obtained c-PtPd@a-NiB CSHs exhibit enhanced electrocatalytic activity toward the hydrogen evolution reaction (HER) in an alkaline medium, with a small required overpotential of 31 mV (@-10 mA cm−2), a low Tafel slope of 40.9 mV dec−1, and excellent long-term catalytic durability.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 58
·33678-33683
·
IF 3.049
Caini Fan,Junjia Liu,Haiying Zhao,Ling Li,Min Liu,Jing Gao,Li Ma
PtPd nanoflowers (PtPd NFs) exhibit intrinsic peroxidase-like activity as nanozymes, but the nanozymes lack substrate specificity and have low catalytic activity. Herein, a molecularly imprinted nanogel on PtPd NFs was prepared by using 3,3′,5,5′-tetramethylbenzidine (TMB) as the template through the aqueous precipitation polymerization method. After the TMB was washed out, many substrate binding pockets were retained in the PtPd NFs. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and powder X-ray diffraction (XRD) were employed to characterize the molecularly imprinted polymer (MIP) PtPd nanoflowers (T-MIP-PtPd NFs). The obtained T-MIP-PtPd NFs exhibited enhanced catalytic activity and specific recognition for TMB. Compared with PtPd NFs, T-MIP-PtPd NFs showed a linear range from 0.01–5000 μM and a detection limit of 0.005 μM toward the detection of H2O2. Glucose can also be sensitively detected through cascade reaction by the T-MIP-PtPd NFs and glucose oxidase. Therefore, molecular imprinting on nanozymes technology shows promising application in biocatalysis and sensing fields.
研究领域:
生物化学
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纳米医学
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分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chuanxuan Zhou,Mengyun Wang,Cheng Huang,Fuchao Yang
Real-time and high efficient monitoring of triethylamine (TEA) is crucial for chemical industry production and environmental safety. However, it is still challenge to achieve ppb level detection efficiently and exact understanding. In this paper, bimetallic PtPd sensitized vacancies enriching WO 3 hollow microspheres materials were designed and harvested an ultra-high response and selectivity to TEA gas. It was found that the oxygen vacancies of WO 3 hollow microspheres can be enhanced by the introduction of Fe element. Furthermore, the PtPd@Fe-WO 3 exhibited a remarkable sensing response (409.58–20 ppm TEA), which was 4.85 times higher than that of Fe-WO 3 -based sensor and 21.28 times higher than that of pure WO 3 sensor. This further enhancement of response can be attributed to the strong catalytic spillover effect and electron sensitization of Pt as well as the reversible redox cycling properties of Pd. In addition, the PtPd@Fe-WO 3 material also possesses fast response, excellent selectivity, long-term stability, and a low detection limit of 69.59 ppb, and the gas sensing mechanism was understood by density functional theory (DFT). The proposed bimetallic PtPd sensitized oxygen vacancies enriching WO 3 system is a promising candidate for building high-performance TEA sensors for practical applications.
研究领域:
材料科学
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化学传感器
·
环境监测
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Yi Zhang,Guoqiang Shu,Zhongtao Shang,Kui Ma,Lei Song,Chao Wang,Chang-An Zhou,Hairong Yue
Platinum-based electrocatalysts usually exhibit limited and quickly vanished activity for the methanol oxidation reaction (MOR) due to active site occupation and surface intermediate poisoning, especially CO. The attendant synergistic effect of the alloy strategy is often executed to improve these flaws. Here, PtPd nanoflower alloys uniformly anchored on the carbon paper were successfully synthesized by electrodeposition to construct well-defined active sites, over which high MOR activity and tolerance were realized. The homogeneous alloy structure of PtPd nanoflowers was confirmed by TEM and XAFS. Impressively, the Pt1Pd1-N NFs/CP exhibited an excellent mass activity of 9.25 A mgPt+Pd–1 and specific activity of 13.2 mA cmECSA–2 of MOR in the alkaline electrolyte, and 87.8% of the initial activity was still retained after 500 cycles. In situ infrared spectroscopy revealed that Pt1Pd1-N NFs/CP ensured the complete oxidation of methanol following a CO-free path. The investigation of the electronic and coordination structure demonstrated that the Pt–Pd adjacent sites with a zero valence are the highly active center for MOR, and the synergistic effect between Pt and Pd greatly improved the MOR electrocatalytic performance. This work offers an effective strategy to precisely control the number and structure of decorating species for constructing alloy nanocatalysts to enhance the electroactivity toward MOR.
研究领域:
材料科学
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电化学
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催化科学
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DOI
高影响因子
RARE METALS
·
2021
·Vol. 40
·期 12
·3554-3560
·
IF 4.003
Liu Wen-Wen,Pan Jun,Peng Ren-Fu
The shape-dependent performance of metal co-catalysts in photocatalysis has been one of the research focal points in recent years. In this study, PtPd/C 3 N 4 hybrid structures were constructed to reveal the effect of the shape of the PtPd bimetallic co-catalyst on the performance of photocatalytic hydrogen generation. PtPd nanocubes (NCs) and nanotetrahedrons (NTs) were sequentially deposited in situ on the surface of C 3 N 4 nanosheets, establishing a strong contact interface to ensure the smooth transfer of photoinduced electrons. Ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy and photoelectrochemical experiments revealed that the PtPd NCs/C 3 N 4 photocatalyst had comparable light absorption ability and equivalent carrier separation and transfer efficiency in comparison with the PtPd NTs/C 3 N 4 photocatalyst, which excluded the influence of these factors on shape-dependent performance. The photocatalytic hydrogen generation results indicate that the hydrogen generation rate of the PtPd NCs/C 3 N 4 photocatalyst is 1.33 times higher than that of the PtPd NTs/C 3 N 4 photocatalyst, demonstrating that the cubic PtPd bimetallic co-catalyst is more conducive to hydrogen generation compared to the tetrahedral PtPd bimetallic co-catalyst. Graphical abstract
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Jian Wang,Junlian Shi,Shuai Wang,Shiguang Fan,Aijun Guo,Zongxian Wang,He Liu
While Pt-based heterogeneous catalysts have been extensively studied for cyclohexane dehydrogenation, the reaction efficiency under low temperatures remains to be resolved. In this paper, ultrafine PtPd alloy nanoparticles homogeneously anchored on nitrogen-doped carbon were synthesized and applied for cyclohexane dehydrogenation. The experimental results indicate that the synergistic effect of Pt-Pd in PtPd/CN catalyst enhances the activity and durability of the catalyst in cyclohexane dehydrogenation compared with Pt/CN and Pd/CN catalysts. The as-prepared catalyst (labeled as Pt 0.75 Pd 0.25 /CN) exhibits an excellent catalytic performance with an initial TOF value of 90.07 mmol·g −1 metal ·min −1 and a 100% H 2 purity for cyclohexane dehydrogenation at 180 °C, exceeding reported values under comparable reaction conditions. Catalyst characterizations and DFT calculations reveal that the electronic coupling effect of Pd and Pt in PtPd/CN catalyst makes the d-band center of Pt active sites closer to the Fermi level, which promotes the specific adsorption/activation of cyclohexane on Pt active sites, thus improving the catalytic performance of cyclohexane dehydrogenation. Under this guidance, the synthesized PtRu/CN and PtIr/CN alloy catalysts exhibited similar enhanced activity in cyclohexane dehydrogenation. This work provides insights into the rational design of efficient and stable Pt-based bimetallic catalysts for cyclohexane dehydrogenation.
研究领域:
化学
·
材料科学
·
催化反应
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 9
·2280-2287
·
IF 6.569
Yangyang Ren,Chuanliang Li,Baosong Li,Fan Gao,Xinghua Zhang,Xiaojing Yang,Lanlan Li,Zunming Lu,Xiaofei Yu
Here, PtPd nanoframes were prepared by etching Pd@PdPt core–shell rhombic dodecahedrals (RDs) with Fe3+ provided by iron chloride hexahydrate (FeCl3·6H2O). Based on the experimental results, PtPd nanoframes were formed due to the etching of Pd cores. In terms of catalytic performance, the measured specific activity and mass activity of PtPd nanoframes were 1.11 mA cm−2 and 840.38 mA mg−1, respectively, which were much higher than those of Pd@PdPt core–shell RDs, Pt black and Pt/C, suggesting the preeminent activity of PtPd nanoframes. Meanwhile, PtPd nanoframes showed better stability compared with Pd@PdPt core–shell RDs, Pt black and Pt/C. The strengthened catalytic properties may be caused by the larger surface area owing to the novel structure and the strong electronic interaction between Pt and Pd.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yuning Qu,Zhe Zheng,Zehui Yu,Ming Song,Yanshuang Zhang,Yongnan Zhao,Jianguo Yu
In this study, chain-like PtPd/PVA catalysts were synthesized by a two-step hydrothermal method with the assistance of polyvinyl alcohol as a green reducing agent, structure guiding agent, dispersing agent , and binder. Among all the catalysts, Pt 1 Pd 5 /PVA catalyst shows the highest mass activity (3774.2 mA mg pt −1 ) for methanol oxidation reaction. Also, the residual activity of Pt 1 Pd 5 /PVA catalyst after chronoamperometry (CA) test of 28 h is close to that of commercial Pt/C after CA test of 5000 s. The excellent electrocatalytic activity of Pt 1 Pd 5 /PVA catalyst is mainly attributed to the synergistic effect between Pt and Pd. This can optimize the surface electronic structure and reduce the adsorption of CO-like species over the Pt surface. Besides, the unique chain network structure of PtPd forms a conductive network of self-conducting electrons. At the same time, a large amount of PVA causes an ultra-long stability through the coating of PtPd catalyst by PVA and the interaction with PVA and PtPd. This work contributes a facile and clean method for the synthesis of stable and efficient precious metal alloy catalysts for alcohols oxidation reaction .
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ELECTROANALYSIS
·
2018
·Vol. 30
·期 8
·1801-1810
·
IF 2.851
Li Ma,Liya Zhou,Ying He,Lihui Wang,Zhihong Huang,Yanjun Jiang,Jing Gao
Mesoporous bimetallic PtPd nanoflowers (MPtPdN) were synthesized by a surfactant-directing method. The MPtPdN was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and wide-angle X-ray diffraction (XRD). The use of MPtPdN as a platform for the indirect electrochemical detection of organophosphate pesticides (OPs) via enzymatic inhibition pathway was demonstrated. Due to the nanostructure of MPtPdN and the synergy effect of the noble metal nanoparticles, a novel and sensitive acetylcholinesterase (AChE) biosensor for OPs detections based on MPtPdN and enzyme inhibition was prepared. The inhibition of omethoate exhibited a linear relationship from 4.7×10 −11 to 4.7×10 −8 M with a detection limit of 1.7×10 −12 M (S/N=3). The proposed AChE biosensor was reliable and can be used to measure the concentration of omethoate in different spiked samples with high accuracy and satisfactory recovery. The preparation of biosensors based on the MPtPdN can be further extended to construct many other important enzyme biosensors.
研究领域:
生物传感器
·
分析化学
·
环境科学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）