Chemical Engineering and Processing-Process Intensification
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2024
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IF 3.8
Muhammad Umair Mushtaq,Zhu Lin,Danni Li,Khurram Shahzad Ayub,Zain Abbas,Waqas Qamar Zaman,Ji Yang
The oxygen reduction reaction (ORR) is fundamental in numerous electrochemical energy conversion technologies, necessitating efficient catalysts to enhance reaction kinetics and reduce precious metal usage. This study focuses strategic clustering of Pt-Ni on Calcium Oxide/activated carbon (C/Ca) aerogels. Electrochemical analyses confirmed that incorporating Ni into Pt matrices significantly enhanced ORR activities with Pt 25 Ni 75 -C/Ca composition emerged as optimum. A positive shift in half-wave potential (905 mV vs. RHE) and impressive mass activity (72.50 Ag −1 at 85 V) highlight the potential of this composite as a highly effective and stable ORR catalyst. Pt-C/Ca demonstrated performance fluctuation, while Pt 25 Ni 75 -C/Ca showed remarkable stability after 40,000 cycles. Furthermore, C/Ca aerogels exhibited a significantly increased BET surface area, and the presence of Pt-Ni/pyridinic-N species on its surface C/Ca aerogel provided supplementary active sites that facilitated the adsorption and reduction of O 2 during ORR.
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JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 25
·11319-11332
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IF 3.5
Wang Yutong,Liang Xiao,Lv Yiyiwu,Li Xiao,Xia Qinghai,Yang Dezhi,Yang Yaling
This study synthesized Fe-doped dopamine carbon dots (Fe-DACDs) as a reducing agent and template hybrid Au and Pt nanoparticles (Au@Pt/Fe-DACDs). Au@Pt/Fe-DACDs with core–shell structures show strong peroxidase (POD)-like activity at physiological pH. A colorimetric and surface-enhanced Raman scattering (SERS) dual-mode detection system for glucose in human serum was constructed by combining Au@Pt/Fe-DACDs with natural glucose oxidase (GOx). The cascade catalysis reactions convert glucose into hydrogen peroxide (H 2 O 2 ), and then, the Au@Pt/Fe-DACDs as both POD-like nanozyme and Raman-enhancers oxidize colorless and weak Raman-active 3,3′,5,5′-tetramethylbenzidine (TMB) into blue and strong Raman-active ox-TMB. The linear response ranges of glucose are from 0.02 to 1 mM, with a detection limit of 2.3 μM for colorimetric detection and 0.01 mM to 0.7 mM with a detection limit of 1.4 μM for SERS sensors. Glucose content in human serum samples was successfully assayed with a good recovery from 97.6 to 105.3%. Overall, these results demonstrate a new way of designing biological detection systems based on SERS and colorimetric dual-mode sensing.
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ChemCatChem
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2024
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IF 3.8
Huan Yang,Xu Wang,Haowei Wang,Ya-Dong Xie,An-Hui Lu
Graphical The Sn species doped by coprecipitation with Al precursor introduces additional acidic sites on Sn-doped alumina, which after loading with Pt species exhibits superior reactivity and stability for propane dehydrogenation. Alumina-supported PtSn catalysts have been industrialized as the major catalysts for propane dehydrogenation, where Sn serves as an essential promoter. Herein, we synthesized a variety of Sn-doped alumina supports by regulating the precipitation order of Sn and Al precursors as follows: Sn precursor precipitated before Al, coprecipitated with Al, precipitated immediately after Al, or precipitates after 2 h of Al. The effect of Sn promoter on the surface acidic properties of alumina and, ultimately, on propane dehydrogenation was further investigated. The Sn species introduced by coprecipitation in alumina created additional surface strong acid sites, attributed to more Sn 4+ species on the surface, which are able to remain stable during the subsequent treatment. Consequently, the coprecipitated Sn species in the corresponding catalyst donate more electrons to Pt and reduce the metal particle size. As a result, the catalyst with Pt supported on the coprecipitated support (Sn+Al) exhibits superior initial propane conversion (43.2%) and stability ( k d = 0.035 h −1 ). This study provides new insight into the interaction between the two key components, tin promoter and alumina support, of Pt/Sn-Al 2 O 3 catalysts.
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JOURNAL OF CATALYSIS
·
2017
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IF 6.844
Xiaomei Ning,Yuhang Li,Baoqiang Dong,Hongjuan Wang,Hao Yu,Feng Peng,Yanhui Yang
The influence of catalyst synthesis strategy, including ethylene glycol (EG) reduction, sodium borohydride reduction and impregnation-H 2 -reduction, on the metal-support-interaction of Pt on nitrogen-doped carbon nanotubes (Pt/NCNTs) was systematically investigated and summarized. The catalytic performances were explored in the electro-oxidation reactions of glycerol, formic acid and CO, and the hydrolysis of ammonia borane (AB). Through X-ray photoelectron spectroscopy (XPS), density functional theory calculations and CO stripping technique, it was revealed that the synthesis methods drastically affected the electronic property of Pt nanoparticles (NPs). Pt NPs preferentially interacted with graphitic nitrogen in EG reduction method due to the electron donating property of graphitic nitrogen, while preferentially interacted with pyridinic nitrogen and defects in the impregnation-H 2 -reduction method due to the vacancies containing N P favoring the charged metal ion adsorption. The catalytic activity strongly depended on the electronic property of Pt NPs, which can be ascribed by the binding energy of Pt4f 7/2 (0) from XPS. The higher catalytic activity was obtained over electron-enriched Pt NPs for the electro-oxidation reactions. On the other hand, electron-deficient Pt NPs had better intrinsic activity in AB hydrolysis. The results herein suggested that appropriate synthesis method should be rationally applied to maximize the activities of Pt for targeting reactions benefited from electron-enriched or electron-deficient metal NPs.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2024
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IF 4.2
Yanhu Li,Mei Chen,Linghong Xue,Xu Li,Qingji Wang
Metal oxide semiconductor (MOS) sensor, one of the most widely used gas sensors, faces significant challenges in achieving lower detection limit. Addressing this issue, the utilization and strategic design of bimetallic catalysts present a promising avenue. In this paper, Pd-Pt was in-situ grown on ZnO nanoflowers directly prepared on planar substrate and a sensor for detecting acetone was developed. The test results reveal that the Pd-Pt/ZnO nanoflowers sensor exhibits a remarkable 107.6 response to 100 ppm acetone at 350 °C, while presenting a rapid response (15s). Moreover, this sensor demonstrates excellent capability in detecting acetone at concentrations as low as 1 ppb, showcasing impressive gas-sensing performance. The response of the sensor to 100 ppm acetone is twice that of ethanol at the same concentration. The exceptional performance of the sensor results from its distinctive nanoflower structure and the catalytic effect of the Pd-Pt, which offers an extensive surface area and enhances the rate of redox reaction for gas molecules. This in-situ grown method has great potential for improving the gas-sensing performance in gas sensor.
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ANALYTICAL SCIENCES
·
2024
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IF 1.8
Bai Chen-Chen,Lang Jin-ye,Wang Xin-yu,Zhao Jia-meng,Dong Lin-Yi,Liu Jun-Jie,Wang Xian-Hua
Abstract The present article introduced an natural enzyme-covered/amino-modified Pd–Pt bimetallic-doped zeolitic imidazolate framework (NAPPZ) for ultrasensitive and specific detection of glucose. The dodecahedral nanomaterial zeolitic imidazolate framework (ZIF-8)-loaded Pd–Pt bimetallic nanoparticles endowed the composite with peroxidase-like activity. The modification with glucose oxidase (GOx) facilitated the rapid access of H 2 O 2 produced through glucose oxidation to the Pd–Pt nanoparticles vicinity reducing diffusion. GOx specifically catalyzes the transformation of glucose into H 2 O 2 , which then H 2 O 2 rapidly migrates to the Pd–Pt nanoparticles, catalyzing the oxidation of colorless o-phenylenediamine into the orange–yellow product 2,3-diaminophenazine. Based on the aforementioned cascade reaction, the NAPPZ and NAPPZ based on ChOx were utilized for detecting glucose in human urine samples and cholesterol in milk, respectively. The NAPPZ strategy presented a broad detection range (20–1100 μmol L −1 ) and a low detection limit (15.9 μmol L −1 ) for glucose, and the NAPPZ based on ChOx strategy approach offered a broad detection range (10–500 μmol L −1 ) and low detection limit (6.4 μmol L −1 ) for cholesterol. Therefore, this novel method holds significant potential in the areas of clinical diagnostics and food safety. Graphical abstract
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高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 19
·10168-10176
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IF 9.3
Weixiang Guan,Chen Cao,Fei Liu,Aiqin Wang,Tao Zhang
Chemocatalytic conversion of cellulose to ethanol provides an alternative route for biofuel production with a theoretical carbon yield of 100%; however, it faces significant challenges of high catalyst cost and poor catalyst stability. In this work, we report a new strategy to decrease the use of expensive noble metals, by decorating mononuclear NbOx on a low-Pt Pt/WOx catalyst surface. The resulting 0.1Nb/0.5Pt/WOx catalyst gave rise to an ethanol yield of 33.7% together with an ethylene glycol yield of 21.8%, and the noble metal efficiency reached 25.90 gethanol gPt−1 h−1, an increase by a factor of 2–10 compared to those in the literature. Moreover, the catalyst stability was significantly enhanced by the decoration of mononuclear NbOx, allowing for recycling at least 7 times without obvious activity decay. Characterization revealed that Pt was highly dispersed at subnanometer and single atom scales, and modification with mononuclear NbOx facilitated hydrogen spillover and created more oxygen vacancies on the WOx surface upon hydrogen reduction, thus generating a higher density of Brønsted acid sites. This effect not only favored cellulose conversion to ethylene glycol but also promoted the hydrogenolysis of ethylene glycol to ethanol.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Chengfeng Wang,Hongdong Li,Weiping Xiao,Zhenyu Xiao,Guangrui Xu,Dehong Chen,Zexing Wu,Lei Wang
The interaction between metal nanoclusters and the carrier can enhance the electron transfer rate to optimize the hydrogen evolution reaction (HER) performance, but the common synthesis approaches often lead to metal particle agglomeration, and then blocking active sites. Herein, highly-dispersed Pt nanoclusters supported onto molybdenum boride (MoB) is developed through microwave approach with various solvent to regulate the catalytic performance. The synthesized electrocatalyst with the addition of methanol (Pt/MoB-M) exhibits excellent electrocatalytic performance towards HER with low overpotential (13 mV at 10 mA cm −2 ), small Tafel slope (24 mV dec −1 ), and high mass activity (10.06 A/mg Pt at 50 mV). This work presents a novel approach to prepare highly-efficient electrocatalysts for renewable energy-related applications of non-carbon supported low loading of precious metals.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Zhiyin Huang,Yuqin Peng,Lixin Xing,Mijia Xu,Meng Fang,Huiqi Xie,Jiamin Li,Yangdong Zhou,Puwei Wu,Ning Wang,Chunmei Tang,Mingjie Wu,Liguang Wang,Siyu Ye,Lei Du
Platinum (Pt) is inevitably employed to facilitate various electrocatalysis including hydrogen oxidation/evolution and oxygen reduction reactions (HOR/HER/ORR), the foundation for renewable energy conversion and storage. Pt-based high-entropy-alloy (HEA) catalysts have been recently presenting promises to improve intrinsic activity of unit mass Pt. However, their current synthesis methods always produce large particles—some can control small size but have to use complicated recipe and/or highly toxic and expensive chemicals. Alternatively, a facile microenvironment regulation strategy is herein proposed to tune solvent polarity and nanoparticle-support interactions within the precursors for carbon-thermal shock pyrolysis. We found that the decreased solvent polarity and enhanced particle-support affinity can jointly control the nanoparticle size ultimately to ∼2.68 nm with ∼10 wt% Pt loading. The compressed lattice fringe in such HEA particles leads to electron accumulation at Pt atoms and build a moderate charge density rearrangement, showing superior multifunctional HER/HOR/ORR activity to Pt/C in acidic media.
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TALANTA
·
2018
·
IF 4.244
Lingxian Ye,Guangying Zhao,Wenchao Dou
A sensitive Point-of-Care Testing (POCT) with Au-Pt bimetallic nanoparticles (Au@Pt) functionalized silica nanoparticle (SiO 2 NPs) and Fe 3 O 4 magnetic nanoparticles (Fe 3 O 4 NPs) was designed for the quantitative detection of Escherichia coli O157:H7 ( E. coli O157:H7). The poly-(4-styrenesulfonic acid- co -maleic acid) (PSSMA) as a negatively charged polyelectrolyte can be easily coated on surface of the amino group modified SiO 2 NPs via electrostatic force . PSSMA is also a good stabilizer for water-soluble bimetallic nanostructures . The PSSMA is first time used as a “bridge” to connect the negative charge Au@Pt NPs to the SiO 2 NPs, forming Au@Pt/SiO 2 NPs. Antibody and invertase conjugated Au@Pt/SiO 2 NPs (denoted as Ab/invertase-Au@Pt/SiO 2 NPs) were used as signal labels. Monoclonal antibody against E. coli O157:H7 (Ab) functionalized magnetic nanoparticles (denoted as Ab-Fe 3 O 4 @SiO 2 NPs) were used to enrich and capture the E. coli O157:H7 in positive sample. The immunosensing platform also composed of a personal glucometer (PGM) using for signal readout. Based on this sandwich-type immunoassay , the invertase in the final formed sandwich immunocomplex catalyzed the hydrolysis of sucrose to produce a large amount of glucose for quantitative readout by the PGM. Under optimal conditions, a linear relationship between the glucose concentration and the logarithm of E. coli O157:H7 concentration was obtained in the concentration range from 3.5 × 10 2 to 3.5 × 10 8 CFU mL −1 with a detection limit of 1.83 × 10 2 CFU mL −1 (3σ). This method was used to detect E. coli O157:H7 in spiked milk samples, indicating its potential practical application. This protocol can be applied in various fields of study.
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JOURNAL OF POWER SOURCES
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2018
·
IF 6.945
Juan Bai,Shi-Hui Xing,Ying-Ying Zhu,Jia-Xing Jiang,Jing-Hui Zeng,Yu Chen
Rationally tailoring the surface/interface structures of noble metal nanostructures emerges as a highly efficient method for improving their electrocatalytic activity , selectivity, and long-term stability. Recently, hydrogen evolution reaction is attracting more and more attention due to the energy crisis and environment pollution. Herein, we successfully synthesize polyallylamine-functionalized rhodium nanosheet nanoassemblies-carbon nanotube nanohybrids via a facile one-pot hydrothermal method . Three-dimensionally branched rhodium nanosheet nanoassemblies are consisted of two dimensionally atomically thick ultrathin rhodium nanosheets. The as-prepared polyallylamine-functionalized rhodium nanosheet nanoassemblies-carbon nanotube nanohybrids show the excellent electrocatalytic activity for the hydrogen evolution reaction in acidic media, with a low onset reduction potential of −1 mV, a small overpotential of 5 mV at 10 mA cm −2 , which is much superior to commercial platinum nanocrystals . Two dimensionally ultrathin morphology of rhodium nanosheet, particular rhodium-polyallylamine interface, and three-dimensionally networks induced by carbon nanotube are the key factors for the excellent hydrogen evolution reaction activity in acidic media.
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APPLIED ENERGY
·
2018
·
IF 7.9
Y.H. Kwok,Y.F. Wang,Alpha C.H. Tsang,Dennis Y.C. Leung
A Ru@Pt core–shell nanoparticles decorated graphene-carbon nanotube composite was produced as a porous anode for a flow-through direct methanol microfluidic fuel cell (MFC). The composite was characterized by TEM and SEM, which reveals that the size of the nanoparticles is less than 5 nm and the pore size of the porous electrode is less than 10 µm. TEM image showed that the nanoparticles were evenly distributed in the carbon substrate without agglomeration. The carbon nanotubes (CNT) increased the composite conductivity by connecting the graphene oxide nanosheets together. An orthogonal flow air-breathing microfluidic fuel cell combining the advantages of co-flow and counter flow MFC was designed to compare the electrode performances and a maximum specific power of 13.1 mW/mg catalyst was achieved with 1 M methanol in 1 M KOH as supporting electrolyte, which outperformed most others’ works in the literature.
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