ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Pengtao Qiu,Jinglei Bi,Xiaojing Zhang,Shengchun Yang
We present a novel synthetic strategy for the shape-controlled synthesis of Pt-based alloy nanoparticles (NPs) in inorganic molten salt without using any organic surfactants or capping agents. Graphene oxide (GO) was chosen as the stabilizer in the inorganic molten salt synthetic strategy, due to the existence of various oxygen-containing functional groups on its surface, which adsorb, anchor, and stabilize the metal ions or NPs. After GO was added in molten salt, the PtPd nanosheets were formed on its surface in H2 atmosphere. In addition, when KI was chosen as the shape-inducing agent to selectively adsorb on and fully protect the (100) facets of alloys, PtPd nanocubes with core–shell structure, PtCu nanohemicubes, and PtPdCu nanocubes were prepared successfully on the surface of GO in molten salt. Introduction of GO as the stabilizer in molten salt proves a new approach in synthesis of Pt-based nanocrystals with controlled morphologies.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2016
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IF 3.014
Jiayi Jin,He Mei,Huimin Wu,Shengfu Wang,Qinghua Xia,Yu Ding
The Cu 2 O@Pt nanoparticles were prepared by a two-step method, using Vulcan XC-72 carbon as support (donated as Cu 2 O@Pt/C). Transmission electron microscopy , X-ray diffraction and X-ray photoelectron spectroscopy were used to characterize the resulting Cu 2 O@Pt core-shell nanoparticles. The chemically modified electrode based on Cu 2 O@Pt/C nanocomposites was employed to eliminate the interference from ascorbic acid and uric acid for the sensitive and selective determination of dopamine. The electrochemical results indicate that the Cu 2 O@Pt/C nanocomposites show better electrocatalytic activity for the oxidation of dopamine than Pt/C nanocomposites with a linear range from 10 nM to 1027.16 μM, a detection limit of 3 nM (S/N = 3) and sensitivity of 638.0 μA mM −1 cm −2 . Moreover, the sensor exhibits excellent long-time stability, good reproducibility and can be applied for practical application.
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Green Chemical Engineering
·
2024
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IF 9.1
Yang Sun,Jianfeng Wang,Siyuan Sun,Haojia Zhong,Kexin Wei,Hongchen Liu,Qiang Wei,Yongfeng Li,Fan Yang
Pore structures in carbon materials have been referred to regulate the properties of carbon, which are meaningful for improving electro-catalytic performance. Herein, a series of Pt-based porous carbon catalysts (Pt/MPC) are synthesized, which are used in hydrogen evolution reaction (HER), oxygen reduction reaction (ORR) and methanol oxidation reaction (MOR). The coupling of template method and KOH activation is used to synthesize carbon carrier, then Pt NPs are loaded on it by NaBH 4 reduction. The well-tuned catalyst Pt/MPC (131) exhibits an overpotential of 34 mV and 23 mV at the current density of 10 mA cm -2 in 1 M KOH and 0.5 M H 2 SO 4 for HER (under 5.76 wt.% Pt load), respectively. The micropore regulated by KOH provides a high ion-accessible surface, and mesoporous formed by MgO template provide a fast channel for ion transport, which leads to great electron transport and increased exposure of Pt. Besides, the MOR activity of Pt/MPC (131) is 1932.05 mA mg -1 , which is 2.68 times higher than that of commercial 20%Pt/C (721.14 mA mg -1 ), and has half-wave potential of 0.82 V on ORR. The abundant hierarchical pores and highly utilized Pt active sites are favorable for accelerating the sluggish kinetics of HER, MOR, and ORR. This work provides an anticipated perspective of applicable Pt-based catalyst for advanced electrocatalysts.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 28
·17574-17585
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IF 10.7
Xinping Yang,Shucheng Li,Yan Zhang,Fagui Qiu,Yanbin Sun,Weikun Ning,Qinglong Tao,Wenqing Li,Shiding Miao
Nickel–iron layered bimetallic hydroxides (Ni3Fe LDHs) are regarded as excellent materials for electrodes for electrolyzing water but still require high overpotentials because of their weak adsorption/desorption of oxygen intermediates by metal–oxygen bonding (M–O). Herein, the rare earth element thulium (Tm) was selected for incorporation into Ni3Fe LDH owing to its particular electronic structure of 4f136s2, and the composite LDH was regulated using an electron-compensated buffer to avoid the overoxidation of M–O and was proven to be an excellent OER electrocatalyst. By further loading platinum (Pt) on the Tm-doped LDH (Ni3Fe LDH/NiFe2O4/Pt–Tm), the HER performance was also found to be greatly improved, and overall water splitting catalysts could be constructed utilizing the two types of Ni3Fe LDH-based materials. The state-of-the-art optimized Ni3Fe LDH/NiFe2O4/Pt–Tm composite in 1.0 M KOH solution achieved an OER overpotential as low as 224.0 mV at a current density of 10.0 mA cm−2, which was one of the lowest among previously reported LDHs, with a Tafel slope of 54.81 mV dec−1 and a turnover frequency (0.1969 s−1). For HER catalysis, Ni3Fe LDH/NiFe2O4/Pt–Tm exhibited an even lower overpotential of 125.0 mV (vs. 238.0 mV for bare Ni3Fe LDH) at 10.0 mA cm−2, and only 1.69 V was required to drive overall water splitting. The electrocatalytic stability was evaluated for 5000 cycles of cyclic voltammetry scanning and chronoamperometry tests. Raman and XPS spectra confirmed that structural regulation promoted the generation of NiOOH and the adsorption of intermediates. In particular, oxygen vacancies and unsaturated ligands were preserved, providing abundant active sites for electrocatalysis.
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Arabian Journal of Chemistry
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2024
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IF 5.3
Alaaddin M.M. Saeed,Gui-Ping Cao,Ahmed S. Al-Fatesh,Salwa B. Alreshaidan,Nawab Ali,Mustapha Sani Shehu,Jun-Yang Yan
This study presents the practical synthesis of platinum nanoparticle decorated multi-walled carbon nanotubes (Pt/MWCNTs) catalysts and their novel use in hydrogenating styrene–butadiene–styrene (SBS) triblock copolymers. The Pt/MWCNTs catalyst exhibited remarkable activity and selectivity in fully hydrogenating the polystyrene and polybutadiene segments within a styrene–butadiene–styrene (SBS) triblock copolymer. The characterizations proved that the Pt/MWCNTs catalyst possesses well-dispersed Pt nanoparticles with a large specific surface area (159.5501 m 2 /g). Additionally, the catalyst is with a mesoporous structure. As a result, the catalytic hydrogenation of SBS using a Pt/MWCNTs catalyst achieves a high degree of hydrogenation, with 100 % selectivity towards the polystyrene and polybutadiene blocks in the SBS triblock copolymer at 180 °C after 9 h. The Pt/MWCNTs catalyst was characterized via SEM, TEM, HRTEM, XRD, XPS, Raman, TG, and BET. Simultaneously, the SBS and cyclic block copolymer (CBC) were characterized via GPC, FTIR, 1 H NMR, 13 C NMR, and TG. In this work, Pt/MWCNTs catalyst with high activity and selectivity is developed for unsaturated polymer hydrogenation.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 6
·1-11
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IF 5.3
Hao Xuanxuan,Liu Zhimin,Zheng Tongtong,Fan Yunfeng,Hu Leqian
A signal-amplified platform was designed to construct a label-free electrochemical aptasensor for lead ions (Pb 2+ ) assay. First, flower-like molybdenum disulfide-supported AuNPs (AuNPs@MoS 2 ) nanocomposites were synthesized and used as substrates for modifying the electrode. The AuNPs@MoS 2 material possessed large surface area and superior biocompatibility, which was beneficial to improve the loading amount of the complementary DNA (cDNA) and amplified the response signal. Importantly, the prepared core–shell Pt@Pd bimetallic nanoparticles (Pt@PdNPs) were used to conjugate with redox marker thionine (Thi) and aptamer (Apt) for further signal amplification; the obtained signal probes (Thi-Pt@PdNPs-Apt) were connected by the cDNA assembled on the electrode through DNA hybridization. Differential pulse voltammetry was performed to monitor the signal of Thi. After incubating of aptasensor with Pb 2+ , the specific recognition of Pb 2 + and Apt resulted in the dissociation of aptamer-cDNA complex, thereby the Thi-Pt@PdNPs-Apt separated from the electrode surface and decreased current response was obtained. The prepared electrochemical sensor exhibited linear response to Pb 2+ in the range 5.0 × 10 −4 –100 nM and a detection limit of 1.0 × 10 −4 nM was achieved. The sensor was applied to the determination of Pb 2+ in actual sample with high sensitivity and accuracy, demonstrating potential applications in heavy metal monitoring. Graphical Abstract
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yaqi Qu,Hualiang An,Xinqiang Zhao,Yanji Wang
High dispersion of active metal is an inevitable requirement to improve the catalytic performance of supported metal catalysts and achieving this goal always requires the support with a large specific surface area. Here we innovatively prepared a ZrO 2 @Pt catalyst using ZrO 2 with a small specific surface area as the core which is coated with highly dispersed Pt nanoclusters (<2 nm). In this process, the surface of ZrO 2 was firstly functionalized to increase the number of hydroxyl group, Pt nanoclusters were formed simultaneously and uniformly coated on the ZrO 2 surface. In this work, much attention was paid to the role of 2-[4-(2-hydroxyethyl)-1-piperazinyl] ethanesulfonic acid (HEPES) and ethanol in the one-pot preparation process. The results showed that HEPES acted as a reductant, while treatment with ethanol promoted both the generation of hydroxyl groups on ZrO 2 surface and the reduction of Pt precursor under mild conditions. As-prepared ZrO 2 @Pt catalyst showed excellent catalytic performance in the selective hydrogenation of nitrobenzene; nitrobenzene was completely converted to aniline with 100 % selectivity at room temperature and 8 bar H 2 pressure within 30 min, and the TOF reached as high as 3304 h −1 . Moreover, ZrO 2 @Pt also exhibited a good reusability and a broad substrate applicability. The results of both DRIFTS analysis and DFT calculation demonstrated that the hydrogenation of nitrobenzene on ZrO 2 @Pt catalyst followed the condensation reaction pathway. Our findings can provide a new approach to obtaining highly dispersed metal nanoparticles on the support with a small specific surface area.
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ChemSusChem
·
2024
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IF 7.5
Yichi Guan,Dezhi Su,Yan Zhang,Bowen Zhang,Yanyi Liu,Pengcheng Liu,Lishou Ban,Tao Qin,Kaili Wang,Ganghui Chu,Xijun Liu,Jia He
The development of advanced electrocatalysts for the abiotic direct glucose fuel cells (ADGFCs) is critical in the implantable devices in living organisms. The ligand effect in the Pt shell-alloy core nanocatalysts is known to influence the electrocatalytic reaction in interfacial structure. Herein, we reported the synthesis of ternary Pt@PdRu nanoalloy aerogels with ligand effect of PdRu on Pt-enriched surface through electrochemical cycling. Pt@PdRu aerogels with optimized Pt surface electronic structure exhibited high mass activity and specific activity of Pt@PdRu about 450 mA·mgPt-1 and 1.09 mA·cm-2, which were 1.4 and 1.6 times than that of commercial Pt/C. Meanwhile, Pt@PdRu aerogels have higher electrochemical stability comparable to commercial Pt/C. In-situ FTIR spectra results proved that the glucose oxidation reaction on Pt@PdRu aerogels followed the CO-free direct pathway reaction mechanism and part of the products are CO2 by completed oxidation. Furthermore, the ADGFC with Pt@PdRu ultrathin anode catalyst layer showed a much higher power density of 6.2 mW·cm−2 than commercial Pt/C (3.8 mW·cm-2). To simulate the blood fuel cell, the Pt@PdRu integrated membrane electrode assembly was exposed to glucose solution and a steady-state open circuit of approximately 0.6 V was achieved by optimizing the glucose concentration in cell system.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Zhi Liang Zhao,Qi Wang,Lian Ying Zhang,Hong Ming An,Zhou Li,Chang Ming Li
Development of an inexpensive high performance catalyst with low Pt loading remains a great challenge. Herein galvanic exchange-formed ultra-low Pt loaded porous Ag-Pd binary alloy nanotubes (Pt/Ag-Pd) was prepared as a catalyst toward oxygen reduction reaction (ORR). With highly dispersed active but ultra-low Pt atoms (Pt: about 5.8 wt%) on the porous binary alloy surface, the Pt/Ag-Pd catalyst increases mass activity toward ORR by 1.82 times than commercial Pt/C while possessing excellent operation stability. The performance enhancement is mainly attributed to the unique porous Pt shell/Ag-Pd core tubular structure for increased active sites and facilitated interfacial electron transfer rate by a unique Ag-Pd jointly modified electronic structure. This catalyst holds great promise for practical applications in low temperature fuel cells.
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高影响因子
JOURNAL OF POWER SOURCES
·
2024
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IF 8.1
Wenyi Wang,Long Tang,Cheng Chen,Xueqin Wang,Yuanyuan Wang,Wencong Sun
Efficient and stable electrocatalysts with low platinum content are crucial for the practical application of fuel cells. The development of Pt-based single atom catalysts (SACs) has emerged as a promising research direction. In this study, we design and prepare a SACs based on MoS 2 with Pt–S–Mo and Pd–S–Mo active sites (Pd, Pt–MoS 2 ) by successively occupying vacancies, while maintaining the individual characteristics of the active sites. The resulting Pd, Pt–MoS 2 catalyst exhibits excellent electrocatalytic activity for oxygen reduction reaction (ORR), long-term stability, and resistance to common poisons (SCN − , S 2− , and methanol) under neutral conditions. Meanwhile, the microbial fuel cell (MFC) equipped with Pd, Pt–MoS 2 exhibits excellent performance in terms of actual electricity generation performance and sewage purification capacity with an ultrahigh power density, average chemical oxygen demand (COD) removal rate, and coulombic efficiency (CE) of 1398.6 ± 43.5 mW m −2 , 96.2 ± 2.2 %, and 22.5 ± 0.5 %, respectively. This strategy will provide new insights into the development of advanced bimetallic as well as polymetallic doped vacancies of MoS 2 SACs.
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Nanoscale
·
2024
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IF 5.8
Liping Lian,Hui Xu,Ruchen Shu,Yujie Tan,Nan Wang,Jinzhu Ma,Feng Qin,Danyan Cen,Jianyuan Hou,Renxi Zhang
A novel catalyst was fabricated using a two-step nonthermal plasma method by regulating surface hydroxyl groups on Na/activated carbon (AC) with 0.1 wt% Pt loading (Pt/Na/AC (P&P)) and achieved high formaldehyde (HCHO) oxidation performance at ambient temperature. Based on characterization results, we found that in the first step of nonthermal plasma treatment under argon–water, the proportion of terminal OH groups (ter-OH groups) evidently increased. Following the introduction of Na and Pt, the relative abundance of doubly bridged OH groups connecting C and Na (briNa–C-OH groups) and Pt2+ species also increased in the second step of nonthermal plasma reduction under argon, resulting in enhanced HCHO catalytic oxidation capability through a rapid reaction pathway ([HCOO−] + [OH]a → CO2 + H2O). Compared with the catalyst prepared via nitric acid oxidation and thermal deposition (Pt/Na/AC (H&T)), more Pt–Ox–Na species and surface OH groups were obtained on the Pt/Na/AC (P&P) catalyst, which not only reduced Pt consumption but also improved HCHO catalytic activity with around 100% conversion of HCHO to CO2 at 25 °C, while the Pt/Na/AC (H&T) catalyst only achieved 70% conversion. This work thus provides a new strategy for HCHO oxidation at room temperature and a novel perspective on the environmentally friendly synthesis of effective noble catalysts.
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高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 1
·1-11
·
IF 5.3
Zhang Junli,Zhao Yanyan,Hu Haiying,Lv Min,Zhang Hongling
A nano-enzyme sandwich assay (SWzyme assay), a colorimetric system based on a biochip and inorganic nano-enzyme for rapid and simple determination of exosomal Aβ42 in plasma is proposed. Anti-CD63 antibody-modified biochips were prepared for plasma exosome capture and synthesized highly catalytic Ni@Pt nanozymes for detecting exosomal Aβ42. The method was able to detect exosomal Aβ42 with a limit of detection (LOD) as low as 4.2×10 4 particles/mL and a linear range from 10 4 to 10 8 particles/mL. By determination of exosomal Aβ42, the SWzyme assay successfully distinguished plasma from Alzheimer’s desease (AD) and healthy mice. The SWzyme assay holds promise to serve as diagnostic tools for the early detection of AD and supporting the development of personalized medicine. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）