Matter
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2024
·
IF 17.3
Youbing Li,Shuairu Zhu,Jia-Bo Le,Jun Lu,Xue Wang,Lu Chen,Haoming Ding,Ke Chen,Mian Li,Shiyu Du,Hui Wang,Runnan Zhang,Per O.Å. Persson,Lars Hultman,Per Eklund,Yongbo Kuang,Zhifang Chai,Qing Huang
M n+1 AX n (MAX) phases have attracted significant attention due to their structural diversity and potential applications. Designing MAX phases with single-atom-thick A layers featuring 4d/5d-orbital electronic elements is interesting work. Here, we present a comprehensive report on noble metal-based M 2 (A 1- x A′ x )C (M = V, Ti, Nb; A = Al, Sn, In, Ga, Ge; A′ = Ru, Rh, Pd, Ir, Pt, Au and combinations thereof; 0 < x ≤ 0.4) phases featuring A sublayers of 4d/5d-orbital electronic elements through an A-site alloying strategy. The chemical composition of MAX phases can be adjusted by selecting different M- and A-site elements, with morphology tailored by distinct C sources. Furthermore, the V 2 (Sn 0.8 Pt 0.2 )C (15.7 wt % Pt) catalyst showed better performance for hydrogen evolution reaction compared to the commercial Pt/C (20 wt % Pt) electrode. This study highlights the prospects of A-site alloying for the design of novel MAX phases with unique properties and promising applications in electrocatalysis and beyond.
研究领域:
材料科学
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化学工程
·
电化学
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DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Bolin Wang,Yuxue Yue,Yuliang Li,Lu Yu,Hong Tang,Haifeng Zhang,Feng Feng
Imidazolium-based ionic liquid mixtures with [NO3]− and [AlCl4]− anions were used as oxidizing agents for the dissolution of Au, Pd, and Pt metals under mild conditions. The thermodynamic reduction of [NO3]− to [NO] is catalyzed by [AlCl4]− anions and coupled with the oxidation process of noble metals. The developed ionic liquid system for dissolving Au can reactivate the Au0 formed in the deactivation process of the catalyst in vinyl chloride production. This demonstrates the relevance of the here-presented work for technical noble metal recycling.
研究领域:
化学
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材料科学
·
环境科学
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DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 55
·33444-33449
·
IF 3.119
Jun Liu,Xue Zhao,Haibo Zhang
Today, metal-based nanomaterials play an increasingly important role in the energy, environment, medical and health fields. In order to meet the needs of various fields, it is necessary to continuously develop advanced technologies for preparing metal-based materials. Inspired by previous research, the results of a proof-of-concept experiment show that the hexahydro-closo-hexaborate anion (closo-[B6H7]−) in the borane cluster family has properties similar to NaBH4. Closo-[B6H7]− can not only convert common precious metal ions such as Au3+, Pd2+, Pt4+ and Ag+ to the corresponding zero-valence state, but also convert some non-precious metals such as Cu2+ and Ni2+ to the zero-valent or oxidation state. Closo-[B6H7]− moderate reduction to cause rapid aggregation of metal-based materials is not easy compared with NaBH4. Compared with closo-[B12H12]2−, closo-[B6H7]− achieves the conversion of Pt4+ to Pt0 under ambient conditions, and its reduction performance extends to non-precious metals. The excellent stability and easy modification characteristics determine the universality of the closo-[B6H7]− reduction strategy for metal ions.
研究领域:
材料科学
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化学
·
能源与环境科学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Taotao Cai,Ying Zhang,Shili Zheng,Longkai Liu,Yi Zhang,Bin Yu
V Al master alloys are essential raw materials for producing high-quality titanium alloys, which are generally produced by aluminothermic reduction, metal-slag gravitational separation method. The conventional way faces the challenges of excessively high reaction temperatures, metallic inclusions in slag, and difficulties in fabricating higher-Al-content alloy in one step. To conquer these issues, this research has reported a new method to precisely fabricate V Al master alloy with a designated composition, which is an aluminum reduction coupled with an acid leaching process. The reduction byproduct of weak-acid-soluble calcium aluminate, the critical parameters for Al reduction, and the reaction routes are determined. This research has demonstrated that various V Al master alloys (expressed as AlV x ) are successfully prepared by heating the optimal mixture of V 2 O 3 + (2 + 2 x -)/ x Al + 2.0CaO + 1.35CaCl 2 (in molar ratio) at 1000 °C for 5 h in Ar and pickling the reduction material using HCl acid with pH controlled at 1.2. Oxygen in 6Al4V, 4Al6V, and 2Al8V alloy powders are 400 ppm, 500–700 ppm, and 1800–2000 ppm, respectively. The 4Al6V powder produced by this reported method is compared with the commercial one, with comparable phase and chemical compositions but with finer sizes preferred in powder metallurgy sintering. The main reactions or phase changes that happen during heating include stepwise removal of surface and crystalline water from CaCl 2 , melting of Al, reaction between V 2 O 3 and CaO, melting of CaO-CaCl 2 binary compound, and Al reduction reaction. The method developed in this study can also be used to prepare other alloys, such as Ti Al and Ti Fe alloy powders.
研究领域:
材料科学
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冶金工程
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DOI
高影响因子
MATERIALS LETTERS
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2011
·
IF 2.12
Youwei Chen,Wei Guo Wang,Shenghu Zhou
Au–Pt bimetallic nanoparticles (NPs) were synthesized by a seeded growth method. Au NPs with different sizes were obtained by reducing HAuCl 4 with butyllithium, and AuPt bimetallic NPs were synthesized by reducing H 2 PtCl 6 with oleylamine using the pre-synthesized Au NPs as seeds. The size of Au seeds was found to be a key factor on the structure of Au–Pt bimetallic NPs. Using big Au NP seeds (8 nm or 12 nm) resulted in the formation of Au–Pt dendritic structures. While relatively small Au NPs (3 nm) were used as seeds, the fast atomic diffusion inside relatively small bimetallic NPs will result in an Au–Pt alloy formation.
研究领域:
纳米材料科学
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化学合成
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材料表征
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
·
IF 4.939
Caijun Ma,Jiachao Duan,Yan Fu,Jie Chang
The metal organic frameworks (MOFs) supported Pd catalysts for H 2 generation from formic acid (FA) were synthesized in this work, via a facile excessive impregnation-low temperature reduction approach. Among the synthetic catalysts, 10% Pd/MOF-Cr (18) displayed a remarkable performance for catalyzing FA dehydrogenation in additive-free aqueous solution, and the corresponding TOF mid achieved 537.8 h −1 at 323 K. Furthermore, the bimetallic Ni–Pd alloy catalysts were prepared by the introduction of Ni in the subsequent work. Fortunately, 10% Ni 0.4 Pd 0.6 /MOF-Cr was found to be a highly active and fairly durable catalyst, exhibiting a TOF mid as high as 737.9 h −1 at 323 K with almost 100% X FA (final) and S H2 , and remained 94% of its original activity in the third cyclic catalysis. Meanwhile, Ni was discovered to be indispensable in increasing the electron density of Pd, downsizing the immobilized metal particles and inhibiting the agglomeration of the loaded nanoparticles .
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 11
·2207
·
IF 4.324
Wan-Cheng Zhang,Meng-Dai Luoshan,Peng-Fei Wang,Chu-Yun Huang,Qu-Quan Wang,Si-Jing Ding,Li Zhou
The self-assembly process of metal nanoparticles has aroused wide attention due to its low cost and simplicity. However, most of the recently reported self-assembly systems only involve two or fewer metals. Herein, we first report a successful synthesis of self-assembled Ag@AuCu trimetal nanoplates in aqueous solution. The building blocks of multibranched AuCu alloy nanocrystals were first synthesized by a chemical reduction method. The growth of Ag onto the AuCu nanocrystals in the presence of hexadecyltrimethylammonium chloride (CTAC) induces a self-assembly process and formation of Ag@AuCu trimetal nanoplates. These nanoplates with an average side length of over 2 μm show a porous morphology and a very clear boundary with the branches of the as-prepared AuCu alloy nanocrystals extending out. The shape and density of the Ag@AuCu trimetal nanoplates can be controlled by changing the reaction time and the concentration of silver nitrate. The as-assembled Ag@AuCu nanoplates are expected to have the potential for wide-ranging applications in surface-enhanced Raman scattering (SERS) and catalysis owing to their unique structures.Keywords:trimetal;self-assemble;nanoplates;AuCu alloy
研究领域:
材料科学
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化学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
·
IF 3.8
Tianci Zheng,Yanfei Zhu,Rui Ma,Liguang Bai,He Yu,Shixi Zhao,Yufei He,Yanan Liu,Dianqing Li
Hydrogenation of unsaturated C≡C groups is a promising way to realize ethylene purification in petrochemical processes and produce value-added products. Gold catalysts are known to exhibit satisfactory selectivity toward olefins. However, it still remains a grand challenge to improve the activity and inhibit the heavy coke effect while balancing the selectivity. This article describes the construction of Cu vacancies at an abrupt surface over a Au–Cu alloy catalyst to effectively promote the activation and dissociation of hydrogen, thereby reducing the activation energy barrier. More importantly, the generation of abundant Cu vacancies contributes to the electronic interaction with the adjacent second metal to generate coordination unsaturated and electron-deficient Au species, which facilitates the desorption of product intermediates. Consequently, the activity and selectivity of the acid-etched Au3Cu1/TiO2 are much higher than those of the untreated Au–Cu and monometallic Au catalysts. This report opens up promising possibilities for engineering highly efficient heterogeneous gold catalysts.
研究领域:
催化化学
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材料科学
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石油化工
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产品关联
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 6
·544
·
IF 4
Tingting Hu,Baozeng Ren,Liang Zhao
Hydrogen peroxide (H2O2) is an important industrial chemical that is widely applied in many areas. The direct synthesis of H2O2from H2and O2has proved to be a green and economic pathway. Pd-based bimetallic catalysts, due to their superior catalytic performances in this reaction, have attracted intensive attention. Herein, Tetrakis(hydroxymethyl)phosphonium chloride (THPC) was adopted as the protective ligand to immobilize Pd-Au alloy nanoparticles onto activated carbon (AC). The varied Pd/Au molar ratios demonstrated homogeneously distributed Pd-Au nanoalloys with average particle sizes ranging from 3.51 to 5.75 nm. The optimal ratio was observed over the Pd3Au1/AC-THPC catalyst with a maximum H2O2productivity of 165 mol/(kgPd·h) and selectivity of 82.3% under ambient pressure. The relationship between the electronic structure and catalytic activity indicated Pd0was the active site, while the presence of Au inhibited H2O2degradation rate. This research could help in the design efficient bimetallic catalysts for the direct synthesis of H2O2.
研究领域:
化学
·
催化材料科学
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产品关联
DOI
高影响因子
TALANTA
·
2025
·
IF 6.1
Xiupei Yang,Ling Jiang,Baowen Zhang,Jie Hu,Xiaoyan Cui,Qian Zhang
Accurate monitoring of copper ions (Cu 2+ ) and lipoic acid (LA), essential trace elements and antioxidants in vegetables, is critical for food safety and human health. Here, we developed mercaptopurine-stabilized gold-silver bimetallic nanoclusters (MP-AuAg NCs) as a fluorescence 'turn-off' probe for Cu 2+ detection, achieving a linear response of 0.05–20 μM with a detection limit of 23 nM (LOD). To enhance sensitivity, a ratiometric probe (Zn MOF@MP-AuAg NCs) was engineered by in situ growth of zinc metal organic frameworks (Zn MOF) in the nanoclusters, which reduced Cu 2+ LOD to 4 nM (linear range: 0.015–0.50 μM). Interestingly, the Cu 2+ quenched system functioned as a 'turn on' sensor for LA detection, offering a dual range response: exponential correlation from 0.3 to 80 μM (R 2 = 0.997) and linear quantification from 0.3 to 25 μM (LOD = 94 nM, R 2 = 0.998). Validated in spinach samples, the method demonstrated exceptional precision (recoveries: 96.5–102 %) and precision (RSD <3.12 %), confirming its reliability for sequential Cu 2+ -LA analysis in complex food matrices. This work establishes a versatile sensing platform with enhanced sensitivity and practical utility for food quality monitoring.
研究领域:
食品科学
·
分析化学
·
生物医学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Yong Xiang,Chang-Yuan Cheng,Meng-Hao Liu,Wen-Cai Bai,Zhou-Xuan Zang,Li Xu,Yi Yu,Guo-Ji Liu
The design of an efficient adsorbent for Au(III) has remained a challenging research focus, as the adsorbent needs to overcome competition from other ions while simultaneously addressing pore blockage caused by the reduction of Au(III) to elemental gold. In this study, we report the synthesis of a hierarchically porous metal–organic frameworks (MOFs) with ultra-large pores (300 nm) using the “MOF in MOF” method. This material facilitates enhanced adsorption kinetics by increasing the rate of gold ion adsorption and effectively prevents pore blockage resulting from Au(III) reduction, enabling access to the majority of adsorption sites. Batch experiments were conducted, and various complex water mixtures, including freshwater, simulated electronic waste solution, and gold ore leachate, were tested to demonstrate the rapid extraction of trace amounts of gold by the developed adsorbent. Remarkably, without additional functionalization, the adsorbent solely based on its pore advantage achieved a gold adsorption capacity of 1184 mg/g and reached 80 % adsorption within just 5 min (C0 = 100 mg/L, V/m = 2 L/g). Furthermore, the gold recovered from the leachate of gold ore exhibited a purity of 23.8 K (99.2 % purity).
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Shi Peng,Qiang Zheng,Xin Zhang,Linghui Dai,Jingxian Zhu,Yanbin Pi,Xiaoqing Hu,Wenqing Cheng,Chunyan Zhou,Yinlin Sha,Yingfang Ao
A disintegrin and metalloproteinase with thrombospondin motif-4 (ADAMTS-4) plays a pivotal role in degrading aggrecan, which is an early event in cartilage degrading joint diseases such as osteoarthritis (OA). Detection of ADAMTS-4 activity could provide useful clinical information for early diagnosis of such diseases and disease-modifying therapy. Therefore, we developed a ADAMTS-4 detective fluorescent turn-on AuNP probe (ADAMTS-4-D-Au probe) by conjugating gold nanoparticles with a FITC-modified ADAMTS-4-specific peptide (DVQEFRGVTAVIR). When the ADAMTS-4-D-Au probe was incubated with ADAMTS-4, the fluorescence recovered and fluorescence intensity markedly increased in proportion to concentrations of ADAMTS-4 and the probe. A nearly 3-fold increase in fluorescent intensity in response to only 3.9 pM of ADAMTS-4 was detected, whereas almost no fluorescence recovery was observed when the probe was incubated with matrix metalloproteinase (MMP)-1, -3, and -13. These results indicate a relative high sensitivity and specificity of the probe. Moreover, ADAMTS-4-D-Au probe was used to detect ADAMTS-4 activity in synovial fluid from 11 knee surgery patients. A substantial increase in fluorescent intensity was observed in the acute joint injury group as compared to the chronic joint injury and end-stage OA groups, indicating that this simple and low-cost sensing system might serve as a new detection method for ADAMTS-4 activity in biological samples and in screens for inhibitors for ADAMTS-4-related joint diseases. Additionally, this probe could be a potential biomarker for early diagnosis of cartilage-degrading joint diseases.
研究领域:
生物医学
·
分子生物学
·
纳米医学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）