ChemSusChem
·
2013
·Vol. 6
·期 10
·1945-1951
·
IF 7.475
Wenjin Wang,Jie Zhang,Shengchun Yang,Bingjun Ding,Xiaoping Song
Graphical Not just another brick in the wall: Brick-like Au@Pd core–shell nanobricks (CNBs) with a concave surface were synthesized through a one-pot procedure, and show an enhanced performance towards ethanol electrooxidation. The improved performance of the CNBs is a result of the exposed stepped surfaces, high-index facets, and the synergistic effects of the core and shell metals. Au@Pd core–shell nanobricks (CNBs) with concave surfaces and Pd shells with a thickness of approximately 5 nm were synthesized by co-reduction of HAuCl 4 and H 2 PdCl 4 in the presence of Au seeds and Ag ions. These as-synthesized concave CNBs exhibit significantly enhanced catalytic activity for the electrooxidation of ethanol in alkaline media compared to the commercially-used Pd black. The improved performance of the Au@Pd CNBs can be attributed to the exposed stepped surfaces, high-index facets, and the synergistic effects of the core and shell metals.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 35
·355402
·
IF 3.874
Hongjing Wang,Tongqing Zhou,Qiqi Mao,Shengqi Wang,Ziqiang Wang,You Xu,Xiaonian Li,Kai Deng,Liang Wang
Tuning the composition and surface structure of the metal nanocrystals offered viable avenues for enhancing catalytic performances. Herein, we report a facile one-pot strategy for the formation of PdAg porous alloy nanostructures (PANs) with a concave surface. Due to their highly open nanostructures and tunable d-band center features, PdAg PANs exhibit superior electrocatalytic activity and long-term durability than Pd nanoparticles (NPs) and Pd/C for methanol oxidation reaction (MOR) in alkaline media. Our results provide a feasible and efficient approach for the controlled synthesis of high-performance Pd-based nanomaterials for alkaline MOR.
研究领域:
材料科学
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化学
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2025
·
IF 6.3
Xinyang He,Ying Tian,Weiwei Lu,Fangfen Jing,Mingzhu Jin,Jiahui Zhu,Qi Fong,Rongtai Yu
Background The widespread presence of antibiotics in aquatic environments poses severe ecological risks due to inadequate removal in conventional wastewater treatment. This study investigates morphology-controlled concave polymer nanospheres for simultaneous tetracycline (TC) degradation and photocatalytic H 2 O 2 production. Methods Synthesis of aminophenol-formaldehyde resins (APF) using 3-aminophenol (3-AP), ammonia water, and formaldehyde. Through precise acetone-mediated etching, three concave resin catalysts with distinct concavities (70–78 nm) and wall thicknesses (47–54 nm) were synthesized. Significant findings Systematic characterization revealed that increased wall thickness enhanced visible-light absorption (up to 700 nm), while higher concavity improved light reflection efficiency. The catalyst synthesized with 38 mL acetone demonstrated optimal H 2 O 2 yield (168.5 mg g⁻¹), whereas the maximum TC degradation efficiency (106.57 % at 180 min) was achieved using the 32 mL acetone-etched catalyst with the deepest concavity. Mechanistic studies identified synergistic effects between light scattering geometry and charge carrier dynamics, where concave structures facilitated multi-directional photon utilization while thickened walls suppressed electron-hole recombination. This work provides new insights into morphology engineering for dual-functional photocatalytic systems in environmental remediation.
研究领域:
环境科学
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材料科学
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光催化技术
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产品关联
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Jianzhou Wu,Xiaoyi Chen,Jie Fan,Yongsheng Guo,Wenjun Fang
In spite of the advances in understanding how to prepare concave Pd nanocubes, the quantitative measurement on how the salt precursor reduction process impacts the product is still concealed. Herein, concave Pd nanocubes in distinct concavities have been prepared with an insight mechanistic study. Through the seed-mediated growth method, on the basis of as-synthesized cubic seeds of different sizes and by controlling the concentration of KOAc, the reduction rate of the Pd precursor is manipulated and the morphologies of concave nanocubes are regulated. The growth pathway of concave nanocubes from nanocubes can be divided into two stages, a nonselective growth period, where the growth rate of corners and edges are in balance, and a corner-specialized growth period, where corners are the main growth sites. The reduction kinetics of the Pd precursor has been discussed with the approximation for the reduction as a first-order reaction. It is found that the reduction rate constant of the precursor should be within an appropriate range to prepare Pd CNCs with controlled concavities. The fast precursor reduction process leads to the formation of concave cubes with low concavity, and the generation of small nanoparticles is prioritized.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Chen Fanpeng,Li Li,Cheng Chuanqi,Yu Yifu,Zhao Bo-Hang,Zhang Bin
Electrocatalytic semihydrogenation of acetylene (C 2 H 2 ) provides a facile and petroleum-independent strategy for ethylene (C 2 H 4 ) production. However, the reliance on the preseparation and concentration of raw coal-derived C 2 H 2 hinders its economic potential. Here, a concave surface is predicted to be beneficial for enriching C 2 H 2 and optimizing its mass transfer kinetics, thus leading to a high partial pressure of C 2 H 2 around active sites for the direct conversion of raw coal-derived C 2 H 2 . Then, a porous concave carbon-supported Cu nanoparticle (Cu-PCC) electrode is designed to enrich the C 2 H 2 gas around the Cu sites. As a result, the as-prepared electrode enables a 91.7% C 2 H 4 Faradaic efficiency and a 56.31% C 2 H 2 single-pass conversion under a simulated raw coal-derived C 2 H 2 atmosphere (~15%) at a partial current density of 0.42 A cm −2 , greatly outperforming its counterpart without concave surface supports. The strengthened intermolecular π conjugation caused by the increased C 2 H 2 coverage is revealed to result in the delocalization of π electrons in C 2 H 2 , consequently promoting C 2 H 2 activation, suppressing hydrogen evolution competition and enhancing C 2 H 4 selectivity.
研究领域:
化学工程
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材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 18
·5879-5886
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IF 7.367
Xiaolin Kang,Qifeng Ruan,Han Zhang,Feng Bao,Jun Guo,Minghua Tang,Si Cheng,Jianfang Wang
Concave nanocrystals usually exhibit a large electromagnetic-field enhancement and superior catalytic performance due to their sharp corners, negative curvature and high-index facets. Conventional gold bipyramids (AuBPs) possess intriguing plasmonic properties which are attractive for various applications while the surface curvature of the reported bipyramids has not been fine-tuned to concave or convex structures to date. Additionally, the longitudinal surface plasmon resonance (LSPR) wavelengths of conventional AuBPs are mostly located in the range of 650–1350 nm and the sizes of these nanoparticles are usually not beyond 350 nm, which are not facilitated to some nano-focusing and nanophotonic applications. Herein, we reported a facile and robust approach for fabricating concave AuBPs (CAuBPs) with multiple high-index facets which are distinct from the conventional AuBPs and nanojavelin structures. The length of the as-prepared CAuBPs can even extend up to 800 nm. The CAuBP nanoparticles exhibit a strikingly pronounced broader plasmonic tuning range (even exceeding 1800 nm) and provide much higher electromagnetic-field enhancements in comparison to the conventional AuBPs, which broaden the promising applications of CAuBPs for many single-particle analyses. More importantly, the surface-enhanced Raman scattering (SERS) signals of CAuBPs on the single-particle or aqueous solution both displayed an enhanced intensity compared to conventional AuBPs. The CAuBP nanoparticles also exhibited improved catalytic activity due to the incredible abundance of uncoordinated atoms as active sites.
研究领域:
纳米材料学
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光学
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催化化学
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产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 6
·e202102642
·
IF 9.14
Lingling Zheng,Yingji Zhao,Hongjuan Zhang,Wei Xia,Jing Tang
Graphical There's no space : Highly dispersed Fe−N x anchored on concave N-doped carbon is synthesized by space-confined strategy. The resulting NC@Fe−N−C exhibits superior oxygen reduction activity, originating from the combination of intrinsic activity and acceleration of mass electron transfer. Carbon-based electrocatalysts with atomically dispersed Fe−N−C display promising performance for oxygen reduction reaction (ORR) amongst non-precious electrocatalysts. Nonetheless, increasing the number and utilization of Fe−N−C active sites is challenging. Designing morphologies and adjusting the pore structure of carbon-based electrocatalysts would boost the mass transfer, enhance the utilization of the active sites, and increase the overall ORR performance. In this work, a concave N-doped carbon cubes structure adorned with highly external Fe−N x was designed and produced by the space-confined induced strategy. The optimal electrocatalyst revealed excellent ORR activity in both alkaline and acidic electrolytes, with half-wave potentials of 0.86 and 0.75 V, respectively. The superior performance arose from its unique concave structure, possessing more accessible active sites with improved intrinsic activity, which holds promising potential for preparing advanced ORR electrocatalysts.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2015
·Vol. 26
·期 50
·505401
·
IF 3.821
Lingyu Tan,Lidong Li,Yi Peng,Lin Guo
Herein, a new type of uniform and well-structured Au@Pt bimetallic nanoparticles (BNPs) with highly active concave Au nanocuboids (NCs) as seeds was successfully synthesized by using the classic seed-mediated method. Electrochemical measurements were conducted to demonstrate their greatly enhanced catalytic performance in the ethanol oxidation reaction (EOR). It was found that the electrochemical performance for Au@Pt BNPs with the concave Au NCs as seeds, which were enclosed by {611}high-index facets, could be seven times higher than that of the Au@Pt bimetallic nanoparticles with regular spherical Au NPs as seeds. Furthermore, our findings show that the morphology and electrocatalytic activity of the Au@Pt BNPs can be tuned simply by changing the compositional ratios of the growth solution. The lower the amount of H2PtCl6 used in the growth solution, the thinner the Pt shell grew, and the more high-index facets of concave Au NCs seeds were exposed in Au@Pt BNPs, leading to higher electrochemical activity. These as-prepared concave Au@Pt BNPs will open up new strategies for improving catalytic efficiency and reducing the use of the expensive and scarce resource of platinum in the ethanol oxidation reaction, and are potentially applicable as electrochemical catalysts for direct ethanol fuel cells.
研究领域:
材料科学
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纳米技术
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电化学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
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2012
·Vol. 14
·期 11
·3197-3203
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IF 6.32
Haidong Zhao,Shengchun Yang,Hongjun You,Yanfu Wu,Bingjun Ding
This paper reports the synthesis of platinum concave nanoparticles (NPs) using a freshly-made or recycled KNO3–LiNO3 molten salt (MS). The products obtained from the freshly-made and four-times recycled MSs have similar size and morphology distributions, indicating that the MS can be recycled and reused without any detrimental effect on the character of the particles. Noticeably, no organic capping agents are used in the reaction system. Therefore the as-prepared NPs have a very “clean” surface. Furthermore, the exposed surface steps and high index facets existing on the edges of the as-prepared Pt concave NPs enable them to exhibit a much enhanced electrocatalytic oxidation performance toward methanol. Thus, the MSs have potential to be used as green solvents for the preparation of surfactant or capping agent-free platinum nanostructures.
研究领域:
纳米材料化学
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电催化
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绿色溶剂合成
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无机功能材料
·
能源材料
✓ 已验证
DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2016
·
IF 1.947
Shuang-Shuang Chen,Xue-Min Lu,Qing-Hua Lu
In order to understand how cells respond to concave and convex subcellular surface structures, colloidal crystal array and honeycomb-structured surfaces composed of highly ordered hexagonal units with completely inverse curvature were fabricated via facile self-assembly and breath figure approaches, respectively. The influence of hexagonal surface curvature on cell fate was subsequently investigated. Cells underwent more extensive spreading on the convex colloidal crystal array surface, while adhesive forces were higher on the concave honeycomb surface. The behaviors of cells on the different surfaces were investigated by comparing cell morphology, cellular adhesive force and cytoskeleton structure. The results revealed comprehensive differences in cell behavior between those on concave honeycomb surfaces and convex colloidal crystal arrays.
研究领域:
细胞生物学
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生物物理学
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材料科学
✓ 已验证
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
·
IF 15.7
Zhou Jiayi,Gao Yuzhe,Zhang Deyi,Ren Kexin,Dai Mengqi,Wang Huan,Qi Limin
Chiral plasmonic nanomaterials have attracted significant attention due to their fascinating chiroptical properties and promising applications including chiral sensing, asymmetric catalysis, biomedicine, and chiroptics. Self-assembly of plasmonic nanoparticles is promising for constructing chiroplasmonic nanomaterials, but it remains challenging to obtain homochiral assemblies with high optical asymmetry. Here, gold nanodumbbells featuring a concave morphology are employed as achiral building blocks for controllable self-assembly into stable homochiral assemblies exhibiting strong chiroptical activity. The formation of helically stacked side-by-side assemblies with right handedness is triggered by introducing bovine serum albumin as the chiral additive. Remarkably, an asymmetry factor as high as 0.23 is obtained for the chiral assemblies. It is revealed that the concavity of the nanodumbbells considerably enhances the chirality and stability of the assemblies. Furthermore, the chiral assemblies are utilized as hosts for achiral fluorescent species to generate circular polarization luminescence. This work may advance the structural design of building blocks for chiral assembly toward novel chiroplasmonic nanomaterials.
研究领域:
纳米技术
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材料科学
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物理化学
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光学
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化学合成
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 11
·2300347
·
IF 15.1
Yi Pan,Chang Li,Xiaoyu Hou,Zhenyu Yang,Mingzhu Li,Ho Cheung Shum
Stimuli-responsive structural coloration allows the color change of soft substrates in response to environmental stimuli such as heat, humidity, and solvents. Such color-changing systems enable smart soft devices, such as the camouflageable skin of soft robots or chromatic sensors in wearable devices. However, individually and independently programmable stimuli-responsive color pixels remain significant challenges among the existing color-changing soft materials and devices, which are crucial for dynamic display. Inspired by the dual-color concavities on butterfly wings, a morphable concavity array to pixelate the structural color of two-dimensional photonic crystal elastomer and achieve individually and independently addressable stimuli-responsive color pixels is designed. The morphable concavity can convert its surface between concave and flat upon changes in the solvent and temperature, accompanied by angle-dependent color-shifting. Through multichannel microfluidics, the color of each concavity can be controllably switched. Based on the system, the dynamic display by forming reversibly editable letters and patterns for anti-counterfeiting and encryption are demonstrated. It is believed that the strategy of pixelating optical properties through locally altering surface topography can inspire the design of new transformable optical devices, such as artificial compound eyes or crystalline lenses for biomimetic and robotic applications.
研究领域:
材料科学
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光学
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机器人学
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仿生学
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纳米技术
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软物质物理
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显示技术
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防伪技术
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密码学
✓ 已验证
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）