ChemSusChem
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2022
·Vol. 16
·期 7
·e202201892
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IF 9.14
Zemian Ma,Xueying Ma,Wei Luo,Yimin Jiang,Wei Shen,Rongxing He,Ming Li
Graphical Losing it : A catalyst surface self-etching strategy is suggested to construct the high-performance V−CoCH catalyst for the overall water splitting. With the easy and partial dissolution of V species in the early stages of the oxygen evolution reaction, a large number of active sites and oxygen vacancies are generated, and the electrochemical activity is improved significantly. Herein, vanadium-doped cobalt carbonate hydroxide, V−CoCH, was synthesized as efficient catalyst for water splitting. Vanadium species were partially dissolved in the early stages of the oxygen-evolution reaction (OER), inducing self-etching of the catalyst surface, which is helpful for catalyst surface reconstruction and resulted in a higher number of active sites and oxygen vacancies. The synergy between V-doping and oxygen vacancies improved the catalytic activity: V−CoCH showed an exceptional OER catalytic performance with an overpotential of 183 mV at 10 mA cm −2 . The water-splitting cell consisting of V−CoCH only required 1.52 V to reach 10 mA cm −2 . Theoretical calculations revealed that vanadium in V−CoCH played an important role in electron regulation of active sites. The oxygen vacancies had an important effect on improvement of the OER performance through not only the exposure of more active sites but also through modulation of the electronic structure. This work provides an effective strategy for constructing high-performance electrocatalysts.
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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产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2019
·Vol. 21
·期 45
·6935-6944
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IF 3.382
Qunling Fang,Yuhang Sun,Jinyu Duan,Linfeng Bai,Kezhu Xu,Qinshan Xiong,Huajian Xu,Ken Cham-Fai Leung,Ailing Hui,Shouhu Xuan
Metal–organic framework (MOF)-derived nanostructures exhibit wonderful characteristics and possess broad application potential by modulating the complex composition and inner nanostructure. Although various MOF-based nanocomposites have been successfully developed, a facile method that can easily modulate the structure-dependent chemical components of the MOF-derived hybrids remains a challenge. By coating zeolitic imidazolate framework-8 (ZIF-8) with Au/polydopamine (Au/PDA) via in situ redox-oxidation polymerization of HAuCl4 and dopamine, it was found that the ZIF-8 templates were simultaneously etched off to give Au/PDA hybrid microcapsules with a cubic shape. This one-step sacrificial templating process followed a competing chelation between gold ions and Zn2+ cations to 2-methylimidazole and PDA; thus, both the hollow and the yolk-like hybrid cubic microcapsules were controllably obtained by varying the synthetic dynamics. Owing to the hollow nature, penetrated PDA shell, well-distributed Au nanocrystals, and unique stable nanostructure, the non-spherical Au/PDA hybrid cubic microcapsules showed high performance in catalyzing the reduction of 4-nitrophenol as well as adsorption/release of ibuprofen as a model drug. Moreover, this simple strategy offers a controllable design in developing multifunctional nanocomposites with definite inner nanostructures and activities for nanocatalysis, drug delivery, energy storage etc.
研究领域:
材料科学
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纳米技术
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催化化学
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药物递送
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Tingjin Jiang,Yang Wang,Zichang Guo,Haopeng Luo,Chuanxiang Zhan,Yaojin Wang,Zhe Wang,Fang Jiang,Huan Chen
Piezoelectric catalysis based on the polarization of piezoelectric materials is a promising technology for environmental pollutant treatment. Developing effective piezoelectric catalysts and clarifying the reaction mechanism are crucial to the application of piezoelectric catalysis. Herein, a unique strategy of photochemical self-etching of Bi 25 FeO 40 was used to prepare a piezoelectric catalyst of Bi 25 FeO 40 /Bi 2 O 2 CO 3 . During the photochemical process, methanol was oxidized to formaldehyde, and then Bi species on the surface of Bi 25 FeO 40 reacted with formaldehyde to form Bi 2 O 2 CO 3 . As a lead-free piezoelectric catalyst, the Bi 25 FeO 40 /Bi 2 O 2 CO 3 composite possessed excellent activity for the degradation of 4-chlorophenol under ultrasonic vibration, and the degradation efficiency was more than 90% within 120 min. Introducing Bi 2 O 2 CO 3 onto the surface of Bi 25 FeO 40 can significantly promote the piezoelectric catalytic activity of Bi 25 FeO 40 via the effect of built-in electric fields. It was also found that ·OH and ·O 2 − are the main active species that are responsible for the degradation of 4-CP. The results that are presented here can extend the piezoelectric application of bismuth ferrate , and the strategy for building up the heterojunction is helpful for the preparation of other Bi-containing piezoelectric catalysts.
研究领域:
环境科学
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催化材料科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
·
IF 8.4
Xinxin Wei,Xuelin Wang,Kaiming Fan,Yanling Liu,Shengji Xia
The acid-accepting and gas-generating properties, along with the formation of extensive nanovoids, make CaCO 3 nanoparticles attractive as sacrificial nanofillers for fabricating thin-film composite (TFN) nanofiltration membranes. However, challenges such as severe agglomeration and limited acid etching efficiency of the nanoparticles hinder the pursuit of superior membrane performance. In this study, the dispersion and compatibility of CaCO 3 nanoparticles within the membrane matrix were improved by modifying them with a polydopamine (PDA) coating. The abundant phenolic hydroxyl groups of PDA enhanced the hydrophilicity and negative charges of membrane surface. Additionally, the PDA capsule increased the etching extent of the CaCO 3 nanoparticles by improving the nanoparticle dispersion and generating additional acid, which created sufficient water channels within the polyamide layer. It was demonstrated that incorporating 45 μg/cm 2 of PDA-modified CaCO 3 nanoparticles doubled the water permeance to 16.7 LMH/bar, while maintaining a low molecular weight cut-off of 249 Da and achieving rejections over 90 % for five types of per- and polyfluorinated substances. The PDA modification also overcame the membrane stability issue caused by the agglomerated CaCO 3 nanoparticles. This study provides a novel strategy for applying properly modified self-etching nanofillers in TFN membrane development, showing great potential for water treatment applications.
研究领域:
材料科学
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环境工程
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水处理技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Chen Chen,Xianzhuo Lao,Junlong Li,Yidian Wang,Kuikui Wang,Dongxiang Li,Peizhi Guo
Pd-based nanocatalysts hold significant promise for application in alkaline direct ethanol fuel cells (DEFCs). To address the challenges of low Pd atom utilization and poor reaction kinetics in conventional Pd-based catalysts, a self-etching strategy has been developed to synthesize Pd3Pb1 nanoparticles (NPs) with tunable size and abundant tensile strain. The nanoparticles demonstrated a markedly enhanced electrocatalytic performance. Pd3Pb1 NPs-1 exhibited a current density of 2565 mA mgPd–1 for the ethanol oxidation reaction (EOR). Following self-etching, smaller Pd3Pb1 NPs-2 were synthesized, achieving a higher current density of 2820 mA mgPd–1 for EOR. Even after prolonged cyclic voltammetry (CV) testing, the Pd3Pb1 NPs-2 exhibited excellent stability. The high mass activity is attributed to a favorable balance between active intermediates and blocking species at the catalyst interface. This work presents a promising strategy for constructing nanocatalysts with tunable alloying degrees, offering highly efficient catalysts for fuel cell applications. Moreover, this study provides a reliable approach to preparing monodisperse nanocatalysts with controllable size and morphology through self-etching techniques.
研究领域:
材料科学
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催化化学
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能源科学
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DOI
PubMed
高影响因子
JOURNAL OF DENTISTRY
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2025
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IF 5.5
Bing Liang,Xiaolu Chen,Yi Sun,Xinni Pan,Ye Lin,Qi Gao,Yuedan Xu,Ling Zhang
Objectives The study investigated the biomimetic mineralization effect of a self-etch adhesive loaded with amorphous fluorinated calcium phosphate (AFCP) nanoparticles. Methods In this study, fluoride was applied to synthesize AFCP nanoparticles, which were characterized by high resolution transmission electron microscope, selected area electron diffraction and Fourier-transform infrared spectroscopy. Subsequently, the self-etch adhesive (Clearfil S3 Bond) was mixed throughly with 20 wt% of AFCP. The single-layer reconstituted collagen fibrils and demineralized dentin were used to investigate the mineralization effects of AFCP nanoparticles as well as Clearfil S3 Bond loaded with AFCP. Moreover, the Cell Counting Kit-8 assay was conducted to evaluate the cytotoxicity of AFCP-loaded adhesive. Results The AFCP nanoparticles were successfully synthesized and characterized as an amorphous phase, which demonstrated better effectiveness in collagen fibril mineralization compared to amorphous calcium phosphate nanoparticles. Both AFCP nanoparticles and adhesive loaded with AFCP induced intrafibrillar mineralization of single-layer collagen fibrils. The incorporation of AFCP nanoparticles into adhesive led to the formation of remineralized crystals within the demineralized dentin. Moreover, cytotoxicity tests confirmed the biocompatibility of the AFCP-loaded adhesive. Conclusions The incorporation of AFCP nanoparticles into the self-etch adhesive facilitated collagen fibril mineralization and remineralization of demineralized dentin. Clinical Significance Incorporating fluoride, a commonly used anti-caries element, into the self-etch adhesive in the form of AFCP nanoparticles enables its biomimetic mineralization in restorative treatments, presenting a potential approach for developing a novel adhesive system to prevent dental caries clinically.
研究领域:
牙科材料学
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生物医学工程
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口腔医学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2017
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IF 7.504
Zhifang Wu,Xiaokan Wang,Zhe Wang,Changyu Shao,Xiaoting Jin,Leiqing Zhang,Haihua Pan,Ruikang Tang,Baiping Fu
Lab biomineralization should be carried out in an actual clinical practice. This study evaluated self-etch adhesive as a carrier for amorphous calcium phosphate (ACP) nanoprecursors to continuously deliver biomimetic remineralization of self-assembly type I collagen and demineralized dentin. Si-containing ACP particles (Si-ACP) stabilized with polyaspartic acid (PAsp) were synthesized and characterized by transmission electron microscopy (TEM), scanning electron microscopy–energy-dispersive X-ray spectroscopy, Fourier transform infrared analysis, X-ray powder diffractometry, and X-ray phototelectron spectroscopy. The biomimetic remineralization of single-layer reconstituted type I collagen fibrils and demineralized dentin was analyzed by using two one-bottle self-etch dentin adhesives (Clearfil S3 Bond (S3), Kurraray-Noritake; Adper Easy One (AEO), 3 M ESPE) as a carrier loaded (or not, in the case of the control) with 25 wt % of Si-ACP particles. In vitro cytotoxicity assessed by the Cell Counting Kit-8 indicated that the Si-ACP particles had no adverse effect on cell viability. The capacity for Ca and P ions release from cured Si-ACP-containing adhesives (S3, AEO) was evaluated by inductively coupled plasma-atomic emission spectrometry, revealing the successively increasing release of Ca and P ions for 28 days. The intra- and extrafibrillar remineralization of type I collagen and demineralized dentin was confirmed by TEM and selected-area electron diffraction when the adhesives were used as a carrier loaded with Si-ACP particles. Therefore, we propose self-etch adhesive as a novel carrier for ACP nanoprecursors to continuously deliver biomimetic remineralization.
研究领域:
牙科材料
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生物材料
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生物矿化
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修复牙科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）