Catalysts
·
2019
·Vol. 9
·期 3
·288
·
IF 3.444
Feihu Liu,Zhong Wang,Da Wang,Dan Chen,Fushan Chen,Xuebing Li
The CeO2ordinary amorphous, nanopolyhedrons, nanorods, and nanocubes were prefabricated by the hydrothermal method, and employed as carriers of Fe/W–CeO2catalysts to selectively catalyze the reduction of NO with ammonia. Characterization results indicated that the morphology of CeO2support originated from selectively exposing different crystal surfaces, which has a significant effect on oxygen vacancies, acid sites and the dispersion of Fe2O3. The CeO2nanopolyhedrons catalyst (Fe/W–CeO2–P) showed most oxygen vacancies, the largest the quantity of acid sites, the largest BET (Brunauer-Emmett-Teller) surface area and the best dispersion of Fe2O3, which was associated with predominately exposing CeO2(111) planes. Consequently, the Fe/W–CeO2–P catalyst has the highest NO conversion rate in the temperature range of 100–325 °C among the ordinary amorphous, nanorods, and nanocubes Fe/W–CeO2catalysts.Keywords:morphology;Fe/W–CeO2;nanopolyhedra;CeO2(111) planes
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2025
·
IF 9.7
Sun Haofeng,Wang Minghao,Li Wenjie,Liu Yang,Sun Xinyu,Wang Wenjie,Guo Yuqiao,Xie Yi,Wu Changzheng
Considerable progress has been made in synthesizing two-dimensional (2D) materials by exfoliating layered solids. However, for tremendous non-layered inorganic materials, especially magnet solids, usually with closely packed bulk phases by strong chemical bonds, it is challenging to obtain their high-quality 2D sheets. Herein, we highlighted a new structure of free-standing ferromagnetic nanosheets featuring (111) facets. For magnet, Fe 3 O 4 , its inversed spinel crystalline has limited abilities to exfoliate into 2D forms and rarely exists as free-standing nanosheets owing to aggregation induced by magnetic force. We realized a breakthrough in achieving free-standing ferromagnetic nanosheets with dramatically surpassing size limitations via topotactic conversion from layered counterparts. Our Fe 3 O 4 nanosheets exhibited a maximum width of 60 µm while only ∼4 nm thick, prominently exposing (111) facets. 2D Fe 3 O 4 behaved anisotropic magnetism, which displayed a 4.6 emu g −1 moment ( H =500 Oe) in the (111) plane but 2.1 emu g −1 out of the (111) plane, indicating a (111) in-plane easy axis. We anticipated our topotactic conversion strategy would inspire the creation of 2D non-layered materials and enrich the 2D materials family.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2022
·Vol. 14
·期 1
·1-12
·
IF 23.655
Jiang Yuxin,Chai Liyuan,Zhang Dehe,Ouyang Fangping,Zhou Xiangyuan,Alhassan Sikpaam I.,Liu Sailin,He Yingjie,Yan Lvji,Wang Haiying,Zhang Wenchao
AbstractSection
Highlights
First report of a lithium-ion battery cathode as a deionization electrode for desalination.
A novel approach to suppress manganese dissolution by exposing the (111) facet is proposed.
Excellent desalination performance by the LiMn 2 O 4 /C cathode. The material achieves an ultrahigh desalination capacity of 117.3 mg g −1 at 1.0 V and a longer cycle life (200 cycles without capacity decay) with minor manganese dissolution during the cycling test in 10 mM aqueous LiCl solution.
AbstractSection
Abstract
Battery materials as emerging capacitive deionization electrodes for desalination have better salt removal capacities than traditional carbon-based materials. LiMn 2 O 4 , a widely used cathode material, is difficult to utilize as a deionization electrode due to its structural instability upon cycling and Mn dissolution in aqueous-based electrolytes. Herein, a facile and low-cost ball-milling routine was proposed to prepare a LiMn 2 O 4 material with highly exposed (111) facets. The prepared electrode exhibited relatively low dissolution of Mn during cycling, which shows its long cycle stability. In the hybrid capacitive deionization system, the LiMn 2 O 4 /C electrode delivered a high desalination capacity of 117.3 mg g −1 without obvious capacity decay at a voltage of 1.0 V with a 20 mM initial salt concentration. In addition, the exposed (111) facets significantly alleviated Mn ion dissolution, which also enhanced the structural steadiness.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 99
·97129-97136
·
IF 3.289
Wen-Bei Yu,Zhi-Yi Hu,Ming Yi,Shao-Zhuan Huang,Dai-Song Chen,Jun Jin,Yu Li,G. Van Tendeloo,Bao-Lian Su
Transition metal oxides with exposed highly active facets have become of increasing interest as anode materials for lithium ion batteries, because more dangling atoms exposed at the active surface facilitate the reaction between the transition metal oxides and lithium. In this work, we probed the electrochemical behavior of hollow Cu2O microspheres with {111} and {110} active facets on the polyhedron surface as anodes for lithium storage. Compared to commercial Cu2O nanoparticles, hollow Cu2O microspheres with {111} and {110} active facets show a rising specific capacity at 30 cycles which then decreases after 110 cycles during the cycling process. Via advanced electron microscopy characterization, we reveal that this phenomenon can be attributed to the highly active {111} and {110} facets with dangling “Cu” atoms facilitating the conversion reaction of Cu2O and Li, where part of the Cu2O is oxidized to CuO during the charging process. However, as the reaction proceeds, more and more formed Cu nanoparticles cannot be converted to Cu2O or CuO. This leads to a decrease of the specific capacity. We believe that our study here sheds some light on the progress of the electrochemical behavior of transition metal oxides with respect to their increased specific capacity and the subsequent decrease via a conversion reaction mechanism. These results will be helpful to optimize the design of transition metal oxide micro/nanostructures for high performance lithium storage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 26
·期 7
·5071-5077
·
IF 1.569
Li Anli,Li Pengwei,Hu Jie,Zhang Wendong
Single crystal Cu 2 O materials with morphologies of cube, truncated cube, truncated octahedron, octahedron etc. have been synthesized by a facile glucose reduction method. Polyvinylpyrrolidone concentration dependent, crystal-facet-controllable growth mechanism of the synthesized Cu 2 O crystals has been proposed in the article. The photocatalytic test results show that the octahedral Cu 2 O crystals with dominant {111} planes have super photocatalytic activity than the cubic ones packaged by {100} surfaces, which could be explained by that the polar, highly active {111} facets with unsaturated “Cu” have more excellent activity on the methyl orange dye degradation. This article will contribute to promote the morphology construction and crystal-dependent catalytic properties of metal oxide semiconductor materials.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Bo Zhou,Pei Zhao,Junxue Guo,Shuaifeng Hu,Xin Guo,Jiewei Liu,Can Li
While (111)-dominated perovskite films hold the potential for high-stability solar cells, most studies have primarily focused on modulating the (111) facets, overlooking the distribution and formation mechanism of the nondominant (100) facets. In this study, we delve into the (111) orientation via solvent regulation and investigate the evolution of facet distribution using various diffraction techniques. The findings reveal that simply stacking (111) facets does not inherently enhance solar cells. Instead, the distribution of nondominant (100) facets in (111)-dominated films significantly influences both photoelectric property and stability. These observations highlight the critical need to manage the interplay between dominant and nondominant facets. The study further offers strategies for addressing facet heterogeneity to achieve a uniform facet distribution. This research provides a comprehensive framework for understanding (111)-dominated perovskites and offers valuable guidance for designing high-performance perovskite solar cells.
研究领域:
材料科学
·
光伏技术
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 48
·6844-6851
·
IF 2.6
Yuyuan Chen,Yachang Huang,Xia Hu,Sijie Lin,De-Kun Ma
The exposed crystal facets of Cu have a profound effect on its electrocatalytic CO2 reduction reaction (CO2RR) activity and product selectivity. On the other hand, at present, most of the studies on Cu-based electrocatalysts for the CO2RR focus on the synthesis of C2+ products. There are only a few reports involving methanol (CH3OH) generation over Cu nanocrystals. Herein, CuO nanosheets (NSs) and nanorods (NRs) were synthesized through a controlled oxidation and dehydration route under mild reaction conditions, using Cu mesh as a Cu source and conductive substrate, respectively. The as-synthesized CuO NSs and NRs were further converted into Cu NSs and NRs through an in situ electrochemical reduction method, respectively. The experimental results showed that CH3OH could be efficiently produced over Cu NSs with abundant (111) crystal facets through the electrocatalytic CO2RR. The maximum CH3OH faradaic efficiency (FE) obtained on Cu NSs is 68% at a relatively low applied potential of −0.6 V vs. reversible hydrogen electrode (RHE), which is 1.6 times larger than that achieved on Cu NRs with primarily exposed (200) crystal facets (42%). The crystal facet-dependent electrocatalytic CO2RR activity toward CH3OH production was elucidated based on theoretical calculations combined with experimental results.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Dandan Liu,Haiou Liang,Chunping Li,Jie Bai
Photocatalytic water splitting is a prospective strategy to solve the shortage of human fossil fuel energy. In this work, we designed and synthesized the Pt as co-catalyst decorated on TiO 2 nanotubes/metastable zinc-blende (ZB) CdS nanoparticles (NPs) with highly exposed (1 1 1) facets (HPTCA3) via the electrospinning-solvothermal and chemical deposition methods. The H 2 evolution rate of HPTCA3 was 15025.38 μmol·g −1 ·h −1 , which was about 111.3 and 2.4 times stronger than that of pure CdS power and Pt-TiO 2 /CdS hollow nanotubes (HPTC). The XRD patterns showed the presence of acetate promoted the growth of ZB CdS (1 1 1) crystal facets, and the photogenerated electrons were easily tended to accumulate on the CdS (1 1 1) facets, whichwas conducive to the transmission of electrons on the CdS and TiO 2 interface. The type II heterojunction can broaden the visible light response range and accelerate the separation and transfer of photo-generated electrons and holes which can be supported by the Optical and Electrochemical characterizations. Band structure calculations and XPS spectrum indicated that the composite catalyst had an efficient electron transfer mechanism, which was beneficial for the spatial separation of photogenerated carriers. The work provides a rational photocatalyst design to improve the performance of photocatalytic splitting of water into hydrogen.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
·
2023
·Vol. 33
·期 7
·075007
·
IF 2.3
Jianqiang Han,Weihua Sun
Front-side releasing suspended structures made using bulk micromachining processes have the advantages of simplifying vacuum or hermetic packaging processes and reducing squeeze-film damping. This paper studies the effect of doping concentration on the etching rate (ER) of the (111) plane. The experimental results show that increasing the boron doping concentration (but to less than the self-stop etching concentration) significantly increases the ER of the (111) plane and the ER ratio of the (111) and (100) planes. This phenomenon is used to speed up the undercutting and release <110> oriented clamped–clamped beams, which can be used as piezoresistive sensitive elements. The etching depth when the microbeams have just been released and the silicon wedges under single beams, double beams and triple beams disappear is deduced and verified by experiments. This has a certain guiding significance for designing piezoresistive sensors.
研究领域:
微机电系统
·
半导体工艺
·
传感器技术
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Yaqi Qu,Yan Wang,Jianwei Li,Qiuxia Xu,Xin Liang,Angran Jiang
CO coupling to dimethyl oxalate (DMO) has been considered as the most important part in industrial production of ethylene glycol (EG). Five kinds of Pd nanoparticles with various morphologies were successfully synthesized by liquid-phase reduction. The exposed crystal planes of these Pd nanoparticles were identified and quantified. The corresponding supported Pd/α-Al 2 O 3 showed excellent catalytic activities for CO coupling reaction and the catalysts including Pd icosahedra can enhanced the selectivity of DMO to 98% and remained unchanged for 50 hours. The characterization results illustrated that the exposure of Pd (111) facets enhanced the intensities of bridged CO, which contributed to the high performance of the Pd-based catalysts. DFT calculations revealed CO adsorbed on Pd (111) facets had higher binding energies. This work systematically discussed the influence of Pd morphologies. Experimental and theoretical results confirmed that the Pd (111) facets showed better catalytic activities for CO coupling reaction.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Energy Materials
·
2025
·Vol. 5
·期 8
·N
·
IF 11.2
Baoyu Wang,Ximing Yan,Ming Zhou,Hu Li
Lignin-based guaiacol and its derivatives can be hydrogenated to synthesize 2-methoxycyclohexanols (2-MCHs), widely used in the pharmaceutical industry, while the efficient catalytic conversion of guaiacols into 2-MCHs is challenging due to the interference of the side reaction of CAr-OCH3 bond cleavage. In this work, highly selective hydrogenation of various guaiacyl lignin-derived phenols to 2-MCHs (yields of 86%-97%) was realized over a single-atom Ru-based catalyst (Ru1/o-CeO2-ov) that preferentially exposes the CeO2(111) plane and has abundant oxygen vacancies. Control experiments and mechanism studies expounded that Ru-O-Ce is the active site for hydrogenation of aromatic ring in guaiacols, and the exposed (111) plane and abundant oxygen vacancies of ceria can reduce the activation energy of aromatic ring hydrogenation, thereby enabling guaiacols to generate the corresponding hydrogenated products with high selectivity. Response surface optimization experiments indicated that temperature and time have relatively more significant effects on the 2-MCH yield. Moreover, the Ru1/o-CeO2-ov catalyst exhibited excellent reusability, and was extensively applicable to the hydrogenative dearomatization of different types of lignin-derived phenols, providing a unique solution for upgrading biomass feedstock into specific structural chemicals.
研究领域:
催化化学
·
生物质转化
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Da Wang,Ying Zhu,Weiting Yu,Zhiqiao He,Feilong Dong,Yi Shen,Tao Zeng,Xiaohui Lu,Jun Ma,Lizhang Wang,Shuang Song
Ag-based electrodes have emerged as important candidates for the industrial electrochemical CO 2 reduction reaction (eCO 2 RR) to form CO. Herein, an intrinsic versatile Ag electrode has been derived in situ from Ag-MOF on Ag foam (denoted as ER-AF), which exhibits the highest current density (57.2 mA cm −2 ) at a potential of −1.15 V vs. RHE reported to date for the formation of CO in a commonly used H-type cell. ER-AF has multiple-roles: The 3D dendrite structure promotes mass diffusion; the rich edges sites favor CO 2 adsorption and conversion, and the highly exposed (111) facet facilitates the desorption of CO. Their cooperating functions result in the remarkable performance of ER-AF in the eCO 2 RR to form CO. This work offers an effective strategy to achieve high eCO 2 RR activity and selectivity by assembling the active and stable sites together on the MOF-derived materials.
研究领域:
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）