INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2017
·
IF 3.582
Zuohua Liu,Yujie Zheng,Tingting Gao,Jing Zhang,Xuefeng Sun,Guowei Zhou
In this study, anatase TiO 2 nanorods with exposed high-energy {100} and {001} facets and low-energy {101} facets were fabricated in the presence of surfactants cetyltrimethylammonium bromide , didecyldimethylammonium bromide, and ammonia via a facile hydrothermal method without the erosive reagent hydrofluoric acid . The particle size and morphology were mainly tuned by regulating the hydrothermal temperature. When the temperature was increased from 150 °C to 180 °C and 200 °C, the length of the nanorods decreased from 700-1000 nm to 400–500 nm and 100–200 nm, respectively. Concurrently, the edges and tops of the truncated tetragonal pyramid of the TiO 2 nanorods became blurry and flattened. The synthesized typical TiO 2 nanorods were then used as photocatalysts , and their performance during the direct generation of H 2 from water was evaluated. The TiO 2 nanorods obtained at 150 °C successfully produced high amounts of H 2 evolution (281.36 μmol) in the presence of methanol as a sacrificial agent under ultraviolet light irradiation for 4 h. The outstanding photocatalytic activity of the nanorods was mainly ascribed to the formation of surface heterojunctions in the edges and corners between adjacent high-energy {001} or {100} facets and low-energy {101} facets. The formed heterojunctions could facilitate charge separation through preferential carrier flow toward the specific facets.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 14
·8286-8290
·
IF 3.119
Xiaochuan Xu,Haipeng Zhang,Bin Liu,Jianhui Yang
In this work, corolla-shaped gold nanostructures with (110) planes were successfully synthesized using ethylenediaminetetraacetic acid (EDTA) and polyvinylpyrrolidone (PVP) as the co-reductants and shape-directing agents. The structure and the mechanism of the nanostructures were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical characterization. On the basis that surface energies of different gold crystallographic planes are in the order γ(111) < γ(100) < γ(110), the (110) plane has the highest surface energy among the low-index planes. The gold nanocrystals with exposed high-energy planes are important in facilitating their potential applications such as highly efficient catalysts. This research is of great significance for the subsequent work on the synthesis of nanocrystals dominated by high-energy crystal planes.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
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
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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
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2015
·Vol. 26
·期 7
·5071-5077
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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
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xiangge Wang,Xiaoxiao Lu,Wen-Jie Chen,Chunmei Xiao,Miaoling Huang,Xiaoyang Pan,Bo Weng,Shijing Liang
In recent years, piezo-catalytic hydrogen production has been widely investigated for potential applications. Despite various strategies having been utilized to enhance the performance of piezocatalysts, there is a scant report on improving catalytic activity through the modulation of carrier migration pathways. Herein, we have successfully synthesized BiOCl with exposed {001} and {010} facets through facet engineering. The built-in electric field within the BiOCl crystals is oriented perpendicular to the {001} facets and parallel to the {010} facets, leading to differing charge carrier transfer pathways in the two samples. Specifically, in the BiOCl-010 sample, due to the electric field parallel to the nanosheet plane, charge carriers migrate along the x-axis. In contrast, in the BiOCl-001 sample, the electric field is perpendicular to the nanosheet plane, causing charge carriers to transfer along the z-axis, resulting in a shorter charge carrier migration distance. Consequently, BiOCl-001 demonstrates superior piezo-catalytic performance compared to BiOCl-010 toward H2 production and dye degradation. Both samples exhibit identical morphologies and similar energy band structures. Therefore, the enhanced performance is attributed to its shorter charge transport distance as well as the relatively higher piezoelectric coefficient associated with the {001} facets of BiOCl, which facilitates effective carrier separation.
研究领域:
材料科学
·
催化
·
纳米技术
·
环境科学
·
能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 10
·2588-2597
·
IF 5.365
Yuwei Mi,Haiping Li,Yongfang Zhang,Na Du,Wanguo Hou
Crystal facet engineering is one of the most important ways to enhance the photoactivity of photocatalysts, but it remains challenging so far. In addition, the effects of exposed facets and crystallite sizes on the photoactivity of BiOX (X = Cl, Br, or I) nanosheets have been widely investigated. However, it is still unclear which one between the exposed facets and the crystallite sizes is more important for the photoactivity of the BiOX nanosheets. In this work, a series of BiOBr nanosheets with tunable exposed facets and crystallite sizes were solvothermally synthesized in a mixed solvent of n-propanol, water, and acetic acid. The regulation of the exposed facets and crystallite sizes was achieved simply by changing the n-propanol/water volume ratios (Rp/w, 0/30 to 30/0) of the mixed solvent. At low n-propanol contents (Rp/w < 15/15), the obtained BiOBr nanosheets expose dominantly (001) facets, while at high n-propanol contents (Rp/w > 20/10), they expose dominantly (010) facets. With increasing Rp/w, the lateral size and thickness of the BiOBr nanosheets all decrease, from 1700 to 174 nm and from 156 to 17 nm, respectively. The effects of exposed facets and thicknesses of BiOBr nanosheets on the photocatalytic activity, evaluated by degradation of salicylic acid and rhodamine B under visible-light irradiation, were investigated. The exposed facet and thickness of BiOBr nanosheets are both important for their photocatalytic performance. The (001) facets exhibit a higher photocatalytic activity than the (010) facets. For the BiOBr nanosheets with the same (001) or (010) exposed facets, the photocatalytic activity increases with a decrease in their thickness. This study provides a new facile way to adjust the exposed facets and crystallite sizes of BiOX, and the findings may provide guidance for crystal facet engineering of other photocatalysts.
研究领域:
材料科学
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环境科学
✓ 已验证
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Xiaohui Ma,Qixuan Qin,Nan Zhang,Chuan Chen,Xin Liu,Yu Chen,Chuannan Li,Shengping Ruan
Dodecahedron-like SnO 2 nanomaterial was synthesized via a solvothermal method under mild reaction condition. The morphological and structural characterization results indicated that the as-prepare dodecahedral SnO 2 nanocrystallines with the average length of 130 nm and width of 45 nm were partially surrounded by high surface-energy {221} facets. The gas-sensing performance of the sample was investigated and the experiment results showed that the sensor had a good sensitivity to sulfur dioxide (SO 2 ) at 183 °C. To 800 ppb SO 2 , the response could reach 1.32 and the response time was about 10 s. The good SO 2 -sensing performance of SnO 2 nanocrystallines was closely related to the high surface-energy {221} facets whose surface possessed more dangling bonds and the corresponding SO 2 -sensing mechanism was discussed.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Guangli Ye,Kun Yu,Mengyuan Niu,Qian Wang,Menghan Yu,Xiongbo Dong,Huaming Yang
Minerals have been growing as an emerging ‘hot’ topic in separating water-in-oil emulsions. Whether the intrinsic structure of minerals could precisely regulate water–mineral interactions for enhancing emulsions separation efficiency is still ambiguous. Here, taking half-hydrated gypsum as a case, this study reveals the crystal facet-dependent potential mechanism of minerals in water-in-oil emulsions separation. We show that the (2 0 4) facet of half-hydrated gypsum is more susceptible to water-induced degradation and hydration reaction. With combined experimental and theoretical studies, the facet-dependent mechanism for oil–water separation are revealed; the (2 0 4) facet that exhibited weak internal hydrogen bond and strong binding energy with water accelerated the dissolution and recrystallization of half-hydrated gypsum, thus enhancing oil–water separation efficiency. Through engineering, half-hydrated gypsum with a higher surface fraction of the (2 0 4) facet achieved much higher separation efficiency (99.9%), surpassing those of minerals in disclosed literature. This investigation not only contributes significantly to the comprehension of interactions at the minerals-water interface but also illuminates novel perspectives and avenues for the utilization of facet engineering in advancing research on mineral surface properties.
研究领域:
材料科学
·
环境工程
·
化学工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Science-Nano
·
2024
·
IF 5.8
Chaorong Chen,Haiyang Xian,Jing Liu,Qingze Chen,Xiaoliang Liang,Runliang Zhu,Michael F. Hochella
Photochemical and adsorptive reactions occurring at the mineral–water interface are of great importance in controlling the fate and transport of contaminants in nature, but the effects of the mineral surface structure on the interplay of these two processes and the underlying mechanisms remain largely unknown. In this work, two different structurally well-defined hematite nanocrystals were employed to explore the coupled photoreduction and immobilization of Cr(VI) on various facets of hematite under light irradiation. Compared with hematite quasi-nanocubes (HNCs) exposing only {012} facets, hematite nanoplates (HNPs) with exposed {001} and {113} facets exhibited higher immobilization ability for Cr(VI) under light irradiation, indicating that the coupled process of photoreduction and adsorption of Cr(VI) strongly relied on the particularly exposed facets of hematite. X-ray photoelectron spectroscopy measurements indicated that the removed Cr(VI) from solution was mainly immobilized on hematite surfaces in the form of Cr(III) (the reduced products of Cr(VI)). Transmission electron microscopy and electron energy-loss spectroscopy results revealed that the accumulation of Cr species was predominantly on the {113} facets of HNPs and the {012} facets of HNCs. Theoretical calculations show that the work function difference between the {113} and {001} facets was directly linked with the effective separation of photogenerated electron–hole pairs in HNPs, which is beneficial for the reduction of Cr(VI). The results of desorption experiments indicate that the coupling of photoreduction and adsorption processes significantly promotes the long-term immobilization of Cr species and effectively reduces their environmental risks (the desorption of Cr(VI) from the HNP and HNC samples decreased from 35.9% and 33.5% to 0.3% and 1.7%, respectively). Overall, the exposed facets can significantly affect the electron transfer properties of hematite as well as the binding affinity for Cr species, thereby governing the reduction and immobilization behavior of Cr(VI) on various facets of hematite. These results advance our understanding of the speciation and immobilization of redox-sensitive contaminants at the surfaces of semiconducting minerals in nature.
研究领域:
环境科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhongwei Zou,Haiming Xu,Dongya Li,Jingyu Sun,Dongsheng Xia
The 2D BiOCl nanosheets with excellent photocatalytic activity were synthesized via the facile hydrothermal method by regulating the pH value of the precursor solution and using dulcitol (C 6 H 14 O 6 ) as the surfactant. The photocatalysts were characterized by XRD, FT-IR, SEM, TEM, BET, XPS, ESR, O 2 -TPD, EIS, DRS and PL. The results of morphological and structural characterization indicate that the pH has a large effect on the thickness of the nanosheets and the exposure ratio of {0 0 1} facets. The photocatalytic property of the sample prepared at pH 4 showed excellent visible-light photocatalytic performance to degrade RhB owing to the small thickness, the exposed {0 0 1} facets and the optimum concentration of oxygen vacancy. Moreover, the reasonable photocatalytic mechanism was revealed by the active species trapping experiments and ESR characterization, which suggested O 2 − and h + are the main active species in the present system.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 8
·592
·
IF 5.743
Tong Li,Qi Wang,Zhou Wang
Facet and defect engineering have achieved great success in improving the catalytic performance of CeO2, but the inconsistent reports on the synergistic effect of facet and oxygen vacancy and the lack of investigation on the heavily doped oxygen vacancy keeps it an attractive subject. Inspired by this, CeO2nanocrystals with selectively exposed crystalline facets (octahedron, cube, sphere, rod) and abundant oxygen vacancies have been synthesized to investigate the synergistic effect of facet and heavily doped oxygen vacancy. The contrasting electrochemical behavior displayed by diverse reduced CeO2nanocrystals verifies that oxygen vacancy acts distinctly on different facets. The thermodynamically most stable CeO2octahedron enclosed by heavily doped (111) facets surprisingly exhibited the optimum non-enzymatic H2O2sensing performance, with a high sensitivity (128.83 µA mM−1cm−2), a broad linear range (20 µM~13.61 mM), and a low detection limit (1.63 µM). Meanwhile, the sensor presented satisfying selectivity, repeatability, stability, as well as its feasibility in medical disinfectants. Furthermore, the synergistic effect of facet and oxygen vacancy was clarified by the inclined distribution states of oxygen vacancy and the electronic transmission property. This work enlightens prospective research on the synergistic effect of alternative crystal surface engineering strategies.Keywords:electrochemical H2O2sensing;oxygen vacancy;facet;cerium dioxide
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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