APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
X.P. Qiu,J.S. Yu,H.M. Xu,W.X. Chen,W. Hu,G.L. Chen
A heterogeneous nanocomposite catalyst constructed by the Co 3 O 4 nanorods decorated with the Cu 2 O quantum dots (QDs) were successfully synthesized via a simple hydrothermal method followed by an oxidation-reduction processing. The fabricated Cu 2 O/Co 3 O 4 nanocomposite was characterized by the SEM, TEM, XPS, XRD, UV–vis and PL, and the (2 2 0) and (3 1 1) facets of the Co 3 O 4 were exposed. Compared with the original Co 3 O 4 nanorods with an average diameter of 350 nm, a substantial decrease in the band gap was observed after doping the nanorods with the Cu 2 O QDs (average diameter of 5 nm). Such a dramatic decrease in the band gap indicated a significant enhancement of the photocatalytic activities under visible light. The methylene blue (MB) dye and the phenol were used as model organic pollutants, and the Cu 2 O/Co 3 O 4 nanocomposite catalyst exhibited both high catalytic activity and good recycling stability. The catalytic activities of the Cu 2 O/Co 3 O 4 /potassium monopersulfate triple salt (PMS) system for cleaving the MB and the phenol were dependent on the dosages of the Cu 2 O QDs, and the calculated degradation rates achieved by 7.0 wt% Cu 2 O/Co 3 O 4 nanocomposite catalyst were about 11.3 and 1.8 times than that of the pristine Co 3 O 4 nanorod catalyst for the MB and the phenol, respectively. The reactive species of O 2 − and the holes were determined to be the main active species for the phenol photocatalytic degradation by the 7 wt% Cu 2 O/Co 3 O 4 /PMS system and the 7 wt% Cu 2 O/Co 3 O 4 /H 2 O 2 system, respectively.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 10
·2603-2610
·
IF 6.569
Xin Zhang,Shaodong Sun,Jie Cui,Man Yang,Qiao Zhang,Peng Xiao,Jiandong Li,Qing Yang,Shuhua Liang
Surface heterojunction engineering has been demonstrated to be an efficient strategy for the spatial charge separation of photocatalysts. As a consequence, the improved photocatalytic activity is highly determined by the atom arrangement and coordination state of a crystallographic plane. A high-index facet exposed with a high density of low-coordination atoms generally displays better catalytic performance than the low-index one because of its high surface energy. Inspired by the above viewpoints, it is proposed that the construction of a surface heterojunction enclosed by different high-index facets or a mixed form of high-index and low-index facets is a promising avenue to further promote the photocatalytic activity. However, the synthesis of high-index facet based photocatalysts is highly challenging for surface heterojunctions. Herein, we prepare a polyhedral 30-faceted Cu2O microcrystal type-II surface heterojunction co-exposed with 24 high-index {332} facets and 6 low-index {001} facets using a capping agent-assisted liquid-phase reduction method. Compared to the common truncated octahedral (14-facet) Cu2O microcrystal co-exposed with 8 {111} and 6 {001} facets, the 30-faceted Cu2O possesses a highly improved photodegradation activity in the case of normalized specific surface area. Density functional theory (DFT) calculations and in situ photodeposition of metal and metal oxide nanoparticle results indicate that the 30-faceted Cu2O microcrystal is a well-matched {332}–{001} type-II surface heterojunction, which presents a beneficial pathway for efficient charge separation and more high-activity sites for photo-redox reaction than the truncated octahedral surface heterojunction. This work confirms the spatial charge separation and high-index facet dependence in polyhedral Cu2O surface heterojunctions, which provides theoretical guidance for surface heterojunction engineering to enhance photocatalytic activity.
研究领域:
材料科学
·
光催化
·
表面工程
·
纳米结构
·
晶体化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 68
·55520-55526
·
IF 3.84
Dai-Song Chen,Wen-Bei Yu,Zhao Deng,Jing Liu,Jun Jin,Yu Li,Min Wu,Li-Hua Chen,Bao-Lian Su
Hollow Cu2O microspheres (0.7 to 4 μm in diameter) with two active {111} and {110} facets have been prepared in water/ethylene glycol (H2O/EG) solution via a fast hydrothermal route in only 1 h. Due to the dangling “Cu” atoms in the highly active {111} and {110} facets, the microspheres demonstrate preferential selective adsorption and photodegradation for negatively charged methyl orange (MO), comparing to cationic rhodamine B (RhB) and neutral phenol. The 0.7 μm hollow Cu2O microspheres show the best adsorption capacity and photodegradation performance for MO removal: 49% MO can be adsorbed in 60 min and 99.8% MO can be fully removed under visible light illumination in 80 min, owing to the two active {110} and {111} facets and hollow structure. To exactly evaluate the photocatalytic efficiency, a new methodology is proposed by deducting the adsorption effect. The results show that in spite of 99.2% MO is removed from the solution under visible light illumination in 60 min, 14% MO is still adsorbed on the catalyst, which can be totally removed under further 20 min illumination. Our synthesis strategy presents a new opportunity for the preparation of hollow structures with high active facets. And the proposed accurate evaluation methodology may be extended to other photocatalysts with high adsorption capability for organic pollutants.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Changjiang Liu,Hu Zang,Xin Liu,Haiyan Lu,Nan Yu,Baoyou Geng
Copper-based catalysts demonstrate distinctive multicarbon product activity in the CO2 electroreduction reaction (CO2RR); however, their low selectivity presents significant challenges for practical applications. Herein, we have developed a multilevel porous spherical Cu2O structure, wherein the mesopores are enriched with catalytic active sites and effectively stabilize Cu+, while the macropores facilitate the formation of a “gas–liquid–solid” three-phase interface, thereby creating a microenvironment with an increasing water concentration gradient from the interior to the exterior. Potential-driven phase engineering and protonation synergistically optimize the reaction pathway, facilitating a switch between CO and C2H4. At a low current density of 100 mA cm–2, the faradaic efficiency (FE) for CO reaches an impressive 96.97%. When the current density increases to 1000 mA cm–2, FEC2H4 attains 53.05%. Experiments and theoretical calculations indicate that at lower potentials, the pure Cu2O phase diminishes the adsorption of *CO intermediates, while weak protonation inhibits hydrogen evolution reactions, thereby promoting CO production. Conversely, at more negative potentials, the Cu0/Cu+ interface and strong protonation generate locally elevated concentrations of *CO and *COOH intermediates, which enhance C–C coupling and deep hydrogenation, ultimately improving selectivity toward C2+ products. This study provides novel insights into the rational design of copper-based catalysts for customizable CO2 electroreduction products.
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
ACS Applied Nano Materials
·
2025
·
IF 5.5
Yilin Wang,Yuping Chen,Shuang Yao,Furong Zhao,Linxiu Dai,Xian Yang,Changhua An
Electrochemical CO2 energization represents a promising strategy to mitigate its emission and promote resourceful utilization. The production of alcohols offers a sustainable pathway for converting CO2 into value-added chemicals, which is often hindered by low selectivity and high overpotential. In this work, a class of ultrasmall La2O3 nanoparticle-modified Cu2O-based catalyst has been synthesized in situ on a copper foam substrate through a simple hydrothermal method. The optimized catalyst demonstrated a high ethanol Faradaic efficiency of 51.7% at −1.0 V versus the reversible hydrogen electrode (RHE); simultaneously, syngas (CO/H2) was generated with Faradaic efficiencies of 28.27% for CO and 4.8% for H2. This product distribution characteristic enables efficient separation and utilization of both liquid (ethanol) and gaseous (syngas) products. This study highlights the pivotal role of rare earth elements in enhancing CO2RR efficiency by stabilizing reaction intermediates for facilitating C–C coupling. Furthermore, it presents a scalable and cost-effective approach for CO2 energization, paving the way for sustainable green energy production and carbon resource management.
研究领域:
电化学
·
纳米材料
·
能量转换
·
环境科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 8
·3979-3988
·
IF 2.302
Li Ga Long,Ma Pei,Zhang Yi Fan,Liu Xiao Li,Zhang Huan,Xue Wei Ming,Mi Yu,Luo Yan E.,Fan Hai Ming
Cu 2 O nanowire mesocrystals (NWMCs), which possess well-defined octahedral morphology and high-porosity architecture with anisotropic interpenetrating nanowires, have attracted considerable attention owing to their superior physical and chemical properties. However, the current synthetic approach for Cu 2 O NWMCs using graphene oxide as modifier leads to uncontrollable products and low productivity (~30 %), which largely hinder their further industrial application. Herein, we report a modified synthetic approach for controllable and large-scale preparation of Cu 2 O NWMCs using perylene-3,4,9,10-tetracarboxylic dianhydride molecule as modifier. The effects of growth time and initial pH on the morphology of final products have been systemically investigated. Under the optimal reaction condition with initial pH of 5.3 and reaction time of 15 h, the well-defined octahedral Cu 2 O NWMCs can be obtained with a productivity as high as ~75 %. In addition, this synthetic approach can be easily scaled up from 50 to 500 mL autoclave. The ability of high productivity and reproducibility in synthesis of Cu 2 O NWMCs enable us to further study their peroxidase-like activity by catalyzing the oxidation of o -phenylenediamine in the presence of H 2 O 2 . The Cu 2 O NWMCs have exhibited a superior catalytic activity with the K
cat of 1.14 × 10 −2 , 10 times higher than that of horseradish peroxidase. Moreover, the Cu 2 O NWMCs can also retain 69.5 % of their initial activities after 10-batch redox reactions. Our results provide a facile approach to controllable and large-scale synthesis of Cu 2 O NWMCs using homogeneous molecule modifier and open up opportunities to use Cu 2 O NWMCs as nanozyme for future industrial application.
研究领域:
材料科学
·
催化化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2015
·Vol. 17
·期 37
·24361-24369
·
IF 4.493
Gang Wang,Hong Sun,Lu Ding,Gang Zhou,Zhong-Sheng Wang
A simple and versatile hydrothermal method is developed to synthesize Cu–Cu2O, in which Cu particles grow on the surface of a Cu2O truncated octahedron. Through the reduction of Cu2+ by glucose in an alkaline solution, the Cu2O truncated octahedron is quickly formed via a kinetic control process, and then Cu particles selectively nucleate on the high-energy (110) facets of Cu2O, generating a heterostructure. The amount of Cu in the sample is successfully tuned by varying the reaction temperature. Compared to Cu2O, the hybrid Cu–Cu2O architecture shows superior electrocatalytic performance for glucose oxidation due to the synergistic effect between more electrocatalytic active but less conductive Cu2O and more conductive but less electrocatalytic active Cu. By tuning the content of Cu in the heterostructure, the highest electrocatalytic activity is achieved at the Cu/Cu2O molar ratio of 0.83.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Xiao Liu,Yanjun Zhang,Wuxia Zhang,Gang Cheng,Fan Tian,Wei Li,Jinyan Xiong
Rapid charge recombination, limited light response, and slow surface reactions were observed in the photocatalysts, thereby limiting their future-oriented applications in photocatalytic hydrogen production through water splitting. Constructing a multi-channel charge separation photocatalysis system could solve those questions. In this study, Pd-TiO 2 -Cu 2 O composites were successfully accomplished via a facile chemical reduction method. The Pd-TiO 2 -Cu 2 O composite exhibited improved photocatalytic hydrogen production (13069.7 μmol g −1 h −1 ), which was over 6 times as much as that of pure TiO 2 . Based on the photo/electrochemical measurements, it was proposed that a Type II heterojunction was formed at the TiO 2 -Cu 2 O interface under light irradiation, and concurrently, a Schottky barrier was established between Pd and TiO 2 . Accordingly, the Type II heterojunction-created built-in electric field would facilitate the separation of photogenerated charges. Simultaneously, the introduction of Pd accelerates the accumulation of electrons and further enhances the charge transfer rate. The combination of such a Type II heterojunction and Schottky junction synergistically created a multi-channel charge separation system, optimizing surface reactions and thus improving photocatalytic efficiency. This work provided a rational approach for building efficient multi-component photocatalysis systems featuring Type II heterojunction/Schottky junction for photocatalytic hydrogen evolution.
研究领域:
材料科学
·
能源化学
·
光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2017
·Vol. 32
·期 18
·3605-3615
·
IF 1.673
Yongkun Liu,Qin Huang,Guohua Jiang,Depeng Liu,Weijiang Yu
In this work, the hybrid carbon nanofibers (Cu2O/CNFs) containing cuprous oxide (Cu2O) nanoparticles were prepared by a convenient electrospinning method and following a carbonization treatment. The morphology, composition, and microstructure of the Cu2O/CNFs were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and X-ray diffractometer. The as-prepared Cu2O/CNFs exhibited a stronger absorption in the range of 250–700 nm. The band gap energy of the Cu2O/CNFs was estimated to be 2.0 eV. Due to the synergistic effect between photocatalytic activity of Cu2O and excellent adsorption capacity of CNFs, the obtained Cu2O/CNFs exhibited excellent photocatalytic activity for degradation of rhodamine B (RhB) and phenol. The possible mechanism for degradation of RhB and phenol degradation were also discussed. The resultant hybrid carbon composites offer the significant advantages, such as low dosage, high catalytic activity, easy recycling, and excellent stability. We hope that the resultant hybrid composite Cu2O/CNFs could be applied as catalytic materials for further application in the future.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Xiao Liu,Yanjun Zhang,Wuxia Zhang,Gang Cheng,Fan Tian,Wei Li,Jinyan Xiong
Solar-driven photocatalytic hydrogen production from water splitting holds significant potential in addressing the energy crisis and environmental pollution. However, rapid recombination of photogenerated carriers and insufficient surface catalytic reaction kinetics hinder the photocatalytic process. Constructing the catalytic systems with multi-channel charge-separation can effectively alleviate those issues. In this work, ternary PdO@TiO 2 -Cu 2 O composites have been synthesized through precursor calcination and low-temperature reduction, where PdO and Cu 2 O nanoparticles couple with the TiO 2 nanorods. Comparing to single TiO 2 , binary PdO@TiO 2 and TiO 2 -Cu 2 O, the PdO@TiO 2 -Cu 2 O hybrid exhibits enhanced photocatalytic hydrogen production performance (5831μmol g -1 h −1 ), with a hydrogen production rate more than three times that of single TiO 2 . Based on the band structures of TiO 2 and Cu 2 O, along with the photochemical/electrochemical, in-situ EPR, Photoluminescence (PL) tests, and work function calculations, the formation of an S-scheme heterojunction at the TiO 2 -Cu 2 O interface under light illumination facilitates the recombination of electrons in the conduction band (CB) of TiO 2 with holes in the valence band (VB) of Cu 2 O. In this regard, the established built-in electric field significantly accelerates the transfer of photogenerated charges while preserving their respective strong oxidation and reduction capabilities. Meanwhile, the introduction of PdO enriches the holes and further enhances the rate of charge separation. This S-scheme heterojunction with directional charge transfer and oxidation cocatalyst collectively form multi-channels of charge separation, optimizing charge migration and enabling efficient hydrogen production, thus improving the photocatalytic capability of pristine TiO 2 . This study provides a rational approach to construct efficient S-scheme heterojunction/oxidation cocatalyst multi-component catalytic systems for water splitting into hydrogen.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Han Jiao,Yaru Li,Kaihua Gao,Jingyu Zhao,Chun Wang,Mingcheng Li,Ping Na
Electrochemical promotion technology, an environmentally friendly and facile strategy, is becoming increasingly attractive to researchers. In this work, a novel Cu@Cu 2 O foam block composite material was constructed through a one-step hydrothermal method. The product was then employed as the anode and electrified to catalyse removal of radioactive iodide ions (I − ) in the liquid phase. The removal rate of I − sharply increased to 96.65 % under electrification, which is a 4.5-fold increase over that without electrification. The current strength had an impact on this result, and the removal was still relatively high in a wide range of pH values. The composite material had good reusability and could maintain good performance after simple separation. Therefore, based on X-ray diffraction and X-ray photoelectron spectroscopy analysis, we proposed a mechanism of electrochemical oxidation and adsorption coupling for the iodine removal. As Cu@Cu 2 O adsorbed I − to form CuI, the current flow oxidised I − to I 2 , which finally was adsorbed by the formed CuI. Therefore, the current provides services of accelerating I − movement and oxidation. This coupling model of electrocatalytic oxidation and adsorption provides us with a new research method to remove iodide from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Pei Qiu,Jinyan Xiong,Mengjie Lu,Lijun Liu,Wei Li,Zhipan Wen,Weijie Li,Rong Chen,Gang Cheng
Solar-driven photocatalytic H 2 evolution could tackle the issue of fossil fuels-triggered greenhouse gas emission with sustainable clean energy. However, splitting water into hydrogen with high performance by a single semiconductor is challenging because of the poor charge separation efficiency. Herein, a novel ternary Cu@TiO 2 -Cu 2 O hybrid photocatalyst with multiple charge transfer channels has been designed for efficient solar-to-hydrogen evolution. Indeed, the ternary Cu@TiO 2 -Cu 2 O hybrid by coupling Cu@TiO 2 with Cu 2 O nanoparticles shows highly-efficient photocatalytic hydrogen generation with rate of 12000.6 μmol·g −1 ·h −1 , which is 4.4, 2.1, and 1.9 times higher than the pure TiO 2 (2728.8 μmol·g −1 ·h −1 ), binary Cu@TiO 2 (5595.5 μmol·g −1 ·h −1 ), and TiO 2 -Cu 2 O (6076.8 μmol·g −1 ·h −1 ) composite, respectively. In such a Cu@TiO 2 -Cu 2 O hybrid, the formed internal electric field in the TiO 2 -Cu 2 O p-n junction allows the electrons in Cu 2 O to migrate to TiO 2 , while the electrons in the CB of TiO 2 could flow into Cu via the Schottky junction at the Cu@TiO 2 interface. In this regard, a multiple charge transfer is achieved between the Cu@TiO 2 and Cu 2 O, which facilitates promoted charge separation and results in the construction of electron-accumulated center (Cu) and hole-enriched surface (Cu 2 O). This p-n/Schottky junctions with steered charge transfer assists the hydrogen production upon the Cu@TiO 2 -Cu 2 O ternary photocatalyst.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）