SOLAR ENERGY
·
2019
·
IF 4.674
Binxia Yuan,Xiaobo Liu,Xiaodong Cai,Xinyi Fang,Jianfeng Liu,Maoliang Wu,Qunzhi Zhu
In the paper, the zinc and cerium or both doped cuprous oxide (Cu 2 O) crystals were successfully synthesized under low temperature by a simple hydrothermal process. The surface morphologies, structure properties, and optical properties of Cu 2 O crystals were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV-visible absorption spectroscopy. The morphology of pure Cu 2 O crystals, Zn:Cu 2 O crystals, Ce:Cu 2 O crystals and Zn/Ce:Cu 2 O crystals evolved to irregularly cubic structure, exfoliated octahedron, were regular octahedron, and like-spherical aggregate, respectively. The doping of Cu 2 O crystals not only affected the surface morphologies but also significantly influenced the optoelectronic properties. Compared with undoped cuprous oxide, the doped samples had larger optical band gaps. Finally, the aggregation and diffusion were the most important factors for the morphology evolution of Cu 2 O crystal.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
NANO
·
2022
·
IF 1.438
Zhenyang Yao,Yali Yin,Yu Xia,Haitao Chen
All-inorganic halide perovskite (CsPbX 3 ) is a photoelectric material with great potential. However, the Pb element in CsPbX 3 is toxic, which affects the further use of these materials. The toxicity problem can be solved by adding Zn ions into CsPbBr 3 . In this work, Zn-doped cesium lead bromide perovskites (CsPbBr 3 ) nanocrystals (NCs) were synthesized by thermal injection method, and their optical properties were also studied. When Zn was introduced into CsPbBr 3 , its exciton emission summit shifts slightly. By changing the concentration of Zn 2 + , the size and optical properties of Zn:CsPbBr 3 NCs can be controlled. We also study the decay lifetime of its emission peak, and the results showed that Zn:CsPbBr 3 had a longer PL decay lifetime than undoped CsPbBr 3 . This indicated that the incorporation of CsPbBr 3 into Zn 2 + had a good application prospect in the optical field.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Zhen Qin,Wenjian Fang,Junying Liu,Zhidong Wei,Zhi Jiang,Wenfeng Shangguan
A two-step photocatalytic water splitting system, termed a “Z-scheme system”, was achieved using Zn-doped g-C 3 N 4 for H 2 evolution and BiVO 4 for O 2 evolution with Fe 2+ /Fe 3+ as a shuttle redox mediator. H 2 and O 2 were evaluated simultaneously when the doping amount of zinc was 10%. Moreover, Zn-doped (10%) g-C 3 N 4 synthesized by an impregnation method showed superior active ability to form the Z-scheme with BiVO 4 than by in-situ synthesis. X-ray diffraction, UV-Vis spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy were used to characterize the samples. It was determined that more Zn–N bonds could be formed on the surface of g-C 3 N 4 by impregnation, which could facilitate charge transfer.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Chongshang Guan,Tian Hou,Wuyang Nie,Qian Zhang,Libing Duan,Xiaoru Zhao
In this work, different BiOBr powders (without and with Zn doping) were prepared. Their specific properties and photocatalytic performance were studied. Zn doped BiOBr showed higher carrier transportation ability, beneficial to high performance photocatalysis . Further analysis and theoretical calculations unveiled that Zn doping resulted in more dispersive energy band structure with improved oxygen vacancy (O V ) generation due to lattice distortion. O V acted as trap centers, playing dominant role in carrier transportation enhancement, which also synergized with more dispersive energy band due to Zn doping, improving carrier separation and transfer. Besides, Zn doping would further strengthen trapping effect under O V existence, stimulating synergistic enhancement to spatial charge separation and transfer with O V . With synergy of Zn doping and O V , Zn doped samples produced 1.75 times higher CH 4 generation during gas–solid photocatalytic reduction of CO 2 under visible light , testifying successful conducting of Zn doping improved photocatalytic capacity on BiOBr.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Fei Rao,Gangqiang Zhu,Mirabbos Hojamberdiev,Weibin Zhang,Shiping Li,Jianzhi Gao,Fuchun Zhang,Yuhong Huang,Yu Huang
Highly exposed active facets and surface oxygen vacancies (OVs) are beneficial for the photocatalytic removal of various harmful organic compounds. In this study, uniform Zn2+-doped BiOI microspheres, assembled by ultrathin nanosheets with highly exposed {001} facets, with OVs were successfully synthesized for NO removal under visible light irradiation. The phase structure and chemical states are analyzed by means of X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The transmission electron microscopy observations reveal that replacing Bi3+ with Zn2+ can lead to the increased exposure of the {001} facets. X-ray photoelectron and electron paramagnetic resonance spectroscopy results confirm that low-state Zn2+ increases the number of OVs, indicating that an increased number of OVs and a reduced thickness of the nanosheets can enhance the photocatalytic activity for the removal of NO. The photo-oxidative removal efficiency of NO over 3%Zn-BiOI reaches 53.6% and remains highly stable (52.9%) for up to 210 min under visible light irradiation. The calculation of interface adsorption confirms that OVs and Zn2+ can not only offer a donor energy level to extend the solar response range but also act as adsorption sites for low concentration of NO and O2 to optimize the transmission capacity of surface charge carriers. Moreover, this work systematically explains the function of OVs and Zn2+ in the adsorption process of NO. The in situ Fourier transform infrared spectroscopy supports understanding of the photo-oxidative removal mechanisms of NO over Zn-BiOI: (i) the byproducts were bidentate nitrites (bi-NO2–), chelate nitrites (ch-NO2–), and bridging nitrites (br-NO3–) in the dark condition and (ii) the final products were bridging nitrites and bidentate nitrites (bi-NO3–) under visible light irradiation. OVs are found to play an important role both in the dark adsorption and photo-oxidative removal of NO by the 3%Zn-BiOI sample.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jinshui Duan,Ruijun Jia,Kangning Liu,Mingyang Yu,Quanjiang Lv,Shahid Hussain,Sameh M. Osman,Jun Dai,JunLin Liu,Chunxia Wu
Perovskite quantum dots (QDs) have garnered significant interest for their superior optical properties . Despite their attractive photovoltaic properties and chemical processing ability, the high defects density within QDs can result in the annihilation of luminescence. In this study, cesium trifluoroacetic acid (CsTFA) was used as the cesium source, replacing conventional cesium carbonate (Cs 2 CO 3 ) and introducing TFA ligands to improve the luminescence quality of QDs . As well as doping with Zn 2+ to enhance both the stability and luminescence quality of the quantum dot solution. The doped QDs exhibit the highest photoluminescence (PL) intensity, which is further enhanced by the perovskite QDs with TFA as a ligand. Furthermore, the PL spectra of CsPbBr 3 and TFA-CsPbBr 3 : Zn (10 %) QDs with the temperature changes have also been analyzed. The result reveals the relationship between excitons and phonons . Based on the result, Zn 2+ doped and TFA ligand induced perovskite QDs have the potential to serve as an optimal material.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaofeng Mo,Mengye Wang,Han Song,Jie Li,Zhen Wu,Zhang Lin
Organic lead halide perovskite is a promising piezocatalyst for piezocatalytic H 2 production, meanwhile, large amount of unutilized lead resources in lead smelting residues have caused ecological security and resource waste problems. Here, we report an efficient Pb upcycling approach to recover lead halides from lead smelting residues to create lead halide perovskites (r-FAPbBr 3-x I x ), distinguished by the remarkable piezoelectric properties, for piezocatalytic H 2 evolution. Zinc impurities, concurrently from these residues, found their utilization in the partial substitution of Pb 2+ within the halide octahedra of r-FAPbBr 3-x I x . The intervention of zinc enhancing desorption of hydrogen from r-FAPbBr 3-x I x and culminating in a pronounced H 2 yield as 157.80 μmol·g −1 ·h −1 . Notably, the used r-FAPbBr 3-x I x that lost its functional prowess could be regenerated and exhibited a piezocatalytic capacity similar to its initial state, perpetuating a sustainable cycle of utility. This pioneering route to Pb upcycling furnishes an alternative avenue for the preparation and utilization of lead-based perovskites.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Tungsten
·
2025
·
IF 11.2
Li Ya-Ru,Jin Tao,Pan Kun-Ming,Xu Liu-Jie,Li Hao-Jie,Pan Sai-Fei,Ren Yong-Peng,Wei Shi-Zhong
The exploration of highly active and stable bifunctional catalysts based on structural adjustment and charge redistribution is imperative toward overall water splitting. The graphitized carbon encapsulation and the introduction of zinc atoms could enhance conductivity and optimize the electronic structure of catalysts, thereby improving the activities of the oxygen and hydrogen evolution reactions (OER and HER). Herein, a carbon-encapsulated CoS 2 and Zn 0.76 Co 0.24 S composite with porous structure (CoS 2 /Zn 0.76 Co 0.24 S@C) is constructed for overall water splitting by sulphurating a precursor of metanilic guest-intercalated Co Zn-layered double hydroxide (CoZn-LDH) host. Consequently, CoS 2 /Zn 0.76 Co 0.24 S@C reveals lower overpotentials of 260 and 152 mV at 10 mA·cm −2 for OER and HER, respectively, outperforming those of CoS 2 , CoS 2 @C and CoS 2 /ZnS. For overall water splitting, a CoS 2 /Zn 0.76 Co 0.24 S@C-based electrolysis cell exhibits a low cell voltage of 1.66 V at 10 mA·cm −2 with a retention of 81% after 40 h, indicating satisfactory stability. Density functional theory calculations further demonstrate that the encapsulated carbon layer could tune the d-band center of CoS 2 and Zn 0.76 Co 0.24 S. The cooperation of cobalt sulfide with zinc atoms could reduce the work function and promote electronic redistribution, thus enhancing conductivity and boosting the OER/HER kinetics of the catalyst. This work provides an effective strategy for obtaining high conductivity, acceptable activity, strong stability and cost-effective electrocatalysts for water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Yanyan Zheng,Chengyan Liu,Lei Miao,Chao Li,Rong Huang,Jie Gao,Xiaoyang Wang,Junliang Chen,Yanchun Zhou,Eiji Nishibori
MgAgSb-based materials are ideal candidates for thermoelectric applications due to several advantages, such as rich elements, low cost and excellent mechanical robustness. Recently, the all-scale hierarchical architecture and strong anharmonicity in bonding are realized as effective strategies to reduce the lattice thermal conductivity greatly. Here, a design of the all-scale hierarchical architectures, in which the phonon is scattered by the high density of grain boundaries, dislocation, stacking faults, twin boundaries and nanopores , and enhancement of Grüneisen parameter have been demonstrated in reducing the lattice thermal conductivity of MgAgSb materials in the whole temperature range, resulting in an ultralow lattice thermal conductivity ∼ 0.45 W m −1 K −1 at 473 K. Furthermore, the carrier concentration and mobility are also optimized by Zn-doping and heat-treating. The simultaneous optimization of electrical and thermal transport properties contributes to a tremendous enhancement of average ZT to about 1.3 in the range from 323 K to 548 K (the maximum ZT is about 1.4 at 423 K) in the sample Mg 0.97 Zn 0.03 Ag 0.9 Sb 0.95 with heat-treating for 10 days. The method we designed not only boosts the thermoelectric application of MgAgSb-based materials but also enables a synergetic strategy for designing thermoelectric materials with high thermoelectric performance.
研究领域:
材料科学
·
热电学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 31
·17254-17262
·
IF 2.936
Quan Xu,Wei Cai,Miaoran Zhang,Rigu Su,Yingchun Ye,Yeqing Li,Lipeng Zhang,Yongjian Guo,Zhiqiang Yu,Siyu Li,Xun Lin,Yusheng Chen,Yan Luo,Jason Street,Meng Xu
Heteroatom-doped carbon dots (CDs) with excellent optical characteristics and negligible toxicity have emerged in many applications including bioimaging, biosensing, photocatalysis, and photothermal therapy. The metal-doping of CDs using various heteroatoms results in an enhancement of the photophysics but also imparts them with multifunctionality. However, unlike nonmetal doping, typical metal doping results in low fluorescence quantum yields (QYs), and an unclear photoluminescence mechanism. In this contribution, we detail results concerning zinc doped CDs (Zn-CDs) with QYs of up to 35%. The zinc ion charges serve as a surface passivating agent and prevent the aggregation of graphene π–π stacking, leading to an increase in the QY of the Zn-CDs. Structural and chemical investigations using spectroscopic and first principle simulations further revealed the effects of zinc doping on the CDs. The robust Zn-CDs were used for the ultra-trace detection of Hg2+ with a detection limit of 0.1 μM, and a quench mechanism was proposed. The unique optical properties of the Zn-CDs have promise for use in applications such as in vivo sensing and future phototherapy applications.
研究领域:
材料科学
·
光学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Jianghua Wu,Waseem Raza,Peng Wang,Arshad Hussain,Yangbin Ding,Jian Yu,Yanyan Wu,Jie Zhao
A one-pot and energy-saving method was developed to manufacture defective manganese oxide materials. The insertion of zinc ions improves manganese oxide conductivity results in a significant increase in number of defects in the lattice to provide abundant active sites for energy storage. The synthesized zinc doped manganese oxide achieved a maximum capacity of 392 F g −1 in the three-electrode system, the corresponding supercapacitor reached an outstanding energy density of 55.28 Wh kg −1 at a power density of 555.6 W kg −1 , while maintaining 95.2% of the initial capacity after 10,000 cycles. This research sheds new insights to the preparation of defective materials by a simple one-step method for energy storage applications.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jingyun Wang,Wei Li,Xiaofang Chen,Aisheng Huang
Transition metal phosphides are considered as promising alternatives to noble-metal based electrocatalysts for water splitting due to their bifunctional catalytic activity. The modulation of morphology and electronic structure is an efficient strategy to improve the mass transport and electronic conductivity of metal phosphides, but still faces a great challenge to achieve this conjoint regulation. Herein, a facile Zn-doped strategy was developed to synthesize cobalt phosphide (CoP) catalyst with thickness-controlled porous nanosheet structure. At the current density of 10 mA cm −2 , the optimized Zn 0.1 -CoP catalyst delivers an overpotentials of 290 mV and 98 mV for OER and HER , respectively. The cell voltage for the overall water splitting is 1.57 V to reach the current density of 10 mA cm −2 , outperforming the counterparts of noble metal-based Pt/C and IrO 2 catalysts. The density functional theory (DFT) calculations reveal that Zn doping can effectively improve the conductivity and regulate the electronic structure of CoP, thus resulting in fast charge transfer transport and reduced energy barrier of the rate-determining step. This work provides a favorable strategy for the rational design of bifunctional catalysts with high-performance for overall water splitting.
研究领域:
材料科学
·
电催化
✓ 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）