CRYSTENGCOMM
·
2016
·Vol. 18
·期 25
·4744-4748
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IF 3.849
Wangen Zhao,Daocheng Pan,Shengzhong (Frank) Liu
Achieving micro-sized and closely packed grains is an essential requirement for high-performance chalcogenide thin film solar cells. Here, I2–II–IV–VI4 (Cu2MnSn(S,Se)4) (CMTSSe) thin films were successfully deposited by carrying out a simple, degradable solution-based process. The structure, composition, and morphology were characterized by powder X-ray diffraction (XRD), energy dispersive spectrometry (EDS), and scanning electron microscopy (SEM), and the Hall effect was also measured. These characterizations indicated that CMTSSe thin films may find applications in photovoltaic absorbing materials. In addition, different substrates were found to affect the morphology and compactness of the grains of the thin film.
研究领域:
材料科学
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太阳能技术
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 53
·47486-47490
·
IF 3.289
Chenhao Zhao,Libin Xu,Zhibiao Hu,Sheng'en Qiu,Kaiyu Liu
Porous carbon with a unique 3D structure has been prepared by the immediate carbonization of potassium tartrate. At an optimal carbonization temperature of 700 °C, the carbon mainly composed of micro- and small meso-porous structure has a Brunauer–Emmett–Teller (BET) specific surface area of 816.2 m2 g−1, and the element Se with an amorphous structure is uniformly encapsulated into the porous structure of carbon. The weight ratio of Se in the composite can reach ∼50%. As the Li–Se battery cathode, the composite shows a (2nd) reversible discharge capacity of 550.5 mA h g−1 with an initial coulombic efficiency of 68.2% at 0.24C, and a discharge capacity of 485.3 mA h g−1 can be retained after 80 cycles. Even at a high current density of 1.2C, the cell also delivers a stable discharge capacity of about 452.3 mA h g−1. The good electrochemical performances of the as-prepared composite may be attributed to high specific surface area and small porous size.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2013
·Vol. 38
·期 1
·448-454
·
IF 2.966
Lai-Jun Zhang,Xing-Can Shen,Hong Liang,Fa-Yun Chen,Hai-Jin Huang
ZnSe:Mn and core–shell ZnSe:Mn/ZnS doped quantum dots (d-dots) have been synthesized by using the alkylamine–H2Se complex and thiourea as new phosphine-free Se and S precursors, respectively. Absorption spectroscopy, steady-state (solution and solid-state) and time-resolved photoluminescence spectroscopy, energy-dispersive X-ray spectroscopy, and transmission electron microscopy were used to characterize the resulting d-dots. Results showed that Mn2+ was successfully doped and mainly distributed in the middle layer of the actual ZnSe/ZnSe:Mn/ZnSe d-dots and ZnSe/ZnSeS:Mn/ZnS d-dots which were simply referred to as ZnSe:Mn and core–shell ZnSe:Mn/ZnS d-dots with ZnSe and ZnS outmost shells, respectively. The increase in the intensity of phosphorescence from the dopant Mn2+ was obtained by the corresponding injection of Zn precursor or Zn/S precursors for ZnSe or ZnS shell growth. As compared to the ZnSe shell, the ZnS shell was grown more significantly on the surface of the ZnSe:Mn core, which led to larger d-dots due to a thicker ZnS shell and thus deeper doping of Mn2+ in the larger host. Outstanding improvement has been achieved in both phosphorescence intensity and stability after growth of the ZnS shell relative to the ZnSe shell. The corresponding phosphorescence efficiency of the resulting d-dot cyclohexane solution was enhanced from about 8% for the ZnSe:Mn d-dots to 35% for the ZnSe:Mn/ZnS d-dots.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Hong-Bo Wang,Yang-Shuo Sun,Fei Ma,Liang Zhou,Hui-Feng Li,Long Zhang,Guan-Jun Chen,Yi-Ku Xu,Yong-Nan Chen,Ke-Wei Xu,Da-Yan Ma
Well-arranged heterogeneous interface is favored to enhance the electrocatalytic activities to utilize the synergistic effects of different crystalline phases. In this work, vertical aligned single crystal Ni 3 Se 2 nanowires (NWs) wrapped by ultra-thin NiSe nanoflakes (NFs) with well-arranged heterogeneous interfaces along axial direction were successfully in situ grown on nickel foam (Ni foam) by a simple one-step hydrothermal method without posttreatment. The growth of Ni 3 Se 2 NWs follows a surface reaction mechanism by which NiSe reacts with reactive Ni · atoms on surface lattice steps of Ni 3 Se 2 nucleuses to grow both along radial and axial directions. The configurations of the products can be tuned from NiSe NFs to the core-shell NWs dominated structures by solely modulating Se molarity in chemical precursors motivated by the accelerated reaction kinetics. The hydrogen evolution reaction (HER) performance was improved with the increase of Se molarity attributing to the increased coverage of high aspect Ni 3 Se 2 /NiSe core-shell NWs arrays, metallic conductive feature of Ni 3 Se 2 skeleton and well-arranged heterogeneous interfaces along the axial direction. The Ni 3 Se 2 /NiSe core-shell NWs with well-arranged heterogeneous interfaces may also be beneficial to other energy or environmental applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Pei Zhu,Yan Wang,Minghang Zhang,Yingdong Wu,Wangfeng Cai
In order to investigate the influence of the anions on the electrochemical performance of cobalt-based compounds, Co 3 O 4 and Co 3 Se 4 are studied and theoretically analyzed with the density functional theory (DFT). Avoiding of the traditional synthesis of the high-temperature annealing for the transition metal oxides, the cubic spinel phase Co 3 O 4 on a nickel foam (NF) substrate with a simple two-step hydrothermal method and Co 3 Se 4 with the core-branched structure by anions exchange method are prepared. The electrochemical measurements show that the capacitance and conductivity of Co 3 Se 4 are significantly better than those of Co 3 O 4 , and Co 3 Se 4 still maintain high capacity at high current density. Furthermore, the kinetics of electrode material Co 3 O 4 and Co 3 Se 4 are analyzed and compared. According to the calculation of the density of states, the results show the band gap of Co 3 O 4 is 2.18 eV and the Fermi energy line of Co 3 Se 4 enters into the conduction band, which means the conductivity of Co 3 Se 4 is better than that of Co 3 O 4 . Additionally, three redox reactions during the charge and discharge process of Co 3 O 4 are determined and the band gaps changes are also calculated.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy Materials
·
2021
·Vol. 12
·期 1
·2102359
·
IF 29.368
Yuan Chang,Panlong Zhai,Jungang Hou,Jijun Zhao,Junfeng Gao
Faced with grave climate change and enormous energy demands, effective catalysts have become more and more important due to their significant effects on reducing fossil fuels consumption. The hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by water splitting are feasible ways to produce clean sustainable energy. Here, atomic structures and related scanning tunneling microscope images of Se defects in PtSe 2 are systematically explored. The equilibrium fractions of vacancies under variable conditions are predicted in detail. In addition, it is found that the vacancies are highly kinetically stable, without recovering or aggregation. The Se vacancies in PtSe 2 can dramatically enhance the HER performance, comparing to Pt(111). It is also revealed that a PtSe 2 monolayer with Se vacancies is also a good OER catalyst. The excellent bipolar catalysis of Se vacancies is further confirmed by experimental measurements. A defective PtSe 2 made via direct selenization of Pt foil at 773 K using a chemical vapor deposition process is produced. It is shown that the HER and OER performance of defective PtSe 2 is much more efficient than Pt foils by a series of measurements. This work, with its compelling theoretical and experimental studies indicates PtSe 2 with Se defects is an ideal bipolar candidate for HER and OER.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Ying Gao,Hanwei He,Wenyu Tan,Yizhi Peng,Xiaomei Dai,Yihui Wu
Exploring efficient, abundant, low-cost and stable materials for hydrogen evolution reaction (HER) is highly desired but still a challenging task. Herein, Ni–Se–Mo electrocatalysts supported on nickel foam (NF) substrate were synthesized by a facile one-step electrodeposition method. The Ni–Se–Mo film presents high electrocatalytic activity and stability toward HER, with a low overpotential of 101 mV to afford a current density of 10 mA cm −2 in 1.0 M KOH medium. Such excellent HER performance of Ni–Se–Mo film induced by the synergistic effects from Mo-doped Ni–Se film leads to the fast electron transfer . This work provides the validity of interface engineering strategy in preparing highly efficient transition metal chalcogenides based HER electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hua Zhang,Wenjuan Fang,Wenran Wang,Nisheng Qian,Xiaohe Ji
The balance between band structure, composition, and defect is essential for improving the optoelectronic properties of ternary and quaternary quantum dots and the corresponding photovoltaic performance. In this work, ascorbic acid (AA) as capping ligand is introduced into the reaction system to prepare green Zn–Cu–In–Se (ZCISe) quantum dots. Results show that the addition of AA can increase the Zn content while decrease the In content, resulting in enlarged band gap, high conduction band energy level, and suppressed charge recombination. When AA/Cu ratio is 1, the quantum dots possess the largest band gap of 1.49 eV and the assembled quantum dot-sensitized solar cells exhibit superior photovoltaic performance with ∼17% increment mainly contributed by the dramatically increased current density. The new record efficiencies of 10.44 and 13.85% are obtained from the ZCISe cells assembled with brass and titanium mesh-based counter electrodes, respectively.
研究领域:
材料科学
·
能源技术
·
光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Xinan Shi,Lijian Huang,Daocheng Pan
In this research, a facile and environmentally friendly solution approach is developed to deposit Cu 2 ZnSn(S,Se) 4 thin films by addition of n -butylammonium butyrate ionic liquid . n -Butylammonium butyrate plays a critical role in solution deposition of Cu 2 ZnSnS 4 precursor thin film. We find that liquid n -butylammonium butyrate can dissolve a number of metal oxides , including Cu 2 O, ZnO, and SnO as well as various metal chlorides , metal nitrates and metal acetates. Smell-free Cu 2 ZnSnS 4 precursor solution is synthesized by dissolving Cu 2 O, ZnO, SnCl 2 and thiourea in an ethanol solution of n -butylammonium butyrate. Thermally degradable n -butylammonium butyrate can be completely removed by a low-temperature sintering process , forming high quality Cu 2 ZnSnS 4 nanoparticle thin film. A power conversion efficiency of 8.79% is obtained by this facile and green solution approach.
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
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Ping Han,Shugui Hua,Jiao Ji,Yun Wu,Long Ma,Huining Xu,Xiaoqin Sun,Sha Yu,Shuangli Chen,Jianmin Xiao,Yuan Dang
In this work, a novel trimetallic non-oxides CoFeMo-A (A=P, Se) with hierarchical porous structure are prepared as the OER electrocatalysts , which are derived from layered double hydroxide (LDH) using zeolitic imidazolate framework-67 (ZIF-67) as the precursor. The prepared CoFeMo-A (A=P, Se) show the rough, loose and hierarchical porous feature, which is beneficial to improve the mass transfer efficiency and the exposure of more active sites. Besides, the electronic configuration of the metals is tuned owing to the incorporation of P and Se and in return the kinetics of OER process is accelerated. Additionally, the LDH derived CoFeMo-A (A=P, Se) can be in situ transformed to the more reactive CoFeMo-oxyhydroxide during the OER process. Benefiting from the above-mentioned advantages, CoFeMo-A (A=P, Se) exhibit excellent electrocatalytic activity for OER with a low overpotential of 273 and 299 mV to achieve a current density of 10 mA cm −2 and the low Tafel slope of 31.2 and 39.5 mV dec −1 for CoFeMo-P and CoFeMo-Se, respectively. The slight difference in OER performance is mainly due to the different crystallinity and intrinsic activity. The work provides a promising strategy to improve the catalytic activity of electrocatalysts by preparing multi-metal non-oxides based on the MOF-derived LDH.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Pengtao Sheng,Youyang Xie,Shuyu Han,Yanling Li,Weili Li
Manganese ion-doped quantum dots (QDs) with wide band gaps have been widely investigated to modify their electronic, magnetic, and photophysical properties. The research on Mn-doped Cu-In-Se QDs with narrow band gaps has been minimal due to the profound differences in the reaction reactivity of cations. In this work, photoluminescent and magnetic Cu-In-Se QD nanoprobes were designed and synthesized by introducing Zn 2+ ions, which function as an intermediate acid that can regulate metal ion acidity to enhance the doping efficiency of Mn 2+ ions in a facile phosphine-free hot-injection protocol. The emission peaks of Zn-doped Cu-In-Se QDs and MnZn-doped Cu-In-Se QDs exhibit significant composition-dependent shifts. Moreover, incorporating manganese ions confers a paramagnetic character to MnZn-doped Cu-In-Se QDs and provides a quasi-core shell structure with an Mn-rich alloy shell layer, as demonstrated by the micro-structural surface analysis and electron paramagnetic resonance spectroscopy . Analyzing the decay lifetime and quantum yield reveals that this host-dopant coupling involves a preferential energy transfer from the host material to the dopant (Mn 2+ ions), wherein photogenerated electrons nonradiatively transfer to the 4 T 1 level of Mn dopant and then recombine with the Cu x state above the valance band of host QDs. The ability to serve as nanoprobes for the visualization of tumors through fluorescence and magnetic resonance dual-modality imaging makes these ternary MnZn-doped Cu-In-Se QDs strong candidates for practical applications in biology/biomedicine field.
研究领域:
材料科学
·
生物医学工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Solar RRL
·
2023
·Vol. 7
·期 17
·2300318
·
IF 7.9
Bowen Liu,Xinan Shi,Wei Shao,Jiaxin Gao,Chenxi Zhao,Fuyan Chen,Dongdong Shen,Bingsuo Zou,Daocheng Pan
Cu(In,Ga)(S,Se) 2 (CIGSSe) solar cells are one of the most promising thin film photovoltaics with a record efficiency of 23.6%. However, the biggest drawback to CIGSSe solar cells is their high material cost, partially resulting from relatively rare and expensive indium and gallium. Therefore, improving the utilization of indium and gallium and reducing their wastage can greatly lower the cost of CIGSSe thin film solar cells. Inkjet printing is a facile, cost-effective, and low-waste deposition technology, which is particularly suitable for low-cost and large-area fabrication of CIGSSe solar cells. Herein, a novel and green ionic liquid-assisted ink to fabricate highly efficient CIGSSe solar cells is developed. The material utilization of inkjet printing can be remarkably improved compared to the conventional vacuum-based deposition approach and spin-coating solution approach. The CIGS printable ink is prepared by dissolving copper acetate, indium acetate, gallium nitrate, and thiourea into ethanol with the assistance of n -butylammonium butyrate ionic liquid. Ionic liquid-assisted CIGS ink has a nearly zero wetting angle and a tunable viscosity, which enable to deposit a flat and continuous CIGS thin film by an inkjet printing method. An encouraging power conversion efficiency of 15.22% has been achieved for inkjet-printed CIGSSe solar cells.
研究领域:
材料科学
·
可再生能源
·
纳米技术
✓ 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）