SOLID STATE IONICS
·
2015
·
IF 2.561
Yaohui Qu,Zhian Zhang,Yanqing Lai,Yexiang Liu,Jie Li
A novel bimodal porous carbon (BPC) with high surface area was prepared by a simple hydrothermal route and KOH activation process , and the Se–BPC composite was synthesized for lithium–selenium batteries by the melt-diffusion method. It is found that the elemental selenium was dispersed inside the pores of BPC based on the analyses. Electrochemical tests reveal that the Se–BPC composite has a large reversible capacity and high rate performance as cathode materials . The Se–BPC (45.1 wt.% Se) composite displays an initial discharge capacity of 552 mAh g − 1 and a reversible discharge capacity of 264 mAh g − 1 after 80 cycles at 1 C charge/discharge rate. In particular, the Se–BPC composite presents a durable cycling performance at high rate of 2 C. These outstanding electrochemical features of Se–BPC composite cathode should be attributed to the uniform BPC with high surface area and bimodal porous structure . The bimodal porous carbon would be a promising carbon matrix to develop high performance lithium–selenium batteries.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Ying Gao,Yihui Wu,Hanwei He,Wenyu Tan
Development of cost-effective and efficient earth-abundant catalysts for hydrogen evolution reaction (HER) is a great challenge. In this study, by one-step potentiostatic electrodeposition, the Ni–Se–Cu electrocatalyst on nickel foam was fabricated as a binder-free HER electrocatalyst. As compared with Ni–Se electrocatalysts, such fabricated Ni–Se–Cu electrocatalyst exhibited prominent electrocatalytic activity to the HER in alkaline electrolyte. This Ni–Se–Cu electrocatalyst exhibits a small overpotential of 136 mV to achieve a current density of 10 mA·cm −2 and high electrochemical stability. The remarkable HER properties of Ni–Se–Cu electrocatalyst mainly originate from high electronic conductivity induced by Cu-doping. This work shows a cheap and simple avenue to develop high efficient non-noble electrochemical electrocatalysts for HER.
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
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 26
·2201049
·
IF 6.389
Yun Zhao,Qianqian Bai,Liqiang Chai,Xiaofei Dong,Jiangtao Chen,Jianbiao Chen,Yan Li,Xiuxun Han
Aiming at the current bottleneck of Cu 2 ZnSn(S,Se) 4 (CZTSSe) thin film solar cells, an experimental analysis of the performance and loss mechanism of CZTSSe thin film solar cells upon proton radiation exposure is presented. In order to deduce the important cell parameters, the environment of the cells is simulated by subjecting the devices to 200 keV proton irradiation with fluences from 1 × 10 10 to 1 × 10 17 cm -2 . It is found that the damage constants are sensitive to the elemental diffusion at heterojunction and Na redistribution in device. The incidence of the proton can lead to bandgap, tails fluctuations, and Urbach energy changes in the cells those directly impact defects and structural disorder in CZTSSe material thereby the device performance. The time-resolved photoluminescence results show that the carrier lifetime is also very sensitive to the distribution of interface elements, especially Na, Cd, and S. These findings may provide new ideas for solving the V OC deficit of CZTSSe solar cells. From this work, it can be also suggested that the CZTSSe thin film solar cells are robust to proton irradiation and have the potential for future space applications.
研究领域:
材料科学
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光伏技术
·
辐射效应研究
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 17
·期 2
·1269-1275
·
IF 6.852
Qingwen Tian,Lijian Huang,Wangen Zhao,Yanchun Yang,Gang Wang,Daocheng Pan
Aqueous solution deposition of metal chalcogenide semiconductor thin films is considered a green and low-cost approach. However, it is hard to find a general aqueous solution approach to deposit various kinds of high-quality metal sulfide thin films. Here, we describe a green and robust ammonium thioglycolate aqueous solution approach, and fifteen types of metal sulfide precursor solutions (metal = Cu, Zn, Sn, Ge, In, Sb, Mg, Cd, Mn, Bi, Fe, Ni, Li, Na, K) can be prepared using metal oxides or metal hydroxides as raw materials at room temperature under an air atmosphere. Moreover, elemental sulfur and selenium can also be highly dissolved. By this green route, high quality CZTS nanocrystal thin films can be deposited by directly coating the mixed Cu, Zn, and Sn precursor solutions without the need for complex nanocrystal synthesis. The remarkable power conversion efficiency of 6.62% was achieved, which is the highest value for aqueous solution deposited CZTSSe thin film solar cells.
研究领域:
材料科学
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可再生能源
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Yafang Qi,Qingwen Tian,Yuena Meng,Dongxing Kou,Zhengji Zhou,Wenhui Zhou,Sixin Wu
The partial substitution of Cu+ with Ag+ into the host lattice of Cu2ZnSn(S,Se)4 thin films can reduce the open-circuit voltage deficit (Voc,deficit) of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. In this paper, elemental Cu, Ag, Zn, Sn, S, and Se powders were dissolved in solvent mixture of 1,2-ethanedithiol (edtH2) and 1,2-ethylenediamine (en) and used for the formation of (Cu1–xAgx)2ZnSn(S,Se)4 (CAZTSSe) thin films with different Ag/(Ag + Cu) ratios. The key feature of this approach is that the impurity atoms can be absolutely excluded. Further results indicate that the variations of grain size, band gap, and depletion width of the CAZTSSe layer are generally determined by Ag substitution content. Benefiting from the Voc enhancement (∼50 mV), the power conversion efficiency is successfully increased from 7.39% (x = 0) to 10.36% (x = 3%), which is the highest efficiency of Ag substituted devices so far.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Chang Liu,Peipei Hou,Wenxiang Chai,Jiawei Tian,Xuerong Zheng,Yaying Shen,Mingjia Zhi,Chunmei Zhou,Yi Liu
Two isostructural quaternary chalcogenidoantimonates(III) BaCuSbQ 3 (Q = S, Se): BaCuSbS 3 ( 1 ) and BaCuSbSe 3 ( 2 ) have been successfully synthesized through a facile hydrazine-hydrothermal method. Both two compounds crystallize in the orthorhombic space group and feature a three-dimensional (3D) channeled [Cu 2 Sb 2 Q 6 ] 4- framework, which is constructed by the distorted tetrahedral CuQ 4 and pyramid SbQ 3 units via vertex sharing. Both optical properties and theoretical studies show 1 and 2 are semiconductors with narrow band gaps. In addition, their photoelectrochemical properties have been investigated.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 19
·10160-10165
·
IF 7.76
Wangen Zhao,Daocheng Pan,Shengzhong (Frank) Liu
Cu2ZnSn(S,Se)4 (CZTSSe) semiconductors have been a focus of extensive research effort owing to low-toxicity, high abundance and low material cost. Yet, the CZTSSe thin film solar cell has a low open-circuit voltage value that presents challenges. Herein, using GeSe2 as a new Ge source material, we have achieved a wider band gap CZTSSe-based semiconductor absorber layer with its band-gap controlled by adjusting the ratio of SnS2 : GeSe2 used. In addition, the Cu2Zn(Sn,Ge)(S,Se)4 thin films were prepared with optimal Ge doping (30%) and solar cells were fabricated to attain a respectable power conversion efficiency of 4.8% under 1.5 AM with an active area of 0.19 cm2 without an anti-reflection layer.
研究领域:
材料科学
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光伏技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 24
·期 9
·2151-2156
·
IF 5.317
Linna Sha,Peng Gao,Xiaochen Ren,Qianqian Chi,Yujin Chen,Piaoping Yang
Graphical Let it Se : An Se−C-bonded interface has been constructed in a Se–graphene (GE) composite through facile high-energy ball-milling. Due to the presence of Se−C bonds, a new self-repairing Se-GE cathode material has been obtained (see graphic). It shows high reversible capacity, long cycle life, and high coulombic efficiency. Lithium–selenium batteries, employing selenium as a cathode material, exhibit some notable advantages, such as high discharge rates and good cycling performance, due to their high electrical conductivity, high output voltages, and high volumetric capacity density. However, an important problem, termed the “shuttle effect”, can lead to capacity decay in Li-Se cells (and in Li-S cells), which arises from aggregation and the loss of Se or S from the cathode into the electrolyte. In this work, in order to solve this problem, a new self-repairing system has been devised, in which some Se atoms are chemically bonded to the carbon atoms of graphene and act as reclaiming points for dissociated Se atoms through the establishment of -Se-Se-Se- chains. Se-decorated graphene (Se-GE) was first constructed through a facile high-energy ball-milling process. Its formation was confirmed by XRD, SEM, HRTEM, XPS, and Raman analyses. As we anticipated, in examining cell properties, the as-prepared Se-GE composite underwent an initial capacity decay in the first 20 cycles (from 1050 mAh g −1 to 750 mAh g −1 , ca. 29 % loss), but the capacity then reverted to 970 mAh g −1 (ca. 92 % of the initial value). Other measurements were also consistent with the recapture of dissociated Se atoms.
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
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Qiqi Mao,Chunjie Li,Wenjing Tian,Tongqing Zhou,You Xu,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
Electrochemical nitrogen reduction reaction (NRR) is a facile and sustainable alternative strategy to Haber-Bosch process for ammonia synthesis. Design of efficient and stable electrocatalysts is critical to NRR. Herein, a two-step method is proposed to fabricate surface Se-doping mesoporous Rh nanoparticles (Se-mRh NPs). Owing to the mesoporous structure and Se modified surface, the Se-mRh NPs exhibit a superior NH 3 yield (21.36 μg h −1 mg −1 cat. ) and Faradaic efficiency (34.54 %) in a neutral electrolyte (0.1 M Na 2 SO 4 ) relative to mesoporous Rh nanoparticles (mRh NPs). The presented synthetic approach is very valuable for design of metallic catalysts with Se modified surface for various electrocatalytic applications.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Xiao Bai,Hang Yin,Chongchao Zhang,Ziyin Yang
Cobalt (Co) based nanomaterials are widely used to construct glucose enzyme-free electrochemical sensors. However, the correlation between anion species and the electrocatalytic activity of Co based nanomaterials remains unproven. In this paper, Co 3 X 4 with different anions (X = O, S, Se) were synthesized for electrochemical sensing of glucose. Co 3 X 4 was characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDX), powder X-ray diffractometry (XRD), and electrochemical techniques. The results showed that anion substitution had a significant effect on the electrocatalytic properties of Co 3 X 4 , and Co 3 Se 4 showed the strongest electrocatalytic activity for the oxidation of glucose. The sensor based on Co 3 Se 4 exhibited excellent performance for glucose analysis with a linear range from 2 μM to 0.71 mM, a high sensitivity of 1327.6 μA mM −1 cm −2 and a low detection limit of 0.3 μM, which demonstrates Co 3 Se 4 as a new nonenzymatic electrocatalyst for glucose sensing.
研究领域:
材料科学
·
电化学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2021
·Vol. 11
·期 7
·
IF 1.548
Lv Xiaogong,Zhu Chengjun,Yang Yanchun,Liu Ruijian,Fan Wenliang,Wang Yiming
In this work, Cu 2 ZnSnS 4 (CZTS) precursor films were deposited using a water-based solution approach. Subsequently, selenization was performed at different temperatures in the range of 480–610 °C to prepare Cu 2 ZnSn(S,Se) 4 (CZTSSe) absorber-layer films. The effects of the selenization temperature on the crystallinity, structure, morphology, and photoelectric properties of CZTSSe thin films, as well as the performance of solar cells constructed using these films, were systematically studied. The absorber-layer films selenized at different temperatures all formed pure-phase CZTSSe and had basically the same film thickness. It was found that application of an optimal selenization temperature can enhance the crystallinity, crystal grain size, and mobility and reduce the resistivity of CZTSSe films. Selenization at 550 °C resulted in the largest grain size (∼ μ m), the highest crystallinity, the highest mobility (4.29 cm 2 V −1 s −1 ), the lowest resistivity (3.13 × 10 2 Ω cm), the thinner fine-grained layer, a bandgap value of 1.21 eV, and a Cu-poor, Zn-rich elemental composition [Cu/(Zn + Sn) = 0.85 and Zn/Sn = 1.16]. The power-conversion efficiency was improved from 3.04% in a CZTSSe cell device with an absorber layer selenized at 480 °C to 4.69% in a film selenized at 550 °C. This was mainly due to the improvement of the crystallinity, crystal grain growth, and reduction of the fine-grained layer of the CZTSSe film. These results show that optimizing the selenization temperature is essential for enhancing the performance and the ultimate device efficiency of CZTSSe absorber layers prepared using a water-based solution approach.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Yanqing Fu,Dongdong Zhang,Pan Li,Yi Han,Juan You,Qiliang Wei,Weiyou Yang
The development of efficient non-precious metal electrocatalysts is essential for oxygen evolution reaction (OER) for water splitting. Among them, amorphous bimetallic NiFe-based compounds are recognized as one of the excellent candidates for efficient OER. Herein, the Ni-Fe-Se film is rationally designed via facile one-step electrodeposition with tailored active sites and thicknesses. Accordingly, the optimized sample, with an increased Fe-incorporation level and a thickness of ∼50 nm, shows a low overpotential of ∼290 mV at a current density of 40 mA cm −2 and long-term durability in 1 M KOH solution, representing its overall excellent OER performance. Furthermore, operando Raman and ex-situ XPS are used to identify the active sites for OER. This work provides some new insights into exploring earth-abundant free-standing catalysts for OER toward overall water-splitting 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
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