ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Xiuwen Wang,Ying Xie,Buhe Bateer,Kai Pan,Yanqing Jiao,Ni Xiong,Song Wang,Honggang Fu
Cu2ZnSnS4 (CZTS) and Cu2ZnSn(S,Se)4 (CZTSSe) as promising photovoltaic materials have drawn much attention because they are environmentally benign and earth-abundant elements. In this work, the monodispersed, low-cost Cu2ZnSnS4 nanocrystals with small size have been controllably synthesized via a wet chemical routine. And CZTSSe could be easily prepared after selenization of CZTS. When they are employed as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs), the power conversion efficiency (PCE) has been improved from 3.54% to 7.13% as CZTS is converted to CZTSSe, which is also compared to that of Pt (7.62%). The exact reason for the enhanced catalytic activity of I3– is discussed with the work function and density functional theory (DFT) when CZTSSe converted from CZTS. The results of a Kelvin probe suggest that the work function of CZTSSe (5.61 eV) is closer to that of Pt (5.65 eV) and higher than that of CZTS, which matched the redox shuttle potential better. According to the theory calculation, all the atomic and bond populations changed significantly when Se replaced partly the S on the CZTS system, especially in the Zn site. During the catalytic process as CEs, the adsorption energy obviously increased compared to those at other sites when I3– adsorbed on the Zn site in CZTSSe. So, Zn plays an important role for the reduction of I3– after CZTS is converted to CZTSSe. Based on above analysis, the reason for enhanced performance of DSSCs when CZTS converted to CZTSSe is mainly due to the enhancement of Zn-site activity. This work is beneficial for understanding the catalytic reaction mechanism of CZTS(Se) as CEs of DSSCs.
研究领域:
光伏材料
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材料科学
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纳米材料
·
能量转换
·
催化
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Xiaoyan Wang,Ying Xie,Zhicheng Cai,Ni Xiong,Zhikun Xu,Mingxia Li,Qingmao Feng,Wei Zhou,Kai Pan
In this work, the sesame ball-like CoS/MoS 2 nanospheres were controllably synthesized via a facile hydrothermal and solvothermal consecutive reaction. MoS 2 nanospheres were preferentially formed by assembly of nanosheets during the hydrothermal reaction . And then CoS nanoparticles were grown on the surface of MoS 2 nanosheets during the solvothermal reaction method. Due to the space confinement effect, CoS grew as nanoparticles with size of 5 nm between MoS 2 nanosheets, and the nanosheets assembled into nanospheres to get the sesame ball-like structure. Because this composite possessed two merits, that is, more active sites of CoS nanoparticles and high conductivity of MoS 2 nanospheres, DSSCs based on this sesame ball-like CoS/MoS 2 nanospheres got a higher power conversion efficiency of 7.48%, which was higher than that based on the solo CoS (7.10%) and solo MoS 2 (4.84%). And it was similarly to the DSSCs based on Pt cathode (7.51%). Their excellent electrocatalytic activities for the I 3 − /I − redox reaction was confirmed by cyclic voltammetry , electrochemical impedance spectra and Tafel polarization measurements. Density functional theory was also used to calculate the adsorption of I 3 − on the surface of CoS/MoS 2 , and the adsorption energy and bond length results indicated Co atoms were the main catalytic active site for I 3 − reduction. The hybrid interactions took place between p orbital of I and 3d states of Co, which lead to I 3 − was activated and dissociated easily.
研究领域:
材料科学
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能源科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-12
·
IF 14.7
Yan Weibin,Liu Ying,Qiu Jiazhen,Tan Feipeng,Liang Jiahui,Cai Xinze,Dai Chunlong,Zhao Jiangqi,Lin Zifeng
The energy industry has taken notice of zinc-iodine (Zn-I 2 ) batteries for their high safety, low cost, and attractive energy density. However, the shuttling of I 3 − by-products at cathode electrode and dendrite issues at Zn metal anode result in short cycle lifespan. Here, a tripartite synergistic optimization strategy is proposed, involving a MXene cathode host, a n - butanol electrolyte additive, and the in-situ solid electrolyte interface (SEI) protection. The MXene possesses catalytic ability to enhance the reaction kinetics and reduce I 3 − by-products. Meanwhile, the partially dissolved n - butanol additive can work synergistically with MXene to inhibit the shuttling of I 3 − . Besides, the n - butanol and I − in the electrolyte can synergistically improve the solvation structure of Zn 2+ . Moreover, an organic-inorganic hybrid SEI is in situ generated on the surface of the Zn anode, which induces stable non-dendritic zinc deposition. As a result, the fabricated batteries exhibit a high capacity of 0.30 mAh cm −2 and a superior energy density of 0.34 mWh cm −2 at a high specific current of 5 A g −1 across 30,000 cycles, with a minimal capacity decay of 0.0004% per cycle. This work offers a promising strategy for the subsequent research to comprehensively improve battery performance.
研究领域:
能源存储
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nano Research
·
2023
·Vol. 17
·期 5
·4437-4443
·
IF 9.9
Zhong Junsen,Huang Bingkun,Yang Kunjie,Ma Zuju,Du Lingyu,Luo Ning,Tang Fengjiao,Hou Chuanxin,Jiang Fuyi,Kang Litao
The electrochromic (EC) mechanisms of inorganic materials are usually based on reversible cation insertion/extraction or metal deposition/dissolution, which are plagued by ion trapping and dendrite growth, respectively. In this paper, a novel conversion-type electrochromic mechanism is proposed, by making good use of the CuI/Cu redox couple. This CuI-based electrochromic system shows a neutral color switching from transparent and dim grey. By simply increasing the bleaching voltage, \({{\rm{I}}_3}^ - /{{\rm{I}}^ - }\) redox couple can be further activated. The generated \({{\rm{I}}_3}^ - \) will readily react with Cu, effectively improving the conversion reversibility and thereby rejuvenating the degraded electrochromic performance. Thanks to the well-designed electrode and the self-healing ability, this conversion electrochromic system achieves rapid response times ( t coloring : 23 s, t bleaching : 6 s), decant optical modulation amplitude (26.4%), high coloration efficiency (86.15 cm 2 ·C −1 ), admirable cyclic durability (without performance degradation after 480 cycles) and excellent optical memory ability (transmittance variation < 1% after 10 h open-circuit storage). The establishment of this conversion-type electrochromism may inspire the exploration of novel electrochromic materials and devices.
研究领域:
材料科学
·
电化学
·
纳米技术
·
智能材料
·
能量存储与转换
✓ 已验证
DOI
高影响因子
Energy Storage Materials
·
2022
·
IF 20.831
Wei Yang,Qiankun Han,Wenshi Li,Maosheng Wu,Jing Yao,Man Zhao,Xianmao Lu
Redox-enhanced electrochemical capacitors (redox ECs) are promising energy-storage devices with the potential to deliver both high power and energy performances, although overcoming the severe self-discharge remains a great challenge due to the shuttle effect of redox species such as I − /I 3 − ions introduced in the electrolytes for gaining additional capacities. Herein, we propose a cation-initiated self-assembly process of Ti 3 C 2 T x MXene nanosheets onto glass fiber membranes to form Janus separators that can mitigate the shuttling of I − /I 3 − ions in iodine-based redox ECs. The interlayer spacing of the MXene films can be controlled by selecting different cations such as imidazolium (C 4 mim + ), Mg 2+ , and Al 3+ , therefore the resulting Janus separators exhibit tailored nanochannels for ion sieving. Both molecular dynamic (MD) simulations and electrochemical tests indicate that C 4 mim + -intercalated MXene Janus separators (C 4 mim + -MXene) can block the diffusion of I 3 − ions while allowing the pass of other electrolyte ions. As a result, self-discharge caused by the shuttle effect can be much reduced in C 4 mim + -MXene-based redox ECs, which deliver voltage and energy retentions substantially higher than that of the cells using glass fiber membrane separators (voltage retention: 70% vs. 10%, energy retention: 51% vs. 6.5%) after 24-h open-circuit test.
研究领域:
材料科学
·
储能技术
·
电化学
·
纳米技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Chong Xu,Jie Zhang,Xing Qian,Weimin Wu,Jiahui Yang,Linxi Hou
Due to the unique features including well-defined void space and high surface-to-volume ratio, non-noble metal catalysts with hollow structures have received intensive researches in dye-sensitized solar cells (DSSCs) and electrochemical water splitting. Herein, we prepare a series of cobalt-incorporated molybdenum sulfide hollow nanoboxes (denoted as Co-MoS x NBs) via a one-step fleet template conversion from cube-shaped Co-based zeolitic imidazolate framework-67 which precipitated without prolonged aged process. During above transformation, it is notable that the surface morphologies of nanobox can be effectively tailored by the proportion of MoS 4 2− . The as-obtained Co-MoS x NBs with well-defined boxed structure and the appropriate doped ratio are developed as bifunctional catalysts for accelerating both reduction of I 3 − in DSSCs and hydrogen evolution reaction (HER). As expected, a high power conversion efficiency (9.64%) is achieved by Co-MoS x -1/3 NBs based DSSC under AM 1.5G irradiation, which is much preceded to that of Pt (8.39%). Meanwhile, the practical utilization of Co-MoS x -1/3 NBs for HER yields a low onset overpotential (35 mV) and a small Tafel slope (61.4 mV decade −1 ) in alkaline medium.
研究领域:
材料科学
·
电化学
·
太阳能
·
纳米技术
·
催化
✓ 已验证
DOI
高影响因子
Nature Photonics
·
2024
·
IF 32.3
Zhou Yang,Guo Zhengfeng,Gu Honggang,Li Yanqiang,Song Yipeng,Liu Shiyuan,Hong Maochun,Zhao Sangen,Luo Junhua
Optical anisotropy, a spatially asymmetric light–matter interaction that manifests itself as birefringence and dichroism, is paramount for manipulating light polarization in modern optics. So far, various natural birefringent crystals are widely used, but their birefringence is limited to <0.3. Here we demonstrate a solution-processable natural crystal C 3 H 8 N 6 I 6 ·3H 2 O with giant birefringence up to 2.8 within the visible to infrared spectral region. Combining critical point analysis and the first-principles calculations, we reveal that this giant optical anisotropy mainly comes from the linear (I 3 ) − structural units in a parallel arrangement, which maximizes the difference of polarizability along the different crystallographic axes. This work highlights the potential of natural polyiodide crystals as an outstanding platform to satisfy the increasing demand for photonic applications that exploit polarization in optical communication, three-dimensional imaging, ultrahigh-resolution sensing and other tasks.
研究领域:
材料科学
·
光学
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Dingyang Chen,Tingting Ma,Xinyue Zhao,Xiaofei Jing,Rui Zhao,Guangshan Zhu
Efficient capture of radioiodine from aqueous solutions is of importance for sustainable development of nuclear energy and protection of the environment. However, current adsorbents under exploration suffer from limited adsorption capacity and powder form that are unfavorable for practical applications. Herein, we applied a “multi-functionalization integration” idea to construct novel electrospun fiber adsorbents (N-MOF-PAN fibers) containing cationic quaternary ammonium groups, uncharged amine groups, and porous MOF material (UiO-66-NH2), which in synergy adsorb iodine effectively from both saturated I2 aqueous solution and I3– aqueous solution. Iodine species (94.6%) could be removed from saturated I2 solution within 180 min, and 98.7% of iodine species were captured from I3– solution within 240 min. Additionally, the N-MOF-PAN fibers exhibited high iodine uptake capacities of 3.56 g g–1 from a concentrated KI/I2 aqueous solution and 3.61 g g–1 from the Langmuir isotherm model, surpassing many reported iodine adsorbents in the aqueous medium. Characterization and mechanism analysis indicated that multiple active sites simultaneously attribute to the high binding affinity toward iodine species through physical adsorption and chemical adsorption. Furthermore, benefiting from their macroscopic architecture, N-MOF-PAN fibers were used as the adsorption column for dynamic iodine capture with a bed volume of 1490 mL, which is much higher than commercially activated carbons. Overall, this work provides guidance for the development of novel fiber adsorbents for related applications.
研究领域:
环境科学
·
材料科学
·
核工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）