JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Abdou Karim Darboe,Xiaosi Qi,Xiu Gong,Qiong Peng,Yanli Chen,Ren Xie,Wei Zhong,Guanglei Wu
Interfacial polarization and geometrical morphology play a significant role in the attenuation of electromagnetic (EM) wave. Herein, the two-dimensional (2D)/2D heterojunction with flower-like geometrical morphology is proposed and produced, which may simultaneously provide a large contact area for achieving strong interfacial polarization and activates more sites for the possible multiple EM wave reflection and scattering. By adopting a simple two-step hydrothermal method, MoSe 2 /MoS 2 and MoS 2 /MoSe 2 inner and outer-interchangeable heterojunctions consisting of 2D MoSe 2 and MoS 2 nanosheets with flower-like geometrical morphology were successfully synthesized. The results revealed that the hydrothermal temperatures significantly impacted the flower-like geometrical morphology and MoS 2 content. By optimizing the microstructures, the designed MoSe 2 /MoS 2 and MoS 2 /MoSe 2 heterojunctions presented enhanced comprehensive EM wave absorption properties (EMWAPs), possessing strong absorption capability, wide absorption bandwidth and thin matching thicknesses. Generally, this work demonstrates that the optimized EMWAPs of designed heterojunctions mainly originate from the special interfaces and morphology configuration, which also paves a new way for the designing and synthesis of transition metal dichalcogenides-based heterojunction as a novel and desirable candidate for high-performance microwave absorbers.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 17
·2942
·
IF 5.719
Fancong Zeng,Yingrui Sui,Meiling Ma,Na Zhao,Tianyue Wang,Zhanwu Wang,Lili Yang,Fengyou Wang,Huanan Li,Bin Yao
Cu2Ni0·05Zn0·95Sn(S,Se)4(CNZTSSe) films were synthesized on Mo-coated glass substrates by the simple sol–gel means combined with the selenization process, and CNZTSSe-based solar cells were successfully prepared. The effects of selenization temperature on the performance and the photoelectric conversion efficiency (PCE) of the solar cells were systematically studied. The results show that the crystallinity of films increases as the selenization temperature raises based on nickel (Ni) doping. When the selenization temperature reached 540 °C, CNZTSSe films with a large grain size and a smooth surface can be obtained. The Se doping level gradually increased, and Se occupied the S position in the lattice as the selenization temperature was increased so that the optical band gap (Eg) of the CNZTSSe film could be adjusted in the range of 1.14 to 1.06 eV. In addition, the Ni doping can inhibit the deep level defect of SnZnand the defect cluster [2CuZn+ SnZn]. It reduces the carrier recombination path. Finally, at the optimal selenization temperature of 540 °C, the open circuit voltage (Voc) of the prepared device reached 344 mV and the PCE reached 5.16%.Keywords:solar cell;selenidation temperature;CNZTSSe;sol gel
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2022
·Vol. 16
·期 5
·6057-6066
·
IF 10.269
Zhao Man,Cheng Xiaoru,Xiao He,Gao Jianru,Xue Shoufeng,Wang Xiaoxia,Wu Haishun,Jia Jianfeng,Yang Nianjun
Highly active, stable, and cut-price (photo-)electrocatalysts are desired to overwhelm high energy barriers for anodic oxygen evolution reaction processes. Herein, a heterostructure of cobalt-iron oxide/black phosphorus nanosheets is in-situ synthesized via a facile and novel three-electrode electrolysis method. Bulky black phosphorus is exfoliated into its nanosheets at the cathode while the CoFe oxide is derived directly from the metal wire anode during the electrolysis process. This heterostructure exhibits excellent electrocatalytic oxygen evolution reaction (OER) performance, and the overpotential at 10 mA·cm −2 is 51 mV lower than that of the commercial RuO 2 catalyst. Its superior OER performance stems from the favorable adsorption behavior and an enlarged electrochemical active surface area of the catalyst. To reveal the origin of excellent OER performance from the point of adsorption strength of OH*, methanol oxidation reaction (MOR) test is applied under the identified OER operating conditions. Further introduction of light illumination enhances the OER activity of this heterostructure. The overpotential drops down to 280 mV, benefiting from pronounced photochemical response of black phosphorus nanosheets and iron oxide inside the heterostructure. This work develops a new electrochemical method to construct high performance and light-sensitive heterostructures from black phosphorus nanosheets for the OER.
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
S. Yang,Y. Cheng,T. E,Y. Wang,L. Liu,Y. Li,D. Wang,J. Qian
The inert substrate surface of MoS 2 leads to unsatisfactory adsorption performance. Herein, an inert substrate surface activation strategy is proposed, and the resulted MoS 2 /montmorillonite (MMT) prepared via the hydrothermal method is immersed with NaF (F–Mt). The intercalation of Na + contributes to inducing the transformation of MoS 2 from 2H phase to 1 T phase, thereby providing a large number of S vacancies and exposing available Mo 4+ . Meanwhile, the surface of MMT is activated due to the fact that partially [Si 4 O 10 ] 4- are etched by F - , which facilitates forming Si–O–Mo bonds to promote the charge transfer. The improved charge transfer rate can make S 2- in MoS 2 accumulate more negative charges, greatly enhancing the adsorption capacity to Pb 2+ . Moreover, the natural negative potential on the surface of MMT solves the problem of easy stacking for nanosheets , improving the availability of active sites on the edge, which are also benefit from the etching effect on MoS 2 nanosheets with NaF. The maximum adsorption capacity achieves 97.09 mg/g. Additionally, density functional theory (DFT) calculations confirm the resulted S vacancies in MoS 2 are in favor of removing Pb 2+ , which is also contributed by the electrostatic and chemical adsorption with MMT. Therefore, it suggests that F–Mt is an excellent adsorbent for Pb 2+ .
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Wenbin Gao,Yan Tan,Binhai Wu,Yuzhen Chen,Zhan Hu,Yifan Wang,Yujiao Wen,Zhi Zhou,Nan Zhou
Quinclorac (QNC) and Cr(VI), are common contaminants in surface waters, posing serious hazard to human and ecological health. Nano FeS, an effective catalyst that has excellent redox properties, is susceptible to over-oxidation and agglomeration problems, which impede its practical application. Herein, nano-Fe 1−x S was modified by stable iron oxide (Fe 3 O 4 ) and biochar (BC AA /Fe 1−x S/Fe 3 O 4 ), which presented the core (Fe 1−x S) shell (Fe 3 O 4 )-like structure uniformly dispersed on BC AA surface. The composite overcame the disadvantages of nano-Fe 1−x S and achieved high removal efficiency of 100% and 99.98% for QNC and Cr(VI), respectively. Based on XPS analysis, Fe(II) content was reduced from 53.3% to 34.2% and S(II) content from 13.0% to 6.5%. Fe(II) species in the composite were the main active substance for QNC degradation and Cr(VI) reduction, and S(II) species also indirectly provided electrons to promote Fe 2+ /Fe 3+ cycling. Then, we identified the intermediates of QNC and active radicals • OH or SO 4 •− in the system to suggest possible degradation pathways. We further discovered no mutual interference between QNC and Cr(VI) and proposed the possible mechanism for simultaneous removal that QNC degradation by radical attack and Cr(VI) reduction by electrons.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
Na Lei,Yin Qiao,Guanfu Liu,Renhao Xu,Guohua Jiang,Muslum Demir,Pianpian Ma
Cobalt-based perovskite SrCo 0.875 Nb 0.125 O 3 is an advantageous electrode material for supercapacitors . However, the particle form of SrCo 0.875 Nb 0.125 O 3 is not conducive to the electrochemical behavior. Based on this, surface MnO 2 modified SrCo 0.875 Nb 0.125 O 3 on carbon cloth (MnO 2 @SrCo 0.875 Nb 0.125 O 3 @CC) has been prepared as supercapacitor electrode. The dandelion-like morphology of MnO 2 significantly increases the specific surface area and inhibits the grain agglomeration of SrCo 0.875 Nb 0.125 O 3 , thus promoting the ion diffusion during the electrochemical process. As a result, the electrochemical performance of the composite is significantly optimized due to the synergistic effect of SrCo 0.875 Nb 0.125 O 3 and MnO 2 . The MnO 2 @SrCo 0.875 Nb 0.125 O 3 @CC electrode yields an ultra-high specific capacitance of 2066.0 mF cm −2 at 2 mA cm −2 current density. Compared with SrCo 0.875 Nb 0.125 O 3 @CC electrode and MnO 2 @CC electrode, this work provides a much improved performance. Besides, an asymmetric supercapacitor composed of MnO 2 @ SrCo 0.875 Nb 0.125 O 3 @CC as positive electrode and CuS@CC as negative electrode exhibits a voltage window of 1.8 V and a specific capacitance of 114.6 mF cm −2 when the current density is 3 mA cm −2 . A high energy density of 51.57 μ Wh cm −2 is achieved at a power density of 4.86 mW cm −2 for the device.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 20
·16077-16098
·
IF 2.779
Chen Keke,Feng Hange,Li Lingwei,Luo Menghao,Xue Shaolin,Sang Jingxin
The excellent photoresponse of semiconductors enables them as a promising photocatalyst for photocatalytic degradation of organic pollutants and antibiotics, but their practical applications are limited by photogenerated carrier recombination, instability, and fixed energy band positions. Herein, we designed and synthesized a dual Z-scheme flower-like spherical Ag 3 PO 4 /MoS 2 /g-C 3 N 4 (AMN) photocatalyst loaded with different mass of g-C 3 N 4 (3, 5 and 7 mg). Under visible light irradiation, MoS 2 enhanced the light absorption range of AMN composite. The holes concentrated in the valence band of Ag 3 PO 4 provide strong oxidation capacity, and the electrons retained in conduction band of g-C 3 N 4 provide strong reduction ability in the photocatalytic system. It is helpful to improve the separation efficiency of photogenerated carriers and enhance the photocatalytic activity of AMN composite. The AMN photocatalyst loaded with 5 mg g-C 3 N 4 (AMN-5) has the optimal photocatalytic activity. The photocatalytic degradation efficiency of the photocatalyst for methylene blue (MB) within 24 min is 3.98, 1.85, and 1.17 times that of g-C 3 N 4 , Ag 3 PO 4 , and Ag 3 PO 4 /MoS 2 , respectively. After three cycles, the degradation efficiency of AMN-5 for MB decreased from 99.44% to 90%, about 3.79 times of Ag 3 PO 4 (23.77%). In addition, the optimal AMN-5 photocatalyst also has excellent photocatalytic degradation efficiency for Rhodamine B (RhB) and tetracycline (TC). This design and concept provide a promising insight for the photocatalytic degradation of pollutants.
✓ 已验证
产品关联
DOI
高影响因子
Micro & Nano Letters
·
2022
·Vol. 17
·期 11
·259-271
·
IF 0.98
Yunting Wang,Qing-an Qiao,Honglan Cai,Juan Jin,Hongwei Gao,Yanbin Xu
g-C 3 N 4 was employed as a modified substance for modification engineering of wurtzite-ZnS photocatalysts to overcome its limited light response and stability. The g-C 3 N 4 /ZnS (CNZS) photocatalyst was synthesized by solvothermal reaction of g-C 3 N 4 , thiourea and zinc acetate. The results show that wurtzite-ZnS spheres were loaded on the surface of g-C 3 N 4 with well uniformed size. The photocatalytic activity of the catalyst was determined by the degradation of MB and Rh.B under visible light. The degradation rates of Rh.B and MB by CNZS were 96% and 97%, much better than that of pure ZnS. The addition of g-C 3 N 4 promoted the visible light response of wurtzite-ZnS and inhibited the recombination of photogenerated electrons with holes. The density functional theory (DFT) results indicated that the components of both valence band and conductive band were changed for the CNZS system. Compared to pure ZnS, the band gap of CNZS was decreased about 0.5 eV, and the work function calculations were in good agreement with the experimental results. As a result, the heterostructure of CNZS made it beneficial to the electron transfer from g-C 3 N 4 (2p of N) to ZnS (3p of S) and absorption edge has been extended to about 600 nm.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
H.T. Zheng,Y.C. Zhang,X. He,H.H. Liu,A.Y. Chen,X.F. Xie
Self-healing hydrogels exhibit special self-healing or self-recovery function like human skin after injuring, thereafter, draw lots of attention in biomedical applications. However, self-healing hydrogels with strong mechanical and rapid self-healing properties are not fully realized. MoS 2 /polyvinyl alcohol (PVA) hydrogels are developed to achieve rapid self-healing function by utilizing the excellent photothermal conversion effect of MoS 2 under near-infrared (NIR) light. Effects of microstructure and content of MoS 2 on self-healing and mechanical properties of MoS 2 /PVA hydrogels are investigated, including flower-like MoS 2 spheres by bottom-up hydrothermal reaction and MoS 2 sheets by liquid-phase stripping method. The MoS 2 /PVA hydrogels embodied with the two types of MoS 2 were produced by simple freezing/thawing method, and exhibited rapid self-healing function, together with simultaneous enhancement of strength and ductility. The MoS 2 /PVA hydrogel modified by flower-like MoS 2 spheres with a content of 0.5 wt% presents a significant self-healing function with a healing efficiency up to 90.0% within 5 min, and an enhancement of tensile strength of 9.1 MPa (190% to blank PVA) and a ductility of 162.5% (290% to blank PVA). Furthermore, the MoS 2 /PVA gel with flower-like MoS 2 spheres into the PVA networks produces a significant enhancement of fracture strength (58.4 MPa) after fully curing, characterized by an increases of 612% compared with the pure PVA. The photo-induced self-healing and strengthening effects of the MoS 2 /PVA hydrogels are discussed.
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2022
·
IF 8.634
Jing Jiang,Mei Chen,Yang Luo,Ying Xu,Lunhong Ai
Solar water splitting is essential for future sustainable hydrogen production using renewable resources , but it remains challenging due to expensive solar generators and inefficient electrocatalysts . Herein, we propose a solar thermoelectric water electrolysis system using multifunctional iron foam-supported iron sulfide nanosheet arrays (FeS/IF) as the photothermal conversion unit in solar thermoelectric generator (STEG) and electroactive electrode in water electrolysis. The photothermal FeS/IF rapidly converts solar light to localized heat, supplying the desirable temperature difference for thermoelectric power generation . Meanwhile, the FeS/IF acts as a bifunctional electrode to effectively catalyze the hydrogen and oxygen evolution reactions in alkaline media . As a prototype integrated system , four series-connected FeS/IF-STEG are applied to self-power water splitting with the production rate of 10.7 and 5.3 μmol h −1 for hydrogen and oxygen, respectively. The present study offers new opportunities for rational design of integrated energy systems from renewable solar to sustainable hydrogen.
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2022
·
IF 0.847
Zhaoyang An,Hui Xue,Jing Sun,Niankun Guo,Tianshan Song,Jiawen Sun,Yi-Ru Hao,Qin Wang
Integrating the advantages of anion vacancies and heterostructures into the catalytic materials may increase the binding affinities to intermediates, provide more active sites, and significantly promote the activity of overall water splitting. However, the successful assembly of anion vacancies and heterostructures for high-efficiency water splitting performance is still challenging. In this work, we ingeniously present the co-construction of sulfur vacancies and heterogeneous interface into Ni 3 S 2 /MoS 2 catalysts on nickel foam (NF). The introduction of sulfur vacancies and Ni 3 S 2 /MoS 2 heterostructures can significantly improve electron and ion transport, effectively improve structural stability, and enhance overall water splitting activity. The obtained V S -Ni 3 S 2 /MoS 2 catalysts (V S stands for sulfur vacancies) exhibit superior OER and HER activities, and the overpotentials for OER and HER are 180 and 71 mV at 10 mA·cm −2 , respectively. Furthermore, a low water splitting voltage of 1.46 V is required at 10 mA·cm −2 for the V S -Ni 3 S 2 /MoS 2 catalysts, which is considerably lower than most that of water splitting electrocatalysts currently reported. This work offers an effective mean for the preparation of catalysts with both anion vacancies and heterostructures for achieving high-performance alkaline overall water splitting.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yufei Ren,Chuantao Wang,Wen Duan,Lihai Zhou,Xiangxiang Pang,Danjun Wang,Yanzhong Zhen,Chunming Yang,Ziwei Gao
Electrocatalytic urea oxidation reaction (UOR) is a prospective method to substitute the slow oxygen evolution reaction (OER) and solve the problem of urea-rich water pollution due to the low thermodynamic voltage, but its complex six-electron oxidation process greatly impedes the overall efficiency of electrolysis. Here, density functional theory (DFT) calculations imply that the metallic Ni 3 S 2 and semiconductive MoS 2 could form Mott-Schottky catalyst because of the suitable band structure . Therefore, we synthesized MoS 2 /Ni 3 S 2 electrocatalyst by a simple hydrothermal method , and studied its UOR and hydrogen evolution reaction (HER) performance. The formed MoS 2 /Ni 3 S 2 Schottky heterojunction is only required 109 and 166 mV to obtain ±10 mA cm −2 for UOR and HER, respectively, showing great bifunctional catalytic activity. Moreover, the full urea electrolysis driven by MoS 2 /Ni 3 S 2 delivers 10 and 100 mA cm −2 at a relatively low potential of 1.44 and 1.59 V. Comprehensive experiments and DFT calculations demonstrate that the MoS 2 /Ni 3 S 2 Schottky heterojunction causes self-driven charge transfer at the interface and forms built-in electric field, which is not only benefit to reduce H* adsorption energy , but also helps to adjust the absorption and directional distribution of urea molecules, thereby promoting the activity of decomposition of water and urea. This research furnishes a tactic to devise more efficient catalysts for H 2 generation and the treatment of urea-rich water pollution.
✓ 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）