Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 17
·9646-9653
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IF 11.9
Kang Yin,Licheng Lou,Jinlin Wang,Xiao Xu,Jiazheng Zhou,Jiangjian Shi,Dongmei Li,Huijue Wu,Yanhong Luo,Qingbo Meng
In kesterite Cu2ZnSn(S, Se)4 (CZTSSe) solar cells, the insufficient CdS/CZTSSe heterojunction built-in electric field due to the low carrier concentration is an important factor limiting the photoelectric conversion performance. Herein, we introduce an extrinsic La3+ incorporation to realize a synergetic carrier doping of this heterojunction. By forming shallow LaCd and LaSn substitution defects, electron and hole concentration in CdS and kesterite has been obviously increased, which effectively improves the electric property and interface charge transfer of the heterojunction. The resulting reduction in the minority carrier loss has finally realized a high cell efficiency of 13.9% at room temperature. Moreover, the carrier doping allows the heterojunction to work in a much wider temperature region and the cell obtains an impressively high efficiency of 22% at 130 K.
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Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 1
·301-311
·
IF 7.393
Xiang Meng,Xihao Chen,Jiang Cheng,Fuqiang Zhai,Wen Li,Rui Hu,Lu Li
Hollow polycrystalline structures and noble-metal-coating endow ternary sulfides with promising light absorption and electrical properties for solar energy conversion applications. We developed a facile one-pot solvothermal chemical route to synthesize hollow Cu3SbS4 microspheres with an opening. Additionally, four phase-pure Cu–Sb–S high-quality nanocrystals can be produced in a selectable way by the same route. The detailed evolution process and self-driven breakage mechanism have been proposed in detail. Subsequently, in situ reduction of the Ag-ion precursor was conducted and Ag clusters were uniformly deposited in the hollow spherical architecture with a nanoparticle-textured surface and interior to mitigate the oxidization of Cu3SbS4 nanoparticles. The created hollow metal-semiconductor nanocomposite opens up a favorable new situation. The nanocomposites exhibited a remarkably enhanced absorption of over 2 × 105 cm−1, covering the UV and visible regions of the electromagnetic spectrum. The electrical resistivity decreased drastically by 90% after the coating of noble metals. A reduction in the bandgap energy after the addition of Ag to Cu3SbS4 was confirmed from extrapolated optical results and theoretical calculation validation. The synthetic effect of hollow structures and nanocomposites results in the superior performance of Cu–Sb–S compounds, thus highlighting their potential applications in light absorbers and energy conversion technologies.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Hao Zhang,Guang Yang,Yan Sun,Shirong Kang,Mingyu Dou,Hua Yang,Dacheng Li,Jianmin Dou
A heterocycle 2,5-bis(2-pyridyl)-1,3,4-thiadiazole (bptd) as a polydentate reacts with CoCl 2 ∙6H 2 O and NiCl 2 · 6H 2 O to form two novel monomeric complexes, [Co(bptd) 2 Cl 2 ]∙4H 2 O ( 1 ) and [Ni(bptd) 2 Cl 2 ]∙4H 2 O ( 2 ). The complex 1 can act as electron cocatalyst to improve the rate of hydrogen evolution of CdS NRs under visible light irradiation . After the introduction of cobalt lactate complex as a hole cocatalyst, this noble-metal-free system exhibited a hydrogen evolution rate of 1123 μmol h −1 , which is 12.2 times higher than that of pure CdS NRs. This system could work for 50 h with a TON of 7490, and the average AQY is 17% at 420 nm. Based on the results of experiments, the synergistic effect of complex 1 and cobalt lactate complex is proved and a possible mechanism for hydrogen production is proposed. This work may provide a reference for remedying the defects of faster carrier recombination and photocorrosion of CdS in heterogeneous environment.
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JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Qiannan Zhou,Wei Li,Mengyou Gao,Huizhong Xu,Yu Guo,Lei Sun,Dehua Zheng,Jianjian Lin
Metal-organic frameworks (MOFs), as 3D porous precursors, have demonstrated great potential as electrode materials for lithium storage on account of high specific area and tunable structure. To enhance the intrinsic performance and endow MOFs with versatility, constructing distinctive morphology of MOFs while maintaining their porous structure to satisfy various application is highly desirable. Herein, we successfully developed a facile strategy for rationally designing and synthesizing the morphology of MOFs from circular plate shape to truncated octahedron gem shape via regulating the ratio of Pluronic F127 to terephthalic acid . In addition, the as-prepared Pluronic F127-regulated Ti-based MOFs (F-MIL-125-Ti) sacrifice as precursor to derive 3D mesoporous titanium dioxide (TiO 2 ) and as template for in situ growth of molybdenum disulfide (MoS 2 ) nanosheets to prepare a truncated octahedron TiO 2 @C@MoS 2 hierarchical composite. As expected, the distinctive 3D hierarchical TiO 2 @C@MoS 2 electrode exhibits superb rate capability (775 mAh g −1 at 5 C) and outstanding cycling stability (822 mAh g −1 after 1000 cycles at 1 C), which is benefiting from the 3D mesoporous TiO 2 and synergies between TiO 2 and MoS 2 nanosheets. This work develops new insight to design novel and controllable morphology MOFs-derived materials for application of energy storage devices.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Hongpeng Wang,You Zhou,Hongna Xing,Xianfeng Yang,Yan Zong,Juan Feng,Xiuhong Zhu,Zhenhua Shi,Xinghua Li,Xinliang Zheng
Optimizing impedance matching and boosting interfacial polarization by constructing hierarchical magnetic/dielectric heterostructures is a promising strategy to acquire high-performance microwave absorption. Herein, 3D flower-like core-shell Fe 3 O 4 @2H-MoS 2 architectures were constructed, in which magnetic Fe 3 O 4 submicrospheres are uniformly coated by 2H-MoS 2 nanosheets . Compared to bare Fe 3 O 4 and 2H-MoS 2 , the hierarchical Fe 3 O 4 @2H-MoS 2 heterostructures show boosting microwave absorption, which is related to the content of Fe 3 O 4 submicrospheres. When the thickness is only 1.9 mm, the Fe 3 O 4 @2H-MoS 2 heterostructures display an optimal reflection loss (RL) of −50 dB at 13.2 GHz and effective absorption bandwidth (EAB, RL ≤ −10 dB) of 4.2 GHz (11.4–15.6 GHz). Besides, an EAB can be achieved in 14.6–18.0 GHz with an ultrathin thickness of 1.5 mm. The superior microwave absorption of Fe 3 O 4 @2H-MoS 2 heterostructures is mainly originated from two aspects. First, the combination of magnetic Fe 3 O 4 and semi-conducting 2H-MoS 2 can induce better impedance matching in comparison with the bare Fe 3 O 4 and 2H-MoS 2 . Second, the embedded Fe 3 O 4 core can greatly boost the complex permittivity and dielectric loss of 2H-MoS 2 , leading to improved microwave attenuation capacity. The boosting dielectric loss is primarily due to the unique interfacial polarization, induced by the special core-shell hierarchical architectures. This work suggests that optimizing impedance matching and boosting interfacial polarization are effective strategies to improve the microwave absorption of 2H-MoS 2 , which can be realized by loading magnetic nanostructures and designing 3D hierarchical heterostructures.
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POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Wen-Jie Jin,Xian-Wei Cheng,Jin-Ping Guan,Wei Chen,Qin-Fang Qian,Jin-Long Xu
Improving the flame retardancy and anti-dripping ability of polyamide 6 (PA6) fabrics through facile textile finishing technique is of great interest. This study focused on the flame retardant (FR) modification of PA6 fabric using three sulfur/nitrogen-containing compounds with different sulfur valence through exhaustion process. We further explored and compared the thermal stability, heat release ability, FR performance and mechanism of guanidine sulfamate (GAS), thiourea (THU), ammonium sulfate (AMS) on PA6 fabric. The modified PA6 fabrics displayed self-extinguishing ability without dripping action. They also possessed the low damaged length of 8–12 cm and high LOI of about 31.0%, suggesting good flame retardancy. As a comparison, GAS and AMS with positive sulfur valence had higher FR efficiency than THU with negative sulfur valence on PA6 fabric. GAS and AMS modification also decreased the heat release of PA6 fabric by about 20.1% and 16.2%, respectively. According to the thermal stability and char residue analyses, GAS, THU and AMS mainly worked through the gas-phase FR mechanism. A condensed FR action also occurred for THU modified PA6 fabric. Besides, no obvious influence on mechanical performance of PA6 fabric was observed.
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CHEMOSPHERE
·
2021
·
IF 7.086
Hui Cao,Xiuna Ma,Ziqi Wei,Yang Tan,Siwei Chen,Tai Ye,Min Yuan,Jinsong Yu,Xiuxiu Wu,Fengqin Yin,Fei Xu
In this study, a novel eco-friendly porous double-network keratin/polyacrylic acid (keratin-PAA) hydrogel was prepared using the one-pot method to improve the adsorption performance of the hydrogel toward Pb(II). The obtained porous keratin-PAA hydrogel was then characterized using nitrogen adsorption–desorption isotherms, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The interaction mechanism of Pb(II) and the keratin-PAA hydrogel was further investigated using X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The results showed that keratin-PAA hydrogel was successfully synthesized, with a specific surface area of 49.35 m 2 /g and a uniform pore distribution of 6.20 nm. The synthesized keratin-PAA hydrogel only took 6 min to adsorb nearly 70% of Pb(II) from the solution because of the interconnected porous network. The keratin-PAA hydrogel also showed a maximal adsorption amount of 234.6 mg/g, and satisfactory selectivity toward Pb(II). The adsorption kinetics of the keratin-PAA hydrogel binding to Pb(II) could be better described by the pseudo-second-order model, whereas the adsorption isotherms could be fitted using the Langmuir equation; this suggested that chemisorption was the main rate-limiting step. The XPS and FT-IR analysis results indicated that the sulfur-, nitrogen- and oxygen-containing groups in the keratin-PAA hydrogel were the main binding sites for Pb(II). In real aqueous samples, the keratin-PAA hydrogel could remove 93–104% of Pb(II). It is clear that the keratin-PAA hydrogel is an outstanding adsorbent material for the removal of Pb(II) from aqueous samples.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 1
·57-69
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IF 3.591
Shengming Xu,Jing Xu,Linying Hu,Ye Liu,Lijun Ma
In this paper, NiCo2S4 was coated on the surface of WS2 of a 1T/2H mixed phase by a two-step hydrothermal method to form an in situ core–shell structure. The unique S-scheme heterojunction of the NiCo2S4@WS2 core–shell composite photocatalyst improved the easy recombination of carriers caused by the narrow band gap of NiCo2S4 and WS2, and improved the photocatalytic hydrogen production performance. The loading ratio of NiCo2S4@WS2, the addition of Eosin Y, and the pH value of TEOA were optimized. Under the optimal conditions, the hydrogen production rate reached 5.814 mmol g−1 h−1, which is about 8.55 times and 3.35 times the hydrogen evolution rates of NiCo2S4 and WS2, respectively. The composite catalyst exhibits excellent charge separation efficiency in photoelectrochemistry, PL and BET tests, carrier transport rate and large specific surface area that can provide more active sites, which are the main factors for the improvement of the hydrogen evolution performance. This paper demonstrates new design strategies to drive efficient photocatalytic hydrogen production by building in situ core–shell structures and optimizing the carrier transport paths, which will yield new insights.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Mengwei Guo,Zhuoming Wei,Qibo Zhang
The rational design and synthesis of highly efficient, precious metal-free electrocatalysts in the promotion of electrochemical water oxidation is essential for the sustainable use of renewable energy. Herein, an integrated, S-doped MnO x /Mn film developed on carbon paper (CP) formed by a two-step transformation approach that includes template-free electrodeposition and in-situ electrochemical oxidation is employed as an efficient oxygen evolution reaction (OER) electrocatalyst. The doping of S and in-situ electro-oxidation lead to a tailored electronic structure and phase composition , which endow the composite electrode with a significantly enhanced OER catalytic performance. This S-doped integrated electrode perfectly combines highly active MnO x outer layers with conductive metallic Mn inner layers to offer abundant catalytic interfaces and electronic paths, leading to favorable reaction kinetics. As a result, the optimal S-doped MnO x /Mn/CP offers a low overpotential of 435 mV at 10 mA cm −2 with a Tafel slope of 89.97 mV dec −1 as well as improved stability. Impressively, a highly intrinsic catalytic activity with a turnover frequency of 0.0112 s −1 is obtained for S-doped MnO x /Mn/CP, which is 4.2-fold higher than that of MnO x /Mn/CP. S doping plays a critical role in stabilizing the Mn III O x active phase and is ultimately responsible for the enhanced catalytic performance. This work provides an integrated design concept and S doping approach suitable for boosting the OER catalytic performance of MnO x .
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 1
·228-238
·
IF 3.591
Xinyu Liu,Jing Xu,Lijun Ma,Ye Liu,Linying Hu
The construction of heterojunctions can effectively improve the electron transport rate and photocatalytic activity. In this work, nanoflower-like S-scheme heterojunction MoS2/NiAl-LDH was successfully synthesized. The results indicated that the hydrogen yield of the MoS2/NiAl-LDH composite catalyst reached 229.5 μmol in 5 hours under visible light irradiation by adjusting the pH value of the sacrificial agent and the amount of eosin. The crystal structure and morphological characteristics of the composite were analyzed by XRD, SEM and TEM. The visible light response degree and charge separation and transfer rates of photogenerated carriers of the composite were analyzed by UV-Vis DRS, PL and electrochemistry. The electronic transfer path was also analyzed by XPS. The construction of S-scheme heterojunctions can realize effective separation of electron–hole pairs and ensure that the photo-induced carriers with the strongest redox ability can be retained to participate in the photocatalytic reaction. In addition, the feasible mechanism of photocatalytic hydrogen evolution is given. This work will provide different insights into the enhancement of hydrogen evolution by heterojunctions formed by binary semiconductors.
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MATERIALS TECHNOLOGY
·
2021
·
IF 3.846
Yusong Pan,Minyuan Yin,Hongjun Fang,Linfeng Xu,Hanxian Yan,Chengling Pan
Protonated g-C3N4/MoS2 heterojunction with enhanced photocatalytic activity was prepared by treating g-C3N4/MoS2 with formic acid and using a hydrothermal method. The microstructure and morphology of the heterojunctions were analysed by XRD, FTIR, SEM, TEM, and XPS technology, respectively. The photodegradation experiment results verified that the formic acid treatment has a positive effect on the photocatalytic performance of g-C3N4/MoS2 heterojunctions. The as-prepared protonated g-C3N4/MoS2 composite with 5 wt% of MoS2 exhibited the highest photodegradation rate and photodegradation kinetic constant (k) for degradation of methyl orange (MO) dye. The activated species trapping experiment revealed that the superoxide radical (·O2−) plays an important role for degradation of MO dye. Furthermore, the investigation on the photocatalytic mechanism inferred that the enhanced photocatalytic property of protonated g-C3N4/MoS2 composite could be attributed to the Z-scheme electron migration mechanism in composite and the improved photo-induced electron-hole separation.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Biwen Duan,Licheng Lou,Fanqi Meng,Jiazheng Zhou,Jinlin Wang,Jiangjian Shi,Huijue Wu,Yanhong Luo,Dongmei Li,Qingbo Meng
The post-heating treatment of the CZTSSe/CdS heterojunction can enhance the interfacial properties of kesterite Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. In this regard, a two-step annealing method was developed to enhance the heterojunction quality for the first time. That is, a low-temperature (90 °C) process was introduced before the high-temperature treatment, and 12.3% efficiency of CZTSSe solar cells was achieved. Further investigation revealed that the CZTSSe/CdS heterojunction band alignment with a smaller spike barrier can be realized by the two-step annealing treatment, which assisted in carrier transportation and reduced the charge recombination loss, thus enhancing the open-circuit voltage (VOC) and fill factor (FF) of the devices. In addition, the two-step annealing could effectively avoid the disadvantages of direct high-temperature treatment (such as more pinholes on CdS films and excess element diffusion), improve the CdS crystallization, and decrease the defect densities within the device, especially interfacial defects. This work provides an effective method to improve the CZTSSe/CdS heterojunction properties for efficient kesterite solar cells.
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高影响因子
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