Materials Today Energy
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2025
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IF 8.6
Dong Fang,Jiali Wen,Jing Bai,Kai Chen,Kuiming Nie,Chen Bai,Baoxiu Mi,Dapeng Cao,Zhiqiang Gao
This work introduces new inorganic-organic hybrid gel electrolytes for quasi-solid dye-sensitized solar cells (qss-DSSC). Parent gel ( G2 ) contains components of SnI 2 , I 2 , 4-tert-butylpyridine (TBP) and ethylene glycol monomethyl ether (EGME), forms a gel after being sealed in air for about 2 weeks. TBP, EGME and Sn 4+ were proved essential for crystalline gel. Based on G2 , by selectively adding iodide salts, modified gels were obtained, namely G2-DMII , G2-LiI , G2-CsI , G2-CsI-LiI and G2-CsI-DMII , respectively. They were systematically characterized by XRD, SEM, FT-IR, TGA, UV-Vis, CV, EIS and LSV. Compared to G2 , the modified gels show coarser structure with obvious grain boundaries and more surface cavities, and the electrical properties were significantly improved. Among them, G2-CsI-DMII is the most uniform and densest, exhibiting the highest ionic conductivity of 7.22 × 10 −4 S cm −1 and the I 3 − diffusion coefficient of 8.52 × 10 −6 cm 2 s −1 . When integrated into N719-dye based qss-DSSCs, higher PCE of 10.68% under one-sun was achieved. Under indoor light of 10000 lux, the PCE soared to 31.96%, demonstrating the prepared gel electrolyte is efficient and has good adaptability in qss-DSSC applications across diverse lighting conditions. This study offers innovative ideas for designing new gel electrolyte in high-performance solar energy conversion applications.
研究领域:
材料科学
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能量转换
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电化学
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可再生能源
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固态化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2023
·
IF 4.5
Tao Liu,Yongpeng Liu,Yuchan Zhang,Lin Zhang
Lithium metal is the most promising next-generation anode due to its extremely high theoretical specific capacity and lowest operation potential. However, the high reactivity of lithium brings about a series of side reactions and fast capacity decay. Moreover, the inevitably growth of lithium dendrite will cause short circuit or other safety issues. Here, an artificial mixed ionic/electronic SEI (solid electrolyte interphase) is designed by treating the lithium anode with SnI 2 solution in a simple drop coating method. The artificial SEI can inhibit the dendrite growth by forming nuclear agent sites and enable uniform current distribution. Solid state electrolyte is further utilized to improve the safety of battery. The symmetrical cells can cycle for > 750 h at 0.2 mA cm −2 . Notably, all-solid-state LiFePO 4 (LFP)/Li battery can deliver excellent capacity remains 120.6 mAh g −1 after 1000 cycles at 1C with a higher Coulombic efficiency at 99.8%. These results may be also useful for the developing of high energy and high safety lithium metal batteries.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qixian Zheng,Tingting Zhang,Suiting Ning,Xiangbin Chen,Tian Yu,Zhangheng Lai,Gangjian Tan,Xinfeng Tang,Ning Qi,Zhiquan Chen
As a typical argyrodite compound, Ag8SnSe6 is a very promising candidate for thermoelectric materials due to its inherently ultralow lattice thermal conductivity. However, the main obstacle to further improving its thermoelectric properties is its low intrinsic carrier concentration. Appropriate doping may increase the carrier concentration, but the electronic thermal conductivity will also increase simultaneously, which partially compensates for the optimized power factor. This is particularly prominent for materials with ultralow lattice thermal conductivity. In this study, SnI2 was introduced into Ag8SnSe6, which provides more carriers and thus successfully improves the electrical properties. The maximum power factor at 748 K is enhanced from 4.63 μW cm–1 K–2 to 5.83 μW cm–1 K–2 after adding 3 at. % of SnI2. Meanwhile, the substitution of I for Se weakens the chemical bonding strength, resulting in a lowered sound velocity. In addition, doping of I at the Se site also enhances the bond asymmetry, which causes a stronger lattice anharmonicity. As a result, an extremely low lattice thermal conductivity of 0.058 W m–1 K–1 is achieved at 748 K. Eventually, a high zT value of 1.36 was obtained through the above synergistic optimization, which is a 39% improvement compared to the pristine sample (0.98). Our study demonstrates that chemical bonding engineering is an effective way to further suppress the lattice thermal conductivity of Ag8SnSe6 and also provides guidance for improving the thermoelectric properties of other argyrodite compounds.
✓ 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）