SEMICONDUCTOR SCIENCE AND TECHNOLOGY
·
2025
·Vol. 40
·期 3
·035006
·
IF 2.1
Xingyu Zhang,Lingling Wang,Yawei Wang,Xiangyang Zhao,Rong Fang,Rui Guo,Yue Zhou,Xintong Zhang,Yichun Liu
Modifying the back contact interface plays a key role in improving the efficiency of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. Aiming at the phase decomposition and carrier recombination issues in the CZTSSe/Mo back contact interface, an ultra-thin Mg(OH)2 intermediate layer was introduced between the Mo substrate and the CZTSSe absorber layer. The Mg(OH)2 intermediate layer effectively suppressed the interface phase decomposition reactions and inhibited the generation of interface secondary phases. Meanwhile, during the high-temperature selenization process, the Mg2+ doped into CZTSSe at the back contact interface, reducing the defects and band offset at the CZTSSe/Mo interface. The performance of the device was improved, with a significant increase in efficiency compared to the control device. This work highlights the modification effect of Mg(OH)2 for improving back contact and also provides an easy-handling method to achieve high-performance CZTSSe solar cells.
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Catalysis Science & Technology
·
2025
·
IF 4.2
Mingkang Zhang,Jingwei Wu,Haolin Yang,Xiaohan Wang,Zebao Rui,Junfei Chen
Selective catalytic reduction of nitrogen oxides with methane (CH4-SCR) is an effective way to simultaneously eliminate NOx and CH4 emissions. Development of efficient CH4-SCR reaction system with high NOx reduction activity and selectivity is highly desirable for its commercial application. Herein, a two-part relay reaction system, including sequentially Co@S-1 and In-Ce/H-Beta catalysts, is designed for boosting CH4-SCR. In this system, the Co@S-1 with high redox ability boosts NO oxidation to NO2 and generates key intermediate CH3NO2 that can partially be in situ oxidized and the excessive can migrate to In-Ce/H-Beta. Meanwhile, the inner synergistic effect between InO+ and CeO2 species on In-Ce/H-Beta not only exhibits fair CH4-SCR performance, also facilitates the formation of NO- 3 species to react with the migrated CH3NO2 from Co@S-1. Benefiting from the combination between outer active sites synergy and inner active sites synergy, the simultaneous efficient conversion of NOx (T50 = 380 ℃) and CH4 (T50 = 425 ℃) with well durability is achieved.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shixian Chen,Gaohui Du,Yan Cheng,Di Han,Jiahao Deng,Yunting Wang,Huayu Li,Libing Yao,Dong Wang,Qingmei Su,Bingshe Xu
Lithium-sulfur (Li-S) batteries are poised to become the next-generation energy storage technology due to their ultra-high energy density of 2600 Wh kg −1 and the abundant reserves of sulfur on Earth. However, the practical use of Li-S batteries faces several challenges related to sulfur cathodes, including low sulfur loading, significant volumetric expansion, slow conversion kinetics, and the shuttle effect caused by polysulfides. To tackle these challenges, we have developed a hierarchical porous carbon co-doped with nitrogen, oxygen, and sulfur heteroatoms (NOSHPC) that is further loaded with monodispersed vanadium nitride quantum dots (VNQDs). This innovative combination serves as an efficient catalytic matrix to enhance charge transfer processes and facilitate the anchoring and conversion of lithium polysulfides. Moreover, we have fabricated dry-processed cathodes with ultrahigh sulfur loading by using fibrotic polytetrafluoroethylene (PTFE) as a binder, replacing the toxic solvent N-methyl-2-pyrrolidone and polyvinylidene fluoride. The dry-processed VNQDs/NOSHPC/S cathodes demonstrate a remarkable specific capacity of 1655mAh g −1 at 0.1C and achieve exceptional cycling stability, with a decay rate of only 0.0107 % per cycle over 1000 cycles at 1C with a sulfur loading of 5.2 mg cm −2 . Additionally, the pouch cells containing these dry-processed electrodes exhibit a practical areal capacity of 14.2mAh cm −2 (462 Wh kg −1 ) with a sulfur loading of up to 18.6 mg cm −2 and a low electrolyte-to-sulfur ratio of 5.3μL mg −1 . This work presents an innovative strategy for creating sulfur hosts and practical dry-processed Li-S electrodes, highlighting promising prospects for industrial application.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Bin Jiang,Congcong Zhang,Na Yang,Qi Zhou,Longfei Zhang,Jingshuai Li,Wei Yang,Xiaodong Yang,Luhong Zhang
Developing highly active photocatalysts that can directly utilize clean, cheap, and sustainable solar energy to achieve an efficient carbon dioxide (CO2) cycloaddition reaction under mild reaction conditions (1 bar of CO2) remains a great challenge. In this paper, 2D/2D ZnIn2S4/Zn-NC S-scheme heterojunction composites were constructed by the in situ growth of layered ZnIn2S4 on the surface of two-dimensional (2D) ZIF-L-derived Znδ+ (0 ≤ δ ≤ 2) and N codoped carbon skeletons (Zn-NC-T) via a low-temperature solvothermal method. The optimized ZnIn2S4/Zn-NC-T photocatalysts exhibited favorable photocatalytic CO2 cycloaddition performance, and the yield of cyclic carbonate reached about 98.8% under 10 mmol epoxides reactant, 1 bar CO2 pressure, and full-spectrum irradiation for 4 h. The favorable photocatalytic performance is attributed to the efficient photothermal conversion and effective separation of photogenerated carriers induced by the carbon matrix and heterojunctions, respectively. In addition, the stability of the heterojunction structure and activity were demonstrated through cyclic experiments. Furthermore, the possible mechanism of S-scheme heterojunction photocatalytic CO2 cycloaddition is proposed through electron paramagnetic resonance (EPR) spectra, cyclic voltammetry (CV) experiments, and quenching experiments. The mechanism analysis proved that light irradiation is conducive to the transfer of photogenerated electrons from the conduction band of ZnIn2S4 to epoxides, promoting the formation of ring-opening intermediates, and photogenerated holes may promote the coordination and polarization of adsorbed epoxides. This work not only prepared an S-scheme heterojunction catalyst with excellent photocatalytic CO2 cycloaddition performance but also provided new insights for the rational design of heterojunction catalysts for photocatalytic CO2 cycloaddition.
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ENERGY & FUELS
·
2024
·
IF 5.2
Lan Li,Tingxue Fang,Fuming Lai,Xinyue Li,Tingting Qu,Lin Wang,Xiaoshi Lang,Kedi Cai
Vanadium pentoxide (V2O5) is regarded as a promising sulfur-wrapped matrix for high-performance lithium–sulfur batteries, owing to its desirable structural and functional characteristics. In this paper, a large number of defective sites arise in the vanadium pentoxide structure via a codecoration strategy of the V, O sites, which is more beneficial to improving the electroconductivity and allows for the uniform loading of sulfur on the surface, thereby reducing the polarization resistance and elevating the kinetic rates during the electrochemical reaction. Electrochemical test results indicate that Mg2+/S-codecorated V2O5/S composite cathodes have 1131.15, 942.39, and 804.71 mAh·g–1 of discharge-specific capacities at 0.1, 0.2, and 0.5 C rates, respectively, with the lowest charge/discharge plateau voltage difference, and the capacity retention rate after 140 cycles can be 57.95%. Besides that, the multidefect V2O5 can effectively promote the adsorption strength of lithium polysulfide and catalytically accelerate the rate of liquid-phase conversion between lithium polysulfide so as to achieve the stable electrochemical properties for sulfur composite cathodes.
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CHINESE JOURNAL OF CHEMISTRY
·
2024
·
IF 5.5
Yuhang Qian,Xinye Liu,Xiangjun Zheng,Zilong Yang,Yanjie Yu,Fei Gao,Xingmei Guo,Yuanjun Liu,Xuecheng Cao,Ruihua Guo,Junhao Zhang
Comprehensive Summary Facile mass transport channel and accessible active sites are crucial for binder-free air electrode catalysts in rechargeable flexible zinc-air battery (ZAB). Herein, a ZnS/NH 3 dual-assisted pyrolysis strategy is proposed to prepare N/S-doped hierarchical porous bamboo carbon cloth (HP-NS-BCC) as binder-free air electrode catalyst for ZAB. BCC fabric with abundant micropores is firstly used as flexible carbon support to facilitate the heteroatom-doping and construct the hierarchical porous structure. ZnS nanospheres and NH 3 activization together facilitate the electronic modulation of carbon matrix by N/S-doping and optimize the macro/meso/micropores structure of carbon fibers. Benefiting from the highly-exposed N/S-induced sites with enhanced intrinsic activity, the optimized mass transport of biocarbon fibers, as well as the ultra-large specific surface area of 2436.1 m 2 ·g –1 , the resultant HP-NS-BCC catalyst exhibits improved kinetics for oxygen reduction/evolution reaction. When applied to rechargeable aqueous ZABs, it achieves a significant peak power density of 249.1 mW·cm −2 . As binder-free air electrode catalyst, the flexible ZAB also displays stable cycling over 500 cycles with a minimal voltage gap of 0.42 V, showcasing promising applications in flexible electronic devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Jiaxue Zhang,Ben Hu,Acheng Zhu,Yiming Qi,Yuyang Wang,Shichang Han,Tianyu Zhu,Jie Xu
Poly(ethylene oxide) (PEO)-based electrolytes are widely used for building solid-state lithium–sulfur (Li–S) batteries but suffer from poor lithium-ion (Li + ) transportation kinetics. Here, a lithium-sulfonated covalent organic framework (TpPa-SO 3 Li) was synthesized and functionalized as a Li + pump in a PEO-based solid-state electrolyte to fabricate robust Li–S batteries. The designed TpPa-SO 3 , Li with its porous skeleton and abundant lithium sulfonate groups not only provided iontransport channels but also enhanced the fast migration of Li + . The PEO composite electrolyte containing 5 %-TpPa-SO 3 Li exhibited a notable ionic conductivity of 6.28 × 10 −4 S cm −1 and an impressive Li + transference number of 0.78 at 60 °C. As a result, Li–Li symmetric batteries with the optimized PEO/TpPa-SO 3 Li composite electrolyte stably cycled for 300 h, with a minimal overpotential of only 100 mV at 0.5 mA cm −2 . Moreover, the customized solid-state Li–S batteries based on PEO/TpPa-SO 3 Li were stable for 600 cycles at 60 o C with a high Coulombic efficiency of approximately 98 %. This study provides a promising strategy for introducing covalent-organic-framework (COF)-based Li + pumps to build robust solid-state Li–S batteries.
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PubMed
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Nanomaterials
·
2024
·Vol. 14
·期 14
·1189
·
IF 4.4
Jian Yu,Zhaokang Zheng,Aiwu Wang,Muhammad Humayun,Yasser A. Attia
Molybdenum trioxide (MoO3) is an attractive semiconductor. Thus, bandgap engineering toward photoelectronic applications is appealing yet not well studied. Here, we report the incorporation of sulfur atoms into MoO3, using sulfur powder as a source of sulfur, via a self-developed hydrothermal synthesis approach. The formation of Mo-S bonds in the MoO3material with the synergistic effect of sulfur doping and oxygen vacancies (designated as S-MoO3−x) is confirmed using Fourier-transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR). The bandgap is tuned from 2.68 eV to 2.57 eV upon sulfur doping, as confirmed by UV-VIS DRS spectra. Some MoS2phase is identified with sulfur doping by referring to the photoluminescence (PL) spectra and electrochemical impedance spectroscopy (EIS), allowing significantly improved charge carrier separation and electron transfer efficiency. Therefore, the as-prepared S-MoO3−xdelivers a sensitive photocurrent response and splendid cycling stability. This study on the synergistic effect of sulfur doping and oxygen vacancies provides key insights into the impact of doping strategies on MoO3performance, paving new pathways for its optimization and development in relevant fields.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yachao Xu,Zhong Zhou,Peng Yu,Huiquan Gu,Zixu Zhang,Ying Wang
Efficient reduction of U(VI) to U(IV) during seawater uranium extraction remains a challenge. Here, cerium dioxide quantum dots were bonded to the surface of indium zinc sulfide (ZIS) to form ZIS composite cerium dioxide quantum dots (ZIS/QDs-Ce). The oxygen vacancies are able to activate the Zn-O bonds at the ZIS and QDs-Ce interfaces, thus enabling the constructed S-scheme heterojunction to show great potential in facilitating the separation and transfer of photogenerated carriers. ZIS/QDs-Ce exhibited high anti-bio-pollution activity by generating biotoxic free radical reactive oxygen species (ROS). The photo-induced reduction of uranium by ZIS/QDs-Ce in 10 ppm uranium spiked simulated seawater reached 99.6 %. Oxygen vacancies cause distortions in the crystal field, and the Zn-O bond activation process triggers the movement of ZIS/QDs-Ce from the singlet low-spin state to the stable triplet state, resulting in free-carrier trapping centers and optimized electronic energy band structures. ZIS/QD-Ce has superior uranium extraction capabilities and is highly recommended for uranium extraction from seawater.
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ChemSusChem
·
2025
·
IF 6.6
Umar Farooq,Boyang Han,Usman Ali Shah,Fa Yang,Sheng Li,Yanping Song,Ali Hassan,Zhengquan Li,Jin Wang
The efficiency of earth-abundant kesterite Cu2ZnSn(S,Se)4 (CZTSSe) solar cells has been lagging behind the Shockley-Queisser limit primarily due to the presence of deep-level defects. These deep-level defects cause critical issues such as short carrier diffusion length, significant band tailing, and a large open-circuit voltage (VOC) deficit, ultimately leading to low device efficiency. To address these issues, we propose a post-fabrication defect healing strategy by dip-coating the CZTSSe film in dimethylformamide (DMF) solvent. Immersing the absorber layer in DMF (a polar solvent), neutralizes CuSn antisite defects through chemical bonding and facilitates the formation of a dense, smooth CZTSSe film with larger grain size. Deep-level transient spectroscopy revealed a remarkable increase in carrier diffusion length from 93 nm (control device) to 142 nm (champion device), confirming the beneficial effect of solvent-assisted post-treatment on mitigating CuSn antisite defects. The reduction in defect densities led to a decrease in VOC deficit by up to 289 mV, accompanied by an increased champion device efficiency of 11.4%. This work highlights the huge potential of the DMF post-treatment strategy for defect healing in CZTSSe solar cells.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Zhuo Zeng,Xiaoming Li,Qi Yang,Dongbo Wang,Abing Duan,Shuaijun Pan,Jiangfu Zheng
In advanced oxidation processes (AOPs) based on peroxynitrite (PMS), generating reactive radicals efficiently and consistently is challenging due to high electron occupancy and slow conversion rates of PMS. In this study, ultrathin In 2 O 3 with oxygen vacancies (Ov) was combined with ultrathin ZnAl-LDH to construct S-scheme In 2 O 3 -Ov/ZnAl-LDH-Ov heterojunctions. The presence of Ov promotes the formation of charge-transfer channels (Al-O-In bonding) at the interface of these heterojunctions, thereby reducing electron occupancy and enhancing the generation of active radicals in the InLDH/PMS/Vis system. This S-scheme heterojunction facilitates the acceleration of photogenerated electrons, leading to the rapid conversion of PMS into hydroxyl (•OH) and sulfate radicals (SO 4 - •), and promotes swift electron transfer. Consequently, the InLDH/PMS/Vis system demonstrates exceptional degradation efficiency for a wide range of organic pollutants and a high removal capacity in treating real industrial wastewater. This investigation offers a novel perspective on the coordination mechanisms between photocatalysis and PMS activation.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Pengkun Zhang,Haoyu Wang,Yujie Lai,Yunzhuo Xu,Longyan Chen,Qinhan Wu,Dong-Hau Kuo,Dongfang Lu,Mengistu Tadesse Mosisa,Jiqing Li,Jinguo Lin,Xiaoyun Chen
The rising accumulation of pollutants, including heavy metals and toxic organics, necessitates effective environmental remediation to protect health and biological systems. In this study, a cubic cerianite CeO 2 -like Co/S co-doped CeO 2 sulfur-oxide catalyst (labeled as CeCoOS) with super catalytic reduction performance of pollutants with NaBH 4 as a reducing agent under dark was prepared via a green and facile preparation method. Transition metal Co 2+ -cation and S 2− -anion co-doped CeO 2 adjusted the energy bandgap and introduced oxygen vacancy (Vo), which converted Ce 4+ around Vo into Ce 3+ to maintain electric neutrality. The heterovalent Ce 4+ /Ce 3+ states in Co/S-CeO 2 enhance the electron lifetime and facilitate fast electron transfer . The valence transition between Ce 4+ /Ce 3+ and Vo make the Co/S co-doped in CeO 2 catalyst increase its electrochemically active surface sites and accelerate the pollutants reduction reaction. The CeCoOS-3 with Co/S dopants has an excellent catalytic reduction activity to completely reduce 20 ppm toxic 4-NP in 10 min, 50 ppm organic dyes of MB, RhB, and MO in 6 min, and 50 ppm heavy metal Cr 6+ in 10 min. The CeCoOS-3 sulfur-oxide catalyst also exhibited excellent stability in the reusability test. Therefore, CeCoOS sulfur-oxide catalysts are expected to be used for dye decolorization, detoxification of organic toxins, and reduction of electroplating wastewater.
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