JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Ke Li,Hao Fang,Xiuzhi Duan,Dongshun Deng
Development of high-efficient solvents for NH 3 capture to improve the quality of atmosphere and ecological environment is a hot research topic. Deep eutectic solvents (DESs) as NH 3 absorbents can overcome some problems troubling the traditional NH 3 capture process. In this work, NH 4 SCN was paired with imidazole (Im) DESs to form low viscous DESs with dual active sites for highly efficient NH 3 absorption. The effects of absorption temperature, gas flow rate, water content, molar ratio on NH 3 absorption performance as well as physical properties of NH 4 SCN/Im DESs were systematically investigated. The results show that NH 4 SCN/Im DESs can rapidly capture NH 3 with good recycling performance, while the gas flow rate only shortens the absorption time. The NH 3 absorption capacity of NH 4 SCN/Im DESs decreased with increasing temperature and NH 4 SCN/Im molar ratio. The absorption capacity of NH 4 SCN/Im (1:2) DES reaches 9.65 mol NH 3 /kg DESs for atmospheric NH 3 . Based on 1 H NMR and IR spectroscopy analysis, the strong hydrogen bond between protic ammonium cation and NH 3 plays the major essence of efficient NH 3 capture for NH 4 SCN/Im DESs.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Zhenbo Du,Ruoshui Li,Le Yang,Fengli Liu,Jianming Lin,Jihuai Wu,Zhang Lan
CsPbI 2 Br is a potential material for perovskite solar cells (PSCs) due to its better thermal stability and high efficiency. Centrifugal deposition for film formation greatly simplifies the steps of the conventional anti-solvent spin coating method, but there are still problems hindering progress, such as small grain size and poor photoelectric performance. In this work, NH 4 SCN was introduced as an additive during the preparation of heptylamine (C 7 H 17 N) stabilised CsPbI 2 Br nanoparticles (NCs) and the films were prepared by centrifugal deposition. The results show that the low melting temperature compounds which formed by thiourea from NH 4 SCN decomposition during annealing and unreacted PbX 2 would link the small grains together by melting and flowing; after PbX 2 precipitation and reaction with CsX, the grain size was significantly increased by about 95 % compared to that of the untreated film. Due to large grains, less defects and high crystallinity, the final power conversion efficiency and fill factor reached 12.25 % and 0.70, respectively.
研究领域:
材料科学
·
太阳能
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Joule
·
2018
·
IF 0
Fei Wang,Xianyuan Jiang,Hao Chen,Yuequn Shang,Hefei Liu,Jingle Wei,Wenjia Zhou,Hailong He,Weimin Liu,Zhijun Ning
Summary The power conversion efficiency (PCE) of tin perovskite solar cells is impeded by the extremely poor resistance to oxidation and high density of intrinsic Sn vacancies. Herein, we grow a 2D-quasi-2D-3D Sn perovskite film using removable pseudohalogen NH 4 SCN as a structure regulator. This hierarchy structure remarkably enhances air stability resulting from the parallel growth of 2D PEA 2 SnI 4 as the surface layer. We then explore the hierarchy structure perovskite films in planar structural solar cells, which generate a PCE up to 9.41%. The device retains 90% of its initial performance for almost 600 hr. Our results suggest that adding removable NH 4 SCN in a perovskite precursor can significantly improve the stability and photovoltaic performance of Sn perovskite. This finding provides a powerful strategy to manipulate the structure of low-dimensional perovskite in order to enhance the performance of perovskite solar cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
DOI
ACS Applied Electronic Materials
·
2025
·
IF 4.7
Yibo Zhou,Limin Lai,Yongjie Zhang,Ziyue Wang,Guiyuan Liu,Ying Ma
Metal halide perovskites, particularly those with narrow bandgaps and broadband response, have emerged as promising candidates for photodetectors due to their outstanding optoelectronic properties and cost-effectiveness. Among these, CsPbI2Br films are notable for relatively high stability; however, they often suffer from phase segregation and operational instability, primarily caused by a substantial number of defects at the surface and grain boundaries. In this work, we present a bulk and surface copassivation strategy to mitigate such defects in CsPbI2Br films. This strategy involves the introduction of a pseudohalide salt, NH4SCN, in both the crystallization and post-treatment processes. The SCN– anions can substitute for I– anions or occupy iodide vacancies through strong coordination with Pb2+, thereby facilitating homogeneous crystal growth and reducing the defect density in the CsPbI2Br films by ∼60%. As a result, photodetectors fabricated from NH4SCN-passivated CsPbI2Br films exhibit a low dark current density of 1.30 × 10–10 A cm–2 at −0.1 V and a high specific detectivity of 4.09 × 1012 Jones at 10 Hz, outperforming most previously reported CsPbX3 vertical photodetectors. Moreover, these devices demonstrate excellent operational and ambient stability. This work highlights that bulk and surface copassivation using pseudohalide salts represents a facile and effective approach for developing stable and high-performance perovskite optoelectronic devices.
研究领域:
材料科学
·
光电子学
·
钙钛矿光电探测器
·
半导体器件
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Dongshun Deng,Bao Gao,Chao Zhang,Xiuzhi Duan,Yanhong Cui,Jingheng Ning
Ammonia (NH 3 ) is not only a harmful gas to environmental problem, but also a fundamental raw material in chemical industry. The effective separation and recovery of NH 3 from exhaust gas at low cost still remains a challenge for a long time. In this study, a new strategy to construct protic deep eutectic solvents (DESs) by paring NH 4 SCN as hydrogen-bond acceptor with various hydrogen-bond donors [glycerol (G), ethylene glycol (EG), urea (U), acetamide (AT), and caprolactam (CL)] was proposed for efficient and reversible absorption of NH 3 . Results showed that all the DESs possessed exceptional NH 3 absorption capacity and high NH 3 /CO 2 selectivity. At 303 K and 0.10 MPa, the absorption capacity of NH 3 in NH 4 SCN-glycerol (2:3) is as high as 0.223 g NH 3 per g DES, which is much higher than all reported functional ILs and DESs up to date. The NH 3 saturated DES was easily regenerated and recycled 25 times with persistent absorption performance. The influences of DES composition, temperature, NH 3 partial pressure on NH 3 absorption performance were also explored in detail. The absorption mechanism was analyzed using NMR spectroscopy and quantum calculation. These protic NH 4 SCN-based DESs presented as promising absorbents for NH 3 because of their high absorption capacity and good reversibility.
研究领域:
环境化学
·
分离科学
·
绿色溶剂
·
气体吸收
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Zhongqi Xie,Mengyuan Wei,Xiao Yang,Wanjie Yin,Jiawen Tian,Chuanxiang Sheng,Zhihui Wang,Qing-Song Jiang
Tin–lead mixed perovskites have emerged as promising absorber materials for tandem and low-bandgap photovoltaics, yet their development is hindered by rapid crystallization and severe oxidation of Sn2+. In this work, we propose a synergistic dual-additive strategy using ammonium thiocyanate (NH4SCN) and 4-guanidinobenzoic acid hydrochloride (GBAC) to simultaneously modulate crystallization kinetics and suppress defect formation in FA0.7MA0.3Pb0.5Sn0.5I3 perovskite films. We demonstrate that NH4SCN coordinates with Sn2+ to create a uniform crystalline scaffold by suppressing random nucleation, while GBAC not only passivates iodine vacancies and inhibits Sn2+ oxidation through its multifunctional groups but also efficiently promotes large-grained growth via hydrogen-bonding interactions upon this optimized scaffold. The resulting perovskite films exhibit enhanced crystallinity, reduced trap density, and suppressed nonradiative recombination. Consequently, the inverted tin–lead perovskite solar cells (PSCs) achieve a champion power conversion efficiency (PCE) of 20.41% with negligible hysteresis and significantly improved operational stability, retaining over 91% of their initial efficiency after 1500 h in nitrogen atmosphere. This work provides a deeper understanding of sequential and synergistic additive-driven crystallization and passivation mechanisms, offering a practical route toward efficient and stable low-bandgap perovskite photovoltaics.
研究领域:
光伏技术
·
材料科学
·
钙钛矿太阳能电池
·
可再生能源
·
半导体材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 33
·19669-19685
·
IF 3.119
Shuting Zhang,Guoqiang Li,Liyuan Duan,Hongyu Wang,Yongle Zhao,Yongfa Zhang
Graphitic carbon nitride (g-C3N4) was prepared by a simple thermal polymerization method in this work. The effects of precursor type, thermal polymerization temperature, constant temperature time and atmosphere on the crystal structure, morphology, elemental composition, valence distribution, light absorption properties and photocatalytic activity of the prepared photocatalytic materials were investigated. Taking rhodamine B (RhB) as the target degradant, the blue light catalytic activity of the photocatalytic material was studied in detail. The experimental results showed that the final pyrolysis temperature and constant temperature time are positively related to the adsorption characteristics and photocatalytic ability of the prepared materials. In addition, the adsorption capacity and photocatalytic activity of the products obtained in Ar and H2 atmospheres are better than those produced in CO and CH4, which can be attributed to the combined effect of large specific surface area and structural defects of the materials. The sample's large specific surface area, wide band gap, and excellent photogenerated carrier separation and transfer capabilities make the adsorption performance and photocatalytic performance of the products obtained with ammonium thiocyanate and thiourea as precursors better than those prepared from melamine and dicyandiamide. g-C3N4 prepared by using ammonium thiocyanate as precursor at 550 °C for 5 h under a hydrogen atmosphere showed the best catalytic activity for the degradation of RhB under blue light. It was demonstrated that g-C3N4 prepared exhibited good stability and reusability after four repeat experiments. The active components that play major roles in the degradation of RhB described herein were holes and superoxide radicals, which was inferred by free radical trapping experiments. This work provides a theoretical basis for the idea of converting the mixed salts of desulfurization waste liquid containing ammonium thiocyanate into an excellent photocatalyst g-C3N4 with visible light response.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Meihui Ren,Haijun Zhang,Yun Fan,Dan Wang,Rong Cao,Yuan Gao,Jiping Chen
Thiourea can effectively inhibit the formation of highly toxic chlorinated aromatics in postcombustion zone. However, the inhibition mechanism was still not adequately understood. In this study, naphthalene was adopted as a model aromatic compound to investigate the inhibition effect and mechanism of thiourea on the formation of chlorinated aromatics via electrophilic chlorination over Cu and Fe chlorides. Thiourea addition resulted in the reductions of 77.6–99.8% and 36.4–98.1% in the yield of polychlorinated naphthalenes from naphthalene chlorination mediated by CuCl2 and FeCl3 at 150–300 °C, respectively. The inhibition efficiency of chlorination presented a decreasing tendency with increasing reaction temperature and O2 content in flue gas. X-ray diffraction analysis revealed that the thiourea-induced reduction of highly active Cu (II) and Fe (III) chlorides to less active Cu (I) and Fe (II) chlorides was a primary mechanism for inhibiting aromatic chlorination. [thiourea–Cu]+ complex generated during the reduction process could be transformed into CuS and Cu2S, and isomeric reaction product NH4SCN could react with Cu2+ to produce Cu(SCN)2 and then also form Cu sulfides, suggesting sulfidization of Cu chloride was another important inhibition mechanism. Chlorination inhibition induced by the volatile decomposition products of thiourea might only play a minor role.
研究领域:
环境科学
·
化学工程
·
催化
·
燃烧化学
✓ 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）