JOURNAL OF POWER SOURCES
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2023
·
IF 9.2
Xiaoyu Yang,Ying Qi,Peng Wei,Qixu Hu,Jian Cheng,Yahong Xie
Carbon-based CsPbI 2 Br perovskite solar cells (C–PSCs) have the advantages of low cost and stable performance, but the poor contact and energy mismatch between the perovskite layer and the carbon electrode lead to low power conversion efficiency (PCE). In this work, uniform spindle-shaped Fe 3 O 4 @NC composites have prepared by calcining Fe-based metal organic framework (Fe-MOF) NH 2 -MIL-88B(Fe), which has synthesized by solvothermal reaction using 2-aminoterephthalic acid as nitrogen and carbon sources. Using Fe 3 O 4 @NC composite and UV-Ozone treated Fe 3 O 4 @NC composite (Fe 3 O 4 @NC UVO) as the interfacial layer between the perovskite layer and the carbon electrode, the devices with a structure of FTO/SnO 2 /CsPbI 2 Br/interfacial layer/Carbon exhibit a maximum PCE of 12.25%, which is about 19.28% higher than that of the pristine device. The improved optoelectronic performance is mainly attributed to more matched energy level, denser interface contact, better carrier separation performance and better conductivity. After 19 days of storage at room temperature and ambient humidity, Fe 3 O 4 @NC UVO device has retained 87% of the initial PCE. This work provides a simple and effective strategy to improve the PCE and stability of carbon-based CsPbI 2 Br PSCs with Fe-MOFs-derived carbon materials .
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高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Zhiwei He,Qifeng Lei,Weili Dai,Hongbo Zhang
Alkene epoxidation is a very important reaction process for the selective generation of chiral products, usually performed in some solvent(s) with different polarity, solubility and proton properties. These physical properties are entangled and do not explain very well whether they are mainly against population or stability of the reaction intermediates during catalysis. Here, we investigate how different solvents with known polarity properties (CH 3 CN, (CH 3 ) 2 CO, CH 3 OH, etc.) affect the C 6 H 10 transformation over Ti-Beta catalysts. Combining kinetic measurements, thermodynamic investigations and isotope experiments, the solvent was found not to change the reaction path or mechanism, with C 6 H 10 epoxidation most likely following the Eley-Rideal mechanism and C 6 H 10 O hydration following a Langmuir-Hinshelwood mechanism, and both nucleophile and carbonium were found to be involved in the transition state (c.a. SN 2 process) of hydration. However, in the epoxidation reaction of C 6 H 10 with CH 3 CN and (CH 3 ) 2 CO as solvents, the reaction order of [C 6 H 10 ] is subtly different and the epoxidation rate increases with increasing volumetric fraction of CH 3 CN in the binary mixture, which indicates that the solvent affects the concentration of dissolved C 6 H 10 surrounding the active sites and leads to the corresponding differences in activity and product selectivity. Nevertheless, the measured apparent reaction barrier (energy difference between transition state and MASIs) spans the elementary step of solvent modification, thus allowing for the observation of negligible solvent thermodynamic modification. Collectively, these findings provide clear evidence of solvent effects on alkene epoxidation and can be easily extended to some other reactions in solvents.
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高影响因子
Nanoscale
·
2023
·Vol. 15
·期 17
·7803-7811
·
IF 6.7
Tian Sun,Tong Chen,Jiahao Chen,Qiang Lou,Zihao Liang,Guijun Li,Xiaoyun Lin,Guoshen Yang,Hang Zhou
Despite the impressive developments in perovskite optoelectronic devices, their long-term stability remains a major challenge. Chemical reactions and ion exchange at the metal/perovskite contact interface are two significant factors that lead to the failure of perovskite devices. To address this issue, a titanium nitride (TiN) layer is introduced as a robust corrosion-resistant coating between perovskite films and metal electrodes. By introducing TiN layer, a perovskite photodiode with dark current down to 3.25 × 10−11 A cm−2 is realized. Consequently, the TiN-based perovskite photodiode shows a specific detectivity of 1.21 × 1014 cm W−1 Hz1/2, which is approximately two orders of magnitude higher than that of the control device without a TiN layer. Under continuous illumination of a 520 nm green light for 576 000 cycles, the responsivity of the TiN-based photodetector remains at 94.27% of its initial value. The TiN-based photodetector exhibits superior stability under thermal stress. After aging at 85 °C for 572 h, the TiN-based photodetector retains 72% of its initial responsivity. Using the TiN-based photodiode, a perovskite image sensor containing 64 × 64 pixelated perovskite photodiodes is constructed over an amorphous silicon thin-film transistor (TFT) backplane. The perovskite image sensor exhibits real-time imaging capability and long-term stability for over 6 months. This study highlights the importance of using metallic nitrides to achieve high-performance and air-stable perovskite devices for optoelectronic applications.
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PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 4
·047505
·
IF 3.9
Yao Xiong,Ruimei Wu,Lulu Xu,Ying Zhong,Yu Ge,Yangping Wen,Hang Yao,Weiqi Zhou,Shirong Ai
Extraordinary electronic performance and unique structural characteristic of black phosphorene (BP) often is used as electrode modified materials in electrochemical sensors. In this paper, a machine learning (ML) strategy for phosphorene nanozyme sensor and its the intelligent of clenbuterol (CLB) in pork and pig serum samples is prepared. The silver nanoparticles decorate BP to prevent oxidative degradation of BP surface and further hybridize with multi-walled carbon nanotubes (MWCNTs) composites containing nafion (Nf) treated with isopropanol (IP) to improve environmental stability and electrocatalytic capacity of BP. Back-propagation artificial neural network (BP-ANN) model combined with genetic algorithm (GA) is employed to optimize sensor parameters such as BP concentrations, MWCNTs concentrations and ratio of VNf:VIP, and compared with orthogonal experimental design (OED). Least square support vector machine, radial basis function and extreme learning machine are implemented to establish quantitative analysis model for CLB. The results showed that the CLB response current of BP sensor by BP-ANN-GA was improved 9.02% over OED method. Compared with the traditional linear regression, three models displayed better predictive performance, and LS-SVM was the best with the R2, RMSE and MAE and RPD of 0.9977, 0.0303, 0.0225, and 18.74, respectively. The average recoveries of CLB in pork and pig serum was 98.66% ∼ 101.67%, and its relative standard deviations was 0.19% ∼ 0.84%, indicating that electrochemical sensor using machine learning for intelligent analysis of CLB in animal-derived agro-products products was both feasible and practical.
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RSC Advances
·
2023
·Vol. 13
·期 17
·11635-11641
·
IF 3.9
Jiru Guo,Yanxia Zheng,Yuchao Li,Zijian Wen,Xiuxu Shen,Yansong Zhao
4,4′-Dichlorodiphenyl sulfoxide is the main raw material for the manufacture of polysulfone, polyether sulfone and other engineering plastics. It is also an intermediate for medicines, dyes and pesticides, which has been widely utilized in engineering plastics, fine chemicals and other fields. The alkylation of chlorobenzene with thionyl chloride can give 4,4′-dichlorodiphenyl sulfoxide as a product using Lewis acidic ionic liquids. In this work, metal-based methylimidazolium ionic liquids were synthesized, which were found to be efficient catalysts for alkylation reactions. The molar ratio of different metal chlorides to 1-butyl-3-methyl imidazole chloride and the influence of different metal chlorine additives on the catalytic Lewis acid center were investigated. The fissionable species of AlCl3 in ionic liquids will enhance the acidity of ionic liquids and, thus, promote the catalytic performance of ionic liquids. Under the optimized reaction conditions, the conversion rate of excess chlorobenzene was 45.3% and the selectivity of 4,4′-dichlorodiphenyl sulfoxide was 31.9%.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jing Zhang,Beier Hu,Zhongli Guo,Hongqiang Luo,Rui Wang,Mingpo Li,Mengyu Chen,Cheng Li
The poor stability of metal halide perovskite seriously affects the large-scale commercial application of perovskite solar cells (PSCs). Here, a large-particle Zr-based metal–organic framework (Zr-MOF), e.g. UiO-66 (NH 2 ), is added to the precursor solution of SnO 2 electron transport layer (ETL), realizing a cross-layer modification of (1) ETL, (2) perovskite active layer and (3) theirs interface simultaneously. We find that the SnO 2 particles are dispersed into the ordered porous scaffold of Zr-MOF, to form an ETL with improved crystallinity , reduced defect states and increased contact area with active perovskite film. For the subsequently deposited perovskite layer, the crystallization along the vertical direction is significantly optimized, and the defects are passivated by the bottom-up infiltrated Zr-MOF, so as to suppress the ion migration process. The power conversion efficiency (PCE) of one-step fabricated Zr-MOF-modified MAPbI 3 based PSCs is optimized from 17.48% to 18.25%, and remaining 99% of its initial value after storage for 800 h under ambient conditions with the relative humidity over 60%. This work provides a simple cross-layer passivation strategy to improve the performance and stability of PSCs using highly designable MOF materials.
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高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Jin Yuan,Zhiwei He,Hongbo Zhang
Selective C–H bond oxidation of cyclohexane into KA oil (ketone-alcohol) is of vital importance in both fundamental research and industrial applications while limited by complex reaction network and suffering from low efficiency. In this study, Ce(OH)SO 4 · x H 2 O was chosen as a probe to systematically investigate the C–H bond activation and C–C bond rupture as a function of various reaction parameters, including the reactant/product concentrations, catalyst applied, reaction temperatures, acidic concentrations etc, and found that bi-molecule of C 6 H 12 was probably involved in both C–H bond rupture and C–C bond cleavage and both were controlled by one deprotonation elementary step with ·O 2 – and h + as the key active components, which were supported by parity fittings and primary KIEs determined. In addition, the C–C bond rupture was found to be mainly following C 6 H 10 O to ε-caprolactone and further to linear acids reaction path. Hopefully, this study could help people find/optimize reaction systems in selective hydrocarbon upgradings.
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Mengen Ma,Yilin Zeng,Yuzhao Yang,Cuiling Zhang,Yujiao Ma,Shaohang Wu,Chong Liu,Yaohua Mai
The wide-band-gap inorganic CsPbI2Br perovskite material provides a highly matched absorption range with the indoor light spectrum and is expected to be used in the fabrication of highly efficient indoor photovoltaic cells (IPVs) and self-powered low-power Internet of Things (IoT) sensors. However, the defects that cause nonradiative recombination and ion migration are assumed to form leakage loss channels, resulting in a severe impact on the open-circuit voltage (VOC) and the fill factor (FF) of IPVs. Herein, we introduce poly(amidoamine) (PAMAM) dendrimers with multiple passivation sites to fully repair the leakage channels in the devices, taking into account the characteristics of IPVs that are extremely sensitive to nonradiative recombination and shunt resistance. The as-optimized IPVs demonstrate a promising PCE of 35.71% under a fluorescent light source (1000 lux), with VOC increased from 0.99 to 1.06 V and FF improved from 75.21 to 84.39%. The present work provides insight into the photovoltaic mechanism of perovskites under full sun and indoor light, which provides guidance for perovskite photovoltaic technology with industrialization prospects.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jia Sun,Yinsheng Gu,Yingwei Lu,Juntao Hu,Tao Chen,Changfei Zhu,Paifeng Luo
Nowadays, the MA-FA mixed-cation perovskite solar cells (PSCs), demonstrating much higher stability than that of single-cation MAPbI 3 or FAPbI 3 , are still encountering a low-efficiency issue. The main reason is that there existing a lot of defects in SnO 2 electron transport layers (ETLs) and perovskite absorbers. Herein, we develop a synergistic strategy of Rubidium Chloride (RbCl) doping and 4- tert -butylbenzylammonium iodide (tBBAI) passivation to fabricate high-performance MA x FA 1-x PbI 3 mixed-cation PSCs. The alkali halide RbCl is first selected as a novel doping additive to regulate the film properties of SnO 2 and perovskites. Research shows that the negative Cl - ions can combine with uncoordinated Sn 4+ ions due to their strong bonding ability, which can passivate the oxygen-vacancy-related defects and enhance the charge transport of SnO 2 ETLs. Meanwhile, the doped Rb + and Cl - ions may diffuse into perovskite lattices to promote grain growth and reduce the defects of perovskites. Besides, we employ an organic halide salt tBBAI to passivate perovskites and suppress surface defects. Results of deep level transient spectroscopy (DLTS) indicate that SnO 2 and SnO 2 -RbCl based devices have deeper hole traps and large trap densities (Δ E = 0.92 eV, N T = 1.10 × 10 16 cm −3 ; ΔE = 0.93 eV, N T = 2.16 × 10 15 cm −3 ); while tBBAI-treated SnO 2 -RbCl-based devices own a shallower hole trap and a smaller trap density ( ΔE = 0.72 eV, N T = 2.44 × 10 13 cm −3 ); and the corresponding I Pb and I (MA/FA) antisite defeats are also identified. Therefore, our synergistic strategy is effectively able to reduce the defect density and suppress the non-radiative recombination. Consequently, the best-performance MA 0.85 FA 0.15 PbI 3 PSCs achieve an impressive power conversion efficiency (PCE) of 22.54% with a large open circuit voltage ( V oc ) of 1.16 V, which are by far the highest values of MA 0.85 FA 0.15 PbI 3 mixed-cation PSCs.
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高影响因子
Materials Today Energy
·
2023
·
IF 9.3
Ningjun Zhang,Jingsong Sun,Jiang Sheng,Weichuang Yang,Xiangying Xue,Luyan Zhang,Xuan Sha,Zhiqin Ying,Chunhui Shou,Xi Yang,Jichun Ye
Transparent conductive oxide (TCO) films are widely used for semitransparent perovskite solar cells (st-PSCs) and perovskite-based tandem solar cells due to their high optical transparency and good electrical conductivity . However, the high-power sputtering damage during the deposition of TCO film is a vital factor to prevent the perovskite-based solar cells from achieving high efficiency. In this work, we develop an ultrathin chromium oxide (CrO x ) buffer layer between the hole transporting layer (HTL) and indium-doped tin oxide (ITO) by trace-oxygen reactive thermal deposition (to-RTD). The experimental results show that the CrO x buffer layer can hinder the sputtering damage of ITO deposition and ensure a high-performance device, which can be attributed to the improved conductivity of the HTL/CrO x /ITO structure together with the tailored energy level alignment. In addition, this buffer layer with a thickness of 4 nm displays a high optical transmittance (>95%) in the interested wavelengths, meaning a limited optical parasitic absorption loss. As a result, the st-PSC with CrO x buffer layer achieves champion power conversion efficiency (PCE) of 19.06%, which is one of the highest PCEs for the n-i-p st-PSCs. Moreover, a four-terminal perovskite/silicon tandem solar cell featuring a CrO x buffer layer realizes a relatively high PCE of 27.48%.
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高影响因子
Solar RRL
·
2023
·Vol. 7
·期 11
·2300105
·
IF 7.9
Yifei Feng,Zhongbao Que,Shuaibo Zhai,Jintian Li,Jiaqi Gong,Ruiyuan Hu,Wei Liu,Jing Hu,Xing'ao Li,Liang Chu
Additive engineering has become an effective method to passivate the grain boundary defects of perovskite films for enhanced photovoltaic performance. Herein, inspired by daily life, a 502 adhesive is directly introduced into perovskite films to improve the power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs), where the perovskite grain boundaries are self-healed through spontaneous polymerization of the 502 adhesive by tracing water molecules in the air at room temperature. The C=O and –CN groups in 502 adhesive molecules provide double bonding points to chemically anchor with perovskite gain boundaries, which effectively block the invaded channels of moisture and oxygen into the perovskite film. Meanwhile, the –CN groups can combine with the deficient coordination of Pb 2+ to passivate the deep defects. The optimized PSCs via incorporation of 502 adhesive into perovskite film achieve PCE of 20.12% and remarkable long-term and moisture stability compared to the control device with PCE of 17.30%.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 12
·6556-6564
·
IF 11.9
Xuan Sha,Jiang Sheng,Weichuang Yang,Jingsong Sun,Chunhui Shou,Luyan Zhang,Ningjun Zhang,Zhiqin Ying,Xi Yang,Hongbin Zhao,Jichun Ye
The defects at the interface of the SnO2 electron transport layer (ETL) and the perovskite absorber, as the charge-carrier recombination centers, play an important role in determining the performance of perovskite solar cells (PSCs). Here, we use an organic salt, i.e., 1-ethyl-3-methylimidazolium diethyl phosphate (EMIM DEP), to passivate such defects, which could simultaneously enhance the interface quality and perovskite crystallization. The DEP groups saturate the dangling bonds of surface Sn atoms, efficiently suppressing the interfacial charge recombination and tailoring the energy alignment of the SnO2/perovskite interface for better carrier extraction. Additionally, EMIM DEP not only improves the crystal growth of perovskite, but also passivates the defects of the perovskite grain boundary. Consequently, the EMIM DEP-based device presents a champion power conversion efficiency (PCE) of 23.21%, which is much higher than that of the control device (21.14%). The EMIM DEP-based device retains 95% and 87% of its original PCE after storage for over 2000 h in a 30 ± 5% RH ambient air and under operation at the maximum power point for 700 h, respectively. Therefore, it is demonstrated that interface modification via such an organic salt is a feasible and efficient approach to improve the passivation and contact properties for high-efficiency and stable PSCs.
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高影响因子
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