MOLECULES
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2024
·Vol. 29
·期 13
·3126
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IF 4.2
Dong Li,Siyu Tian,Qiuhua Qian,Caiyun Gao,Hongfang Shen,Fei Han
Cesium doped WO3(Cs-WO3) photocatalyst with high and stable oxidation activity was successfully synthesized by a one-step hydrothermal method using Cs2CO3as the doped metal ion source and tungstic acid (H2WO4) as the tungsten source. A series of analytical characterization tools and oxygen precipitation activity tests were used to compare the effects of different additions of Cs2CO3on the crystal structure and microscopic morphologies. The UV–visible diffuse reflectance spectra (DRS) of Cs-doped material exhibited a significant red shift in the absorption edge with new shoulders appearing at 440–520 nm. The formation of an oxygen vacancy was confirmed in Cs-WO3by the EPR signal, which can effectively regulate the electronic structure of the catalyst surface and contribute to improving the activity of the oxygen evolution reaction (OER). The photocatalytic OER results showed that the Cs-WO3-0.1 exhibited the optimal oxygen precipitation activity, reaching 58.28 µmol at 6 h, which was greater than six times higher than that of WO3-0 (9.76 μmol). It can be attributed to the synergistic effect of the increase in the conduction band position of Cs-WO3-0.1 (0.11 V) and oxygen vacancies compared to WO3-0, which accelerate the electron conduction rate and slow down the rapid compounding of photogenerated electrons–holes, improving the water-catalytic oxygen precipitation activity of WO3.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Jingwei Du,Jinjun Li,Zhixiong You
This study explores the preparation of a Cs-doped Ru/ZrO 2 catalyst using a low eutectic system and its application in ammonia synthesis. Additionally, it examines the effect of Cs doping on enhancing the catalyst's resistance to hydrogen poisoning. Compared to the undoped Ru/ZrO 2 catalyst and the Cs–Ru/ZrO 2 –B catalyst prepared through the grinding method for promoter incorporation, the Cs–Ru/ZrO 2 -A catalyst synthesized using the low eutectic system demonstrated significantly enhanced activity. At 400 °C and 0.1 MPa, the Cs–Ru/ZrO 2 -A catalyst achieved an ammonia synthesis activity of 1769 μmol g cat −1 h −1 , which is approximately 35 times higher than that of the undoped Ru/ZrO 2 catalyst. The structure of the catalyst was analyzed using various material characterization techniques, including XRD, XPS, and SEM. The results showed that the Cs–Ru/ZrO 2 -A catalyst, prepared under identical conditions, exhibited no significant structural differences compared to other catalysts. However, further TPR and TPD analyses revealed that Cs interacts with Ru to some extent, affecting its reduction behavior and enhancing the catalytic reaction rate for ammonia synthesis. Additionally, detailed XPS analysis of all catalysts was conducted, leading to a proposed relationship between the catalytic reaction rate and the oxidation states of the metal components. The study revealed that the presence of Cs significantly inhibits hydrogen poisoning of the catalyst. Furthermore, it demonstrated that the addition of promoters enhances H 2 dissociation by supplying electrons to the active metal Ru, while Cs plays a crucial role in effectively suppressing hydrogen poisoning.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Fangfang Huang,Fengzhen Lv,Danruoyu Wang,Yuan Gao,Tao Wang,Jun Liu,Xuedong Tian,Fuchi Liu,Lizhen Long
A series of (CH3NH 3 ) 2- x Cs x AgBiBr 6 films ( x =0, 0.1, 0.2, 0.3, 0.4) were fabricated on ITO/glass substrates through the sol-gel method. 15 % Cs doping ( x =0.3) was the optimal condition for enhancing the film quality and achieving nonvolatile bipolar resistive switching (BRS) performance in the devices. The on/off ratio in the (CH 3 NH 3 ) 1.7 Cs 0.3 AgBiBr 6 (Cs-MAABB-3)-based RS device reached 7.7×10 4 , high and low resistance states were maintained for over 10 4 s. Under different light intensities with a wavelength of 430 nm, six distinct resistance states were recorded at −0.3 V in the Au/Cs-MAABB-3/ITO/glass device. These multilevel states remained after 5000 s and 650 cycles, indicating the excellent retention and endurance of multilevel RS memory in the Au/Cs-MAABB-3/ITO/glass device. The RS behavior in this device followed the trap-controlled space charge-limited current and conductive filament models. Cs-doping increased the concentration of intrinsic vacancies appropriately, leading to a more prominent RS effect. With varying intensities of illumination, the change of Schottky-like barrier at the Au/Cs-MAABB-3 interface, modulated by the photo-induced carriers, affected the multilevel resistance states in the device. The excellent multilevel RS performance was observed for the first time in the Cs-MAABB-3-based device. It presents broad possibilities for improving high-density memory in lead-free halide double perovskite-based devices.
研究领域:
材料科学
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电子工程
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DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 11
·4942-4947
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IF 6.97
Xian-gang Wu,Jialun Tang,Feng Jiang,Xiaoxiu Zhu,Yanliang Zhang,Dengbao Han,Lingxue Wang,Haizheng Zhong
Perovskite quantum dots (PQDs) are emerging as functional luminescence down-shifting materials for light conversion applications. The incorporation of PQDs into a polymeric matrix is a key step to improving their stability, thus facilitating device integration. Compared to the conventional way of mixing the pre-synthesized PQDs into a polymer, the in situ fabrication of perovskite quantum dots-embedded composite films (PQDCFs) is an efficient and cost-effective method, which yields enhanced photoluminescence properties. This method has been successfully developed for green emissive CH3NH3PbBr3 PQDCFs, whereas the red CH3NH3PbI3 PQDCFs only show the photoluminescence quantum yields (PLQYs) less than 15%. By means of combining transmittance electron microscopy (TEM) and absorption spectrum analysis, we showed that the “perovskite red wall” in PQDCFs was mainly related to the phase separation, formation of large-sized particles and incomplete chemical conversion of precursors. These problems are caused by the solubility variance of perovskite precursors in the solvent as well as the solvation compatibility between perovskite precursors and the polymer during the crystallization process. Based on these findings, we introduced Cs+ as a dopant and 3,3-diphenylpropyamine (DPPA) as capping ligands, respectively, to decrease the solubility variance of the precursors and improve the compatibility between PQDs and the polymer. Consequently, highly luminescent red emissive PQDCFs with a PLQY of 91% were achieved with this strategy.
研究领域:
材料科学
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光学工程
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DOI
PubMed
高影响因子
National Science Review
·
2022
·Vol. 9
·期 10
·
IF 23.178
Chen Haoran,Wang Yong,Fan Yingping,Chen Yuetian,Miao Yanfeng,Qin Zhixiao,Wang Xingtao,Liu Xiaomin,Zhu Kaicheng,Gao Feng,Zhao Yixin
Although pure formamidinium iodide perovskite (FAPbI3) possesses an optimal gap for photovoltaics, their poor phase stability limits the long-term operational stability of the devices. A promising approach to enhance their phase stability is to incorporate cesium into FAPbI3. However, state-of-the-art formamidinium–cesium (FA–Cs) iodide perovskites demonstrate much worse efficiency compared with FAPbI3, limited by the different crystallization dynamics of formamidinium and cesium, which result in poor composition homogeneity and high trap densities. We develop a novel strategy of crystallization decoupling processes of formamidinium and cesium via a sequential cesium incorporation approach. As such, we obtain highly reproducible, highly efficient and stable solar cells based on FA1–xCsxPbI3 (x = 0.05–0.16) films with uniform composition distribution in the nanoscale and low defect densities. We also revealed a new stabilization mechanism for Cs doping to stabilize FAPbI3, i.e. the incorporation of Cs into FAPbI3 significantly reduces the electron–phonon coupling strength to suppress ionic migration, thereby improving the stability of FA–Cs-based devices.
研究领域:
材料科学
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光伏技术
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物理化学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xinsheng Li,Katam Srinivas,Manigandan Ramadoss,Fei Ma,Yue Wang,Mengya Wang,Hesheng Yu,Ziheng Zhang,Yu Wu,Yuanfu Chen
The sluggish kinetics of oxygen evolution reaction (OER) becomes one of the big obstacles for large-scale electrolytic water splitting. It is urgent to develop low-cost and efficient OER catalyst with fast reaction kinetics and low energy barrier. Herein, a novel OER catalyst of carbon nanotubes (CNT) supported cesium-doped NiFe-layered double hydroxide nanosheets (Cs–NiFe-LDH) is synthesized via a facile one-pot solvothermal reaction. The porous Cs–NiFe-LDH@CNT catalyst delivers an ultralow overpotential of 240 mV @10 mA cm −2 , a small Tafel slope of 56.22 mV dec −1 , and excellent long-term stability. The outstanding catalytic performance is mainly attributed to the synergistic effects of Cs doping and CNT network: the modification of the electronic structure of NiFe-LDH by Cs doping and the conductivity enhancement by CNT network can facilitate the electron transfer and kinetics; the Cs doping and CNT introduction can generate rich active sites; the nanoporous architecture can facilitate the ion diffusion and O 2 bubble release. This work provides a synergistic strategy to design and synthesize transition metal based OER catalysts with low-cost, fast kinetics and good stability for water splitting.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Nanoscale Advances
·
2021
·Vol. 3
·期 11
·3177-3183
·
IF 4.553
Yang Wang,Zhendong Yan,Mengfei Zhang,Zheng Zhang,Ting Li,Mingqing Chen,Weifu Dong
Cesium-doped tungsten bronze CsxWO3 (CWO) is an ideal near infrared (NIR) shielding material for solar filters. However, the NIR shielding ability of CWO-dispersed films easily deteriorates in hot humid environments, which severely hinders the commercial application of CWO. In this paper, UV/NIR shielding nanocomposite films were prepared by dispersing core–shell structured CWO@polydopamine (CWO@PDA) in a poly(vinyl alcohol) matrix. Because of the strong ultraviolet light absorption ability of PDA, it can shield ultraviolet light, which is generally detrimental to our health. The prepared nanocomposite films can efficiently shield 88.3% UV and 85.5% NIR radiation even though they show relatively high transparency in the visible range. Importantly, the good protection of the continuous PDA shells played an important role in enhancing the stability of CWO nanoparticles. The nanocomposite films also exhibit excellent stability in hot humid environments. Therefore, core–shell structured CWO@PDA nanoparticles have great potential as a novel UV/NIR shielding material for the development of efficient energy-saving windows.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 37
·5510-5518
·
IF 3.304
Qingxian Li,Yucheng Liu,Yunxia Zhang,Mingxin Hu,Zhou Yang,Shengzhong (Frank) Liu
Among the various developed perovskite materials, HC(NH2)2PbI3 (FAPbI3) is considered one of the best photovoltaic materials due to its high thermal stability and smaller band gap for light harvesting over a broader spectrum. However, the relatively large size of HC(NH2)2+ (FA) makes HC(NH2)2PbI3 prone to a phase transition from its black phase to the yellow phase at room temperature. Reduction of the effective ion size by doping with smaller ions is an effective way to stabilize black-phase FAPbI3. However, the effect of dopants on the optoelectronic properties of doped formamidinium lead halide perovskites has rarely been investigated. In this work, we prepared Cs-, Br- and Cs–Br co-doped FAPbI3 single-crystal materials with doping concentrations of 5%, 10% and 15%. The impacts of dopants on the phase stability, trap state density, carrier lifetime and carrier mobility are thoroughly investigated. It is found that Cs doping is not effective at stabilizing the black phase, while Br is a good stabilizer at concentrations exceeding 6.7%. Furthermore, the Cs and Br co-doped samples could be synergistically enhanced for high performance optoelectronics and show not only better stability but also much improved carrier lifetimes of 1.23 μs and carrier mobilities of 427.3 cm2 V−1 s−1, which resulted in a longer carrier diffusion length of approximately 30 μm as well as a photodetector with a high responsivity of 0.64 A/W.
研究领域:
材料科学
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光电子学
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DOI
高影响因子
Catalysis Science & Technology
·
2018
·Vol. 8
·期 17
·4430-4439
·
IF 5.365
Ziliang Yuan,Bing Liu,Peng Zhou,Zehui Zhang,Quan Chi
The selective oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF) has attracted much attention in recent years. Cesium-doped manganese dioxide (Cs/MnOx) was prepared by a soft template method, and was found to be active for the selective oxidation of HMF to DFF with molecular oxygen. Various reaction conditions have been investigated, and DFF was attained with a high yield of 94.7% at a HMF conversion of 98.4% at 100 °C and 10 bar O2 in N,N-dimethylformamide. Cs/MnOx demonstrated much higher catalytic activity than un-doped MnOx, suggesting that the introduction of Cs into MnOx plays a crucial role in the oxidation of HMF to DFF. Kinetic studies demonstrated that the oxidation of HMF to DFF depends on both the HMF and oxygen concentration, with the reaction order being 0.44 and 0.53, respectively. Compared with other heterogeneous non-noble metal catalysts, Cs/MnOx demonstrated a much lower activation energy for the oxidation of HMF to DFF. The catalyst can be reused without much loss of catalytic activity, suggesting that the catalyst is highly stable. Furthermore, the direct production of HMF from fructose was also successfully realized by a one-pot reaction strategy via two consecutive steps.
研究领域:
化学工程
·
催化材料科学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Yanfang Tao,Yanyan Li,Meng He,Xiandong Zhao,Xiaojie Yang,Jinmao Li,Li Zhao,Yang Li,Shimin Wang
Solar energy conversion into electricity through photovoltaic technology represents an environmentally friendly way of utilizing renewable energy sources for sustainable energy production. Low-cost and highly stable Sb2S3 solar cells are considered promising photovoltaic materials. However, Sb2S3 solar cells are currently facing problems such as poor electron transport capacity and grain boundary defects. In this work, an Sb2S3 precursor solution is prepared by the sol–gel method, to which a small amount of cesium is added for doping the light absorbing layer. By exploring the doping concentration, the optimal doping concentration of 0.05% is obtained. The doped Sb2S3 exhibits improved crystallinity, reduces surface roughness, increases particle size, decreases grain boundaries, and enhances carrier transport capacity, which is reflected in the increased open-circuit voltage (Voc = 0.678 V), short-circuit current density (Jsc = 15.92 mA/cm2), and power conversion efficiency (PCE = 4.81%). Cs doping effectively suppresses recombination centers by forming S–Cs metal bonds, thereby reducing impurities and reducing film surface defects, which collectively enhance the quality of Sb2S3 films. This study provides valuable insights and strategies for the further modification and optimization of Sb2S3 solar cells.
研究领域:
材料科学
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光伏技术
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半导体物理
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无机化学
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能源材料
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产品关联
DOI
高影响因子
Carbon Energy
·
2023
·Vol. 6
·期 3
·e447
·
IF 20.5
Mengmeng Ma,Jingzhen Li,Xiaogang Zhu,Kong Liu,Kaige Huang,Guodong Yuan,Shizhong Yue,Zhijie Wang,Shengchun Qu
Graphitic carbon nitride (g-C 3 N 4 ) has been extensively doped with alkali metals to enlarge photocatalytic output, in which cesium (Cs) doping is predicted to be the most efficient. Nevertheless, the sluggish diffusion and doping kinetics of precursors with high melting points, along with imprecise regulation, have raised the debate on whether Cs doping could make sense. For this matter, we attempt to confirm the positive effects of Cs doping on multifunctional photocatalysis by first using cesium acetate with the character of easy manipulation. The optimized Cs-doped g-C 3 N 4 (CCN) shows a 41.6-fold increase in visible-light-driven hydrogen evolution reaction (HER) compared to pure g-C 3 N 4 and impressive degradation capability, especially with 77% refractory tetracycline and almost 100% rhodamine B degraded within an hour. The penetration of Cs + is demonstrated to be a mode of interlayer doping, and Cs–N bonds (especially with sp 2 pyridine N in C═N–C), along with robust chemical interaction and electron exchange, are fabricated. This atomic configuration triggers the broadened spectral response, the improved charge migration, and the activated photocatalytic capacity. Furthermore, we evaluate the CCN/cadmium sulfide hybrid as a Z-scheme configuration, promoting the visible HER yield to 9.02 mmol g −1 h −1 , which is the highest ever reported among all CCN systems. This work adds to the rapidly expanding field of manipulation strategies and supports further development of mediating served for photocatalysis.
研究领域:
材料科学
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化学
·
环境科学
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能源科学
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DOI
高影响因子
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