Small
·
2024
·Vol. 20
·期 34
·2401914
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IF 13
Zhaohui Fang,Xiaoyang Yue,Quanjun Xiang
Metal halide perovskite quantum dots (QDs) are widely studied in the field of photocatalytic CO 2 due to their strong light absorption and long carrier migration length. However, it can not exhibit high catalytic performance because of the radiative recombination and the lack of effective catalytic sites. Metal organic frameworks (MOFs) encapsulated QDs can not only solve the aforementioned problems, but also maintain their own unique characteristics with ultra-high specific surfaces area and abundant metal sites. In this work, lead-free bismuth-based halide perovskite QDs are encapsulated into Zr-based MOF (UiO-66), which combines the advantages with high power conversion efficiency of QDs and the high surface area and porosity of UiO-66. In addition, benefiting from the close contact between the Cs 3 Bi 2 Br 9 QDs and the UiO-66 enables the photogenerated electrons in the QDs to be rapidly transferred to the MOF. As a result, the Cs 3 Bi 2 Br 9 @UiO-66 composite exhibits a higher yield for photocatalytic CO 2 reduction than that of the prepared large-sized composite of Cs 3 Bi 2 Br 9 and UiO-66.
研究领域:
材料科学
·
环境科学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yalin Yang,Zheyan Chen,Hanlin Huang,Yuxin Liu,Junhua Zou,Shuqi Shen,Jiawei Yan,Jinshui Zhang,Zanyong Zhuang,Zhongzhen Luo,Chengkai Yang,Yan Yu,Zhigang Zou
Halide perovskites and derivatives have been used as emerging photocatalysts due to their unique optoelectronic and structural diversity. However, compared with the well-explored photophysical processes for light-driven more energetic carriers to trigger redox reactions, catalytic effects on the surface of halide perovskite or their derivatives for chemical transformations between reactive species are seldom addressed, which is equally important for improving the efficiency for halide perovskite-based photocatalysts. Here, we demonstrate that Cs 3 Bi 2 Br 9 sites in the Cs 3 Bi 2 Br 9 /CdS heterojunction, not only participate in light-driven processes, but also play a vital role for the activation and conversion of key intermediates during C(sp 3 )-H bond transformation, via a more thermodynamically and kinetically favorable surface reaction pathway. Besides, various aromatic hydrocarbons can be effectively photocatalytic converted to corresponding aldehydes/ketones as major products. This work highlights the importance of surface catalysis mechanism in photocatalysis not only for halide perovskites but also for other semiconductors.
研究领域:
材料科学
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化学工程
·
光化学
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DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 18
·6212-6219
·
IF 6.4
Pengfei Zhao,Mingqing Cui,Yanting Li,Jie Lao,Chunli Jiang,Chunhua Luo,Bobo Tian,Hechun Lin,Hui Peng,Chun-Gang Duan
The visual perception system undertakes nearly 80% information perceiving tasks and its importance to human beings is self-evident. An optoelectronic synapse as the basic unit of artificial visual perception system not only incorporates photosensitive functions and synaptic plasticity, but also possesses the prospective advantages of high bandwidth, neglectable crosstalk and low-power dissipation. In this work, a two-terminal and self-powered optoelectronic synaptic device based on a 2D lead-free perovskite, Cs3Bi2Br9, was fabricated. Upon optical stimulation, the device exhibits typical synaptic behaviors, including paired-pulse facilitation (PPF), transformation from short-term plasticity (STM) to long-term plasticity (LTM) and dynamic filtering via optical modulation. Furthermore, the optical stimulus-induced versatile criteria including threshold, relaxation, allodynia and hyperalgesia, of a nociceptor can be mimicked by the device under self-biased conditions. Such multifunctionality of the device could be put down to the unique optoelectronic properties of two-dimensional Cs3Bi2Br9 and the interfacial trapping of dielectric poly(methyl methacrylate) layers. This work provides an energy-efficient approach for constructing retinal-neuromorphic systems.
研究领域:
材料科学
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神经科学
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生物医学工程
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Yuan Yu,Yuhang Yang,Yujia Tian,Yanyong Li,Tingting Han,Ya-Kun Wang,Yue Yuan,Kun Zhou,Xuying Liu,Mario Lanza,Fei Hui,Li Zhang
Halide perovskite-based memristors have demonstrated great potential in neuromorphic computing, yet their performance remains severely limited by poor stability arising from its abundant grain boundaries and intrinsic defects. In this work, we report lead-free Cs 3 Bi 2 Br 9 perovskite-based memristors enabled by interfacial engineering with molybdenum disulfide (MoS 2 ). Acting as a growth template, MoS 2 effectively induces the formation of perovskite films with enhanced crystallinity, superior interface quality, and suppressed defects. The constructed Au/Ag/Cs 3 Bi 2 Br 9 /MoS 2 /ITO memristive device achieves typical self-rectifying behavior with an ultra-low set voltage of ∼0.14 V, low set power consumption of 140 nW, and low energy of 300 pJ. Meanwhile, the device demonstrates exceptional cycling stability and low device-to-device variability (C V < 6.37%). The experimental and theoretical fittings reveal that the resistive switching mechanism is governed by an Ag + -assisted trap-controlled electronic transport, while the reinforced built-in electric field endows the device with pronounced self-rectifying characteristics, thereby effectively suppressing sneak currents in crossbar arrays. The device successfully emulates key nociceptive behaviours of biological pain receptors, including threshold response, adaptation, and hyperalgesia. This study highlights the interfacial engineering enables synergistic optimization of crystallinity and defect states. These findings provide new insights into the design of lead-free perovskite-based memristors for bioinspired neuromorphic sensory systems.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xiuqing Cao,Wenfei Li,Qingqing Zheng,Juan Meng,Leilei Yang,Libin Wang,Yuyang Huang,Shoulei Xu,Wen Deng
The development of energy-efficient and biocompatible artificial synapses is essential to advance neuromorphic computing. Bismuth-based perovskites are promising candidates to replace toxic lead-based perovskites in resistive switching devices owing to their exceptional optoelectronic properties, high environmental friendliness, and stability. Here, we present a lead-free Cs3Bi2Br9/NiO heterostructure memristor capable of mimicking biological synaptic functions with exceptional robustness. By engineering a heterostructure with a NiO layer, ion migration in Cs3Bi2Br9 is spatially confined, achieving a resistance switching change rate of less than 7.37% between cycles and enhanced long-term stability in ambient air (60 days). This Cs3Bi2Br9/NiO memristor exhibits excellent stability, impressive memory retention time (>7 × 103 s), durability (>100 cycles), good on/off ratio, and basic synaptic behavior. Furthermore, the training results of 200 data achieved an accuracy rate of 95.46% in the MNIST handwritten digit recognition task, which was superior to traditional analog neural networks. This work not only highlights the significant potential of lead-free perovskites for sustainable neuromorphic hardware but also provides a scalable preparation path for biocompatible electronics.
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PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhihong Liu,Jiale Liu,Jin Wang,Ping Lu,Shishun Xu,Yi Lu,Xiaofei Li,Qiaowen Zhang,Guocan Jiang,Zhengquan Li
The urgent need for clean energy has driven extensive research into efficient photocatalytic systems for CO 2 reduction. Lead-free Cs 3 Bi 2 Br 9 perovskites are particularly promising in this context, yet the photocatalytic performance of single-component Cs 3 Bi 2 Br 9 is often hindered by its narrow absorption in visible-light range. Here, we present a visible-to-near-infrared (vis-to-NIR) responsive Cs 3 Bi 2 Br 9 /Bi 19 Br 3 S 27 Z -scheme heterojunction photocatalyst, achieved by creating a high-quality interface upon in-situ growth. This heterojunction design markedly boosts CO₂-to-methane conversion, achieving electron consumption rates that are 70 and 124 times higher than those of pristine Cs 3 Bi 2 Br 9 and Bi 19 Br 3 S 27 , respectively. Mechanistic studies indicate that the formation of a strong built-in electric field at the interface facilitates efficient charge separation and transfer, significantly boosting photocatalytic performance. Notably, the photocatalytic performance of Cs 3 Bi 2 Br 9 /Bi 19 Br 3 S 27 heterojunction surpasses that of most lead-free halide perovskite photocatalysts. Our findings offer a new paradigm for interface engineering in photocatalysis and advance the development of vis-to-NIR responsive perovskites for sustainable energy conversion.
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高影响因子
Journal of Marine Science and Engineering
·
2023
·Vol. 11
·期 5
·1001
·
IF 2.9
Yuefeng Gao,Baojiu Chen
Seawater pollution caused by heavy metal ions is a growing concern among the public. Perovskite quantum dots (PeQDs) are ideal probes for detecting metal ions due to their exceptional sensing characteristics, including remarkable sensitivity, low detection limit, and good selectivity. However, traditional lead-based PeQDs exhibit drawbacks related to lead toxicity and poor water stability. Herein, lead-free halide PeQDs Cs3Bi2Br9were synthesized using Bi3+instead of Pb2+via the ligand-assisted reprecipitation method. The luminescence performance of the precursor is analyzed with respect to the reaction conditions. The results reveal that the optimal reaction temperature is 80 °C, the ideal octylamine dosage is 35 μL, and the most effective reaction time is 10 min. Photoluminescence spectra of Cs3Bi2Br9are analyzed at various temperatures and demonstrate that fluorescence intensity decreases as temperature increases. The value of the exciton binding energy (Eb) is determined to be 88.6 meV. Cs3Bi2Br9PeQDs synthesized under the optimum reaction conditions are utilized as fluorescent probes to detect copper ions in seawater. Results from experiments demonstrate that the presence of copper ions markedly quenched the photoluminescence of Cs3Bi2Br9owing to the effective transfer of electrons from Cs3Bi2Br9to Cu2+. A strong linear correlation between the degree of quenching and the contents of Cu2+is observed. Cs3Bi2Br9PeQDs demonstrate a sensitivity and detection limit of 1.21 μM−1and 98.3 nM, respectively. Furthermore, this probe exhibits good photostability, water stability, and selectivity for copper ions, thereby indicating its potential for detecting marine heavy metal contaminants.
研究领域:
环境科学
·
材料科学
·
分析化学
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 12
·3688-3695
·
IF 6.641
Mingyang Gao,Chi Zhang,Linyuan Lian,Jianwei Guo,Yong Xia,Fan Pan,Xiaoming Su,Jianbing Zhang,Honglang Li,Daoli Zhang
Metal halide nanocrystals (NCs) have attracted intensive interest due to their unique optical properties and cheap synthesis which endows them with tremendous potential for application in the field of optoelectronic devices. However, lead toxicity obstructs their commercialization. Therefore, environment- and consumer-friendly all-inorganic lead-free perovskite NCs are highly desirable in terms of application, and recent efforts have investigated lead-free halide perovskite NCs. Herein, in this present work, all-inorganic Cs3Bi2Br9 perovskite NCs were synthesized for the first time with a weak-polar solvent at room temperature (WPRT). As-synthesized Cs3Bi2Br9 perovskite NCs demonstrated blue dual-emission peaks at 414 nm and 433 nm with a full width at half-maximum (FWHM) of 50 nm and a photoluminescence quantum yield (PLQY) up to 29.6%. Notably, the NCs exhibited high stability upon air exposure exceeding three weeks since the trap states could be passivated under humid conditions. Furthermore, it was also found that potassium oleate (K-OA) solution could enhance the PLQY of Cs3Bi2Br9 perovskite NCs.
研究领域:
材料科学
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光学
·
纳米技术
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Wanwan Wu,Linjie Song,Yinqi Qiao,Yan Bai,Xue Liu,Haiyan Li,Dongbin Dang
Developing efficient photocatalysts for the conversion of CO 2 into value-added chemicals is considered as an ideal strategy to handle the energy crisis and environmental pollution. Among the numerous candidate materials, lead-free perovskite Cs 3 Bi 2 Br 9 has attracted significant research interests in CO 2 photoreduction because of its excellent reducing power and controllable product selectivity. In this work, we developed a novel Cs 3 Bi 2 Br 9 /Ta 2 O 5 composite via the in-situ growth of Cs 3 Bi 2 Br 9 on the porous Ta 2 O 5 , which exhibits excellent dual functionalities of CO 2 capture and conversion. The optimized sample T2 achieved a CO photoreduction yield of 413.45 μmol g −1 h −1 without adding any sacrificial agents, which is 4.7 and 22.3 times higher than that of pure Cs 3 Bi 2 Br 9 and Ta 2 O 5 , respectively. The markedly improved photocatalytic performance arises from a type-II heterojunction charge transfer pathway generated between Cs 3 Bi 2 Br 9 and Ta 2 O 5 , which drives the highly efficient separation and transfer of charge carriers, as confirmed by the enhanced photocurrent response and quenched PL intensity. Furthermore, the achieved composite also exhibited remarkable stability, as evidenced by the well-maintained structural integrity of the material after a 24-hour cycling test. This study provides key insights for developing novel lead-free perovskite-based photocatalysts, which has significant scientific and application value for achieving carbon neutrality goals.
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高影响因子
ACS Applied Materials & Interfaces
·
2026
·Vol. 18
·期 31
·43333-43344
·
IF 7.8
Xu Longjun,Wang Xinyue,Xu Longqing,Zhang Weiqiang,Hu Baoye,Wei Zhengrong,Chu Ya,Pan Fuxing,Zhao Jinsheng
Lead-free halide perovskites have attracted considerable attention as promising optoelectronic materials owing to their low toxicity and tunable electronic structures. However, poor stability and an insufficient understanding of excited-state regulation remain major challenges. A synergistic Rb + /Sb 3+ codoping strategy is employed here to construct a series of highly stable Cs 3 Bi 2 Br 9 :x%Rb + ,25%Sb 3+ ( x = 3, 5, 8, and 10) microcrystals. Structural characterization has shown that codoping forms a relatively stable perovskite structure. Spectroscopic experiments have identified that Sb 3+ substitution enhances electron–phonon coupling and strengthens the formation of self-trapped excitons (STEs), and Rb + modifies STE relaxation dynamics and suppresses radiative recombination to improve carrier utilization efficiency. Femtosecond transient absorption (fs-TA) indicates controlled excited-state evolution and enhanced charge-transfer characteristics. Therefore, Cs 3 Bi 2 Br 9 :x%Rb + ,25%Sb 3+ has achieved a hydrogen evolution rate of 144 μmol·g −1 h −1 , which is 5.8 times higher than that of pristine Cs 3 Bi 2 Br 9 , and after adding Pt, this rate further increased to 393 μmol·g −1 h −1 due to accelerated charge separation and proton reduction. This paper proposes a structure-excited state-function relationship and shows how to optimize photocatalytic hydrogen evolution in lead-free perovskites by exciton engineering.
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高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 16
·5934-5940
·
IF 5.7
Tianyu Wang,Shuwen Xin,Yaoyu Liu,Zongshuai Ji,Guanfeng Liu,Shuai Zhang,Tianhua Wang,Fengyun Wang,Bing Teng,Shaohua Ji
Metal halide perovskites are extensively utilized in photoluminescence and photoelectric detection, owing to their modifiable band gap, elevated quantum yield, high absorption coefficient, superior charge transport properties, versatile chemical synthesis, and cost-effective manufacturing. Among the perovskite variants, bismuth–halide perovskites have emerged as a promising lead–halide alternative, garnering increasing interest for crafting non-toxic perovskites in optoelectronic applications. Nonetheless, the rapid and straightforward production of high-quality single crystals remains a challenge. This paper introduces an enhanced antisolvent crystallization method for fabricating high-quality Cs3Bi2Br9 single crystals measuring 3 × 3 mm. These crystals exhibit a remarkably low half-peak width of the X-ray diffraction swing curve at just 0.048°, maintaining stability without phase decomposition for 180 days at room temperature under air exposure. The photodetector constructed involves an aluminum electrode deposited onto the crystal surface. Utilizing 375 nm ultraviolet light as the excitation source, the device demonstrates a swift electrical response (sensitivity: 8.41 × 102), achieving the rise and decay times of the Cs3Bi2Br9 single crystal detector of 96 and 80 milliseconds, respectively. This research holds significant promise for advancing perovskite crystal preparation and photodetection techniques, particularly in the realm of bismuth-based perovskites.
研究领域:
材料科学
·
光电技术
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DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Biao Zhou,Jiayi Li,Yanan Chong,Tan Li,Xinyu Yang,Keyou Yan
Controlling the exposure of anisotropic crystal facets provides a promising strategy to direct the migration of photogenerated charges and improve photocatalytic performance. Nevertheless, the underlying charge dynamics resulting from facet engineering in 2D Cs 3 Bi 2 Br 9 vacancy-ordered perovskite remain poorly understood. Herein, we synthesize two distinct morphologies of Cs 3 Bi 2 Br 9 single crystals (nanosheets and nanostrips) with different ratios of exposed (001) to elucidate this mechanism. Surface photovoltage mapping, selective photodeposition, and DFT calculations jointly confirm the existence of anisotropic charge separation driven by an intrinsic facet junction electric field (∼180 meV). This electric field directs photogenerated holes to accumulate on the (001) facets for toluene activation, while electrons migrate to the (010) facets. Benefiting from this intrinsic facet junction, medium-sized Cs 3 Bi 2 Br 9 nanosheets with optimal (001) facet exposure achieve a high benzaldehyde production rate of 692 µmol·g −1 ·h −1 with 87% selectivity, significantly outperforming other morphologies. This work provides the first demonstration of facet engineering in Cs 3 Bi 2 Br 9 , establishing a crystal-orientation design principle for efficient and selective photocatalytic organic transformations.
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高影响因子
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