Journal of Materials Chemistry A
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2025
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IF 9.5
Li-Yuan Wu,Fei Zhang,Ming-Zhe Cai,Min Zhang,Tong-Bu Lu,Ping Li,Yong-Hua Chen
Z-Scheme heterojunctions with strong redox capability and efficient photoinduced carrier separation are critical for sunlight-driven CO2 conversion, yet their optimal structural arrangement remains to be improved. Herein, we report a 2D/2D CsPbBr3/SnS2 nanosheet hybrid system featuring an extensive interfacial contact area that facilitates photoinduced carrier transfer. The inbuilt electric field directs photoinduced electrons to accumulate on CsPbBr3, while holes migrate to SnS2, thereby enhancing their respective redox capabilities. This system achieves a maximum CO rate of 75.6 µmol g−1 h−1, representing a 32.8-fold and 3.5-fold improvement compared to pristine 2D SnS2 and CsPbBr3–OA, respectively. Electrochemical characterization reveals that interlayer hybridization synergistically enhances both interfacial carrier transfer and surface redox ability. The electrostatic assembly approach enables the controlled synthesis of various CsPbBr3/SnS2 composites with tunable SnS2 ratios, providing a generalizable strategy for the precise fabrication of dual crystal facet-exposed catalysts.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Sha Shi,Jihui Wang,Chunhong Xu,Jie Mao,Yaohui Bai
Carbamazepine (CBZ), a typical pharmaceutical and personal care product (PPCP), has an annual global consumption exceeding several thousand tons. Its molecular structure contains symmetrical nitrogen-containing aromatic heterocycles, which resist degradation by conventional biochemical methods, resulting in persistent aquatic pollution. Integrating photocatalytic processes with Fenton reaction provides a targeted approach for its effective elimination from aquatic systems. However, traditional photo-Fenton systems suffer from inefficient Fe 3+ /Fe 2+ redox cycling due to sluggish Fe³⁺ regeneration and rapid recombination of photogenerated charge carriers. To address these challenges, this study designed a facet-engineered BiVO 4 photocatalyst through selective deposition of FeOx nanoparticles on the electron-rich (010) facets of monoclinic BiVO 4 via hydrothermal and photodeposition methods. The optimized FeOx/BiVO 4 composite exhibited exceptional degradation performance for CBZ, achieving a rate constant of 0.317 min -1 , which is 24-fold higher than that of pristine BiVO 4 . Mechanistic investigations revealed that the selective FeOx deposition not only promoted the valence-state transition of Fe 3+ to Fe 2+ but also enhanced charge carrier separation, thereby establishing a sustainable Fe 3+ /Fe 2+ redox cycle. Electron paramagnetic resonance (EPR) analysis and radical quenching experiments further identified hydroxyl radicals (·OH) as the dominant reactive species. This work provides a paradigm for designing efficient photo-Fenton reaction systems through targeted facet engineering, offering broad implications for the remediation of PPCPs.
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ACS Photonics
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2025
·
IF 6.7
Yaqian Yuan,Zhongle Chen,Zhongkai Guo,Hai-Qiao Wang,Chong Geng,Shu Xu
Recent advancements in quantum dot (QD)-converted light-emitting diodes (Qc-LEDs) require on-chip deposition of mixed QDs to achieve a wide color gamut and efficient displays. However, high QD concentrations lead to significant near-field energy transfer, causing fluorescence quenching and color shifting. A thorough understanding of energy transfer dynamics between QDs is essential for minimizing energy loss and color variation in Qc-LEDs. In this study, we investigate the energy transfer processes between various green-emitting QDs and red-emitting quantum rods (QRs), focusing on how their heterostructure and morphology influence the energy transfer kinetics. Through steady-state and transient photoluminescence and absorption measurements, we identify a bidirectional energy transfer between QDs and QRs at high concentrations, influenced by their concentration, morphology, and band alignment within the heterostructures. By optimizing parameters such as rod length, QD structure, and concentration, we identify the ideal configuration of mixed QDs and QRs that maximizes system efficiency. These results provide valuable insights into the design of mixed QD systems, offering strategies to optimize light conversion in Qc-LEDs and advance the development of high-performance displays.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Jing Yang,Ying Duan,Lixu Wang,Wangchuan Xiao,Qiao rong Ru,Peng Li,Shenjie Zhang,Zheng Sun
Host-guest systems of carbon dots (CDs) embedding in matrix with room-temperature afterglow (RTA) are of great importance for various applications, but so far rather limited due to relaying on high-energy ultraviolet (UV) excitation, monochromatic afterglow emission, or harsh synthesis. Herein, PTA materials (PASP@BA) with UV/visible light dual-mode excitation are prepared via one-step heat treatment of polyaspartic acid (PASP) and boric acid (BA). The RTA colors of PASP@BA display a significant bathochromic shift from blue to yellow as the excitation wavelength increases from 254 to 420 nm under ambient condition. Impressively, the visible-light-activated ultralong RTA can last for about 7 s by naked eye under ambient conditions. By correlating photophysical properties with structural characterization results, it is concluded that the polycrystalline boron oxide matrix and covalent B–C bonds can effectively suppress non-radiative transitions and stabilize the triplet excited state of CDs by restricting molecular motion and isolating environmental quenchers, thus facilitating the generation of long afterglow. More interestingly, the afterglow color can be also tuned by dynamic varying in B–C bond density and CDs dimensions. Finally, practical applications of such photo-responsive systems in multi-level information anti-counterfeiting and encryption are further demonstrated.
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OPTICAL MATERIALS
·
2025
·
IF 4.2
Liming Zhang,Zhuang Zhao,Siyu Chen,Wei Chen,Xuying Zhong,Yuehua Peng,Yanling Yin,Jun Liu,Wei Dou,Dongsheng Tang,Weichang Zhou
CsPb 2 Br 5 has attracted a tremendous attention recently owing to its high stability and unusual optical properties. However, the transformation between CsPb 2 Br 5 and CsPbBr 3 has yet been fully understood and the origin of the bright green emission in CsPb 2 Br 5 is still under debate . In this work, we elucidate the mechanism of the abnormal green emission in CsPb 2 Br 5 and reveal the light/heating/humidity induced reversible transformation between CsPb 2 Br 5 and CsPbBr 3 . The detailed structure characterization indicates the successful synthesis of pure phase CsPb 2 Br 5 , which exhibits a non-luminous feature. Remarkably, after the treatment of ultraviolet laser irradiation or annealing, the pure phase CsPb 2 Br 5 can be transformed partially or completely into CsPbBr 3 , yielding an unexpected bright green emission. In addition, the transformed CsPbBr 3 can be converted back to CsPb 2 Br 5 under the humidity environment, demonstrating the reversible transformation and photoluminescence switch. Interestingly, CsPbBr 3 derived from transformed CsPb 2 Br 5 exhibits superior emission properties such as higher photoluminescence stability, compared with the one-spot directly synthesized CsPbBr 3 . Moreover, the light induced transformation facilitates the fabrication of CsPb 2 Br 5 /CsPbBr 3 nano-heterostructure diodes with a high rectification ratio. These results provide an important insight into the photophysics and transformation mechanism of all-inorganic Cs-Pb-Br perovskites for photonics/electronics device applications.
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Journal of Environmental Chemical Engineering
·
2025
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IF 7.2
Yunxiong Zeng,Yunpeng Yang,Yingchun Xia,Yihan Zhen,Xiaoling Peng,Bo Hong,Xinqing Wang
The pervasive presence of tetracycline (TC) in aquatic ecosystems poses a significant risk to human health. Solar-driven photocatalytic degradation of TC using Ag 3 PO 4 is an efficient solution; however, it suffers from photo-corrosion and Ag⁺ leakage. To address these challenges, we developed a novel encapsulation technique using alginate hydrogels polymer (AHGs) to protect Ag 3 PO 4 to prepare Ag 3 PO 4 -AHGs. The strategy effectively enables Ag₃PO₄-AHGs to decrease Ag⁺ leaching by ∼ 378 folds compared to pristine Ag 3 PO 4 . Thus, Ag 3 PO 4 -AHGs retain ca. 80 % of photocatalytic activity after four cycles. Furthermore, the first-order kinetic constant reaches 0.04 min⁻¹ under visible light irradiation, representing a 4.3-fold enhancement compared to AHGs. This exceptional performance is attributed to the efficient production of singlet oxygen (¹O₂) of Ag 3 PO 4 -AHGs. The high-performance liquid chromatography-mass spectrum, electron paramagnetic resonance and density functional theory elucidate the interactions between TC and ¹O₂, enabling efficient TC degradation. The durability of Ag 3 PO 4 -AHGs is primarily attributed to a unique microstructure formed during cycling, facilitated by a stable surface-reconstructed interphase that hinders Ag⁺ leakage. This approach effectively addresses concerns regarding the stability and environmental safety of Ag 3 PO 4 -based photocatalysts, offering a promising solution for sustainable water treatment.
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 5
·3795-3804
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IF 2.993
Song Lixin,Jing Wanru,Chen Jingjing,Zhang Shouren,Zhu Yuqing,Xiong Jie
The light response range, reusability, and durability of photocatalyst are the key issues for its practical application. To address these problems, the C-doped TiO 2 /carbon nanofibrous (CTCNF) film with incorporation of C-doped TiO 2 nanoparticles into carbon nanofibers was prepared by electrospinning and calcination (pre-oxidation and carbonization). All the obtained CTCNF films exhibited a promising light absorption in ultraviolet–visible region. With optimization of carbonization temperature, the CTCNF film carbonized at 800 °C (CTCNF-800) showed a strongest light absorption. Consequently, the CTCNF-800 possessed a highest photocatalytic degradation efficiency of 94.2% for degradation of rhodamine B. In addition, the CTCNF-800 possessed excellent flexibility and deserved mechanical strength, and hence, the CTCNF-800 could be easily segregated from solution and recycled. Satisfyingly, its degradation efficiency still exceeded 92% after using for six cycles, implying that the CTCNF had excellent reusability and well stability. Besides, the degradation efficiency was over 90% after the CTCNF-800 kept in air without illumination for 1 year, indicating its outstanding durability. The CTCNF film photocatalyst demonstrates tremendous potential in practical application for purification of wastewater.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Naizhang Xu,Bowei Cai,Qi Li,Yubing Liu,Jie Tang,Kaiqiang Wang,Bolian Xu,Yining Fan
The covalent triazine frameworks (CTFs) have recently become a new generation of organic semiconductor for photocatalytic hydrogen production from water splitting because of their great application potentials. However, the CTFs need to be combined with noble-metal-cocatalysts to achieve photocatalytic water splitting. Herein, we reported the noble-metal-free Ni 2 P/CTF composites as an efficient catalyst for photocatalytic hydrogen evolution . With increasing the Ni 2 P alloy loading on the surface of CTF, the photocatalytic activity increases obviously and then decreases gradually, and the highest photocatalytic H 2 evolution rate is achieved for 2.8%Ni 2 P/CTF, which is almost the same as that of 3.0%Pt/CTF photocatalyst. It has been revealed that the Ni 2 P alloy act as a cocatalyst for effectively suppressing the recombination of photogenerated electrons and holes, promoting the separation and migration of the charge carriers, thereby improving the efficiency of photocatalytic H 2 evolution. This work provides a promising strategy for preparation of cheap and stable photocatalytic system based on CTF for efficient photocatalytic hydrogen evolution under visible-light irradiation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Ganggang Guo,Qiong Xi,Tao Yin,Jianju Nie,Yayuan Zhang,Li Guan,Zhenyang Liu,Fenghe Wang,Xu Li
Broadband near-infrared (NIR) phosphors are key materials for the preparation of NIR phosphor-converted light-emitting diodes (pc-LEDs). The wider coverage of the NIR spectrum means that more substances can be detected by NIR light and more applications are possible. However, ultra-broadband NIR phosphors with the full-width at half maximum (FWHM) greater than 200 nm still face challenges in terms of thermal stability as well as internal quantum efficiency (IQE). In this work, a series of La 2 CaTa x Zr (1- x ) O 6 (LCTZO): Cr 3+ phosphors was successfully synthesized by the high-temperature solid-phase method. The non-equivalent substitution strategy of Ta 5+ in place of Zr 4+ effectively modulates the crystal field environment of Cr 3+ and reduces the number of defects, thus modulating the luminescence properties of the phosphor. Under the 471 nm excitation, the spectrum of La 2 CaTa 0.3 Zr 0.7 O 6 : 2 % Cr 3+ can cover the 700–1400 nm band (FWHM = 201 nm) with IQE of 42.6 %, and the emission intensity can be maintained at 373 K at 74 % of that at room temperature . The prepared NIR pc-LED with ultra-wide spectral coverage shows better potential applications in the fields of night vision and biological tissue penetration.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
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IF 5.401
Dan Zhong,Ziquan Cao,Bo Wu,Qing Zhang,Guojie Wang
Visible light/pH dual-responsive polymer dots (PDs) were facilely prepared from branched polyethyleneimine (PEI) functionalized with donor-acceptor Stenhouse adducts (DASAs). The synthesized polymer dots were characterized by X-ray photoelectron spectroscopy, 1 H NMR spectroscopy, Fourier transform infrared spectroscopy, transmission electron microscopy (TEM), dynamic light scattering (DLS), UV–vis absorption spectroscopy and fluorescence spectroscopy. The emission peak of the DASA-PEI polymer dots changed as the excitation wavelength varied from 360 nm to 520 nm. The strongest fluorescence emission was located around 522 nm upon 420 nm excitation. Moreover, the DASA-PEI polymer dots exhibited a typical photo-responsive behavior. After visible light irradiation, the triene of DASAs isomerized to the cyclopentenone form. Interestingly, the DASA-PEI polymer dots also responded to acid and alkali and showed a reversible transition between the triene and cyclopentenone isomers. It is demonstrated that the prepared DASA-PEI polymer dots could be applied as a turn-off chemosensor for the rapid and selective detection of Fe 3+ and Cu 2+ in aqueous solutions with detection limits of 10.1 nM and 1.3 nM, respectively.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2020
·
IF 4.495
Qiang-Qiang Zhu,Shuxing Li,Qiang Yuan,Hong Zhang,Le Wang
Yellow-emitting YAG:Ce transparent ceramic is recognized as an ideal color converter in high-power blue LEDs and LDs , but the absence of scattering centers in its microstructure leads to a low light extraction efficiency and poor light uniformity. Here, taking advantage of the scattering effect and the transparency of YAG:Ce ceramics, Ce-free YAG phase was used as a second component to form a composite with YAG:Ce phosphor. The sintered YAG:Ce-YAG ceramic possessed a high transparency of ∼63 % and a thermal conductivity of 8.9 Wm −1 K −1 . Due to its beneficial thermal properties and high external quantum efficiency of 70.2 %, the YAG:Ce-YAG ceramic could be excited under a high blue-laser flux density of up to 9.60 W/mm 2 and showed a luminous emittance of 1220 lm/mm 2 . Due to light scattering arising from the slightly different refractive indices of the two phases, the designed YAG:Ce-YAG ceramic showed better lighting effects than a single-phase transparent YAG:Ce ceramic.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Shuyue Guo,Yanan Jiang,Fei Wu,Ping Yu,Huibiao Liu,Yuliang Li,Lanqun Mao
As a new kind of two-dimensional carbon allotrope, graphdiyne (GDY) consists of sp- and sp2-hybridized carbon atoms and has recently been used for developing highly efficient photocatalytic systems because of its unique properties. In this study, we find that GDY can form a Pickering emulsion with silver phosphate (Ag3PO4) nanoparticles that exhibits largely enhanced photocatalytic activity in the visible-light region. In this system, Ag3PO4 acts as a photocatalytically active semiconductor with GDY as the hydrophobic nanostructure. Photocatalytic activity of the Ag3PO4/GDY-based Pickering emulsion toward the photodegradation of methylene blue (MB) and photooxidation of water is investigated under visible-light irradiation. Compared to previous Ag3PO4/CNT- or Ag3PO4/graphene-based Pickering emulsions, the Ag3PO4/GDY-based emulsion efficiently catalyzes MB degradation with a higher apparent rate constant k being ∼0.477 min–1, while for water oxidation its photocatalytic activity is also improved by 1.89 and 1.75 times, respectively. Such an enhancement in the photocatalytic activity is mainly ascribed to the capability of GDY in acting as an acceptor of the photogenerated electrons from Ag3PO4 nanoparticles and in facilitating the hole transportation as well as in reducing Ag+ to Ag0. This study demonstrates that GDY is a new candidate with a promising future in developing photocatalytic systems with high efficiency for real applications.
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