Materials Science and Engineering B-Advanced Functional Solid-State Materials
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2024
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IF 3.9
Nan Jiang,Boyu Du,Di Gao,Zengbin Chai,Chao Liu,Xing Zhu
Herein, we synthesize the ZnAl-LDHs/NH 2 -MIL-125 composite via in situ growth of Ti-based metal–organic framework (MOFs) using layered double hydroxide (LDHs) as a carrier. The composite exhibits excellent performance for As(V) removal, achieving an adsorption capacity of 1634.0 mg/g in wastewater with an As(V) concentration of 1500 mg/L at pH of 10. The porous flower-like structure of the composite inherits the benefits of both the spatial structure of MOFs and the arsenic-affinity of LDHs. This results in an abundant active surface containing –OH, –NH 2 , M–O–M, and –COO– species, collectively contributing to As(V) adsorption. The adsorption progress governing As(V) removal follows the Langmuir isotherm and pseudo-second-order (PSO) kinetic models, revealing a monolayer and chemisorption mechanism. This study showcases the feasibility of the in situ growth of a MOF on LDHs to synthesize high-capacity adsorbents, offering a potential solution for As(V) removal from wastewater.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
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IF 6.3
Sixing Zhang,Guangyao Zhao,Zhen Li,Jianfeng Hu,Zhehui Zhao,Jiakang Yao,Na Cheng,Zhengguo Zhang
Traditional phase change materials (PCMs) offer broad application potential but face challenges such as environmental unfriendliness, high rigidity and poor heat transfer performance, resulting in low utilization efficiency. In this study, using biomass loofah sponge (LS) as the main framework and natural rubber latex (NRL) as the flexible modifier, the biomass-based PCMs (L-N) were successfully synthesized after encapsulating lauric acid (LA). The addition of nano-TiO 2 further enhanced thermal conductivity, ultimately leading to the development of flexible composite PCMs, L-N-Ti. In-depth characterizations revealed that the introduction of NRL significantly improved the system's strength and toughness, with tensile strength peaking at 1.161 MPa at 19.2 % NRL content, while maximum elongation at break reached 38.65 % at 26.3 % NRL. The incorporation of 7.4 wt% TiO 2 significantly boosted thermal conductivity to 0.57 W/(m·K), a 185 % increase over the unmodified material. Simultaneously, the energy storage efficiency (E m ) of L-N-Ti consistently exceeded 89.89 %, with only a 9.34 % loss in latent heat of fusion after 100 thermal cycles, indicating robust thermal stability. The successful advancement of L-N-Ti not only addresses the mechanical constraints inherent but also offers a sustainable biomass-based solution for effective thermal management within the 20°C–60 °C range.
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Journal of Physical Chemistry C
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2024
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IF 3.3
Jiaojiao Yu,Yi Zuo,Gudan Li,Hong Yang,Xinwen Guo
To synthesize a high-performance titanium silicalite-1 (TS-1), this paper reports a simple and environmentally friendly approach to regulate the alkalinity in the synthesis of titanium silicalite-1 (TS-1) involving tetrapropylammonium hydroxide (TPAOH) and tetrapropylammonium bromide (TPABr). Essentially, the pH of the synthesis gel was controlled by n(TPAOH/TPA+), while keeping the total tetrapropylammonium cations (TPA+) constant. The study shows that at a relatively moderate alkalinity of pH = 10.7, TS-1 produced exhibits nanocrystalline microstructure favorable for diffusion, contains high contents of TiO4 and TiV, and delivers 94.3% of H2O2 conversion with a turnover frequency of 565.6 mol (mol h)−1 in propylene epoxidation. Through detailed analysis of crystallization processes of TS-1 at different alkalinities, this study unveils the effect of alkalinity on the rate of Si–Ti condensation, which dictates the formation of the framework structure and incorporation of Ti species into the framework. Essentially, only at moderate alkalinity of pH = 10.7, comparable Si–OH and Ti–OH condensation rates permit the highest amount of Ti being inserted in TS-1 as active (TiO4 + TiV) and limits the self-condensation of Ti species to form inactive anatase-TiO2.
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Journal of Environmental Sciences
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2024
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IF 5.9
Wei Hou,Qian Zheng,Hengyue Xu,Guangming Zhan,Long Zhao,Jie Dai,Jiaxian Wang,Xingyue Zou,Bing Zhou,Lufa Hu,Ruizhao Wang,Kaiyuan Wang,Yancai Yao,Lizhi Zhang
Atomic hydrogen (H*) plays a crucial role in electrochemical reduction technology towards various environmental and energy applications, but suffers from low utilization efficiency arisen from the undesirable H–H dimerization and the competitive adsorption between water molecule with reactants on the traditional adjacent catalytic sites. Herein, we anchored Pd single atoms on the naturally formed titanium oxide of titanium foam to construct Pd 1 -O-Ti dual-site electrocatalyst with spatially isolated water dissociation and H* utilization site, which synchronously inhibits the H–H dimerization and the competitive adsorption of water molecule and targeted reactants. Experiments and theoretical calculations revealed that the Ti–O sites could synergistically dissociate water to H*, which overflowed to nearby Pd single-atom sites for designed reduction reactions and utilization benefiting from the hydrogen spillover ability of titanium oxide substrate. These Pd 1 -O-Ti dual sites delivered almost 100 % bromate reduction efficiency with a rate constant of 1.57 h –1 , far superior to those of Pd n -O-Ti with adjacent Pd sites (0.52 h –1 ), Pd 1 -N-C with single sites (0.04 h –1 ) and commercial Pd/C (0.18 h –1 ), respectively. This study sheds light on the importance of integrating synergistic active sites for complicated electrochemical reactions, and provide new insights in improving H* utilization for environmental remediation.
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SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Zhaorui Zhang,Haiying Du,Huashuai Hu,Dongchen Tan,Jinkui Chu,Minghui Yang
Two-dimensional transition metal carbon nitrides (MXenes) are a prominent class of functional materials with significant potential for sensing applications. However, their conventional charge transfer mechanisms pose limitations for detecting nitrogen dioxide (NO 2 ). In this study, we successfully design-synthesized potassium titanate (KTO) nanoribbons by oxidizing and alkalizing monolayer Ti 3 C 2 T x MXene, targeting room-temperature NO 2 detection. The Ti 3 C 2 T x -derived KTO exhibited exceptional selectivity for NO 2 , achieving a remarkable response of 649.2 % for 50 ppm NO 2 , which is 550 times higher than that of the Ti 3 C 2 T x sensor (1.18 %). Additionally, the sensor demonstrated a detection limit as low as 5 ppb at room temperature, along with rapid response (1 s) and recovery times (2 s), and excellent linearity. Computational analysis showed that the abundant OH groups on the KTO surface contribute to strong selective adsorption (2.79 |eV|) and efficient electron transfer (0.91 |e|) for NO 2 . The unique proton conduction mechanism of KTO further reduced the activation energy for proton transport, enhancing NO 2 sensing performance. This study highlights the potential of Ti 3 C 2 T x -derived KTO nanomaterials for advanced room-temperature NO 2 detection and sensor technology development.
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POLYMER COMPOSITES
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2025
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IF 4.7
Lejian Chen,Xianghong Xiao,Haofang Yuan,Hongyu Chen,Yuxuan Zhou,Yinghua Ye,RuiQi Shen,Lizhi Wu
With the ongoing advancement of miniaturization and microfabrication, Micro-Electro-Mechanical Systems (MEMS) energetic devices are increasingly demanding higher output capabilities from energetic materials. This study investigates the incorporation of Titanium (Ti) into PVDF-based energetic films to improve their performance. We fabricated five Al/Ti/CuO/PVDF energetic composite films with varying Ti contents by direct ink writing (DIW). The results indicate that the Al/Ti/CuO/PVDF films demonstrate superior performance compared to Al/CuO/PVDF(AT-0). Notably, the 50 wt% Al/50 wt% Ti/CuO/PVDF (AT-50) film achieved optimal performance, exhibiting a 68% increase in combustion rate compared to the AT-0 film. Additionally, it showed a reduction in ignition delay time by 6 ms, an increase in flame temperature of 160.9 K, a 24% rise in maximum pressure, a pressurization rate enhancement of 117%, and an overall increase in heat release of 26.8%. This is attributed to the synergistic effect of the Al/Ti bimetallic fuels, where their close contact creates an alloying reaction that releases a large amount of heat and avoids the detrimental effects of Al sintering. This Al/Ti/CuO/PVDF energetic composite film, characterized by its exceptional synergistic mechanism and high energy output, holds significant promise for integration with MEMS devices, paving the way for innovative applications in micro-ignition, micro-propulsion, and micro-startup technologies. Highlights Ti was added to the PVDF-based energetic films to form the dual-fuel system. The Al/Ti dual-fuel has a synergistic effect to improve output performance. The 50wt%Al/50wt%Ti/CuO/PVDF film can achieve optimal output performance.
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MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2025
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IF 4.6
Yunlan Xu,Jiaxin Mou,Lin Dong,Qingmei Qiao,Dengjie Zhong
The performance of photocatalytic fuel cell (PFC) depends on photoanode, which is the key to generate photoexcited carriers and degrade organic wastes. In this study, ZnIn 2 S 4 nano-bandgap semiconductor and polypyrrole were used to modify TiO 2 to prepare polypyrrole/ZnIn 2 S 4 /TiO 2 /Ti photoanode to increase its photo-response range and the separation of photoexcited carriers. The PFC with polypyrrole/ZnIn 2 S 4 /TiO 2 /Ti photoanode and copper cathode was built to degrade RhB and generate electricity. The RhB removal rate, open-circuit voltage, short-circuit current density, and maximum power density of the photocatalytic fuel cell were 94.6 % (1 h), 0.47 V, 0.23 mA cm −2 and 21.11 μW cm −2 , respectively. The improvement of PFC performance is attributed to the good visible-light responsive properties of polypyrrole/ZnIn 2 S 4 .The presence of polypyrrole acts as both an electron donor and a hole acceptor, which provides an ideal pathway for the separation and transmission of photogenerated carriers. The synergistic effect of polypyrrole, ZnIn 2 S 4 and TiO 2 eventually increases the photocatalytic ability of the PFC. This research can offer reference for the study of TiO 2 -based efficient visible light responsive PFC.
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JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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2025
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IF 2
Xiang Hongliang,Chen Xiaoyu,Huang Ye,Wu Chaochao,Mou Gang,Zheng Kaikui
This study investigated the fabrication of a strengthened Ti-TiO 2 material with adding 0.5 wt.% TiO 2 nanoparticles via selective laser melting process in comparison with CP-Ti. Through the process parameters optimized by response surface methodology, the Ti-TiO 2 material fabricated by SLM showed remarkable tensile strength of 800.6 MPa and elongation of 14%, as compared to the fabricated CP-Ti with tensile strength of 594.0 MPa and elongation of 21%. The x-ray diffraction patterns of fabricated specimens showed the expansion of the hcp -Ti lattice along the c -axis due to dissolved oxygen atoms from the decomposition of TiO 2 nanoparticles. The microstructure analysis observed remains of incompletely decomposed TiO 2 and TiO phases in SLMed Ti-TiO 2 material, which was distinguished from former studies. Consequently, the decomposition behavior of added TiO 2 nanoparticles associated with the dissolved oxygen in the Ti-matrix during the SLM process was discussed. Based on the evaluation of both the solution effect of oxygen atoms and the reinforcing effect of undecomposed nanoparticles, the dissolved oxygen from decomposed TiO 2 was considered the primary factor in the intensified strength of SLMed Ti-TiO 2 material. These results could offer novel insights into the additive manufacturing of high-strength and biocompatible titanium alloy via the SLM process.
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ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Wenfeng Lang,Hao Li,Longzhou Zhang,Jie Feng,Yongheng Jia,Mengting Zhang,Shufang Zhao,Young Dok Kim,Zhongyi Liu,Zhikun Peng
The alkylation of benzene with cyclohexene provides a direct and atom-efficient route to cyclohexylbenzene (CHB), a key intermediate for advanced chemical manufacturing. The role of Lewis acid sites (LAS) in homogeneous alkylation is well established; however, their function and synergy with Brønsted acid sites (BAS) in solid acid catalysts remain elusive. Herein, we proposed a dual-acid-site engineering strategy to construct titanium-incorporated β zeolites (Hβ-at-x) via sequential dealumination and titanation. Structural and spectroscopic characterizations confirmed that Ti was anchored in silanol nests, generating electron-deficient Ti-LAS while tuning the Al-BAS to establish synergetic dual-acid-site. It was demonstrated that Ti-modified Al-BAS facilitated the protonation of cyclohexene, and benzene was adsorbed and enriched on Ti-LAS via π-complexation adjacent to BAS. The optimized Hβ-at-50 catalyst achieved complete cyclohexene conversion, even under the currently lowest benzene-to-cyclohexene volume ratio of 7:1. Furthermore, it demonstrated a significantly enhanced CHB formation rate of 18.6 mmolCHB·gcat–1·h–1, surpassing that of the parent Hβ catalyst (2.98 mmolCHB·gcat–1·h–1) and the Hβ-at catalyst (2.29 mmolCHB·gcat–1·h–1). The superior activity was corroborated by a reduced apparent activation energy (Ea = 35.1 kJ·mol–1) compared to the parent Hβ catalyst (Ea = 57.3 kJ·mol–1). The catalytic stability decreased during cycling due to the light olefin polymerization, and its activity could be fully restored via thermal treatment. This work provides mechanistic insight into dual-site catalysis and a design framework for high-performance zeolite catalysts for hydrocarbon upgrading.
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Advanced Materials Interfaces
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2025
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IF 4.4
Chengguang Lang,Lei Zhang,Cheng-Jie Yang,Hanwu Dong,Hao Zhong,Chung-Li Dong,Jun Chen,Aijun Du,Yi Jia,Liuzhang Ouyang,Xiangdong Yao
Solid-state hydrogen storage materials with optimal binding energy are essential for hydrogen storage and transportation applications and pose long-standing challenges. Current technologies, including molecular physisorption materials (e.g., metal–organic frameworks (MOFs), carbon nanotubes (CNTs), activated carbons (ACs)) and atomic chemisorption materials (e.g., MgH 2 , LiBH 4 , NH 4 BH 4 ), fall short of meeting practical application requirements. Therefore, designing and constructing new solid-state hydrogen storage materials at the atomic level is critically important. In this study, the use of defect engineering is explored to modulate hydrogen adsorption sites on TiO 2 surfaces. The results demonstrate that low-coordinated titanium (Ti) atoms on TiO 2 can serve as effective hydrogen adsorption sites, storing hydrogen through molecular chemisorption with significantly enhanced adsorption energy compared to Ti atoms in high coordination states. Moreover, the adsorbed hydrogen remains in molecular form, facilitating easy desorption at room temperature, unlike titanium hydride, which requires high temperatures for desorption. This approach provides a promising pathway for developing efficient hydrogen storage materials by leveraging the unique properties of low-coordinated Ti atoms on TiO 2 surfaces.
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DALTON TRANSACTIONS
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2025
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IF 3.3
Yanyang Li,Lu Lei,Sirui Shu,Jian Zou,Shanshan Hu,Jun Yang
Sb3+ doped inorganic perov-skites have attracted great attention for anti-counterfeiting and infor-mation encryption applica-tions due to their excellent optical properties. We have synthesized a novel perov-skite Cs2KLuCl6, which ex-hibits weak cyan emission originating from the self-trapped excitons (STEs) of the host. Its photolumines-cence quantum yield is enhanced from 2% to 68% by Sb3+ doping. The energy transfer channel from STEs to Ho3+ was constructed, and the luminescence color was modulated from cyan to white with the increase of Ho3+ doping concentra-tion. The Sb3+/Ho3+ co-doped sample has two-color luminescence performance due to the introduction of new emission centers. Up-conversion green emission was obtained by introduc-ing Yb3+/Er3+. Finally, the optical properties of the obtained samples were utilized to design an anti-counterfeit label and in-formation encryption strategy.
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VACUUM
·
2025
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IF 3.9
Zhuo Li,Huiling Du,Nan Kong,Na Cao,Kemeng Hu,Lan Yang,Xian Du
Carbon dioxide conversion represents a highly promising carbon reduction strategy, and photocatalytic conversion technology, characterized by greenness, non-toxicity, and sustainability, holds significant importance. However, enhancing CO 2 adsorption on photocatalysts and improving charge carrier separation efficiency remain substantial challenges. In this study, based on MIL-101, we designed a highly interconnected TiO 2 @MIL-101 bifunctional heterojunction by in-situ compositing TiO 2 on its surface through Ti-O-Cr bonding, aiming to achieve in-situ adsorption and conversion of carbon dioxide. This composite photocatalyst exhibits enhanced photocatalytic activity, with an average CO production rate of 35.39 μmol h −1 g −1 and a CH 4 production rate of 13.81 μmol h −1 g −1 . Compared to unmodified MIL-101 (Cr), these values are increased by 1.25-fold and 2.8-fold, respectively. Experimental results combined with DFT calculations demonstrate that the porous structure and high specific surface area of MIL-101 facilitate the diffusion of CO 2 on the photocatalyst surface and improve interfacial reaction kinetics. The synergistic effect between Ti-O-Cr bonds and the built-in electric field within the highly interconnected heterojunction accelerates the directional transfer of charge carriers at the heterointerfaces, effectively promoting the catalytic conversion of carbon dioxide.
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危险品化学品经营许可证（带存储）