INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Yufei Hu,Jiashou Lv,Danqin Li,Meisi Yu,Wenjing Zhou,Furui Lin,Weiqiang Zhou,Jie Li,Caiqin Wang,Jingkun Xu
To facilitate the commercialization of methanol fuel cells, the development of catalysts that exhibit both high activity and durability is of paramount importance. Nevertheless, the widespread application of current Pt-based catalysts is limited by their high cost and susceptibility to CO poisoning, among other drawbacks. Research has shown that introducing suitable support materials can enhance their anti-poisoning, making support development a key focus. In this research, we suggest a new strategy based on the template method to successfully synthesize oxygen vacancies neodymium-doped TiO 2 hollow spheres (OV-Nd-THS). The platinum nanoparticles (Pt NPs) were successfully loaded onto the OV-Nd-THS support to form the OV-Nd-THS/Pt nanocomposite. This innovative nanocomposite serves as a highly efficient catalyst, converting solar energy and chemical energy into electrical energy. The results indicated that the catalyst exhibited an electrocatalytic performance of 2686 mA mg −1 under alkaline conditions, which significantly increased to 5252 mA mg −1 under illumination. After 400 cycle tests, the mass activity maintained approximately 62 % of its highest value, demonstrating excellent durability. This remarkable performance is attributed to Nd doping, which introduces abundant oxygen vacancies, facilitating oxygen adsorption and consequently generating more active sites. The separation efficacy of photogenerated carriers is improved by the presence of surface oxygen vacancies, which in turn improves photoelectrocatalytic performance. Moreover, the hollow structure of titanium dioxide enhances light-harvesting capabilities, thereby promoting charge separation efficiency and facilitating the kinetics of the methanol oxidation reaction. This study presents a novel approach and establishes a significant experimental foundation for the development of high-performance catalysts for direct methanol fuel cells.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-12
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IF 15.7
Wang Ruonan,Zhang Mingjia,Liu Jingjing,Wu Xu,Zhang Shule,Zhong Qin,Yao Jianfeng
Scaling up methanol yields by artificial photosynthesis at a modest cost remains thermodynamically challenge. Designing concerted reaction sites to control intermediate evolution and stimulate proton-coupled electron transfer (PCET) is necessary. Here we show a nickel-titanium-based catalyst that achieves near-millimolar hourly methanol yields with 99.79% selectivity and a solar-to-chemical conversion efficiency of 2.23%. This catalyst is synthesized through one-step etching of NiTi-layered double hydroxide, which generates abundant unsaturated sites, along with the in-situ formation of amorphous TiO 2 . Revealed by in-situ characterizations, these defect-rich units effectively suppress the formation of undesirable carbonate while promoting the favorable *COOH intermediate. Furthermore, theoretical simulations confirm this *COOH boost facilitates the production of *CO and accelerates the PCET steps. This work significantly advances efficient methanol production by artificial photosynthesis and offers fundamental insights into controlling reaction pathways for renewable fuel synthesis.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Xueying Cheng,Meirun Lu,Zhengkai Wu,Renquan Guan,Qingkun Shang
The efficient photocatalytic eliminate of persistent pollutants is crucial for advancing photocatalytic technology in environment applications. Constructing efficient heterojunction photocatalysts represents a key strategy for prolonging the lifetime of photo generated charge carriers and enhancing photocatalytic performance. In this study, an In 2 S 3 /TiO 2 -2:1 defect-heterojunction photocatalyst was developed, which exhibited exceptional degradation ability for recalcitrant contaminants including trenbolone acetate (TBA), acetaminophen, and phenol. Remarkably, over 99 % of TBA was degraded in 30 min, with comprehensive environmental risk assessment confirming minimal ecological impact from degradation intermediates. Transient fluorescence spectroscopy and transient surface photovoltage spectroscopy were performed to evaluate the relaxation process of photogenerated carriers. The results showed that the carrier relaxation time of In 2 S 3 /TiO 2 -2:1 defect-heterojunction photocatalyst was significantly prolonged, which effectively promoted the photocatalytic activity. This study provides valuable references for the design and development of high-performance defect-heterojunction photocatalysts.
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SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Duo Zhao,Shiyu Jiang,Junao Zhang,Fengguo Zhu,Yue Wang,Ying Guo,Siyu Qian
In heterogeneous photocatalytic reactions, understanding the catalytic processes and its kinetics is crucial for catalyst design and performance evaluation. However, real-time monitoring the interface reaction such as pollutant degradation remains a challenge. In this study, the implantable optical fiber sensors with real-time catalytic monitoring capability were created by modifying the sensing surface with Au/TiO 2 heterojunction photocatalysts. As pollutants adsorb and degrade on the catalytic interface, surface refractive index changes occur. The evanescent field on the sensing surface covers the photocatalytic layer, enabling in situ and real-time monitoring of surface refractive index changes for catalytic reaction analysis. The flexible fiber-optic Surface Plasmon Resonance (SPR) sensors can be directly immersed in a pollutant solution Rhodamine 6 G (R6G) to monitor its degradation rate and kinetic processes. It reveals that the optimal size of Au nanoparticles (AuNPs) can facilitate efficient electron transfer at heterojunction catalysts. The time-resolved resonance wavelength shift further elucidates the degradation kinetics of photocatalysts with varying Au/TiO 2 composition. The fiber-optic sensor demonstrated comparable accuracy to conventional UV-Vis spectrophotometry in assessing TiO 2 photocatalytic degradation (84.13 % vs. 81.25 % efficiency, respectively), with a relative deviation less than 5 %. However, unlike the discrete data collected by traditional UV-Vis methods, the miniaturized and implantable fiber-optic SPR sensor can collect data every 0.25 s. It demonstrates real-time monitoring capability and enables more accurate evaluation of dynamic reaction processes. This in situ sensing strategy provides new insights into photocatalytic mechanisms and shows great potential for guiding catalyst design and optimization.
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OPTICAL MATERIALS
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2025
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IF 4.2
Yuanyuan Tian,Xinyang Zhang,Enze Wu,Shengli Liu,Bo Zhang
In this study, amorphous TiO 2 nanofilm has been prepared by a pulsed magnetron sputtering method. The uniform amorphous TiO 2 nanostructure shows the excellent electrochromic performance in visible and near-infrared bands, including the wide transmittance modulations of 63.4 % at 460 nm and 22.1 % at 2000 nm, the short switching time of 9.4 s/8.6 s for coloring/bleaching, and the large coloration efficiency of 62.4 cm 2 /C at 460 nm. Furthermore, the amorphous TiO 2 nanofilm has the feasible energy storage property. The TiO 2 film exhibits a large areal capacitance with good rate performance (9.3 mF/cm 2 ). It provides an intuitive method for monitoring energy storage through changes in TiO 2 electrode color. In addition, the oxygen concentration and sputtered time have significant effects on the microstructure, crystallization and electrochemical properties of TiO 2 films. These results have significant guiding significance for the development of amorphous TiO 2 films and related advanced dual functional devices with electrochromism and energy storage.
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APPLIED SURFACE SCIENCE
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2025
·
IF 6.9
Yizhi Zeng,Xianghong Ren
Unsymmetrical dimethylhydrazine is a high-energy liquid rocket fuel widely utilized in the aerospace field. Its highly toxic nature poses a significant threat to the ecosystem and human health, necessitating the urgent development of efficient and environmentally friendly treatment technologies. In this study, a (001) crystal facet-dominated 001-TiO 2 /CeO 2 S-scheme heterojunction was constructed via a solvent hydrothermal-photoassisted method. Under simulated solar light irradiation, the catalyst demonstrated a degradation efficiency of 98.4 % for high-concentration Unsymmetrical dimethylhydrazine wastewater (100 mg/L) within 140 min, while effectively decomposing highly toxic intermediates with a mineralization rate reaching 84.5 %. This is attributed to the synergistic interaction between the crystal facet effect and the S-scheme heterojunction, which significantly enhances the spatial separation and transfer of photogenerated carriers. The intermediate products were identified using solid-phase microextraction coupled with gas chromatography-mass spectrometry (SPME-GC–MS), revealing the possible degradation pathways of Unsymmetrical dimethylhydrazine and elucidating the reaction mechanism. This study offers a viable approach for the efficient degradation of Unsymmetrical dimethylhydrazine wastewater, offering significant reference value for advancing wastewater treatment in the aerospace industry.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2024
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IF 4.7
Liu Peng,Bi Yuanyuan,Gu Yaxin,Li Xiangyu,Mao Junpeng,Shan Xiantong,Cao Ji
In this study, a novel hydrogel nanofiltration (NF) membrane is developed through the coating-crosslinking method by synergistically utilizing multi-walled carbon nanotubes (MWCNTs) and titanium dioxide (TiO 2 ) into the hydrogel coatings of sodium alginate (SA) and polyvinyl alcohol (PVA) on a porous polyvinylidene fluoride (PVDF) matrix membrane. The experimental findings demonstrate that the P-MT@SA-PVA-PVDF hydrogel NF membrane displays outstanding separation performance, hydrophilicity, and antifouling properties. When the ratio of MWCNTs to PVP is kept at 1:4, the pure water flux of the prepared hydrogel NF membrane reaches 226.2 L/(m 2 ˑh). The rejection rates for Coomassie brilliant blue, Congo red, and Methylene blue are 96.3%, 95.8%, and 92.1%, respectively. Moreover, the total fouling rate of the membrane is merely 28.7%, and the flux recovery rate can attain 93.1%. The remarkable hydrophilicity and highly efficient rejection rates for dyes indicate broad application prospects of MWCNTs-modified hydrogel NF membranes in the field of printing and dyeing wastewater treatment.
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LAB ON A CHIP
·
2024
·
IF 6.1
Ziran Ye,Ping Lu,Yiben Chen,Zhixian Xu,Haixia Huang,Mingjia Zhi,Zi Ang Chen,Bo Yan
We present an efficient approach for the consecutive synthesis of Au–TiO2 nanocomposites with controlled morphologies in a microfluidic chip. The seed-mediated growth method was employed to synthesize Au nanorods as the core, and TiO2 layers of varying thicknesses were deposited on the surface or tip of the Au nanorods. Au–TiO2 nanocomposites with core–shell, dumbbell, and dandelion-like structures can be precisely synthesized in a one-step manner within the microfluidic chip by finely tuning the flow rate of NaHCO3 and the amount of hexadecyl trimethyl ammonium bromide. Furthermore, we have investigated the photocatalytic activity of the synthesized nanocomposites, and it was found that Au NR–TiO2 core–shell nanostructure with a thin TiO2 shell exhibits superior catalytic performance. This work provides an effective and controlled method for the microscale preparation and photocatalytic application of various Au–TiO2 nanocomposite structures.
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Materials
·
2025
·Vol. 18
·期 17
·4148
·
IF 3.2
Xiang Liu,Fujiang Huang,Xiang Shi,Hangmin Xu,Jian Xu,Xingwang Zhu
Alongside the gradual progress of industrialization and the continuous development of human society, the problems of environmental pollution and energy crisis have become increasingly prominent. Semiconductor photocatalysis is a promising solution to these challenges. The photocatalytic reduction of CO2by TiO2to produce carbon monoxide and methane is a process which has been identified as a means of developing clean energy. In this paper, two-dimensional TiO2(2D-TiO2) was synthesized via a one-step solvothermal method, and one-dimensional TiO2(1D-TiO2) was obtained through a hydrothermal process. Their photocatalytic CO2reduction performances were systematically investigated. The results show that 2D-TiO2exhibits superior catalytic activity compared to 1D-TiO2, which can be attributed to its lamellar structure, larger specific surface area, and improved hydrophilicity, providing more active sites and faster reaction kinetics. To further reveal the reaction mechanism, density functional theory (DFT) calculations were carried out using VASP with the GGA–PBE functional, PAW potentials, and a plane-wave cutoff energy of 520 eV. A 3 × 3 × 1 Monkhorst–Pack grid was used for Brillouin zone integration, and all possible adsorption configurations of CO2*, COOH*, and CO* intermediates on the 2D-TiO2surface were evaluated. The results confirm that 2D-TiO2stabilizes key intermediates more effectively, thereby lowering the energy barrier and facilitating CO2reduction. These findings demonstrate that structural modulation of TiO2significantly influences its photocatalytic performance and highlight the great potential of 2D-TiO2for efficient CO2conversion and clean energy applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Ping Li,Huanhuan Wu,Chengming Zhang,Quangui Liang,Huihui Ding,Haibao Zhu,Jun Ma,Xiang Li,Shuangshuang Huai,Congliang Cheng,Xiufang Wang
The lack of active sites and the low availability of photoelectrons severely limit the photocatalytic reduction of nitrogen to ammonia in semiconductor materials. Here, we successfully designed a BiOBr/O v -TiO 2 -Cu heterojunction catalyst toward N 2 fixation into NH 3 . The optimized BiOBr/O v -TiO 2 -Cu heterojunction has a promising photocatalytic performance and stability with the highest NH 3 yield of 259.82 μmol·g −1 ·h −1 . The combination of detailed theoretical simulation calculations and comprehensive characterizations indicates the BiOBr/O v -TiO 2 -Cu heterojunction with oxygen vacancy (O v ) stabilized Cu nanoparticles (NPs) as active sites can effectively adsorb and activate N 2 molecules. The close contact between BiOBr and Ov-TiO 2 elevates the quick transmission of photogenerated electrons at the interface and the enrichment on Cu NPs. This work not only provides an efficient photocatalyst for the N 2 reduction, but also supplies theoretical support for identifying the active sites and charge transfer kinetics of the nitrogen reduction reaction.
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Polymers
·
2024
·Vol. 16
·期 2
·186
·
IF 4.7
Wenbin Wang,Wei Qiang,Chuntao Chen,Dongping Sun
The utilization of titanium dioxide (TiO2) as a photocatalyst for the treatment of wastewater has attracted significant attention in the environmental field. Herein, we prepared an NH2-MIL-125-derived N-doped TiO2@C Visible Light Catalyst through an in situ calcination method. The nitrogen element in the organic connector was released through calcination, simultaneously doping into the sample, thereby enhancing its spectral response to cover the visible region. The as-prepared N-doped TiO2@C catalyst exhibited a preserved cage structure even after calcination, thereby alleviating the optical shielding effect and further augmenting its photocatalytic performance by increasing the reaction sites between the catalyst and pollutants. The calcination time of the N-doped TiO2@C-450 °C catalyst was optimized to achieve a balance between the TiO2content and nitrogen doping level, ensuring efficient degradation rates for basic fuchsin (99.7%), Rhodamine B (89.9%) and tetracycline hydrochloride (93%) within 90 min. Thus, this study presents a feasible strategy for the efficient degradation of pollutants under visible light.Keywords:titanium dioxide;NH2-MIL-125;N-doped TiO2@C;visible light photocatalysis;wastewater pollutants
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Wenjie Zhu,Qiuhong Liu,Fabian Long,Penggang Li,Xiaoya Gao,Yongming Luo
The present study employed a straightforward organic-inorganic approach to synthesize spherical mesoporous polydopamine (PDA)/titanium oxide (TiO 2 ) composite material (herein represented by the generic formula of PT-x, where x is the mass of dopamine hydrochloride added) through self-assembly. The morphology, structure and optical properties of PT-x were characterized using various analytical techniques. Moreover, PDA was found to serve multiple functions, including as an adhesive, a light absorber, and an electron (e − ) transport medium. The photocatalytic performance of the synthesized material for removing Cr(VI) was evaluated under simulated sunlight. The results showed that PT-0.5 removed 99.78 % of Cr(VI) within 2.5 h, of which 57.8 % was reduced to Cr(III). After five cycles, PT-0.5 retained a Cr(VI) removal efficiency of approximately 81.76 %. It was revealed that a high concentration of semiquinone and quinone functional groups in PDA facilitated the transfer of photoinduced e − and provided adsorption sites for Cr(VI). In addition, carbon (C) atoms in PDA, belonging to sp 2 hybridized orbitals with strong conductivity, which enabled the photogeneration of e − by the semiconductor material (TiO 2 ) to be transferred to the surface of the material faster, promoted the contact between Cr(VI) and its reduction to Cr(III). The combination of these properties reduced the recombination of photoinduced e − -hole (h + ) pairs in TiO 2 , thereby enhancing the efficiency of the removal of Cr(VI).
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