Nano Research
·
2016
·Vol. 9
·期 10
·2921-2930
·
IF 8.893
Zhang Xinqian,Wu Gang,Gu Zhuowei,Guo Bing,Liu Wenqing,Yang Shida,Ye Tao,Chen Chen,Tu Weiwei,Chen Hongzheng
We systematically investigated the development of film morphology and crystallinity of methyl-ammonium bismuth (III) iodide (MA 3 Bi 2 I 9 ) through onestep spin-coating on TiO 2 -deposited indium tin oxide (ITO)/glass. The precursor solution concentration and substrate structure have been demonstrated to be critically important in the active-layer evolution of the MA 3 Bi 2 I 9 -based solar cell. This work successfully improved the cell efficiency to 0.42% (average: 0.38%) with the mesoscopic architecture of ITO/compact-TiO 2 /mesoscopic-TiO 2 (meso-TiO 2 )/MA 3 Bi 2 I 9 /2,2′,7,7′-tetrakis(N,N-di-4-methoxyphenylamino)-9,9′spiro-bifluorene (spiro-MeOTAD)/MoO 3 /Ag under a precursor concentration of 0.45 M, which provided the probability of further improving the efficiency of the Bi 3+ -based lead-free organic–inorganic hybrid solar cells.
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ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Wenjing Yuan,Juchuan Li,Likun Wang,Ping Chen,Anjian Xie,Yuhua Shen
Developing an effective electrocatalyst for the oxygen reduction reaction is a momentous issue in fuel cells. In this paper, we successfully synthesized the N-doped TiO2 nanorods/graphene (N-TiO2/NG) nanocomposite, which comprise the N-doped TiO2 (N-TiO2) nanorods (40–60 nm diameter and 90–300 nm length) and self-assembled nitrogen-doped graphene (NG) networks. We found that the nanocomposite exhibits great oxygen reduction reaction (ORR) electrocatalytic performance and also shows long durability and methanol tolerance than that of the commercial 20% Pt/C catalyst. This new nanocomposite may also have potential applications in other fields, which are related to energy storage, gas sensors, photocatalysis, and so on.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Han Zheng,Zhonghang Xia,Huiming Ji,Yiwen Zhang
Mild UV in-situ assembly synthesizes GO@TiO 2 with Ti–O–C bonds. • Sensor exhibits a response of 25.93–50 ppm ethanol under UV at 25℃. • GO@TiO 2 response shows nonlinear growth with concentration. • Reaction-driven reconducted network boosts sensitivity, selectivity and stability. The development of the Internet of Things (IoT) has created an urgent need for room‑temperature gas sensors that combine high sensitivity, selectivity, and stability, which existing gas-sensing materials still struggle to deliver. Herein, the GO@TiO 2 composite is constructed via photocatalytic in situ assembly, wherein TiO 2 nanosheets are anchored onto graphene oxide (GO) with strong Ti–O–C covalent bonds formed at the interface. Under UV illumination at 25℃, the GO@TiO 2 sensor exhibits a response of 25.93 toward 50 ppm ethanol—a 14.4-fold enhancement over pristine TiO 2 (1.80)—along with excellent selectivity against various interfering gases. Moreover, the response exhibits a nonlinear surge with increasing gas concentration. The reaction-driven conductive network reconstruction mechanism is innovatively proposed: electrons generated from the ethanol oxidation reaction are injected into GO across the Ti–O–C interface, progressively restoring the conductive network and thereby switching the dominant conduction pathway from TiO 2 to the repaired GO. This work provides an innovative strategy for room-temperature gas sensing through the construction of the dynamically tunable conductive network to achieve signal amplification. Download: Download high-res image (221KB) Download: Download full-size image The GO@TiO 2 composite with covalent Ti–O–C bonds are designed for room-temperature ethanol sensing via photocatalytic in-situ assembly. Under UV illumination, the gas sensing reaction injects electrons into GO across the Ti–O–C bonds, driving reconstruction of the GO conductive network from a high‑resistance oxidized state to a conductive reduced state and leading to a sharp drop in resistance. This reaction‑driven network reconstruction triggers a superlinear response, endowing the sensor with high sensitivity (response of 25.93–50 ppm ethanol), selectivity, and stability.
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Acta Biomaterialia
·
2024
·
IF 9.4
Zi Qiao,Jie Ding,Mei Yang,Yuchen Wang,Ting Zhou,Yuan Tian,Mingze Zeng,Chengheng Wu,Dan Wei,Jing Sun,Hongsong Fan
Inspired by the strong light absorption of carbon nanotubes, we propose a fabrication approach involving one-dimensional TiO 2 /Bi 2 S 3 QDs nanotubes (TBNTs) with visible red-light excitable photoelectric properties. By integrating the construction of heterojunctions, quantum confinement effects, and morphological modifications, the photocurrent reached 9.22 µA/cm 2 which is 66 times greater than that of TiO 2 nanotubes (TNTs). Then, a red light-responsive photoelectroactive hydrogel dressing (TBCHA) was developed by embedding TBNTs into a collagen/hyaluronic acid-based biomimetic extracellular matrix hydrogel with good biocompatibility, aiming to promote wound healing and skin function restoration. This approach is primarily grounded in the recognized significance of electrical stimulation in modulating nerve function and immune responses. Severe burns are often accompanied by extensive damage to epithelial-neural networks, leading to a loss of excitatory function and difficulty in spontaneous healing, while conventional dressings inadequately address the critical need for nerve reinnervation. Furthermore, we highlight the remarkable ability of the TBCHA photoelectric hydrogel to promote the reinnervation of nerve endings, facilitate the repair of skin substructures, and modulate immune responses in a deep burn model. This hydrogel not only underpins wound closure and collagen synthesis but also advances vascular reformation, immune modulation, and neural restoration. This photoelectric-based therapy offers a robust solution for the comprehensive repair of deep burns and functional tissue regeneration. Statement of significance We explore the fabrication of 1D TiO 2 /Bi 2 S 3 nanotubes with visible red-light excitability and high photoelectric conversion properties. By integrating heterojunctions, quantum absorption effects, and morphological modifications, the photocurrent of TiO 2 /Bi 2 S 3 nanotubes could reach 9.22 µA/cm², which is 66 times greater than that of TiO 2 nanotubes under 625 nm illumination. The efficient red-light excitability solves the problem of poor biosafety and low tissue penetration caused by shortwave excitation. Furthermore, we highlight the remarkable ability of the TiO 2 /Bi 2 S 3 nanotubes integrated photoelectric hydrogel in promoting the reinnervation of nerve endings and modulating immune responses. This work proposes an emerging therapeutic strategy of remote, passive electrical stimulation, offering a robust boost for repairing deep burn wounds.
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DYES AND PIGMENTS
·
2026
·
IF 3.9
Linkai Zhao,Jing Zhao,Jiaying Hu,Zhao Mo,Ziyi Wang,Zhaoli Xue,Lei Feng,Long Zhao
Two zinc porphyrin-melamine complexes are designed for photocatalysis. • The two TiO 2 composites show similar morphology and light harvesting ability. • TPA-surpasses TPTZ-substituted samples for photocurrent and degradation. • All h + , .•OH and •O 2 − are the reactive oxygen species for photodegradation. • Cascade superiors competitive charge transfer for ROS generation. The generation efficiency of reactive oxygen species (ROS) typically governs the photodegradation performance. This work aims to compare two molecular design protocols in ROS photogeneration on TiO 2 nanoparticles. To this end, two zinc porphyrin-melamine conjugated complexes are designed, denominated as tri-TPTZ-ZnP-mel and tri-TPA-ZnP-mel, bearing triphenyltriazine (TPTZ) and triphenylamine (TPA) as the substituents, respectively. Our results demonstrate that the electron-withdrawing, planar tri-TPTZ-ZnP-mel induces intramolecular competitive electron transfer and accelerates charge recombination. In contrast, the electron-donating, three-dimensional structured tri-TPA-ZnP-mel suppresses molecular aggregation, promotes cascade charge transfer, and delivers significantly higher photocurrent, lower interfacial charge-transfer resistance, and superior photodegradation activity toward organic dyes. Mechanistic studies clarify the distinct roles of holes (h + ), hydroxyl radical (•OH) and superoxide radical (•O 2 − ) governed by substituent-driven charge transfer behaviours. Download: Download high-res image (309KB) Download: Download full-size image
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Zhiren Guo,Xinyue Liu,Jinlei Song,Hansheng Li,Dongxiang Zhang,Ting Liu,Xinyuan Li,Antonio Juan Dos Santos-García,Xiyan Xu,Jiatao Zhang
Conventional type-II heterojunctions broaden visible-light absorption and enhance charge separation but weaken redox potentials via charge migration, reducing thermodynamic driving force for surface catalysis. A novel direct Z -scheme heterojunction photocatalyst was constructed by decorating B 4 C with TiO 2 nanoparticles for efficient solar-driven degradation of 1,2-benzisothiazolin-3-one and other biocidal pollutants. The optimized TiO 2 /B 4 C photocatalyst achieved 98% BIT degradation within 4 h under simulated solar irradiation, with an apparent rate constant of 1.00 h −1 , approximately 38 and 6.2 times higher than those of pristine B 4 C and TiO 2 , respectively. The incorporation of B 4 C broadened visible-light absorption and promoted interfacial charge separation, while the formation of an internal electric field enabled a direct Z -scheme charge-transfer pathway that preserved strong redox potentials. As a result, photogenerated electrons accumulated on B 4 C and generated O 2 •− radicals, whereas holes retained on TiO 2 produced • OH radicals, jointly driving the oxidative degradation of pollutants. Electron Spin Resonance and radical scavenger analyses confirmed O 2 •− and • OH as the key reactive species. Density functional theory (DFT) calculations further elucidated the interfacial charge-transfer mechanism and the degradation pathway of BIT. This work demonstrates that the TiO 2 /B 4 C Z -scheme heterojunction provides an efficient strategy for solar-driven photocatalytic removal of biocidal pollutants, providing insights into rational design of high-performance photocatalysts for environmental remediation.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·124205
·
IF 7.5
Kaige Chen,Jie Li,Yongxiang Wang,Yong Dai,Yongming Luo,Xiaohua Cao,Xiaoping Xing
Photothermal conversion of CO 2 to methane offers a promising pathway for simultaneous carbon recycling and renewable energy storage. To date, Ni-based catalysts dominate CO 2 methanation. However, their low-temperature activity under photothermal conditions still requires improvement. MTiO 2 derived from Ti 3 C 2 MXene retains its two-dimensional (2D) layered structure and excellent photothermal conversion properties. Herein, we synthesized Ru-Ni@MTiO 2 catalysts through hydrothermal treatment of Ni-impregnated MTiO 2 with controlled Ru loading ( x = 1, 3 and 5 wt%). The optimal 3Ru-Ni@MTiO 2 catalyst achieved a CH 4 production rate of 86.25 mmol·g −1 ·h −1 at 300 °C, which is 1.3-fold higher than that of the Ru-free Ni@MTiO 2 counterpart. The superior catalytic performance stems from the synergistic electronic effect between Ni and Ru and their dual-site cooperation. Electron transfer from both Ru and MTiO 2 to Ni sites elevates the electron density of metallic Ni, which weakens the H-H bond and accelerates the dissociative adsorption of H 2 . Furthermore, Ru loading not only broadens the light absorption range and promotes photogenerated charge separation, but also increases the density of moderate basic sites, thus boosting CO 2 adsorption and activation. This work provides new insights into the design of bimetallic photothermal catalysts for CO 2 methanation.
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ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Boran Zhang,Qinyi Li,Yun Qin,Li Zhang,Ranran Zhou,Xinling Liu,Yiping Wu,Ying Wen,Haifeng Yang,Xiaoyu Guo
Surface-enhanced Raman scattering (SERS) based on semiconductor substrates offers advantages of low cost and high stability over noble metals, but its practical application is hindered by intrinsically weak signal enhancement. Herein, we report a simple molecular engineering strategy to dramatically boost the SERS performance of TiO2 microspheres through phytic acid (PA) modification. The PA molecules anchor onto TiO2 surfaces via Ti–O–P bonds, forming PA/TiO2 composites in a single-step postsynthesis process. The optimized PA/TiO2 substrate achieves an enhancement factor (EF) of 1.2 × 107─comparable to typical noble metal substrates─and enables detection of the probe molecule 4-mercaptobenzoic acid at concentrations as low as 1 × 10–9 mol/L. Comprehensive mechanistic investigation reveals a synergistic effect: (i) PA-induced coffee-ring aggregation for analyte enrichment, (ii) Mie resonance from the TiO2 microspheres (∼253 nm) for electromagnetic field enhancement, and (iii) charge transfer (CT) resonance at the PA/TiO2 interface for additional chemical contribution, supported by density functional theory calculations and finite-difference time-domain simulations. Leveraging this high-performance platform, we construct an SERS sensor for the endocrine disruptor bisphenol A (BPA), a common contaminant in thermal paper products. The sensor exhibits excellent analytical performance: a limit of detection (LOD) of 4.7 × 10–7 mol/L, a wide linear range from 5.0 × 10–6 to 1.0 × 10–3 mol/L (R2 = 0.9971), and satisfactory spike-recovery results (97.8–103.0%) in real thermal paper samples. This work demonstrates that molecular-level surface engineering offers a scalable and cost-effective route to high-performance semiconductor SERS substrates for environmental monitoring applications.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Rui Li,Sen Bai,Jianxin Liu,Qing Xi,Long Cao,Jinghao Fan,Yawen Wang,Houfen Li,Huibin Ge,Caimei Fan,Lulu Zhang,Shan Gao,Fangxia Xie,Jiancheng Wang
Photocatalytic water splitting is a promising approach for sustainable green hydrogen production, but its practical deployment is severely hindered by two critical limitations: mandatory H 2 /O 2 separation and the requirement for high-pressure hydrogen storage facilities. To address this long-standing bottleneck, a Ru-TiO 2 /Ti 2 C heterostructured photocatalyst is fabricated via a combined hydrothermal and ball-milling route. Operando spectroscopy and DFT calculations verify a cascade charge and hydrogen transfer pathway: photogenerated electrons migrate from TiO 2 to metallic Ru sites to drive water dissociation into surface H* intermediates, which then spillover onto the Ti 2 C substrate. Owing to the strong atomic hydrogen affinity of Ti 2 C, accumulated H* is immobilized in the Ti 2 C lattice via Ti-H covalent bonds, achieving in-situ atmospheric-pressure hydrogen storage. The optimized composite exhibits an in-situ hydrogen storage capacity of 2.1 wt% at ambient temperature and pressure, with a markedly reduced desorption temperature of 216°C and excellent cycling durability. This work establishes an integrated paradigm of photocatalytic water splitting and low-pressure hydrogen storage, offering a feasible strategy to resolve the inherent H 2 /O 2 separation dilemma and advance the practical application of solar-driven hydrogen production.
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NANO
·
2025
·
IF 1.1
Jinglin Wang,Yuntian Wei,Shikun Chen,Chan Zheng
Efficient interfacial carrier transfer and separation can effectively enhance photocatalytic activity. In this study, a high-performance Z-scheme Ti 3 C 2 @TiO 2 /g-C 3 N 4 (TCTCN) ternary photocatalyst possessing a hollow flower-like architecture was synthesized using a reliable and effective method. Ti 3 C 2 @TiO 2 heterojunctions were constructed because exfoliated Ti 3 C 2 was partially oxidized to TiO 2 during the formation of hollow g-C 3 N 4 flower-like microspheres. In the Z-scheme heterojunction, the highly conductive metallic Ti 3 C 2 layers functioned as solid-state electron mediators, promoting electron–hole separation and migration efficiency. Under visible-light irradiation, the as-synthesized TCTCN photocatalyst possessed outstanding photocatalytic tetracycline (TC) degradation efficiency that was 2.03-fold and 1.25-fold higher than those of individual layered and hollow flower-like g-C 3 N 4 , respectively. The excellent photocatalytic TC degradation efficiency is attributed to the unique hollow structure and synergy among the Ti 3 C 2 , TiO 2 and g-C 3 N 4 structures in the TCTCN composite, enabling the Z-scheme-mechanism-assisted rapid separation and slow recombination of photoinduced electron–hole pairs because of the increased photocatalytic activity. Moreover, the TCTCN ternary hybrid photocatalysts possessed good physical stability and reusability, and the TC degradation efficiency negligibly decreased after five cycles. This work is an important development to establish a sound foundation for designing g-C 3 N 4 -based hybrid photocatalysts possessing substantial charge carrier separation and transfer for efficiently degrading antibiotics.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Xin Xu,Ping Gong,Ruoying Wu,Kebai Lou,Sen Jiang,Yunfang Gao
Water dissociation (WD) at the junction of bipolar membranes (BPMs) is the core step that governs their energy efficiency in electrodialysis and related electrochemical processes, yet practical design for non-noble WD catalysts and compatible anion-exchange layers (AELs) remain limited. Here, we demonstrate that simultaneously enhancing the electronic conductivity of catalyst and ion-exchange capacity of the AEL effectively accelerates WD kinetics and interfacial ion transport in BPMs. An earth-abundant WD catalyst based on N-doped amorphous carbon/TiO 2 nanoparticles (N-ACNs/TiO 2 ) is designed, where a conductive N-doped carbon framework provides efficient electron transport and nitrogen/oxygen-containing functional groups, while anatase TiO 2 supplies hydroxyl-rich oxide surfaces for interfacial proton-transfer reactions. This junction is integrated with an in situ quaternized composite AEL that offers high water uptake and ion-exchange capacity. Assisted by our designed N-ACNs/TiO 2 catalyst and AEM, the resulting BPM exhibits a low WD voltage (∼1.18 V at 100 mA cm −2 ) and <5% voltage fluctuation at 1000 A m −2 over 6 h in Na 2 SO 4 bipolar membrane electrodialysis. These findings highlight that synergistic optimization of the junction catalyst and AEL architecture provides an effective and scalable interfacial engineering strategy for next-generation BPMs in acid–base electrosynthesis.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Mengli Han,Peng Gao,Jianhai Wang,Yuesong Shen
While noble metal single atoms (SAs)/semiconductor photocatalysts offer outstanding catalytic performance, challenges related to dosage and stability limit their broader application. In this study, we present a controlled photoreduction strategy that leverages synergistic photoreduction conditions, steric hindrance, and complexation to significantly enhance both activity and stability with an ultra-low Pt loading. The optimized Pt/TiO 2 catalyst (0.0063 wt% Pt) exhibits a 73-fold increase in photocatalytic activity, achieving a Pt mass activity of 6.24 mol/g/h. XPS analysis and DFT calculations reveal that Pt atoms are deposited on TiO 2 via strong interactions resembling an O-Pt-O bond, effectively preventing the migration and aggregation of highly dispersed Pt SAs, thereby significantly improving catalyst stability. Additionally, the ΔG H * for Pt 2+ SAs is nearly 0 (−0.002 eV), enabling rapid H adsorption and H 2 desorption, which imparts the catalyst with exceptional catalytic performance. This study paves the way for the development of catalysts with minimal precious metal content, enhanced efficiency, and extended stability.
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