Materials Today Physics
·
2026
·
IF 9.7
Quancai Yue,Lijuan Ye,Lai Yuan,Guoping Qin,Di Pang,Yan Tang,Honglin Li,Hong Zhang,Wanjun Li
Self-powered bipolar photodetectors (PDs) have garnered significant attention for their potential in optoelectronic logic gates (OELGs) and secure optical communication systems, owing to their extremely low power consumption and cost-effectiveness. However, conventional unipolar PDs are constrained by functional rigidity and their reliance on passive decoding circuits. In this study, a self-powered bipolar photoelectrochemical detector (PEC-PD) is presented with a wavelength-dependent photoresponse in electrolytes, based on an amorphous gallium oxide/chromium oxide (a-Ga 2 O 3 /Cr 2 O 3 ) p–n heterojunction. This distinctive behavior arises from variations in the competitive dynamics between interfacial redox reactions and photogenerated carrier transport at the semiconductor/electrolyte interface under short-wave ultraviolet (UV-C) and long-wave ultraviolet (UV-A) irradiation. The device exhibits a positive photocurrent response time of 82.1/91.2 ms under 254 nm illumination and a negative photocurrent response time of 9.1/13.6 ms under 380 nm without an external power supply. Utilizing this tunable photoresponse, five fundamental Boolean logic operations—“OR”, “AND”, “NOR”, “NOT”, and “NAND”—are demonstrated by tailoring the illumination at specific wavelengths. Furthermore, the distinct bipolar photocurrent behaviors enable encrypted optical communication within a single photoelectrode architecture. This study advances the understanding of carrier dynamics manipulation and provides a solid foundation for the development of multi-functional OELGs and secure optical communication systems.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Leibo Deng,Tianyi Li,Yahui Zhou,Wenjing Zhang
The harmless treatment of Cr-containing solid waste remains a critical environmental challenge. Herein, Cr 2 O 3 -doped CaO–MgO–Al 2 O 3 –SiO 2 glass-ceramics with varying Na 2 O contents were prepared via a melting method. The study focuses on how Na 2 O regulates the glass network, crystallization behavior, and Cr immobilization efficiency. With increasing Na 2 O content, the degree of depolymerization (DOD) of the parent glass increases from 1.76 to 1.99, while the crystallization activation energy decreases accordingly. The optimal formulation is achieved at 1 wt% Na 2 O combined with a two-stage heat treatment (nucleation at 720 °C for 2 h, followed by crystallization at 850 °C for 2 h). Under these conditions, the glass-ceramic exhibits the lowest Cr leaching concentration of 0.031 mg/L, far below the regulatory limit of 5 mg/L. The dominant crystalline phases are diopside and a spinel solid solution, where Cr 3+ is stably incorporated into the spinel. These findings demonstrate that controlled Na 2 O addition provides an effective compositional lever for optimizing both crystallization kinetics and heavy metal immobilization, offering a sustainable pathway for valorizing Cr-containing wastes into high-performance glass-ceramics.
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Advanced Science
·
2026
·
IF 14.1
Yue Sun,Yan Wang,Fangying Shi,Wenhe Xie,Yiding Zhang,Heyuhan Zhang,Chunhui Deng,Limin Wu,Meihua Chen,Yonghui Deng
Matrix materials with high desorption and ionization efficiency are crucial for the sensitive and accurate metabolite profiling in matrix‐assisted laser desorption ionization mass spectrometry (MALDI‐MS). Herein, we develop an efficient detection platform based on Au nanoparticles decorated mesoporous Cr 2 O 3 (Au@mCr 2 O 3 ) particles with a single primitive continuous structure (i.e., Schwarz P surface) as the matrix. Owing to the low‐tortuosity mesoporous pathways and customized chemical composition, the Au@mCr 2 O 3 exhibits high‐efficiency light absorption and electron transfer, showing great potential for sensitive, reproducible, and selective metabolite detection. Therefore, it is considered as a high‐performance and reliable matrix material for metabolic biomarkers screening. As a proof of concept, the Au@mCr 2 O 3 ‐based detection platform decodes the saliva metabolic fingerprints. With the assistance of machine learning, the platform achieves high diagnostic performance for periodontitis, with the areas under the curve of 0.875–0.934. Furthermore, a simplified biomarker panel is established, which provides a deeper mechanism understanding of the metabolic alternation of periodontitis and offers new insights into its diagnosis and pathogenesis. A non‐invasive periodontitis diagnosis platform was developed using Au nanoparticles‐decorated mesoporous Cr 2 O 3 (Au@mCr 2 O 3 ) particles with Schwarz P surface as matrix for saliva metabolic fingerprinting (SMFs) analysis via MALDI‐MS. With the assistance of machine learning of SMFs, this platform enables efficient diagnosis and the screening of potential biomarkers, thus establishing a simplified diagnostic model and elucidating the possible mechanism about periodontitis pathogenesis.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Bin Li,Hongyu Ren,Shengda Guo,Jianbo Zhang,Zhihui Zhou,Bin Zeng,Xiangfei Guo
Tungsten powder is an essential raw material for producing tungsten carbide powders and tungsten-based alloys. However, the fabrication of high-performance spherical tungsten powders remains costly, and achieving a uniform distribution of doped elements poses significant challenges. In this study, a molecularly homogeneous W-Cr precursor solution was prepared using soluble salts, namely ammonium metatungstate ((NH 4 ) 6 [H 2 W 12 O 40 ]·xH 2 O)) and ammonium chromate ((NH 4 ) 2 CrO 4 ). Near-spherical W-Cr 2 O 3 composite powders with various Cr doping contents were synthesized through spray drying, calcination, and low-temperature hydrogen reduction. Subsequently, WC-10Co-xCr cemented carbides were fabricated via spark plasma sintering (SPS) following carburization. The effects of reduction temperature and Cr content on the morphology and phase composition of the W-Cr 2 O 3 composite powders were systematically examined. In addition, the influence of Cr doping on the mechanical properties of the cemented carbides was preliminarily evaluated. The results reveal that, at a reduction temperature of 900 °C and a Cr doping level of 0.5 wt%, the W-Cr 2 O 3 composite powders exhibit a uniform near-spherical morphology with fine and consistent particle sizes. The corresponding cemented carbide demonstrates superior overall performance. Furthermore, the Cr element is uniformly dispersed throughout the WO 3 precursor, W-Cr 2 O 3 composite powders, and the final alloy matrix.
研究领域:
材料科学
·
粉末冶金
·
无机化学
·
金属陶瓷
·
功能材料
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DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Sijie Liu,Renda Wang,Ping Yu,Kun Liang,Li Wang,Mengyu Gao,Yang Si,Chuang Zhu,Fangfang Ge,Bingsheng Li
In this study, molybdenum (Mo) coatings were deposited on 304 stainless steel (304SS) plates using magnetron sputtering. Subsequently, the samples were annealed at 800 °C under vacuum for varying durations to enhance adhesion strength and thermal stability. Immersion tests were conducted at 700 °C for up to 800 h. After 200 h of immersion, the weight loss of the annealed Mo-coated 304SS was significantly reduced from approximately 11 mg/cm 2 to about 0.44 mg/cm 2 . The Mo-enriched layer effectively suppressed the outward diffusion of alloy elements and facilitated the formation of Cr 2 O 3 by trapping Cr in the interdiffusion layer. Additionally, the Mo 3 Fe 3 O phase formed on the coating surface via diffusion reaction exhibited certain corrosion-resistant properties. Obvious interfaces emerged within the interdiffusion layer, and their formation mechanisms were analyzed. After four thermal cycles (with a 200-h interval), partial delamination of the Mo-enriched layer in the annealed Mo-coated 304SS was observed. This may have resulted from the substantial growth stress of Cr 2 O 3 and the significant mismatch in thermal expansion coefficient between Mo coating and 304SS.
研究领域:
材料科学
·
腐蚀工程
·
表面工程
·
可再生能源
·
冶金学
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Ye He,Xiaoyang Wang,Yue Shen,Songju Luo,Zhaoqin Xu,Xiaojiang Mu,Lei Miao
As ammonia (NH 3 ) emerges as a pivotal renewable hydrogen carrier, the development of cost-effective and high-performance electrocatalysts for the ammonia oxidation reaction (AOR) is imperative for sustainable hydrogen production. However, non-noble-metal catalysts are frequently bottlenecked by sluggish kinetics, restricted active-site exposure, and severe intermediate poisoning. Herein, a hierarchical Cr 2 O 3 @CuO heterostructure was synthesized on nickel foam via a two-step hydrothermal method. The optimized nanocatalyst delivers a remarkable AOR activity, achieving 10 mA cm −2 at a low potential of 1.32 V vs. RHE, alongside exceptional durability for 36 h at a high current density of 150 mA cm −2 . Experimental and density functional theory (DFT) studies reveal that Cr incorporation enriches oxygen vacancies and downshifts the d-band center from −1.12 eV to −1.79 eV. Notably, the dynamic evolution of high-valent Cr 6+ species during AOR effectively attenuates intermediate adsorption, lowering the maximum dehydrogenation free-energy barrier from 2.06 to 0.96 eV. This study underscores the significance of dynamic valence regulation in enhancing AOR kinetics and provides a robust paradigm for the rational design of transition-metal-based catalysts for the ammonia-to-hydrogen economy.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Mithun Nath,Shengqiang Song,Ning Liao,Tengteng Xu,Hang Liu,Himansu Sekhar Tripathi,Yawei Li
Obtaining a stable Cr 3+ phase at higher temperatures in the presence of hydraulic calcium aluminates (the phases found in calcium aluminate cement, CAC) in the Al 2 O 3 –CaO–Cr 2 O 3 system remains a significant challenge in many application areas, as the formation of toxic, carcinogenic, and water-soluble Cr 6+ compounds often occur. To address the issue, recently, we synthesized a high-temperature stable Cr 3+ ternary compound (CaAl 2 Cr 2 O 7 ) with space group P3 (143). In the present work, we investigated the formation-stability of CaAl 2 Cr 2 O 7 with in-situ calcium aluminate phases at 1500 °C under the CO 2 atmosphere in the Al 2 O 3 –CaO–Cr 2 O 3 system through solid-oxide reactions route varying Cr 2 O 3 content (at constant Al 2 O 3 :CaO ratio). It co-existed with hydraulic calcium aluminates and other phases over the full investigated composition range of 2.76–68.3 mol% Cr 2 O 3 (5–80 wt%). Apart from CAC phases (CaAl 2 O 4 , CaAl 4 O 7 ), major Cr 3+ -phases are CaAl 2 Cr 2 O 7 and (Al,Cr) 2 O 3 while (α,β)-CaCr 2 O 4 and Ca(Al,Cr) 12 O 19 formed as minor phases. At a constant Al 2 O 3 :CaO ratio of 5.6:4.4 mol% (7:3 wt%), the formation of the CaAl 2 Cr 2 O 7 phase increases with Cr 2 O 3 content (up to the investigated composition of 26.43 mol%) and then decreases gradually. The solid solubility of Al and Cr in the CaAl 2 Cr 2 O 7 phase limited over a narrow range, and presumably dependent more on heat treatment condition rather than composition as reflected from the lattice parameter calculations. Though XRD revealed the presence of only Cr 3+ -phases in the partial CO 2 atmosphere, however, traces of Cr 6+ could be detected using XPS and leaching tests. However, leachable Cr 6+ content (0.095–1.252 mg/L) were much below the United States Environmental Protection Agency (US-EPA) permissible limit of 5 mg/L. The formation mechanism of the CaAl 2 Cr 2 O 7 and other phases with plausible reactions were also discussed.
研究领域:
材料科学
·
环境科学
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Mithun Nath,Shengqiang Song,Hang Liu,Yawei Li
Despite huge potential, Al 2 O 3 –CaO–Cr 2 O 3 system has been one of the least investigated one due to the generation of carcinogenic and toxic Cr(VI) compounds. Herein, we investigated the system under air atmosphere varying Cr 2 O 3 while keeping Al 2 O 3 :CaO ratio constant in order to identify the Cr(VI) dominant region, eventually to avoid it. The Ca 4 Al 6 Cr VI O 16 phase predominantly formed in the air atmosphere with Cr 2 O 3 content up to ∼12 mol%. However, an unprecedented Cr(III) phase appeared under air at higher Cr 2 O 3 content (26.43 mol%). We then synthesized the new polycrystalline ternary Cr(III) compound (CaAl 2 Cr 2 O 7 ) at 1500 °C under air atmosphere for the first time. A trigonal symmetry of hexagonal crystal family with space group P3 (143), lattice parameters a = b = 7.7909 Å and c = 7.6506 Å were determined from the X-ray powder diffraction pattern study. Electron microscope studies revealed uniform hexagonal microcrystals with similar lattice parameters. Most significantly, the binding energies of 586.1 and 576.2 eV for Cr2p 1/2 and Cr2p 3/2 respectively implied the +3 oxidation state of Cr in this compound.
研究领域:
材料科学
·
化学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Xuan Zhu,Yan Liu,Menglin Wang,Li Zhang,Qiaoli Li,Entao Zhang,Hongfen Mo,Yuan Gao,Chenyu Xu,Yanwei Zhang
The synergistic coupling of light and heat in solar energy has attracted increasing research attention. In this work, both codoping and coloading were applied to SrTiO 3 -based catalysts to improve their solar photo and thermal conversion, respectively, and maximum productivities of 51.55 and 25.59 mmol·g −1 ·h −1 were achieved for H 2 and O 2 in photothermal synergistic water splitting. The yield of H 2 was nearly double that achieved via pure photocatalysis. In addition to many experiments and characterizations, DFT calculations were also performed to clarify the photothermal synergy. It was found that both the light absorbance and mobility of photoinduced carriers could be promoted by solar thermal effects in the material. Meanwhile, the energy barriers of the key steps were reduced with increasing temperature in the hydrogen production driven by solar photo effects. This work offers new ideas for designing catalysts for solar hydrogen production with photothermal synergistic strategies.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 37
·22780-22788
·
IF 3.361
Xiaoyi Sun,Qingjie Liu,Shuai Liu,Xintang Zhang,Shanshan Liu
A series of MOx–Cr2O3–La2O3/TiO2–N (M = Cu, Fe, Ce) catalysts with nitrogen doping were prepared via the impregnation method. Comparing the low-temperature NH3-SCR activity of the catalysts, CeCrLa/Ti–N (xCeO2–yCr2O3–zLa2O3/TiO2–N) exhibited the best catalytic performance (NO conversion approaching 100% at 220–460 °C). The physico-chemical properties of the catalysts were characterized by XRD, BET, SEM, XPS, H2-TPR, NH3-TPD and in situ DRIFTS. From the XRD and SEM results, N doping affects the crystalline growth of anatase TiO2 and MOx (M = Cu, Fe, Ce, Cr, La) which were well dispersed over the support. Moreover, the doping of N promotes the increase of the Cr6+/Cr ratio and Ce3+/Ce ratio, and the surface chemical adsorption oxygen content, which suggested the improvement of the redox properties of the catalyst. And the surface acid content of the catalyst increased with the doping of N, which is related to CeCrLa/TiO2–N having the best catalytic activity at high temperature. Therefore, the CeCrLa/TiO2–N catalyst exhibited the best NH3-SCR performance and the redox performance of the catalysts is the main factor affecting their activity. Furthermore, in situ DRIFTS analysis indicates that Lewis-acid sites are the main adsorption sites for ammonia onto CeCrLa/TiO2–N and the catalyst mainly follows the L–H mechanism.
研究领域:
催化
·
环境科学
·
材料科学
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PubMed
高影响因子
Catalysts
·
2023
·Vol. 13
·期 7
·1080
·
IF 3.9
Shiyuan Lin,Ruosong He,Wenhang Wang,Yang Wang,Yongqiang Gu,Qiang Liu,Mingbo Wu
The abundant C1 source CO2can be utilized to produce value-added chemicals through hydrogenation technology. A bifunctional catalyst consisting of reducible metal oxide Cr2O3and acidic zeolite ZSM-5 was designed for the direct conversion of CO2+ H2into valuable aromatics, especially para-xylene (PX), via the methanol-mediated pathway. The twin structure of ZSM-5 (ZSM-5T), with sinusoidal channels that are predominantly exposed to the external surface, enhances the possibility of the transformation of methanol into PX due to the favorable diffusion dynamic of PX in the sinusoidal channels. Via the bifunctional catalyst Cr2O3&ZSM-5T, a PX selectivity of 28.7% and PX space-time yield (STY) of 2.5 gCH2h−1kgcat−1are achieved at a CO2conversion rate of 16.5%. Furthermore, we rationally modify the ZSM-5Tzeolite via Cu species doping and amorphous SiO2shell coating (Cu-ZSM-5T@SiO2). After combining with the Cr2O3catalytic component, the CO2conversion (18.4%) and PX selectivity (33.8%) are increased to some extent, which systematically increases the STY of PX to 3.0 gCH2h−1kgcat−1. The physicochemical property of the acidic zeolite and the corresponding structure-function relationship in enhancing the PX productivity are discovered. Our work provides a novel catalyst design idea to boost PX synthesis performance from CO2hydrogenation.Keywords:CO2hydrogenation;bifunctional catalysts;para-xylene;H-ZSM-5 zeolites
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
Journal of Energy Chemistry
·
2025
·
IF 14.9
Chaojie Cheng,Bicen Yao,Siyu Wu,Wankun Gou,Xiaoai Luo,Xiang Chen,Xianrong Zhang,Hongming Sun,Cheng-Peng Li,Baoguang Mao
Efficient alkaline hydrogen evolution reaction (HER) catalysts are critical for anion exchange membrane water electrolysis (AEMWE). However, the intrinsic scaling relationship between water dissociation and OH desorption fundamentally impedes designing catalysts requiring concurrent superior water dissociation and facile OH desorption. Here, we engineer a superhydrophilic Ru/Cr 2 O 3 heterostructured electrocatalyst through in situ confinement of Ru nanoparticles (5–10 nm) within a Cr 2 O 3 matrix. Acting as a Lewis acid, the Cr 2 O 3 component provides alternative sites for water dissociation, accelerating the Volmer step kinetics and downshifting the Ru d -band center via interfacial charge transfer, while simultaneously adsorbing OH − to form a surface-bound Lewis base that repels excess OH − from Ru sites, thereby suppressing hydroxyl over-adsorption. Concurrently, the superhydrophilic surface architecture promotes efficient hydrogen bubble release, thereby reducing mass transport resistance. As a result, the Ru/Cr 2 O 3 heterostructured electrocatalyst exhibits an ultralow overpotential of 36.7 mV at 10 mA cm −2 and a Tafel slope of 33.2 mV dec −1 . Integrated into an AEMWE device, the electrode delivers 500 mA cm −2 for 2000 h in 1.0 M KOH, underscoring its industrial viability (hydrogen production energy consumption per cubic meter (EW): 3.94 kW h m −3 ; electricity-to-hydrogen energy conversion efficiency (η ETH ): 89%@80 °C).
研究领域:
电催化
·
材料科学
·
能源化学
·
界面化学
·
氢能技术
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高影响因子
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