JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 9
·092505
·
IF 3.9
Shuna Liu,Ben Yang,Anran Zuo,Yongming Tang
Ti/SnO2-Sb/PbO2 anodes were electrodeposited from methanesulfonate-based baths, and the effect of dopants such as PVP and Fe on the surface morphology, phase composition, electrocatalytic activity and stability was investigated. It is revealed that the inclusion of Fe effectively enhances the stability of PbO2 anode, while PVP can significantly improve its electrocatalytic activity. The Fe,PVP-codoped anode, Ti/SnO2-Sb/Fe-PVP-PbO2, exhibits the higher stability and electrocatalytic activity compared to the respective inclusion of Fe and PVP. The gradation efficiency of methyl orange (MO) on the Ti/SnO2-Sb/Fe-PVP-PbO2 anode is affected by the applied current density and the initial MO concentration. During degradation, the azo structure of MO is firstly cleaved, resulting in the rapid decolorization of solution. Demethylated MO and the anion of sulfanilic acid are detected as intermediates, and thus a plausible pathway of MO degradation is proposed.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Min Xie,Xiaoying Li,Yufan Chen,Xiangyue Liao,Qiaoji Zheng,Heng Zhang,Kwok-Ho Lam,Dunmin Lin
Sodium superionic conductor (NASICON)-type phosphates cathodes have attracted considerable attention due to their high operational voltage and robust three-dimensional (3D) framework; however, the poor intrinsic electronic conductivity and low energy density hinder their broader application. Herein, a novel NASICON-type Na 3 V 1.44 Fe 0.5 Mo 0.06 (PO 4 ) 3 cathode was designed through Fe/Mo dual-doping at the V sites of Na 3 V 2 (PO 4 ) 3 and synthesized via a conventional high-temperature solid-state method. The introduction of Fe 3+ activates the V 4+ /V 5+ redox couple at a high voltage plateau (∼ 4.0 V), while also generates additional Fe 2+ /Fe 3+ and V 4+ /V 5+ redox pairs. Meanwhile, the doing of Mo 6+ creates cation vacancies, effectively modulating the electronic structure of vanadium and promoting ionic transport kinetics. Benefiting from this dual-doping strategy, the Na 3 V 1.44 Fe 0.5 Mo 0.06 (PO 4 ) 3 cathode delivers a high capacity of 123.4 mAh g −1 at 0.2C and an impressive energy density of 406 Wh kg −1 within 2.2–4.2 V. Moreover, it exhibits outstanding cycling stability, presenting a capacity retention of 92 % after 2500 cycles at 30C. This work highlights a viable strategy for advancing high-performance NASICON-type cathodes through complex metal ion doping.
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MATERIALS & DESIGN
·
2024
·
IF 7.6
Nana Zhu,Lu Zhu,Baojing Zhang,Peizhong Feng,Shiheng Li,Philipp V. Kiryukhantsev-Korneev,Evgeny A. Levashov,Xuanru Ren,Xiaohong Wang
An innovative two-step approach of self-propagating high-temperature synthesis (SHS) and spark plasma sintering (SPS) was developed to rapidly fabricate MoSi 2 and Mo(Al,Si) 2 ceramics for high-temperature anti-oxidation applications. The SHS process predominantly promoted the synthesis of high-purity and high-yield MoSi 2 and Mo(Si,Al) 2 phases in the alloyed powders. Subsequently, dense and crack-free MoSi 2 and Mo(Al,Si) 2 ceramics were produced using SPS. 1500 °C oxidation tests of the ceramics (100 h) revealed the formation of a protective SiO 2 oxide layer on the surface of MoSi 2 ceramics, while an Al-Si-O composite glassy oxide layer formed on Mo(Si,Al) 2 ceramics, which exhibited better thermal stability and lower oxygen permeability compared to the single SiO 2 oxide layer. However, an excessive Al content (>0.05 at.%) compromised the oxidation resistance due to the emergence of a Si-depleted Mo 5 (Si,Al) 3 layer with inferior oxidation resistance, which was caused by the high-temperature diffusion of Si. Therefore, via this novel two-step SHS-SPS technique compact and crack-free Mo(Si,Al) 2 ceramics can be rapidly synthesized at high temperatures. When trace amount of Al was added (0.05 at.%), Mo(Si 0.95 Al 0.05 ) 2 showed optimum high-temperature oxidation resistance.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wanchen Zhu,Zhongyang Luo,Feiting Miao,Longyi Liu,Akira Nakayama
Biomass hydropyrolysis (HP) vapor upgrading (VU) is highly promising for producing sustainable aviation fuel, yet challenges remain. This study focused on PdMo/γ-Al 2 O 3 and Mo/γ-Al 2 O 3 catalyzed HP-VU of biomass in a pressurized continuous fixed-bed and the reaction mechanism. The results demonstrated that the introduction of Pd enhanced the hydrodeoxygenation activity through multiple effects, including the generation of surface acidic sites, the formation of oxygen vacancies, and the effect of hydrogen spillover. Beyond this, the effects of upgrading temperature and pressure on the catalytic performance of PdMo/γ-Al 2 O 3 were also investigated. Under optimal conditions of 400 °C and 1.0 MPa, the organic phase achieved a mass yield of 12.03 wt%, with the selectivity of C4+ aliphatic hydrocarbons and monocyclic aromatic hydrocarbons reaching 77.01 %, leading to an HHV of 42.41 MJ/kg and high mass balance (98.71 %). Density functional theory calculations further provided insights into the role of defect sites in facilitating C–O/C=O bond cleavage and the contribution of Pd sites to C C bond activation. By integrating theoretical calculations with model compound experiments, the study revealed the potential reaction pathways including hydrodeoxygenation, hydrogenation, and C C coupling. This study provides practical and theoretical insights into the bimetallic-catalyzed HP-VU process of biomass.
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DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 20
·6776-6784
·
IF 4.029
G. Q. Wang,X. H. Gong,Y. J. Chen,J. H. Huang,Y. F. Lin,Z. D. Luo,Y. D. Huang
Two novel red phosphors KBaEu(XO4)3 (X = Mo, W) have been synthesized by high-temperature solid-state reactions and the crystal structures were determined for the first time. Single-crystal X-ray diffraction data reveal that their space groups are C2/c. The crystalline structure is constituted of K/BaO8 distorted square antiprisms and distorted EuO8 polyhedra which form chains lying along the c-axis and two kinds of distorted XO4 tetrahedra. This high disorder of K/Ba which might lower the crystal field symmetry around Eu3+ results in the high purity of red emission around 615 nm originating from 5D0 → 7F2 transition under near-ultraviolet (NUV) excitation. With increasing temperature, the luminescence of KBaEu(XO4)3 (X = Mo, W) phosphors decreases almost linearly with subtle alteration for the CIE coordinate. As the temperature reaches 550 K, the red emission intensity decreases to 37.3% and 50.7% of that at 300 K for KBaEu(MoO4)3 and KBaEu(WO4)3, respectively. The analysis of the decay curves of the 5D0 → 7F2 emission at variable temperatures indicates the weak cross relaxation and non-radiative energy transfer between Eu3+ ions. These results demonstrate that the investigated phosphors are attractive for application in high power NUV excited white LEDs.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Bo Shen,Yuxin Hui,Qi Wang,Fei Wang,Derek Hao,Huayue Zhu,Liguo Shen,Hao Du
Photocatalytic three-electron oxygen reduction (3e - ORR) can convert dissolved O 2 into •OH via coupled 2e - /1e - steps, bypassing external H 2 O 2 dosing and the kinetic bottleneck of conventional photo-self-Fenton (PSF) systems. Here, Fe-substituted phosphomolybdate clusters (FePMo) are anchored on a biomass-derived hierarchical tubular carbon (HTCC) to form an HTCC/FePMo heterojunction (HFe) that drives a visible-light self-Fenton process. For tetracycline (TC, 10 mg L −1 ), HFe achieves 99 % removal within 120 min at unadjusted pH 0 = 5.8 ( k obs = 0.026 min −1 ) and 3.6–7.7-fold higher mineralization than either component, while retaining high activity from pH 3–9 and in saline water, natural surface water, and secondary effluent. In a continuous-flow reactor, an HFe/PVDF membrane (0.64 mg cm −2 loading; 2 mL min −1 , HRT 1.23 min) sustains > 90 % TC removal for 120 h. Ecotoxicity is alleviated, with inhibition-zone diameters shrinking from ∼2.3 to ∼0.8 cm ( S. aureus ) and from ∼1.25 to ∼0.7 cm ( E. coli ), and wheat-leaf Fv/Fm recovering to ∼0.73, comparable to the water control. The energy demand is low (EE/O = 0.0031 kWh L −1 ; EE/M = 0.31 kWh g −1 ), supporting a scalable, sustainable route for advanced treatment of refractory wastewater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Minghong Dai,Yafang Chen,Peng Wang,Dianming Chu,Zhaoying Li,Wenjuan Bai,Yan He
Coalescence induced by the dynamic evolution of catalysts under catalytic environments has long been a challenge in the growth of carbon nanotubes (CNTs). Herein, this study reports a catalyst "hijacking" strategy, which leverages the time-dependent difference during the crystalline-to-amorphous transformation of catalysts to activate the catalytic activity of small-sized crystalline nanoparticles, preventing their coarsening via Ostwald ripening. Simultaneously, the retained nanoparticles exhibit higher density and optimized electronic structures, extending the catalytic lifetime. The successful synthesis of the catalyst relies on the efficient utilization of Mo in open cavities, where the isolated open cavities restrict excessive coalescence of the active components, and the doping of Mo atoms induces the transformation of the active components from amorphous to crystalline. In this structure, the semi-confined space, surface negative charge, and affinity to solvents facilitate the formation of small-sized NPs by isolating and dispersing metal ions. Meanwhile, Fe-Mo bonds significantly prolong the length of CNTs. The combination of Fe and Mo promotes gradual crystallization of NPs, suppresses excessive coalescence of the active components, and optimizes the adsorption energy of C 3 H 6 , thereby extending the catalyst lifetime. Additionally, the bonding between Mo and C atoms favors bulk diffusion of C within Fe NPs, avoiding excessive C deposition inside the NPs and enhancing structural stability. As a result, the CNTs grown with this catalyst exhibit a small tube diameter as low as 5.68 nm and a high ratio (M product /M catalyst ≈14), demonstrating promising application prospects. Download: Download high-res image (212KB) Download: Download full-size image
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Fucheng Liu,Yuhui Chen,Lei Zhuang,Hui Wang,Hulei Yu,Yanhui Chu
High-temperature materials with superior long-term oxidation resistance above 2000 °C are urgently sought for next-generation hypersonic vehicles. Here, (W 0.28 Ta 0.28 Mo 0.28 Cr 0.15 )(Al 0.2 Si 0.8 ) 2 -Al 2 O 3 dual-phase high-entropy alumino-silicides (HEAS-Al 2 O 3 ) are developed, which exhibit superior long-term oxidation resistance up to 2100 °C. To be specific, the as-fabricated HEAS-Al 2 O 3 samples are found to consistently follow an oxygen-diffusion parabolic law across 1700–2100 °C, possessing a high activation energy of 234.4 kJ mol −1 . Moreover, an ultralow oxidation depth of 0.4 mm after 120 min of laser oxidation and a linear plasma ablation rate of 0.026 μm s −1 at 2100 °C are achieved. Such remarkable oxidation resistance is mainly attributed to the increase in Al cations due to Al 2 O 3 incorporation, coupled with the inclusion of multiple cationic elements, to significantly enhance the rigidity of the glass network. Thereby, the viscosity and high-temperature stability of the resulting aluminosilicate glass are markedly improved, effectively protecting the underlying unoxidized HEAS-Al 2 O 3 . The as-developed HEAS-Al 2 O 3 shows great promise as a thermal structural candidate for next-generation hypersonic vehicles.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Xinhui Zhang,Aiping Wu,Dongxu Wang,Yanqing Jiao,Haijing Yan,Chengxu Jin,Ying Xie,Chungui Tian
The easily coupled HER and OER catalysts are highly desired for the hydrogen evolution by overall water splitting. Here, we design and synthesize Co-Mo based catalysts with adjustable electronic structure by tuning the Mo/Co ratio to give easily coupled, effective HER/OER catalysts. At lower Mo/Co ratio, the Mo component can move up the d-band center of the catalysts, rendering an enhanced capability of activating H 2 O to improve OER performance with a low overpotential of 223 mV at 10 mA cm −2 (η 10 ). Contrastingly, the Co component in the catalyst with higher Mo/Co ratio can induce the downward shift of the d-band center, optimizing the Gibbs free energy of hydrogen adsorption to enhance the HER activity (a low η 10 of 52 mV). These HER and OER catalysts with similar components can be coupled for overall water splitting. The electrolyzer can be driven by a solar panel to achieve effective H 2 production.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Junwei Liao,Zhonghai Liu,Yongjun Ling,Qian Zhang,Songbai Qiu,Juwen Gu,Jiajin Li,Huafeng Dong,Jinliang Song,Tiejun Wang
Direct upgrading of aqueous bio-ethanol into higher alcohols is an emerging and highly attractive protocol to produce bio-fuels. However, it remains a great challenge to achieve high yield and selectivity of long-carbon chain higher alcohols, especially for C 8+ alcohols. Herein, the carbon encapsulated NiMo catalysts were designed and fabricated for direct upgrading of aqueous bio-ethanol. The NiMo@C catalyst with Ni/Mo ratio of 6/1 exhibited excellent performance with 89.4 % of bio-ethanol conversion and 42.1C-mol% of higher alcohols yield. The selectivity of C 8-16 products reached 44.7 %, which can be directly hydrodeoxygenated to produce bio-jet fuels. Characterization and DFT calculation results revealed that the doping of Mo tuned the electronic state of Ni and modified the surface properties ( i.e. , hydrophilicity, lipophilicity, and [OH] − adsorption), which enhanced the interaction of active site (NiMo-[OH] − ) with intermediate aldehyde in the oil phase and promoted secondary upgrading reaction to form C 8-16 alcohols. This work provides a promising approach to produce bio-jet fuels by direct upgrading of biomass fermentation ethanol.
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SOLID STATE SCIENCES
·
2022
·
IF 3.752
Shijun Xu,Yi He,Siming Yan,Teng He,Hongjie Li,Xiao Guo,Yi Fan
Hydrogen energy is the most promising clean energy at present and hydrogen production by electrocatalytic water splitting is the frontier technology of alternative energy in the future. Herein, the Ni–Mo alloy supported with nickel foam (NF) was prepared by hydrogen reduction strategy at high temperature. The catalytic activity and stability of NiMo@NF-x catalyst (x stands for temperature) with multistage (sheet/particle) array structure were studied under different temperatures. The performance of the catalyst was evaluated by contact angle and related electrochemical characterization. It was found that the surface of NiMo@NF-550 catalyst prepared at 550 °C had superhydrophilic and superaerophobic properties, which contributed to the deactivation of bubbles from the surface of the electrode and improved the efficiency of the catalytic reaction. Moreover, the multi-stage array structure of sheet/particle will form a greater specific surface area than the plain sheet structure, offering more reaction sites. These results indicate that the self-supported superhydrophilic and superaerophobic Ni–Mo catalysts have excellent electrocatalytic hydrogen evolution ability.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Fanghui Wang,Yajun Zhang,Yimeng Luo,Yanan Wang,Hong Zhu
A dandelion-like CNTs-Ni foam composite carrier supported Co–Mo–P ternary alloy catalyst (Co–Mo–P/CNTs-Ni foam) was prepared by electroless plating . The structure of Co–Mo–P/CNTs-Ni foam catalyst is characterized by XRD , SEM, XPS and EDS . The particle size of Co–Mo–P ternary alloy nanoparticles is about 80 nm. The Co–Mo–P/CNTs-Ni foam completely retains the tubular structure of carbon nanotubes and the gaps between carbon nanotubes of CNTs-Ni carrier, which increases the specific surface area of the catalyst and the flow space of reactants and products. Co–Mo–P/CNTs-Ni foam catalyzes sodium borohydride alcoholysis to produce hydrogen at a maximum rate of 2.64 L ·min −1 ·g −1 , and the reaction activation energy is 47.27 kJ ·mol −1 , which is far lower than that of the spontaneous alcoholysis reaction of sodium borohydride. After the Co–Mo–P/CNTs-Ni foam catalyst was reused 8 times, the catalytic hydrogen production rate was reduced by 23% compared with the initial rate.
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