JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2023
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IF 9.9
Jingwei Liang,Shaobin Li,Fengbo Li,Li Zhang,Yufeng Jiang,Huiyuan Ma,Kun Cheng,Liang Qing
The pursuit of cost-effective catalysts for electrocatalytic overall water splitting continues to present a significant challenge in the field. A molybdenum (Mo)-regulated Co 9 Se 8 /FeNiSe self-supporting electrode material with rich vacancy defects has been prepared by hydrothermal reaction. Doping of Mo atoms not only can form rich selenium vacancy defects to enrich the inherent activity of the catalyst, but also expose more active sites. The intrinsic electronic architecture of the interface catalysis is regulated and optimized through the introduction of heteroatom Mo, resulting in the exceptional catalytic activities of the Mo-Co 9 Se 8 /FeNiSe heterostructure. Additionally, the Faraday efficiency of hydrogen (H 2 ) and oxygen (O 2 ) production approaches 100 %. The voltage required for the water-splitting system is only 1.58 V (10 mA cm −2 ), and 100 h stability test at 100 mA cm −2 demonstrates no decay. This work presents a new perspective for the reasonable design and synthesis of non-precious metal selenide-based bifunctional electrocatalysts.
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JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2023
·Vol. 32
·期 8
·2460-2477
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IF 3.1
Wu Duoli,Wu Haotian,Yuan Ziyi,Wei Xinlong,Zhang Chao
To investigate the influence of Mo addition and water vapor content on the high-temperature corrosion resistance of Ni-Al-based coatings, 0Mo, 5Mo, and 10Mo coatings were deposited by APS thermal spray onto stainless steels. The chlorine-induced corrosion test was conducted in an experimental environment simulating a biomass boiler. The results show that adding the Mo element lowers the coating's ability to resist corrosion without water vapor. The coating is more prone to peeling because Mo prevents the coating from eventually forming a protective oxide layer. Water vapor significantly speeds up the production of oxides and modifies their morphology and structure. The combined effects of Mo and water vapor increase the coating's ability to resist corrosion. The development of thick and protective Ni and Al oxide layers on the coated surface is aided by the acceleration of oxide production by water vapor and the alteration of oxide structure by Mo components.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Xinlu Yang,Xinyu Xie,Siqi Li,Wenxuan Zhang,Xiaodan Zhang,Hongxiang Chai,Yuming Huang
Herein, we reported the design and fabrication of polyoxometalates coupling metal-organic framework (POM@MOF) hybrids derived hierarchical hollow Mo/Co bimetal oxides nanocages (Mo/Co HHBONs) for the peroxymonosulfate (PMS) activation to degrade levofloxacin (Lev). The Mo/Co HHBONs are hollow nanocages with high specific-surface areas and hierarchical micropores, mesopores , and macropores . In addition to compositional modulation, polyoxometalate (H 3 PMo 12 O 40 ·nH 2 O) exhibited striking effect on the textural properties of Mo/Co HHBONs. The Mo/Co HHBONs had outstanding catalytic activity with first order-kinetics that were 6 − 10 times higher those previously reported. They exhibited good adaptability over a pH range of 3 − 11, as well as excellent universality and reusability. By altering the surface porosity, electronic structure, and oxygen vacancies of Co 3 O 4 , hetero-metal Mo doping induced Mo/Co HHBONs significantly promote the generation of reactive oxygen species , including • OH, SO 4 •− , O 2 •− , and 1 O 2 . Density functional theory indicated that Mo/Co HHBONs had better adsorption, enhanced electron-transfer abilities, and a longer O-O bond length than did Co 3 O 4 , for improved catalytic reactivity. This research provides a new strategy to design the POM@MOF hybrids derived hierarchical hollow nanocages with highly PMS activating capacity for the removal of antibiotics and other refractory contaminants.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Yu Huang,Yihui Wu,Zejie Zhang,Lanlan Yang,Qianhao Zang
Exploring cost-effective and high-efficiency noble-metal free electrocatalysts for oxygen evolution reaction (OER) are of critical importance to the area of renewable energy storage and conversion systems. Herein, Ni–Fe–Mo films were fabricated via electrodeposition method with a very high current density. The film exhibits excellent activity towards OER with a overpotentials of 306 mV at current density of 10 mA·cm −2 and a lower Tafel slope of 77.1 mV·dec −1 under alkaline conditions (30 wt.% KOH). The synergistic effect of the Mo, Ni, and Fe contribute the improved catalytic activity for OER.
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CARBON
·
2020
·
IF 8.821
Sen Xue,Weimin Zhang,Qing Zhang,Jinhong Du,Hui-Ming Cheng,Wencai Ren
Water electrolysis in alkaline electrolyte is a promising technology for large-scale hydrogen production . However, the hydrogen evolution reaction (HER) is quite sluggish in alkaline electrolyte. Developing highly active and stable non-noble metal electrocatalysts is highly desired to solve this issue but of great challenge. Here, we report a catalyst constructed by Ni–Mo–N nanoparticles decorated on nitrogen-doped reduced graphene oxide (Ni–Mo–N/NG). Due to the high intrinsic electrocatalytic activity of heterostructured Ni–Mo–N nanoparticles and synergistic effects between the nanoparticles and graphene, the catalyst exhibits excellent HER electrocatalytic activity with zero onset potential and 46.6 and 159.8 mV overpotentials for 10 and 100 mA cm −2 , respectively, in alkaline electrolyte at low mass loading. Such electrocatalytic performances exceed those of many reported non-noble metal catalysts even with much higher mass loading, demonstrating the great potential of our Ni–Mo–N/NG catalysts for hydrogen production by water electrolysis.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Yongqiang Ren,Xiuyan Li,Yinan Wang,Qinghua Gong,Shaonan Gu,Tingting Gao,Xuefeng Sun,Guowei Zhou
Hollow ternary metal oxides have shown enormous potential in lithium-ion batteries (LIBs), which is ascribed to their complex chemical composition, abundant active defect sites, and the synergy effect between metals. In this work, we synthesized Mo-doped NiCo 2 O 4 porous spheres with yolk-shell structure by using a simple self-templating method. Surprisingly, other than the yolk-shell structure we had obtained, the inner core of the yolk-shell was also porous, which could fully enhance the electrolyte infiltration and promote the transmission of lithium ions (Li + ) and electrons (e − ). The diameter of the porous core in the yolk-shell sphere was about 530 nm, and the outer shell's thickness was up to 110 nm. In addition, the unique pores in the core appeared in the diameter of about 85 nm. With this structure, the volume expansion of the anode could be well inhibited during charge/discharge. It exhibited prominent electrochemical performance with high reversible capacity (1338 mA h g −1 at 100 mA g −1 ), satisfactory cycle life (1360 mA h g −1 after 200 cycles at 100 mA g −1 ), and exceptional rate capability (820 mA h g −1 at 2000 mA g −1 ) as anode material in LIBs.
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Science China-Chemistry
·
2021
·Vol. 64
·期 10
·1716-1722
·
IF 9.445
Chao Yuguang,Zhang Weiyu,Zhou Peng,Chen Hui,Lu Shiyu,Li Menggang,Zhang Qinghua,Gu Lin,Guo Shaojun
Atomic sites co-catalyst (ASC) on photocatalytic materials possesses an attractive prospect to promote charge carrier separation and tune surface reaction kinetics, yet the synthesis of earth-abundant ASC under low temperature remains a great challenge. Here, a novel in-situ NH 4 + -etched strategy to anchor atomic Mo sites on ZnIn 2 S 4 hierarchical nanotubes (HNTs) with abundant mesopores under mild conditions for promoting charge carrier separation and enhancing light multi-reflections is developed for efficient photocatalytic H 2 evolution. Density functional theory calculations and linear sweep voltammetry demonstrate that the well-defined Mo-S 2 O 1 sites with distinctive coordination configuration and electronic property contribute to the enhanced separation of photo-generated charge carriers and reduced Gibbs free energy for H 2 evolution. Consequently, the well-defined MoSA-ZIS HNTs present an excellent photocatalytic activity with a rate of 29.9 µmol h −1 (5.98 mmol g −1 h −1 ), which is 7.3 times higher than that of ZnIn 2 S 4 nanosheets (NSs), to be among the best ZnIn 2 S 4 -based photocatalysts. The present strategy breaks the high-temperature limitation of conventional top-down thermal dissociation/emitting approach for anchoring non-noble metal atomic sites on catalyst support.
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REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Lihua Liu,Zhengchi Yang,Lu Zhao,Gang Su,Zuoxiao Wei,Anping Tang,Jianrong Xue
A novel poly(N 1 ,N 1 ,N 6 ,N 6 -tetraallylhexane-1,6-diammonium dichloride) (PTAHDADC) microparticle was prepared via inverse emulsion polymerization . The adsorption characteristics and mechanism for Mo(VI) in an aqueous solution were investigated systemically. Results showed that PTAHDADC had a high positively charge density with a positive charge at every six CH 2 (or CH ) units and presented a coral-like morphology, with macropores distributed in 30–130 μm, and a porosity of up to 46.52%. The Mo(VI) removal efficiency was >99% at pH = 3.0–4.0. The adsorption data could be effectively described using the Langmuir and pseudo-second-order kinetic models . The maximum adsorption capacity was up to 394.11 mg·g −1 at 293 K. The adsorption process was rapid, and reached equilibrium within 120 min with an adsorption activation energy E a of 41.15 kJ·mol −1 . The adsorption process of Mo(VI) by PTAHDADC was accompanied by the partial ion exchange of counterion Cl − , the partial deprotonation of functional groups ( CH 2 ) 3 N + H on PTAHDADC, and the new interaction and bond formation between Mo(VI) and PTAHDADC. Mo(VI) removal by PTAHDADC was a process of spontaneously endothermic entropy increment, which involves physisorption , electrostatic attraction, ion exchange, and chemisorption . PTAHDADC offers a simple synthesis and excellent adsorption performance and recyclability. Therefore, PTAHDADC is a highly potential adsorbent for removing Mo(VI) ions from wastewater and has a broad application prospect.
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ACS Applied Materials & Interfaces
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2018
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IF 8.097
Yalan Chen,Jingtong Zhang,Peng Guo,Haijun Liu,Zhaojie Wang,Ming Liu,Tian Zhang,Shutao Wang,Yan Zhou,Xiaoqing Lu,Jun Zhang
Hydrogen evolution reaction (HER) driven by high-performance and low-cost electrocatalysts has been well-identified as one of the most promising technologies to explore sustainable power sources. In this work, the authors demonstrated a series of Fe–Mo selenide composite nanomaterials with adjustable HER catalytic activities by a simple one-step hydrothermal reaction. The heterostructured catalyst exhibited significant enhancement in HER activity compared to the pristine MoSe2 and FeSe2 catalysts. It is found that the optimized Mo–Fe selenide can drive the HER at a current density of 10 mA cm–2 by an overpotential of 86.9 mV in acidic solution. Also, it possesses outstanding kinetics (Tafel slope of 57.7 mV dec–1) of the electrochemical reaction. Besides the synergistic effect of different chemicals, the coupled Mo–Fe selenide achieved the electronic modulation of the heterointerface, where electrons were accelerated to transfer from dispersed FeSe2 to the active edges on 1T-MoSe2 and further activated the electrochemical performance.
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CATALYSIS COMMUNICATIONS
·
2015
·
IF 3.699
Yangang Wang,Yangling Xu,Yunzhu Wang,Hengfei Qin,Xi Li,Yuanhui Zuo,Shifei Kang,Lifeng Cui
Molybdenum doped graphitic carbon nitride (g-C 3 N 4 ) catalysts were prepared by a simple pyrolysis method using melamine and ammonium molybdate as precursors. The characterization results indicated that the obtained Mo-doped g-C 3 N 4 catalysts had worm-like mesostructures with higher surface area. Introduction of Mo species can effectively extend the spectral response property and reduce the recombination rate of photogenerated electrons and holes. CO 2 photocatalytic reduction tests showed that the Mo-doped g-C 3 N 4 catalysts exhibited considerably higher activity (the highest CO and CH 4 yields of 887 and 123 μmol g − 1 -cat., respectively, after 8 h of UV irradiation.) compared with pure g-C 3 N 4 from melamine.
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Processes
·
2025
·Vol. 13
·期 1
·156
·
IF 2.8
Ting Guan,Liang Fang,Fang Wu,Yongxia Yang
NiFe-layered double hydroxide (NiFe-LDH) and La-, Mo- or W-doped NiFe-LDH microparticles (NiFeX-LDH, X = La, Mo, W) were synthesized via the co-precipitation method. Their adsorption characteristics were evaluated by the removal of methyl orange (MO) and hexavalent chromium (Cr6+). The effects of the metal ion doping type, doping concentration (0–3at%), pH and temperature on the MO adsorption properties were systematically studied. The results show that W-doped NiFe-LDH exhibits superior MO removal capacity compared to undoped or La- or Mo-doped NiFe-LDH at the same 1at% doping level, which is attributed to the increased layer charge density and strong affinity for the π-electron systems of MO molecules. The NiFeW-LDH-1at% sample demonstrated the best MO adsorption performance within the W-doping range of 0–3at%, achieving a superior adsorption capability of 666.67 mg/g with a significantly shorter equilibrium time (10–120 min) compared to the similar LDH. NiFeW-LDH-1at% showed promising reusability, with its adsorption efficiency remaining 78.3% of its initial level after five adsorption–desorption cycles. The MO uptake onto NiFeX-LDH was attributed to the combined effect of anion exchange and the attraction of layer charge. In addition, the adsorption of NiFeW-LDH-1at% matched well with the Langmuir isotherm model and pseudo-second-order kinetic model, indicating a monolayer and chemical adsorption. Furthermore, NiFeW-LDH-1at% effectively adsorbed of Cr2O72−in the aqueous solution, revealing that W doping significantly enhances Cr(VI) removal performance. The maximum theoretical adsorption capacity onto NiFeW-LDH-1at% reached 63.25 mg/g, which was notably higher than that of the pristine NiFe-LDH adsorbent (53.56 mg/g). Overall, the W-doped NiFe-LDH material, as a low-cost and highly efficient adsorbent, shows great potential for wastewater treatment application.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Jinshuo Bai,Yinan Zhang,Zixin Pan,Xiangru Yin,Guixiang Yang,Dequan Zhang,Hua Zhou,Xiaoping Liang
Amorphous tungsten trioxide (a-WO 3 ) films were prepared on ITO conductive glass via electrodeposition and subsequently crystallized to obtain crystalline WO 3 (c-WO 3 ) films by heating a-WO 3 . A dual-phase stacked WO 3 film was fabricated by covering Mo-a-WO 3 film onto c-WO 3 /ITO substrate using electrodeposition and thermal-assisted electrodeposition methods, respectively. Optimization of electrochromic performance was achieved by varying Mo doping levels (0∼5 atom%). Results demonstrate that appropriate Mo doping (3 atom%) enhances the electrochromic properties of a-WO 3 films. Mo doping introduced structural distortions that reduced energy barriers and enhanced ion mobility, leading to improved electrochemical and electrochromic properties. The intermediate c-WO 3 layer improves adhesion between a-WO 3 top film and ITO glass substrate, while the porous structure of a-WO 3 layer increases the number of active sites for electrochromic reactions. Mo3-a-WO 3 /c-WO 3 dual-phase stacked film with doping 3 atom% Mo shows an optical modulation range of 83.4 % at 633 nm, a coloration efficiency of 74.3 cm 2 /C, rapid response time (bleaching/coloration: 3.4 s/6.1 s), and 86.6 % retention of its maximum current density after 2000 cycles, respectively. The high oxidation ion diffusion coefficient (3.53 × 10 −10 cm 2 /s) and reduction diffusion coefficient (1.55 × 10 −10 cm 2 /s) were also observed. This dual-phase stacked film shows significant improvements in electrochromic performance due to the synergistic effects between the dual phases and Mo-doping. Electrochromic device (ECD) assembled with Mo3-a-WO 3 /c-WO 3 dual-phase films as the working electrode, ITO glass as the counter electrode, and 1 mol/L LiClO4/PC solution as the electrolyte exhibited an optical modulation range of 74.2 % and response time (bleaching/ coloring) of 6.8 s/3.7 s. These findings confirm that ECD with Mo-a-WO 3 /c-WO 3 dual-phase films offer excellent electrochromic performance.
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