RARE METALS
·
2024
·Vol. 43
·期 6
·2613-2622
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IF 9.6
Zhang Bao-Jie,Chang Bin,Qiu Shi-Peng,Zhao Gang,Wang Xiao,Xu Xi-Jin,Mu Lan,Liao Wen-Bo,Dong Xiao-Jing
To effectively address energy challenges, it is crucial to explore efficient and stable bifunctional non-precious metal catalysts. In this study, a Mo-doped nickel–iron layered double hydroxide with flower-cluster architecture was successfully prepared by a one-step hydrothermal method, which demonstrated a good water splitting performance. After an appropriate amount of Mo doping, some lattice distortions in the material provided reactive sites for the adsorption and conversion of intermediates, thus optimising the charge distribution of the material. Moreover, the multidimensional void structures formed after doping had a larger specific surface area and accelerated the penetration of the electrolyte, which significantly improved the activity of the catalyst in alkaline media. At 10 mA·cm −2 , the hydrogen and oxygen evolution overpotentials of Mo-doped nickel–iron double hydroxides (Mo–NiFe LDH/NF-0.2) were 167 and 220 mV, respectively, with an excellent durability up to 24 h. When the Mo–NiFe LDH/NF-0.2 catalyst was used as the cathode and anode of an electrolytic cell, the catalyst achieved a current density of 10 mA·cm −2 at an applied voltage of 1.643 V. This study provides a novel approach for designing excellent bifunctional electrocatalysts containing nonprecious metals. Graphical abstract
研究领域:
能源转换
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材料科学
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电化学
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催化
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纳米技术
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Heming Sun,Xiaonian Tang,Shuo Li,Ye Yao,Li Liu
The construction of the materials with one-dimensional (1D) hollow structure using Metal-organic frameworks (MOFs) as the templates has attracted much attention for applied in various fields. Herein, MOF-derived 1D Ru/Mo co-doped Co 3 O 4 hollow microtubes have been obtained via a simple solvothermal method . The as-synthesized samples are characterized by using XRD, FESEM , TEM , XPS, PL and BET. The sensing measurement reveals that when doping amount of Mo and Ru is 1% and 0.3%, the Co 3 O 4 sample exhibits the best sensing performance. Specially, 0.3% Ru/Mo-Co 3 O 4 sample exhibits high responses of 126–100 ppm TEA at a low operating temperature of 160 °C, which are about 18.5 times than that of pure Co 3 O 4 . Furthermore, it shows rapid response/ recovery speed (5 s/7 s), good selectivity and repeatability as well as excellent long-term stability. The good TEA sensing performance is attributed to the construction of 1D hollow architecture and synergistic effect of Ru/Mo co-doping. Thus, it is expected to be a promising sensing material for high-performance detection of TEA gas. In addition, this work provides an useful inspiration for preparation of MOF-derived materials with 1D hollow architecture for achieving excellent performance in various fields.
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RARE METALS
·
2023
·Vol. 42
·期 8
·2592-2600
·
IF 8.8
Chen Jing,Chen Xuan-Le,Lu Rou,Li Yong,Pan An-Qiang
Molybdenum dioxide has aroused a wide concern as anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity and high density. However, it still faces the problems of large volume changes and low electronic conductivities, which limits its practical application. Herein, necklace-like N-doped carbon nanofibers encapsulating MoO 2 nanospheres (MoO 2 @NCNFs) with Mo–C bonding have been designed to address these issues. The rational design carbon coating structure can not only enhance the electron transfer, but also markedly strengthen structural stability. As expected, the as-prepared electrode showed superior lithium storage capacity, including a high specific capacity of 1120 mAh·g −1 at 0.1 A·g −1 , and good rate performance of 502 mAh·g −1 at 4.0 A·g −1 and a prolonged cycling stability of 490 mAh·g −1 capacity retention over 3000 cycles at 4.0 A·g −1 . Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 16
·48389-48400
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IF 5.8
Zhao Huanxin,Chen Wenkai,Wu Dan,Liu Xinyue,Hu Wanjie,Zhang Xuejun
Although heterogeneous cobalt-based catalysts have been widely studied and used in SO 4 •− based advanced oxidation processes, the efficiencies were still not high enough due to the limiting step of Co(III)/Co(II) cycle in the system. In this study, a bimetallic oxide composed of Co and Mo was designed and used for enhancing the performance of peroxymonosulfate activation on organic pollutants removal. The CoMoO 4 nanorods exhibited superior catalytic activity for methylene blue (MB) degradation than Co 3 O 4 , MoO 3 , and their mechanical mixture, which was attributed to the synergetic effect between Co and Mo. CoMoO 4 nanorods were able to efficiently degrade MB under a wide pH range of 3–11 and could maintain high efficiency in 5 cycles with less leakage of metal ions. Moreover, CoMoO 4 nanorods displayed broad spectrum applicability to the different water matrix and a variety of pollutants such as phenol and Congo red. The Co(II) was proved to be the main active site of the catalyst, while Mo played an important role in promoting the Co(III)/Co(II) cycle. Surface free radicals are the main active species in the degradation process. This work provides new insights into the design of cobalt-based bimetallic catalyst and the improvement on PMS activation.
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PubMed
高影响因子
ChemElectroChem
·
2023
·Vol. 10
·期 3
·e202201087
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IF 4
Shaojie Gao,Ping Li,Yao Shi,Yi He,Lecheng Lei,Shaoyun Hao,Xingwang Zhang
Graphical Better with defects : A ternary alloy PtCoMo nanocatalyst with dual surface Co and Mo vacancy defects was used as an efficient electrocatalyst for acidic oxygen reduction reaction for fuel cell applications. Proton exchange membrane fuel cell (PEMFC) is considered as the most promising energy conversion technology, which is hampered by the unsatisfied activity and high loading of Pt. The performance of Pt-based catalyst toward PEMFC depends on the surface bond length of Pt−Pt, which is closely related to the surface defect engineering. Here we firstly present a ternary alloy PtCoMo nanocatalyst with dual surface Co and Mo vacancy defects (V Co−Mo −PtCoMo) that compressed the Pt−Pt bonds, thus exhibiting an outstanding activity toward oxygen reduction reaction (ORR) with a mass activity of 0.57 A mg Pt −1 at 0.9 V (RHE, reversible hydrogen electrode), which is 5.2 times higher as compared with commercial Pt/C (20 wt %) in 0.1 M HClO 4 . The characterizations and density functional theory calculations demonstrate that the Pt−Pt bonds are significantly compressed through the dual surface defects, thus weakening the binding energy and effectively enhancing the acidic ORR performance.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2023
·
IF 6.4
Shu-Xin Yan,Guo-Dong Sun,Jian-Ping Xu,Jia Xu,Fu-Fa Wu
Simultaneous achieving the second-phase particle strengthening, high density, and fine grain is a great difficulty for designing and preparing Mo alloys . In this study, the effects of γ-Al 2 O 3 and Y 2 O 3 nanoparticles on the microstructures and properties of Mo composites prepared via spark plasma sintering (SPS) were systematically investigated. It was found that for pure Mo and Mo–Y 2 O 3 powders, Mo compact with both high density and fine grain size can't be achieved. However, Mo-Al 2 O 3 composite with both a relatively high density (98%) and a fine grain size (1.67 μm) was synthesized successfully. The small γ-Al 2 O 3 particles transformed into larger κ-Al 2 O 3 particles by obvious grain boundary migration and grain growth in the sintering process, which effectively pinned the migration of Mo grain boundary with few effects on the surface atom diffusion of Mo. Moreover, there was a crystallographic orientation relationship between the κ-Al 2 O 3 particles and Mo matrix (Mo (110)//Al 2 O 3 ( 13 4 ‾ 1 )). Ultrafine Mo composite containing dispersed Al 2 O 3 particles with stable boundary adhesion can efficiently hinder dislocation movement and crack propagation , resulting in the obvious enhancements of bending strength , hardness and compressive yield strength.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Peilin Wu,Lin Gao,Liuyan Dong,Zihan Lin,Lili Cui
To prepare bifunctional electrocatalyst towards HER and OER is extremely important for promoting the development of electrochemical water splitting technology. Herein, the element doping method is employed to tune the electron environment of cobalt phosphide (CoP). The Mo-doped CoP supported on carbon cloth (CC) is constructed by solvothermal and annealing method. The effect of Mo on the electron modulation of CoP during different phosphating time was studied carefully. It is noted that the Mo play an important role in tuning the electron state of Co and P elements which can trap the electron and was reduced to low valence, then transfer the electron to Co and P. With increasing the phosphating time, the electron transfer phenomenon between Mo and CoP is obvious. Benefiting from the electron engineering of Mo, Co and P as well as thin and wrinkle sheets structure, the optimal electrocatalyst only requires 39 mV and 251 mV to deliver 10 mA cm −2 for HER and OER, respectively. Also, as for the whole water splitting performance, it delivers 10 mA cm −2 at cell voltage of 1.56 V. Importantly, Faraday efficiency of the optimal catalyst achieves 99.9% for HER due to the tuned electron state of Co and P, high ECSA and low R ct .
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Xinyang Dong,Yundong Cao,Jiayuan Zhang,Linlin Fan,Mingliang Wang,Hong Liu,Guanggang Gao
Lithium-sulfur batteries (LSBs) present wide range of market and tremendous application potential. Nevertheless, the “shuttle effect” of lithium polysulfides (LiPSs) and the sluggish redox kinetics restrict their large-scale application. We report herein the Mo-substituted Keggin type H 3 PW 10 Mo 2 O 40 (PW 10 Mo 2 ) evenly decorated on the MWCNTs conductive framework by electrostatic attraction as the functional interlayer materials. W and Mo atoms in PW 10 Mo 2 provide chemical adsorption sites for polysulfides, and density functional theory (DFT) calculations further confirm that Mo sites possess stronger capture ability to LiPSs than that of W sites. Meanwhile, the Mo implantation can effectively expedite the redox reaction of LiPSs. Furthermore, MWCNTs afford the plentiful attachment points for PW 10 Mo 2 , thus exposing abundant active sites to adsorb and catalyze polysulfides. The resulting cells demonstrate superior discharge capacity of 1064.9 mAh g −1 under 0.2C up to 100 cycles as well as excellent long-life cycling stability with low recession rate of 0.051 % under 3C up to 1000 cycles. Our work illustrates the effect of Mo atom substitution of polyoxotungstates as interlayer materials and thereby provides a new strategy for developing LSBs with superior reversible capacity and long cycling performance.
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Carbon Energy
·
2023
·
IF 20.5
Zhichao Jia,Yang Yuan,Yanxing Zhang,Xiang Lyu,Chenhong Liu,Xiaoli Yang,Zhengyu Bai,Haijiang Wang,Lin Yang
Transition-metal oxyhydroxides are attractive catalysts for oxygen evolution reactions (OERs). Further studies for developing transition-metal oxyhydroxide catalysts and understanding their catalytic mechanisms will benefit their quick transition to the next catalysts. Herein, Mo-doped CoOOH was designed as a high-performance model electrocatalyst with durability for 20 h at 10 mA cm −2 . Additionally, it had an overpotential of 260 mV (glassy carbon) or 215 mV (nickel foam), which was 78 mV lower than that of IrO 2 (338 mV). In situ, Raman spectroscopy revealed the transformation process of CoOOH. Calculations using the density functional theory showed that during OER, doped Mo increased the spin-up density of states and shrank the spin-down bandgap of the 3d orbits in the reconstructed CoOOH under the electrochemical activation process, which simultaneously optimized the adsorption and electron conduction of oxygen-related intermediates on Co sites and lowered the OER overpotentials. Our research provides new insights into the methodical planning of the creation of transition-metal oxyhydroxide OER catalysts.
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Catalysis Science & Technology
·
2022
·Vol. 12
·期 24
·7510-7519
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IF 6.177
Biyun Fang,Jiahui Li,Fangming Liu,Chuanfeng Zhang,Chunyan Li,Jun Ni,Jianxin Lin,Bingyu Lin,Lilong Jiang
The development of a Co–Mo bimetallic catalyst played a crucial role in ammonia synthesis. However, its underlying mechanism is not well understood and the optimal catalyst has yet to be obtained. Herein, we designed two methane-treated ceria-supported Co–Mo bimetallic catalysts with different dispersions and segregations of Mo and Co species by changing the order of addition of Mo and Co species. There is the segregation of Mo and Co species on the surface of the catalyst with the subsequent addition of Co and Mo species (Mo/Co–C), leading to a higher proportion of low oxidation states of Mo species as well as a larger amount of exposed Mo and Co species, oxygen vacancies and concentration of Ce3+. As a result, there is a larger amount of nitrogen and hydrogen species adsorbed on Mo/Co–C, and the migration and exchange of the adsorbed hydrogen species are also boosted. Mo/Co–C shows 1.7 times higher ammonia synthesis activity and a superior pressure effect in ammonia synthesis than its counterpart obtained by the simultaneous addition of Co and Mo species. These findings are essential for the further development of bimetallic catalysts.
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Biomass Conversion and Biorefinery
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2022
·
IF 4.05
Chen Jiajia,Xiu Pengcheng,Gu Xiaoli
Lignin is the world’s greatest renewable aromatic biomass resource, with considerable potential for the development of high-value-added compounds. Herein, wet impregnation was employed to create Co-Mo/ATP-CZO bimetallic catalysts, which were then used to catalyze the depolymerization of lignin in ethanol and isopropanol. The findings of the characterization revealed that doping Mo metals resulted in the change of metallic oxide phase, which increased the oxygen vacancy (O V ), improved metal-carrier interaction, and decreased acid center content. The results of the experiments demonstrated that catalytic hydrogenation with a 12Mo-20Co/ATP-CZO catalyst at 240 °C for 8 h produced the maximum yield of bio-oil (57.44 wt%, including 37.58 wt% of monomer). Under these conditions, the bio-oil had a higher heating value of 33.20 MJ/kg, which was significantly higher than the alkali lignin’s 19.62 MJ/kg. Catalyst stability tests also revealed good recyclability. This research will provide an efficient method for depolymerizing lignin. Graphical abstract
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Wenhao Chen,Junrong Zeng,Gaowei Zhang,Jie Yu,Yejun Qiu
Developing efficient bifunctional catalysts for hydrogen and oxygen evolution reactions (HER/OER) has attracted great interest in hydrogen production from water splitting. In this work, a novel material of Mo-doped NiFe x nanospheres on 3D graphene fibers (Mo-NiFe x /3DGFs) has been successfully fabricated through a simple and cheap one-step electrodeposition method. The Mo-NiFe x /3DGFs possessed ultra-high conductivity and specific surface area, greatly benefiting to electrocatalytic hydrolysis activity. And it was found that Fe element could obviously promote OER process, while Mo doping facilitated both OER and HER reactions. We proved that there existed synergetic roles between Fe and Mo element, which could realize the control of the electronic structure and optimize the adsorption/desorption of intermediates. And electrochemical tests showed that the Mo–Ni/3DGFs exhibited a relatively smaller overpotential of 109.9 mV for HER, while the Mo-NiFe x /3DGFs presented better OER performance with an overpotential of 240.8 mV at the current density of 100 mA cm -2 in 1.0 M KOH. Finally, a system for overall water splitting constructed by Mo–Ni/3DGFs||Mo–NiFe 0.68 /3DGFs electrodes has a low cell voltage of 1.52 V at 10 mA cm −2 and long-term stability, exceeding most of literature results. Our findings provide insight into possibilities for the simple synthesis of high-performance and cheap catalysts, and laid the foundation for the practical application of transition metal catalysts .
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