ACS Catalysis
·
2016
·
IF 9.307
Jiajun Wang,Wei Wang,Zongyuan Wang,Jingguang G. Chen,Chang-jun Liu
Highly efficient and stable electrochemical catalysts of porous one-dimensional (1D) MS2/MO2 (M = W, Mo) nanorods have been developed for the hydrogen evolution reaction (HER). The materials are synthesized via a “low-temperature conversion” method. The as-prepared catalysts exhibit numerous advantages: abundant amount of exposed MS2 edges, high conductivity, and enhanced mass transport. The MS2/MO2 nanorods show efficient HER activity.
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RSC Advances
·
2018
·Vol. 8
·期 49
·27686-27694
·
IF 2.936
Xue Yu,Shuying Cheng,Qiong Yan,Jinling Yu,Wen Qiu,Zhengji Zhou,Qiao Zheng,Sixin Wu
Cation substitution plays a crucial role in improving the efficiency of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. In this work, we report a significant efficiency enhancement of flexible CZTSSe solar cells on Mo foils by partial substitution of Cu+ with Ag+. It is found that the band gap (Eg) of (Cu1−xAgx)2ZnSn(S,Se)4 (CAZTSSe) thin films can be adjusted by doping with Ag with x from 0 to 6%, and the minimum Eg is achieved with x = 5%. We also found that Ag doping can obviously increase the average grain size of the CAZTSSe absorber from 0.4 to 1.1 μm. Additionally, the depletion width (Wd) at the heterojunction interface of CAZTSSe/CdS is found to be improved. As a result, the open-circuit voltage deficit (Voc,def) is gradually decreased, and the band tailing is suppressed. Benefiting from the enhanced open-circuit voltage (Voc), the power conversion efficiency (PCE) is successfully enhanced from 4.34% (x = 0) to 6.24% (x = 4%), and the Voc,def decreases from 915 to 848 mV.
研究领域:
光伏技术
·
材料科学
·
薄膜太阳能电池
·
半导体材料
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Small
·
2022
·Vol. 18
·期 40
·2203835
·
IF 15.153
Shasha Guo,Toshinari Koketsu,Zhiwei Hu,Jing Zhou,Chang-Yang Kuo,Hong-Ji Lin,Chien-Te Chen,Peter Strasser,Lijun Sui,Yu Xie,Jiwei Ma
Transition metal oxides (TMOs) as high-capacity electrodes have several drawbacks owing to their inherent poor electronic conductivity and structural instability during the multi-electron conversion reaction process. In this study, the authors use an intrinsic high-valent cation substitution approach to stabilize cation-deficient magnetite (Fe 3 O 4 ) and overcome the abovementioned issues. Herein, 5 at% of Mo 4+ -ions are incorporated into the spinel structure to substitute octahedral Fe 3+ -ions, featuring ≈1.7 at% cationic vacancies in the octahedral sites. This defective Fe 2.93 ▫ 0.017 Mo 0.053 O 4 electrode shows significant improvements in the mitigation of capacity fade and the promotion of rate performance as compared to the pristine Fe 3 O 4 . Furthermore, physical-electrochemical analyses and theoretical calculations are performed to investigate the underlying mechanisms. In Fe 2.93 ▫ 0.017 Mo 0.053 O 4 , the cationic vacancies provide active sites for storing Li + and vacancy-mediated Li + migration paths with lower energy barriers. The enlarged lattice and improved electronic conductivity induced by larger doped-Mo 4+ yield this defective oxide capable of fast lithium intercalation. This is confirmed by a combined characterization including electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), galvanostatic intermittent titration technique (GITT) and density functional theory (DFT) calculation. This study provides a valuable strategy of vacancy-mediated reaction to intrinsically modulate the defective structure in TMOs for high-performance lithium-ion batteries.
研究领域:
材料科学
·
电化学
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能源存储
·
无机化学
·
固体物理
·
纳米材料
·
锂离子电池
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Shengming Cheng,Xingxing Cheng,Fuqiang Guo,Donghai An,Jiansheng Zhang
Development of robust and corrosion-resistant anodes is crucial for large-scale alkaline industrial coal gasification wastewater (CGW) electrolysis in an anion-exchange membrane water electrolyser (AEMWE). Herein, we develop a corrosion strategy to construct a self-supported electrocatalyst (CoNiFe@Mo–Ni 3 S 2 ) with high mechanical stability by anchoring the CoNiFe medium-entropy alloy catalytic layer onto a dense interlayer of Mo–Ni 3 S 2 support. The CoNiFe@Mo–Ni 3 S 2 catalyst exhibits a strengthened heterophase between the crystalline Mo–Ni 3 S 2 interlayer and amorphous CoNiFe catalytic layer, significantly facilitating electron diffusion and reaction kinetics. In 1 M KOH +50% CGW, the CoNiFe@Mo–Ni 3 S 2 electrode delivers low apparent anodic overpotentials of 124 and 202 mV at 50 and 100 mA cm −2 , respectively, where OER is coupled with the electrooxidation of ammonia nitrogen and organic pollutants. The CoNiFe@Mo–Ni 3 S 2 -based AEMWE single cell further achieves a current density of 0.5 A cm −2 at 1.74 V. Remarkably, the system simultaneously achieves 92.6% ammonia-nitrogen removal and 51.4% chemical oxygen demand (COD) reduction. Post-reaction Raman, XRD, and XPS analyses reveal that interfacial electronic coupling between crystalline Mo–Ni 3 S 2 and amorphous CoNiFe promotes surface reconstruction into high-valence (Ni, Co, Fe)–OOH species, while the residual sulfide interlayer provides conductive and mechanically robust support. These results demonstrate the potential of CoNiFe@Mo–Ni 3 S 2 for coupling hydrogen production with CGW treatment and resource utilization.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jie Zhu,Qixing Du,Muhammad Arif Khan,Hongbin Zhao,Jianhui Fang,Daixin Ye,Jiujun Zhang
A significant issue in the overall water splitting process is the development of bifunctional non-precious metal catalysts with high performance. Herein, we designed and synthesized heterogeneous structure of Co 5.47 N/MoN (Co-Mo-N) porous nanosheets in situ grown on nickel foam substrates by thermal ammonolysis of CoMoO 4 precursors. The special heterogeneous and porous nanosheet structure of Co-Mo-N not only provides abundance of active sites, but also accelerates the charge transfer due to the interaction between Co 5.47 N and MoN. Additionally, the differing energy band configurations of the various phases in heterostructure will cause charge transport at the interface, which would be advantageous for the surface electron modification of heterojunctions and further enhances the electrocatalytic performance. As a result, the Co-Mo-N heterostructure exhibited excellent OER and HER catalytic activity, with over potentials of 288 and 82 mV at 10 mA cm −2 , respectively. When using Co-Mo-N heterostructures as cathodes and anodes to achieve overall water splitting, a low voltage of 1.59 V is required to achieve a current density of 10 mA cm −2 . This research presents a novel approach to designing bifunctional non-precious metal catalysts for overall water splitting.
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SOLID STATE SCIENCES
·
2023
·
IF 3.5
Tao Li,Chen Wu,Na Pan,Qianying Hua,Aokui Sun
Molybdenum-copper composites have attracted increasing attention due to their excellent properties in terms of electrical conductivity , thermal conductivity and mechanical property, which are closely related to the density and composition of the sintered material. However, high temperatures are required to obtain high sintering density, resulting in loss of copper in most cases. In this work, a novel core-shell Mo–Cu composite powder was prepared by a ball-milling method followed by hydrogen reduction. The phase compositions and microstructure of prepared powders were studied by XRD , TEM and EDS , and the formation process of core-shell structure of Mo–Cu powders was discussed in detail. It was shown that the significant difference in reduction temperatures between molybdenum and copper oxides contributes to the formation of core-shell structure.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zheng-Xue Wu,Le-Qing Fan,Jiao-Juan Chen,Xu-Geng Deng,Tao Tang,Yun-Fang Huang,Ji-Huai Wu
Ternary metal sulfides employed in supercapacitors exhibit better electrochemical performances than their counterpart oxides due to their superior conductivity. However, the insertion/extraction of electrolyte ions can lead to a significant volume change in electrode materials , which can result in poor cycling stability. Herein, novel amorphous Co-Mo-S nanospheres were fabricated through a facile room-temperature vulcanization method. It involves the conversion of crystalline CoMoO 4 by reacting it with Na 2 S at room temperature . In addition to the conversion of the crystalline state into an amorphous structure with more grain boundaries, which is beneficial for the transport of electron/ion and can accommodate the volume change generated by the insertion/extraction of electrolyte ions, the production of more pores led to an increased specific surface area. The electrochemical results indicate that the as-prepared amorphous Co-Mo-S nanospheres had a specific capacitance of up to 2049.7F/g@1 A/g together with good rate capability. The amorphous Co-Mo-S nanospheres can be used as the cathode of supercapacitors and assembled with an activated carbon anode into an asymmetric supercapacitor possessing a satisfactory energy density of 47.6 Wh kg −1 @1012.9 W kg −1 . One of the prominent features exhibited by this asymmetric device is its remarkable cyclic stability, with a capacitance retention of 107% after 10,000 cycles.
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PubMed
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ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
·
2022
·Vol. 648
·期 14
·e202200132
·
IF 1.414
Rui Pei,Xinguo Ma,Changcun Han,Zhifeng Liu,Zhengwang Cheng,Xiaoru Dong
Reducing the phase transition temperature ( T c ) of VO 2 films to achieve the application in the field of Smart Home is still a challenge. Thus, in the work, the ultra-thin VO 2 films with different Mo doping amounts were successfully prepared by an economic sol-gel method and atmosphere annealing, aiming to further investigate the mechanism of the decrease of T c . The results show that the VO 2 films with 3 at % Mo doping possess the T c of 29.5 °C. Notedly, in the as-prepared films, the maximum transmittance in the visible region ( T vis ) is 46.3 % and the solar direct transmittance ( T sol ) is 45.8 %. According to the XPS spectra, it is confirmed that the Mo doping prominently induces the valence change of V ions from +4 to +3, inhibiting the strain in the phase transition process of VO 2 films, and leading to the decrease of T c . Our work will provide a feasible solution for reducing the T c of the ultra-thin VO 2 films.
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SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Jian Zhang,Hongxing Lu,Peng He,Zijie Ren,Guofang Shen,Ruxia Liu,Lei Wang,Guoqiang Luo
This study presents a facile electrodeposition and annealing procedure for the fabrication of Ni-Mo-Cu catalysts for hydrogen evolution reaction . Cu addition augmented the surface area and conductivity, while the synergistic effect of the three elements enhanced the intrinsic catalytic activity. After annealing in a vacuum at 300 °C, a dense Cu-Ni solid solution was formed on the catalyst surface, which improved the distribution of components and led to a significant improvement in corrosion resistance . Compared to the directly deposited Ni-Mo catalyst, the annealed Ni-Mo-Cu catalyst exhibited a reduced overpotential of 143 mV to generate a current density of 10 mA cm −2 in 1 M KOH at 25 °C, and its corrosion current density diminished from 0.21 to 0.035 mA cm −2 in 0.5 M NaCl at 25 °C.
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MINERALS ENGINEERING
·
2021
·
IF 4.765
Hai Yan,Bingqiao Yang,Huanyu Zhu,Pengliang Huang,Yangjia Hu
A small non-toxic compound dithiothreitol (DTT) was introduced as an environmental-friendly chalcopyrite depressant in Cu-Mo flotation separation. The separation performances were studied via flotation tests. The adsorption mechanism was explored by contact angle, Zeta potential and X-ray photoelectron spectroscopy (XPS) measurements. The flotation results manifested that DTT exhibited strong depression ability on chalcopyrite, but barely influenced the floatability of molybdenite. The contact angle and Zeta potential measurements indicated that DTT mainly adsorbed on chalcopyrite and rendered its surface hydrophilic, while it hardly adsorbed on molybdenite. XPS analysis confirmed that DTT might complex with Cu atoms on chalcopyrite surfaces via the thiol groups. This study demonstrated that DTT was a promising alternative for Na 2 S in Cu-Mo separation, which was more effective and environmentally compatible.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 6
·2860-2867
·
IF 3.502
Da-Wang Tan,Zhen-Yong Lao,Zhan Zhang,Wei-Ming Guo,Shi-Kuan Sun,Hua-Tay Lin
B 4 C-TiB 2 ceramics (TiB 2 ranging 5~70 vol%) with Mo-Co-WC as the sintering additive were prepared by spark plasma sintering. In comparison with B 4 C-TiB 2 without additive, the enhanced densification was evident in the sintered specimen with Mo-Co-WC additive. Core-rim structured grain was observed around TiB 2 grains. The interface of the rim between TiB 2 and B 4 C phases demonstrated different feature: the inner borderline of the rim exhibited a smooth feature, whereas a sharp curved grain boundary was observed between the rim and the B 4 C grain. The formation mechanism is discussed: the epitaxial growth of (Ti,Mo,W)B 2 rim around the TiB 2 core may occur as a result of the solid solution and dissolution-precipitation between TiB 2 phase and the sintering additive. It was revealed that the fracture toughness increased as the content of TiB 2 content increased, alongside the decreased hardness. B 4 C-30 vol% TiB 2 specimen demonstrated the optimal combination of mechanical properties, reaching Vickers hardness of 24.3 GPa and fracture toughness of 3.33 MPa·m 1/2 .
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CHEMOSPHERE
·
2020
·
IF 5.778
Jianjun Lian,Heli Wang,Hongping He,Weilin Huang,Mei Yang,Yin Zhong,Ping’an Peng
Iron sulfide (FeS) is an important scavenger for hexavalent molybdate (Mo(VI)) in an anoxic environment; it plays a crucial role in the mobilization and transformation of Mo(VI), although the underlying reaction mechanisms between Mo(VI) and FeS remain unclear. This study investigates the Mo(VI) reaction kinetics with the amorphous FeS over a pH range 5.0–9.0 and Mo’s chemical form on the FeS surface. It is found that the Mo(VI) reaction kinetics with FeS follow a pseudo first-order model, and the reaction rate constant ( k obs ) increases with a decrease in the pH value. The k obs at pH 5.0 is 0.027 min −1 , which is about 38 times higher than that at pH 9.0. The rapid Mo(VI) removal under acidic conditions is due to quick Mo(VI) transformation into stable MoS 2 and thiomolybdate (Mo V O x S y ). The amount of MoS 2 formed on the surface of FeS increases with a decrease in the pH value. Under neutral and alkaline conditions, Mo(VI) is not transformed into MoS 2 by FeS because the precipitation of iron oxy-hydroxide passivates the active sites of FeS. The study also investigates the effect of the initial dosage of FeS (20–200 mg L −1 ) and Mo(VI) (10–50 mg L −1 ) on the reaction kinetics of Mo(VI) with FeS. The results provides important information on the environmental fate of Mo(VI) in the anoxic environment containing amorphous FeS.
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