POWDER TECHNOLOGY
·
2017
·
IF 2.942
Yuanbo Zhang,Zijian Su,Bingbing Liu,Jun Chen,Guanghui Li,Tao Jiang
An investigation on the behavior of SnO 2 in the tin-bearing iron concentrates during the reduction sintering process (RSP) has been conducted by the authors' group. It was found that only about 30 wt.% of tin was removed under the optimal conditions. However, the underlying reason why it was so difficult to remove tin by the RSP was not understood. In this study, the phase evolution of tin oxide, iron oxide and calcium oxide under simulative sintering conditions was investigated by varying the gas compositions , sintering temperature and basicity (CaO/SiO 2 ). The results indicated that the Ca-Sn oxides were prior formed at 900 °C–1000 °C in the reduction atmosphere with CO / (CO + CO 2 ) = 10–40 vol.%, while the phases of Fe-Sn spinel (Fe 3 − x Sn x O 4 ) and Ca-Fe-Sn oxides were easily generated as the temperature increased to 1100 °C–1200 °C. The phases of Fe 2 − 4x/3 Sn x O 3 and Ca-Fe-Sn-Si oxides began to generate at 1100 °C in an oxidative atmosphere with O 2 /(O 2 + CO 2 ) = 25–100 vol.%. In addition, increasing alkalinity accelerated the formation of Ca-Sn oxides under reduction atmosphere, which brought about an adverse effect on the tin removal in the sintering process.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Hao Zhou,MengYao Ge,Shiguo Wu,Bichao Ye,Yaxin Su
The selective catalytic reduction of NO with propane has been investigated with iron based monolithic catalysts supported on alumina, silica, and titania. The catalysts were characterized by N 2 -physisorption, XRD, SEM, XPS, H 2 -TPR, Py-FTIR and in situ DRIFTS technologies. The different supports had a significant influence on specific surface area, surface morphology, lattice oxygen, redox properties and the acid sites, which resulted in differences in the catalytic activity of NO reduction. The C 3 H 8 -SCR performance decreased in the order as Fe/Al 2 O 3 /CM > Fe/SiO 2 /CM > Fe/TiO 2 /CM. Fe/Al 2 O 3 /CM showed the highest activity with a nitrogen oxide conversion of 100% in the presence of oxygen at 500 °C,which is mainly attributed to the good redox properties and the abundant Lewis acid sites. Based on in situ DRIFT studies, the increase of Lewis acid sites will enhance the formation of NO 2 /NO 3 − species and acetate/formate species, then promote the catalytic activity.
研究领域:
催化化学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Jing Wang,Feng Zheng,Yi Yu,Pengfei Hu,Mingjun Li,Jiao Wang,Jifang Fu,Qiang Zhen,Sajid Bashir,Jingbo Louise Liu
Supercapacitors with improved specific capacitance , long cycling life, high power density and energy density are fabricated to close the gap between traditional and emerging energy storage. We develop interactive ternary metal oxides nano-ribbon electrodes used to assemble symmetric supercapacitor. The well-aligned vanadium oxide ribbon arrays act as the matrix, growing from nickel oxide/nickel substrate and then being grafted by manganese oxide nanoparticles. These tri-metallic oxides are formed in a cost-effective and green hydrothermal chemistry. The electrodes composed of ribbon arrays retain their crystallographic structure during charging and discharging processes, enabling steadiness at 83.6 % after 10,000 cycles. These as-prepared electrodes demonstrate a specific capacitance of 788 F g −1 at 5 mV s −1 . The symmetrical supercapacitors are assembled using triple component electrodes, achieving a high energy density of 138 W h kg −1 at a power density of 450 W kg −1 . These binderless single-cell devices are reported with a simplified design showing 10–20 times higher energy density in comparison with reported results of the V 2 O 5 -MnO 2 system. The nanografting results in reactive interfaces with interpenetrating channels for efficient ion transport and electron conduction. The advances to design nanostructured supercapacitor materials are based on these heterojunction arrays to enhance their supercapacitive performances.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jingwei Zhang,Yihuan Wang,Zhimin Chai,Dewen Zhao,Xinchun Lu
Introducing moisture or water vapor into the annealing process has been proven to enhance the electrical performance of solution-processed metal oxide films. However, there remains a lack of understanding regarding the selection of appropriate pre- and post-annealing relative humidities (RHs). Here, a controlled humidity annealing process is presented to explore the impact of pre- and post-annealing RH on the electrical performance of solution-processed metal oxides. The results indicate that both high RH pre-annealing and high RH post-annealing favor the formation of metal-oxygen-metal bonding states and improve the crystallization of the metal oxide films, leading to an optimized electron percolation path for the indium oxide (In 2 O 3 ) semiconductor channel, decreased leakage current for the aluminum oxide (Al 2 O 3 ) dielectric, and reduced resistivity for the indium tin oxide (ITO) electrodes. All-solution-processed thin film transistors (TFTs) are fabricated utilizing In 2 O 3 as semiconducting channel layers, ITO as source/drain and gate electrodes, and Al 2 O 3 as gate dielectrics. A six-fold improvement in mobility is achieved when increasing the pre- and post-annealing RH from 10% to 70%, attributed to improved electron percolation path, reduced contact resistance, and fewer electron trap sites. Moreover, the TFTs demonstrate outstanding environmental and electrical stabilities and high reproducibility, as evidenced by the minimal threshold voltage shifts observed during stability tests and the small standard deviations of the device parameters.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 26
·11823-11830
·
IF 3.591
Ming Li,Yufei Hu,Gongke Li
In this work, FeNi layered double hydroxides/graphene oxide (FeNi LDH/GO) was prepared, which exhibits excellent selective cataluminescent performance towards propylene oxide. The selectivity and sensitivity of the cataluminescence (CTL) reaction were investigated in detail. Moreover, the catalytic reaction mechanism, including the intermediate products and the conversion of reactants to products, was discussed based on both the experimental and computational results. Furthermore, the proposed FeNi LDH/GO based CTL sensor was successfully applied for the determination of propylene oxide residue in fumigated raisins, which indicates extensive application potential for rapid food safety evaluation.
研究领域:
食品科学
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分析化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Kunlun Yang,Jiasheng Zhou,Zimo Lou,Xurui Zhou,Yuanli Liu,Yizhou Li,Shams Ali Baig,Xinhua Xu
Fe-Mn binary oxides (FMBO) with different Fe/Mn molar ratios were synthesized to investigate the influence of the changed iron oxides forms and the manganese oxide on the removal efficacy of Sb(V) from water under neutral pH. The characterization tests by electron microscopy and X-ray diffraction spectroscopy showed that FMBO gradually changed from granular to aciculiform or fibrous structure and their crystalline degree increased with the decreasing Mn content. The ferric oxides in FMBO transformed from 2-L ferrihydrite-like substance with amorphous state to goethite or lepidocrocite with high crystalline as the amount of added Mn reduced during the preparation. The Sb(V) adsorption rates and capacities of FMBO both decreased and the influence of pH on the Sb(V) removal became greater with the decreasing Mn oxide content. All the results indicated that the addition of Mn could greatly improve the Sb(V) removal performance of FMBO through promoting the formation and preventing the transformation of amorphous ferric oxide in FMBO during the preparation, whose Sb(V) adsorption ability was confirmed to be stronger than that of goethite or lepidocrocite. Further exploration indicated the complexation reaction between Sb(V) and amorphous ferric oxide played a key role in Sb(V) adsorption by FMBO. Meanwhile, FMBO with a Fe/Mn molar ratio of 3:1 (FMBO 3 ) exhibited excellent regeneration performance and the amorphous iron oxide in FMBO 3 gradually transformed into crystalline iron oxide during the consecutive recycling.
研究领域:
环境科学
·
水处理
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Earth and Space Chemistry
·
2023
·
IF 3.4
Hao Tian,Xue-Bin Zhang,Yin-Ping Li,Qing He,Na-Na Tian,Song-Hai Wu,Xu Han
Although inorganic Fe(IV)═O oxo and Fe(III)-OOH peroxo have attracted more attention in aqueous environments, direct evidence for the characterization and identification of those oxidizing species is still lacking. In this study, the doped Cu/Co increases the reactivity of ferrihydrite/hematite in oxidizing As(III) by S(IV)-O2 under alkaline and dark conditions. Quenching experiments exclude the contributions of ·OH, O2•–, SO3•–, SO4•–, SO5•–, HSO5–, and H2O2 and confirm that peroxo and oxo are primary oxidizing species in As(III) oxidation. Electrochemical analyses indicate that Fe(IV)═O oxo and Fe(III)-OOH peroxo are primarily located on the surface of ferrihydrite and hematite. Selective oxidation of methyl phenyl sulfoxide and methyl phenyl sulfide to the corresponding oxidation products further reveals the presence of ≡Fe(IV)═O oxo on both ferrihydrite and hematite, and the doped Cu/Co significantly decreases the produced ≡Fe(IV)═O oxo on ferrihydrite, while increases the produced ≡Fe(IV)═O oxo on hematite. Meanwhile, selective oxidation of benzyl alcohol to benzaldehyde indicates the presence of ≡Fe(III)-OOH peroxo on both ferrihydrite and hematite, and the doped Cu/Co apparently increases the produced ≡Fe(III)-OOH peroxo on ferrihydrite and hematite. Raman analysis further reveals the presence of ≡Fe(IV)═O oxo and ≡Fe(III)-OOH peroxo on pure and metal-doped ferrihydrite/hematite, which also confirms that the doped Cu/Co decreases the produced ≡Fe(IV)═O oxo on ferrihydrite and increases ≡Fe(IV)═O oxo on hematite, while apparently increasing ≡Fe(III)-OOH peroxo on both ferrihydrite and hematite. This study enriches our understanding on the oxidizing species in the S(IV)-mediated oxidation processes under alkaline conditions, providing new insight on the oxidation reactivity of surface peroxo and oxo species mediated by the doped metal ions.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Shouhao Tong,Hongyan Wei,Junming Zhou,Yixuan Yang,Runliang Zhu,Qingze Chen,Xiande Xie,Qing Hu,Michael F. Hochella Jr.,Jing Liu
Heterogeneous crystallization of manganese (oxyhydr)oxides (MnOx) on iron (oxyhydr)oxides (FeOx) is crucial for the biogeochemical cycling of Mn, yet atomic-level insights into this process are important but relatively limited. Herein, we revealed the distinct adsorption, oxidation, and crystallization mechanisms of Mn on hematite (Hem), ferrihydrite (Fhy), and goethite (Gth). Gth exhibited highest ability in Mn(II) removal and oxidation, followed by Hem and Fhy. Manganite and hausmannite were the main MnOx products with distinct proportions, and morphologies cross the systems. MnOx growth mechanisms involve surface-induced nucleation, crystallization by particle attachment (CPA), and self-catalyzed growth. On Fhy, self-catalyzed growth was dominant; for Gth, surface-induced nucleation was prevalent, supplemented by CPA; and Hem combined all three mechanisms. These distinct mechanisms led to nanoparticles primarily of hausmannite on Gth and nanowires of manganite and hausmannite on Hem and Fhy, with those on Hem displaying lower aspect ratios. Differences in MnOx structure and morphology were attributed to Mn(II)-FeOx complexation, FeOx electronic band structure, and crystal structure mismatch between MnOx and FeOx, which respectively influenced the direct and indirect electron transfer and heterogeneous nucleation efficiency. This work advances our understanding of MnOx crystallization on FeOx at the nanoscale, explaining the diverse morphology and structure of MnOx in different environments.
研究领域:
环境科学
·
材料科学
·
地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Gang Xing,Xuan Liu,Yazhen Jia,Jialin Wu,Liming Chai,Wenjie Zhai,Zhaojun Wu,Jing Kong,Jianbin Zhang
Synthesis of catalysts with high catalytic degradation activity for formaldehyde (HCHO) at room temperature is highly desirable for indoor air quality control. Herein, a novel K-Mn 3 O 4 @CeO 2 catalyst with excellent catalytic oxidation activity toward HCHO at near room temperature was reported. In particular, the K addition in K-Mn 3 O 4 @CeO 2 considerably enhanced the oxidation activity, and importantly, 99.3 % conversion of 10 mL of a 40 mg/L HCHO solution at 30 °C for 14 h was achieved, with simultaneous strong cycling stability. Moreover, the addition of K species considerably influenced the chemical valence state of Mn from +4 ( ε -MnO 2 ) to +8/3 (Mn 3 O 4 ) on the surface of CeO 2 , which obviously changed the tunnel structure and the number of oxygen vacancies. One part of K species is uniformly dispersed on K-Mn 3 O 4 @CeO 2 , and the other part exists in the tunnel structure of Mn 3 O 4 @CeO 2 , which is mainly used to balance the negative charge of the tunnel and prevent collapse of the structure, providing enough active sites for the catalytic oxidation of HCHO. We observed a phase transition from tunneled KMnO 2 to Mn 3 O 4 to tunneled MnO 2 with the decreasing K + content, in which K-Mn 3 O 4 @CeO 2 exhibited higher HCHO oxidation activity. In addition, K-Mn 3 O 4 @CeO 2 exhibited lower oxygen vacancy formation and HCHO adsorption energies in aqueous solution based on density functional theory calculations. This is because the K species provide more active oxygen species and richer oxygen vacancies on the surface of K-Mn 3 O 4 @CeO 2 , promote the mobility of lattice oxygen and the room-temperature reduction properties of oxygen species, and enhance the ability of the catalyst to replenish the consumed oxygen species. Finally, a possible HCHO catalytic oxidation pathway on the surface of K-Mn 3 O 4 @CeO 2 catalyst is proposed.
研究领域:
环境科学
·
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2023
·
IF 5.5
Hong Liang,Qiang Zheng,Kaibin Zhang,Youli Yang,Ran He
Mesoporous 10CeO x /MnO x -Y catalysts were successfully prepared by doping Ce and calcining Mn-BTC (BTC = 1,3,5-benzenetricarboxylate) for ozone catalytic decomposition. The 10CeO x /MnO x -300 catalyst exhibited the highest catalytic activity under the relative humidity (RH) range from less than 5–65 %, giving 100 % conversion of 40 ppm O 3 after 6 h. Series of physicochemical characterizations including XRD, TG, SEM, HR-TEM, ICP-OES, BET, XPS and H 2 -TPR were introduced the relationship of calcination temperature, catalysts structure and ozone catalytic performance. The results demonstrated that the 10CeO x /MnO x -300 catalyst had the highest Mn 3+ /Mn 4+ and O ads /O latt ratios and the largest specific surface compared with those of other samples, which are crucial to decompose ozone. In addition, better dispersion of crystals, larger pore volume, more oxygen vacancies, and better low-temperature reducibility are also conducive to ozone decomposition. This research establishes the basis for the application of manganese-based MOFs for ozone decomposition.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2019
·Vol. 6
·期 5
·1574-1581
·
IF 3.975
Pu Wang,Shuang Hou,Fang Pang,Miao Liu,Yanxin Li,Tiezhong Liu,Yizhen Luo,YaMeng Fan,Lingzhi Zhao
Graphical In the mill : Unique hierarchical mosaic-structure SiO x /C@CoO nanosheets, with both SiO x and graphite particles embedded in a CoO layered structure, are successfully fabricated through a high-energy ball-milling process and through a one-step hydrothermal process to form a 3D hierarchical mosaic structure. The unique combination of the CoO and SiO x /C can accommodate the large volume changes and retain the structural integrity of the nanosheets, maintaining the cycling stability and rate capability of SiOx/C@CoO electrode materials. Unique hierarchical mosaic-structure SiO x /C@CoO nanosheets were successfully synthesized from SiO x /C nanospheres embedded in CoO nanosheets through a high-energy ball milling and hydrothermal self-assembly process. The SiO x /C@CoO material exhibited good cyclic performance with a reversible discharge capacity of 1079 mAh g −1 over 250 cycles at a current density of 1000 mA g −1 . It also displayed an excellent rate capability (with an average specific reversible discharge capacity of 777.8 mAh g −1 at 2000 mA g −1 and 480 mAh g −1 at 5000 mA g −1 ). The stable skeleton structure of SiO x /C-embedded CoO nanosheets and the synergistic effect between the two materials should be responsible for the improvement of the lithium storage. This work proposes a feasible approach to promote CoO application in lithium-ion batteries.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2020
·
IF 2.434
Meng Chao,Lijiang Zhao,Jin Leng,Xinghua Liu,Yutong Li,Junying Zhang,Zilong Tang
Tin oxide (SnO 2 ) with high specific capacity and excellent safety performance has become potential candidate for next generation lithium-ion batteries (LIBs). However, the practical application of SnO 2 is hindered by large volume change and particle aggregation. Herein, a type of three-dimensional (3D) hierarchical porous titanium-based microclews composed of one-dimensional (1D) titanium dioxide (TiO 2 ) nanoribbons and SnO 2 nanoparicles, is synthesized for the first time with the assistance of cationic surfactant , cetyltrimethylammonium bromidewere (CTAB). SnO 2 nanoparticles distribute uniformly on the nanoribbons, and CTAB as growth controller plays a key role in the formation of the uniform and stable hierarchical-structure. The as-synthesized CTAB assisted hierarchical-structure TiO 2 @SnO 2 microclews (CA–TiO 2 @SnO 2 MCs) elelctrode demonstrates outstanding ionic conductivity due to the structure assisting efficient contact between electrode and electrolyte, with a remarkable discharge capacity of 448.3 mAh g −1 after cycling for 500 times at a current density of 500 mA g −1 , and a capacity retention of 558.8 mAh g −1 at 200 mA g −1 after 400 cycles in LIBs.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）