INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Xuelei Feng,Jianguang Yuan,Yujie Lv,Bogu Liu,Haixiang Huang,Bao Zhang,Youhua Yan,Shumin Han,Ying Wu
Magnesium borohydride (Mg(BH 4 ) 2 ) is an attractive materials for solid-state hydrogen storage due to its high hydrogen content (14.9 wt%). In the present work, the dehydrogenation performance of Mg(BH 4 ) 2 by adding different amounts (10, 20, 40, 60 wt%) of two-dimensional layered Ti 3 C 2 MXene is studied. The Mg(BH 4 ) 2 -40 wt% Ti 3 C 2 composite releases 7.5 wt% hydrogen at 260 °C, whereas the pristine Mg(BH 4 ) 2 only releases 2.9 wt% hydrogen under identical conditions, and the onset desorption temperature decreases from 210 °C to a relative lower temperature of 82 °C. The special layered structure of Ti 3 C 2 MXene and fluorine plays an important role in dehydrogenation process especially at temperatures below 200 °C. The main dehydrogenation reaction is divided into two steps, and activation energy of the Mg(BH 4 ) 2 -40 wt% Ti 3 C 2 composite is 151.3 kJ mol −1 and 178.0 kJ mol −1 , respectively, which is much lower than that of pure Mg(BH 4 ) 2 .
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
Advanced Materials Interfaces
·
2020
·Vol. 8
·期 1
·2001606
·
IF 4.948
Zuohao Wen,Yujie Ke,Chengchen Feng,Shuliang Fang,Miuyang Sun,Xinghai Liu,Yi Long
The VO 2 -based smart windows can dynamically and reversibly adjust the indoor solar irradiation to reduce the energy consumption for building glasses. This paper reports the first successful preparation of Mg-doped VO 2 @ZrO 2 core−shell nanocrystals with promoted thermochromic performance as well as tunable appearance and wettability. The achieved combination of T lum of 52.4% and ∆ T sol of 7.1% is comparable to the best-reported results of VO 2 -based core−shell rod structures. The thickness of ZrO 2 shell is tunable between 3 and 14 nm, resulting in a slightly hydrophobic surface and a slight color change toward blue-green and brighter produced films. The preparation method based on hydrothermal and UV-curing methods is facile. This work may inspire future development of VO 2 synthesis, their structure−property, and the application the thermochromic films for energy-saving purposes in buildings or automobiles.
研究领域:
材料科学
·
能源技术
·
纳米技术
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jing Zhang,Wenyu Xie,Shasha Chu,Zhangbin Liu,Zhen Wu,Yingying Lan,Vladimir V. Galvita,Lijuan Zhang,Xintai Su
Chromium ore processing residue (COPR) is a hazardous waste generated during the production of chromate. Currently, approximately 10% of Cr 2 O 3 cannot be extracted after chromite sodium roasting and remains in COPR, wasting valuable Cr resources. In this study, Mg was selectively removed by using (NH 4 ) 2 SO 4 roasting in combination with H 2 SO 4 leaching. The results showed that the selective removal of 79.55% Mg from COPR could be achieved under the optimum (NH 4 ) 2 SO 4 roasting conditions (80 mmol (NH 4 ) 2 SO 4 , 800 °C, 2 h). During the subsequent sodium roasting and acid leaching stages, the Cr extraction rate was 84.63% for the COPR direct roasting and 95.39% for the Mg removal residue roasting. The increased Cr extraction efficiency is attributed to the transformation of Mg-rich spinel and diopside (the Mg & Cr coexisting phases) in COPR converted into easily extractable (Fe,Cr) 2 O 3 and Cr 2 O 3 after the Mg treatment. This study investigated that the phase transformation of the Cr host phases is crucial for the sufficient extraction of Cr and provides inspiration for the development of efficient and practical Cr extraction techniques. Moreover, the method can be extended to the effective extraction of Cr from other Cr-containing wastes.
研究领域:
冶金工程
·
环境科学
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DOI
PubMed
高影响因子
SCANNING
·
2020
·
IF 1.33
Lin Sun,Bing Cheng Zhao,Teng Wang,Jia Yi Cui,ShuXin Zhang,Feng Li,Qianqian Zhang,HongXin Cai,Heng Bo Jiang,Eui-Seok Lee
The application prospect of biodegradable materials is being studied extensively. However, the high corrosion rate and its alloys in body fluids have been major limitations of the application of pure Mg (magnesium). To improve corrosion resistance of biodegradable AZ31 Mg alloy, we adopted microarc fluorination within a voltage range of 100-300 V in 46% hydrofluoric acid. To obtain morphologies, chemical compositions, and structural characteristics, field-emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD) were performed, respectively. Results showed that the coating was mainly composed of MgF2. Electrochemical corrosion and immersion tests proved that the corrosion resistance of MAF-treated AZ31 Mg alloy was significantly improved compared with untreated AZ31 Mg alloy in HBSS (Hank’s Balanced Salt Solution). Current densities of AZ31, MAF100, MAF150, MAF200, MAF250, and MAF300 were 342.4, 0.295, 0.228, 0.177, 0.199, and 0.212 μA/cm2, respectively. The roughness test indicated that samples under MAF treatment of 200 V, 250 V, and 300 V had large surface roughness. Meanwhile, the contact angle measurement and surface free energy test suggested that those samples had smaller contact angle and higher SFE than Ti. Thus, MAF-treated AZ31 Mg alloy might have promising application in various fields.
研究领域:
材料科学
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生物医学工程
·
腐蚀科学
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Xie Tao,Jian Yuxuan,Wang Chuang,Pan Qingrui,Yang Lingzhuo,Long Jinxiang,Yang Fenglin,Wu Xianwen,Wu Xianming
LiMn x Fe 1 − x PO 4 (LMFP) is a promising cathode candidate due to its high working voltage, cost-effective advantages, and environmentally friendly characteristics. However, LMFP is constrained by issues such as low intrinsic electronic and ionic conductivity, as well as Jahn–Teller lattice distortion induced by Mn 3+ , which limit its practical performance. To synergistically optimize its electrochemical behavior, LiMn 0.6 − x − y Fe 0.4 Mg x Zn y PO 4 (x = 0, y = 0; x = 0.005, y = 0.005; x = 0.01, y = 0; x = 0, y = 0.01) composite materials were designed and synthesized via a solvothermal method in this study. A comparative investigation of these samples was conducted to systematically elucidate the mechanisms underlying individual Mg and Zn doping and their synergistic co-doping. The experimental results indicate that the synergistic strategy of Mg and Zn dual-doping combined with carbon coating helps stabilize the olivine structure of LMFP, improves the reaction kinetics, and lowers the Li + diffusion energy barrier. The optimized LMFP/C-MgZn1 exhibits enhanced electrochemical performance, retaining 92.42% of its capacity after 600 cycles at 1.0 C and delivering a discharge specific capacity of 109.8 mAh g −1 at 10.0 C. Furthermore, Density Functional Theory (DFT) calculations indicate that the co-doping strategy improves the reaction kinetics by reducing both the material’s band gap and the Li + diffusion energy barrier. Graphical abstract Mg Zn co doping stabilizes LMFP/C, reduces the Li diffusion barrier and band gap,and enables fast kinetics with durable cycling. The alternative text for this image may have been generated using AI.
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高影响因子
RARE METALS
·
2014
·Vol. 33
·期 1
·86-90
·
IF 0.806
Zhu Xi-Lin,Han Shu-Min,Zhao Xin,Li Yuan,Liu Bao-Zhong
Hydrogen storage properties of 2LiNH 2 –MgH 2 – x NbH ( x = 0 and 0.05) composites and the catalysis of NbH on hydrogen sorption reaction of the Li–Mg–N–H system were investigated. Hydrogen sorption properties of 2LiNH 2 –MgH 2 system are effectively improved by adding NbH. Temperature programmed desorption results show the addition of NbH reduces the dehydriding onset temperature of 2LiNH 2 –MgH 2 system by 21 K. Approximate 3.62 wt% hydrogen in 2LiNH 2 –MgH 2 –0.05NbH composite is released following a 500 min at 433 K, whereas the amount of hydrogen desorption is only ~3.16 wt% for the pristine system under the same condition. The sample with NbH exhibits higher dehydriding rate compared with the pristine one. Moreover, hydrogen absorption rate increases by adding NbH into the 2LiNH 2 –MgH 2 system. Hydrogen absorption capacity of the samples with NbH is 3.23 wt% within 400 min, which is higher than that of pristine sample. Fine NbH particles homogeneously distribute in the 2LiNH 2 –MgH 2 –0.05NbH composite, and catalyze the hydrogen sorption reaction rather than reacts as a reactant into new compound.
研究领域:
材料科学
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氢能
·
固态化学
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xingxing Zhang,Xiangdong Gao,Yubing Dong,Yongqing Wu,Deng Duan,Xiang Zhao,Xiaomin Li
SiO 2 is the hotspot radiative cooling material due to its selective radiation or the Mie resonance effect generated by micro/nanospheres of a specific size. Herein, we demonstrate the modulation of the infrared emissivity of the intrinsic SiO 2 at the atmospheric window by doping Mg 2+ in nanoporous SiO 2 nanoparticles via a modified stöber method. The effects of the Mg-doping on the crystallinity, morphology, infrared emissivity of the nanoparticles and the radiative cooling properties of the corresponding coatings are investigated. Results show that the Mg-doping at a level of 0.226–2.26 % can induce cristobalite nanocrystals after sintering at 1000 ℃, transform the morphology from spheres to irregular nanoporous particles, and improve the infrared emissivity up to 0.96. XPS proves the formation of Mg-O bonds and the change of the binding energy of Si 2p and O 1s, supporting the successful doping of Mg 2+ in the lattice of SiO 2 . All-inorganic Mg-doped SiO 2 coatings on FTO substrates are prepared via tape casting , which exhibit rough and porous microstructure and high solar reflectivity up to ∼86 %, with the thickness of ∼90 µm. The Mg-doping improves the radiative cooling capacity of the coatings obviously, and the best temperature reduction of 17.8 ℃ compared with the empty space is achieved, 3–5 ℃ lower than the pure SiO 2 coating and 4.5 ℃ lower than the commercial SiO 2 coating. Our work offers an effective way to modulate the infrared emission of emitter, enriching the technical measures to improve the overall performance of the sub-ambient radiative cooling devices.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zuizhi Lu,Hua Fan,Yingjun Ou,Mianhong Chen,Ye Yang,Linawa Shen,Liya Zhou,Xiaotong He,Jiansheng Zhao,Peican Chen
Recently, near-infrared (NIR) light-emitting diodes (LED) have attracted much research attention globally. To advance this technology, NIR phosphors with high efficiency, thermal stability, and broad bands are required. In this work, we modified ZnGa 2 O4:Cr 3+ phosphor with Mg 2+ ions. Results show that this method improves the luminescence intensity of ZnGa 2 O4:Cr 3+ phosphor, and the emission wavelength of the sample can be changed by doping different Mg 2+ concentrations. This method also improved the thermal stability of the samples. The quantum yield of Mg-modified ZnGa 2 O 4 :Cr 3+ phosphors reached 87.12%, and the white LED fabricated with Zn 0.4 Mg 0.6 Ga 2 O 4 :0.01Cr 3+ phosphor and commercial Y 3 Al 5 O 12 :Ce 3+ phosphor demonstrated good performance. The NIR-LED fabricated with Zn 0.4 Mg 0.6 Ga 2 O 4 :0.01Cr 3+ phosphor achieved a photoelectric conversion efficiency of 7.17%. The lines on the surface of an orange taken by a NIR camera reveal that phosphor can be used in night vision lighting. Meanwhile, the distribution of blood vessels in the human palm highlights the promising biological applications of the Zn 0.4 Mg 0.6 Ga 2 O 4 :0.01Cr 3+ phosphor.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 26
·20981-20991
·
IF 2.779
Yan Gui-wei,Liu Qing-qing,Fang Bi-jun,Chen Zhi-hui
Mg doped (Ba 0.98 Li 0.02 )TiO 3 energy storage ceramics with antiferroelectric-like double hysteresis loops were prepared using solid-state reaction method. XRD patterns indicated that tetragonal phase structure of the pure (Ba 0.98 Li 0.02 )TiO 3 ceramic was destroyed and the orthorhombic phase structure appeared with Mg doping. The ratio of orthorhombic/tetragonal phase increased with Mg content increasing, and the value of polarization was in direct proportion to the ratio of orthorhombic/tetragonal phase. The breakdown strength of (Ba 0.98 Li 0.02 )(Mg x Ti 1− x )O 3 ceramics was improved from 60.97 kV/cm at x = 0 to 103.66 kV/cm at x = 0.04. The optimum energy storage properties of (Ba 0.98 Li 0.02 )(Mg x Ti 1− x )O 3 ceramics were obtained with energy storage density of 0.76 J/cm 3 at 102.5 kV/cm when x = 0.04, which is nearly 2.3 times larger than the pure (Ba 0.98 Li 0.02 )TiO 3 ceramic, and the energy storage efficiency was improved from 64 to 87%.
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Xiongjian Chen,Yanchao Jin,Zijing Zhou,Peiwen Huang,Xiao Chen,Rui Ding,Riyao Chen
Aquaculture wastewater contained large amounts of pathogenic microorganisms , nitrogen (N) and phosphorus (P). In this study, the nutrient recoveries and wastewater disinfection were simultaneously achieved using Mg–coconut shell carbon (Mg–CSC). The composites were prepared by a ball milling method. The hydrogen peroxide (H 2 O 2 ) was in-situ generated by the dissolved oxygen reduction driven by Mg corrosion on the CSC surface, which inactivated the microorganisms . Besides that, Mg corrosion provided sufficient Mg ions and appropriate pH conditions for struvite formation. The results show that 5.4-log E.coli removal was achieved under different conditions. Improving the Mg/CSC ratio and composite dosage could shorten the time required for disinfection. In addition to H 2 O 2 , singlet oxygen played a critical role. Reactive oxygen species destroyed the cellular structure and killed the bacteria. The recoveries of NH 4 + - N and P under certain conditions were about 60% and 91%, respectively. An increased composite dosage could improve the recovery ratio of P. Excessive dosages were not beneficial for removing NH 4 + - N . The characterization result revealed that struvite crystals were the main precipitates on the CSC surface. The Mg–CSC composites also revealed satisfied nutrient recovery and disinfection performances in the real aquaculture wastewater treatment process .
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Chun-Ping Li,Ya-Qi Wu,Fei-Yang Zhang,Li-Xin Gao,Da-Quan Zhang,Zhong-Xun An
Carbon materials with suitable pore size distribution, high specific surface area and good wettability are crucial for the capacitive deionization (CDI) electrode. Herein, the Mg-MOF-74 derived carbon (MMCK) is prepared by solvothermal synthesis, carbonization, and potassium hydroxide (KOH) activation method. The MMCK has super hydrophilicity and rich hierarchical porous structure composed of micropores, mesopores and macropores. The capacitive deionization of MMCK is investigated in NaCl aqueous solution. The MMCK has high oxygen doping amount, and has a high electrosorption capacity (16.82 mg·g −1 ) for 500 mg·L −1 NaCl. This indicates that MMCK is novel and potential material for capacitive deionization.
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产品关联
DOI
高影响因子
Journal of Magnesium and Alloys
·
2021
·
IF 10.088
Bogu Liu,Bao Zhang,Haixiang Huang,Xiaohong Chen,Yujie Lv,Zhongyu Li,Jianguang Yuan,Ying Wu
Ni and carbon materials exhibit remarkable catalysis for the hydriding reaction of Mg. But the underlying mechanism of Ni/C hybrid catalysis is still unclear. In this work, density functional theory (DFT) calculation is applied to investigate the effect of Ni/C co-incorporation on the hydriding reaction of Mg crystal. The morphology and crystal structure of the Ni/C co-incorporated Mg sample show that the co-incorporated structure is credible. The transition state searching calculation suggests that both the incorporations of Ni and C are beneficial for the H 2 dissociation. But Ni atom has a dramatic improvement for H 2 dissociation and makes the H diffusion become limiting step of the hyriding reaction. The Ni d z 2 orbit and H s orbit accept the electrons and combine together compactly, while the Ni d xy orbit is half-occupied. The catalytic effect of Ni on H 2 dissociation can be ascribed to the bridging effect of Ni d xy orbit. The incorporation of C can weaken the over-strong interaction between Ni and H which hindered the H diffusion on Mg(0001). The Ni/C co-incorporated Mg(0001) shows the best performance during hyriding reaction compared with the clean and single incorporated Mg(0001).
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