INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
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IF 7.2
Samuel Guemou,Fuying Wu,Pengzhou Chen,Jiaguang Zheng,Ting Bian,Danhong Shang,Alexei Pavlovich Levtsev,Liuting Zhang
Transition metal-based oxides have been proven to have a substantial catalytic influence on boosting the hydrogen sorption performance of MgH 2 . Herein, the catalytic action of Ni 6 MnO 8 @rGO nanocomposite in accelerating the hydrogen sorption properties of MgH 2 was investigated. The MgH 2 + 5 wt% Ni 6 MnO 8 @rGO composites began delivering H 2 at 218 °C, with about 2.7 wt%, 5.4 wt%, and 6.6 wt% H 2 released within 10 min at 265 °C, 275 °C, and 300 °C, respectively. For isothermal hydrogenation at 75 °C and 100 °C, the dehydrogenated MgH 2 + 5 wt% Ni 6 MnO 8 @rGO sample could absorb 1.0 wt% and 3.3 wt% H 2 in 30 min, respectively. Moreover, as compared to addition-free MgH 2 , the de/rehydrogenation activation energies for doped MgH 2 composites were lowered to 115 ± 11 kJ/mol and 38 ± 7 kJ/mol, and remarkable cyclic stability was reported after 20 cycles. Microstructure analysis revealed that the in-situ formed Mg 2 Ni/Mg 2 NiH 4 , Mn, MnO 2 , and reduced graphene oxide synergically enhanced the hydrogen de/absorption properties of the Mg/MgH 2 system.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 101
·82916-82923
·
IF 3.84
Yingying Zhu,Jianxin Zou,Xiaoqin Zeng
In the present work, two LiBH4 based hydrogen storage composites, namely, 3LiBH4/graphene and 3LiBH4/graphene–10 wt% CeF3, were prepared through ball milling and their hydrogen sorption behaviors were investigated. It was shown that the dehydrogenation kinetics of 3LiBH4/graphene was improved by doping 10 wt% CeF3, which was attributed to the formation of CeB6. The rehydrogenation of the 3LiBH4/graphene composite could be achieved under 440 °C with 3.3 MPa hydrogen pressure and the hydrogen absorption capacity reached 7.40 wt% to LiBH4 after 10 h. Further addition of CeF3 did not improve the rehydrogenation kinetics but reduced the absorption capacity. SEM observations suggested that LiBH4 was confined in a graphene wrapper after rehydrogenation, forming “graphene capsules” that helped the regeneration of LiBH4.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Darvaish Khan,Jianxin Zou,Saz Muhammad,Niaz Ali Khan,Shah Saud,Subrata Panda
In this study, a MgH 2 –Ru composite is prepared by mechanical ball milling of MgH 2 and Ru powders. The microstructural analysis revealed the uniform distribution of Ru nanoparticles in the MgH 2 matrix and the formation of intermetallic compounds (i.e. Mg 6.2 Ru and Mg 1.5 Ru) after dehydrogenation of the composite. The substantial improvements in the de/hydrogenation properties of MgH 2 are due to the adjustable catalytic role of Ru under low temperature and pressure conditions. MgH 2 –Ru composite started to release hydrogen at an onset temperature of 300 °C, much lower than the mechanically milled pure MgH 2 (350 °C). Hydrogen absorption of the MgH 2 –Ru composite is relatively fast at 350 °C and stored 6.1 wt% in 5 min. At the same temperature, the hydrogenated MgH 2 –Ru composite released all stored hydrogen in less than 5 min. Compared with the catalyst-free MgH 2 , the hydrogenation and dehydrogenation activation energies of the MgH 2 –Ru composite are reduced to 65.12 ± 2.4 kJ/mol H 2 , and 97.46 ± 4.15 kJ/mol H 2 , respectively. In addition, it further demonstrated how the reversible transformation of Mg–Ru intermetallic phases induces the thermodynamic destabilization of the MgH 2 system. The presence of Ru not only facilitated the breaking of the Mg–H bond but also provided very good catalytic interfaces for enhanced de/hydrogenation properties of MgH 2 .
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Zhichao Yu,Xin Liu,Yang Liu,Yuan Li,Zhuohan Zhang,Kangli Chen,Shumin Han
Multiple catalysts have exhibited high activity on improving the hydrogen storage performance of MgH 2 . Herein, the hydrogen ab/desorption kinetics of MgH 2 is significantly improved by using Ni@C@CeO 2 as the catalyst. The results show that 10 wt%-Ni@C@CeO 2 doped MgH 2 can absorb 4.51 wt% hydrogen within 60 min under low temperature 75 °C. Furthermore, the MgH 2 -Ni@C@CeO 2 composites release approximately 4.88 wt% H 2 within 10 min at 325 °C. Moreover, the composites show excellent cycling performance, with negligible decrease in hydrogen storage capacity, hydrogen uptake rate and hydrogen release rate after ten cycles at 350 °C. The Rietveld refinement of X-ray diffraction and transmittance electron microscopy measurements reveal that Mg 2 NiH 4 /Mg 2 Ni and CeH 2.73 phases are in-situ formed. The mutual conversion of “Mg 2 Ni/Mg 2 NiH 4 ” during hydrogen ab/desorption is a well-known “hydrogen pump” effect, which improvs the hydrogen storage performance of MgH 2 . The presence of CeH 2.73 accelerate the conversion of Mg 2 Ni/Mg 2 NiH 4 , which we call ‘facilitated hydrogen pump’ effect. This attempt paves a potential way to achieve high performance Mg-based composites hydrogen storage materials via collaborative action between Ni and Ce species.
研究领域:
材料科学
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能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhenmin Ding,Yaokun Fu,Lu Zhang,Ismael A. Rodríguez-Pérez,Hongming Zhang,Wenfeng Wang,Yuan Li,Shumin Han
Magnesium hydride (MgH 2 ) with excellent hydrogen absorption kinetics is important for the wide application of hydrogen energy. Herein, to accelerate the sorption kinetics of MgH 2 and lower its dehydrogenation temperature, we design and prepare a carbon film coated dual transition metal alloy , the Fe 0.64 Ni 0.36 @C composite with a core-shell structure, and employ it as an additive to synthesize MgH 2 –Fe 0.64 Ni 0.36 @C system by ball-milling and hydriding combustion method. In contrast to pure MgH 2 , the initial hydrogen release temperature of the MgH 2 –Fe 0.64 Ni 0.36 @C composite lowers to 250 °C from 378 °C and the composite can absorb 5.18 wt% H 2 within 20 min (150 °C, 3 MPa H 2 ). More importantly, the apparent activation energy of the dehydrogenation for decomposition of Fe 0.64 Ni 0.36 @C-doped MgH 2 reduced from 162.8 ± 8.3 kJ/mol to 86.9 ± 4.6 kJ/mol. The enhanced hydrogen sorption kinetics of MgH 2 –Fe 0.64 Ni 0.36 @C mainly attributes to the synergistic effect between the formed Fe@C and Mg 2 Ni/Mg 2 NiH 4 . Moreover, the MgH 2 co-doped with the multiple in-situ formed active particles shows excellent cycling performance, indicative of potential application in practical hydrogen storage in the near future.
研究领域:
材料科学
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能源储存与转换
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Hui Yun,Jing Bai,Zhiheng He,Huanxi Wang,Yanhong Wang,Shijie Cao,Santosh Kumar Verma,Quanquan Li
MgCo alloys are considered important hydrogen storage materials, yet it depends on the synthetic methods (alloying, nanosizing, catalyst modification, etc ) to a certain degree. Thus, investigation of the effect of synthetic conditions on the dynamics/thermodynamic properties of MgCo alloys is a crux. Herein, we fabricated Mg10Co alloy via a combination of mechanical alloying and high-temperature/pressure hydrogenation to explore the effect of alloying time on the hydrogenation and dehydrogenation performances of Mg10Co. The Mg10Co consists of Mg, Mg 2 Co, MgCo 2 , and Co phase, providing nucleation sites for heterogeneous nucleation of hydrides, and the grain refinement can increase surface defects, shorten the diffusion and transport distance of hydrogen. In addition, the ball milling time significantly affected the hydrogenation performance, and the best performance was achieved with the ball milling time being 14 h, and Mg10Co can absorb 5.93 wt% of H 2 in 5 min at 350 °C. The high hydrogen absorption rate can perhaps due to the lower absorption plateau of Mg 2 CoH 5 and Mg 6 Co 2 H 11 hydrides relative to MgH 2 . Furthermore, the dehydrogenation activation energy was 124.89 kJ/mol. This work contributes to the improvement of the kinetics properties of magnesium-based hydrogen storage alloys.
研究领域:
材料科学
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能源储存
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2021
·
IF 2.917
Yan CHEN,Hao-yu ZHANG,Fu-ying WU,Ze SUN,Jia-guang ZHENG,Liu-ting ZHANG,Li-xin CHEN
Mn nanoparticles (nano-Mn) were successfully synthesized and doped into MgH 2 to improve its de/hydrogenation properties. Compared with MgH 2 , the onset desorption temperature of 10 wt.% nano-Mn modified MgH 2 was decreased to 175 °C and 6.7, 6.5 and 6.1 wt.% hydrogen could be released within 5, 10 and 25 min at 300, 275 and 250 °C, respectively. Besides, the composite started to take up hydrogen at room temperature and absorbed 2.0 wt.% hydrogen within 30 min at low temperature of 50 °C. The hydrogenation activation energy of MgH 2 was reduced from (72.5±2.7) to (18.8±0.2) kJ/mol after doping with 10 wt.% nano-Mn. In addition, the MgH 2 + 10 wt.% nano-Mn composite exhibited superior cyclic property, maintaining 92% initial capacity after 20 cycles.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Tianping Huang,Jianxin Zou,Xiaoqin Zeng,Jie Wang,Huabing Liu,Wenjiang Ding
In the present work, NaBH 4 based hydrogen storage materials, 3NaBH 4 -(x)YF 3 -(1-x)GdF 3 composites, were prepared via mechanical ball milling with different values of x (2/3, 1/2, 1/3). The de-/rehydrogenation thermodynamic and kinetic behaviors of 3NaBH 4 -(x)YF 3 -(1-x)GdF 3 composites were systematically investigated. These composites showed a single endothermal peak of hydrogen desorption even though two metal fluorides were added simultaneously into NaBH 4 . All the 3NaBH 4 -(x)YF 3 -(1-x)GdF 3 composites showed reversible hydrogen sorption ability and the best hydrogen absorption kinetics was observed in the 3NaBH 4 -0.5YF 3 -0.5GdF 3 composite, with about 2 wt% hydrogen absorbed at 370 °C under 3.2 MPa H 2 pressure in 1 h. Its hydrogen absorption kinetic behaviors were correlated closely to a First-order reaction model based on experimental results. According to the pressure-composition-temperature (PCT) tests, the reversible hydrogen storage capacity increases, and the hydrogen desorption enthalpy decreases along with more GdF 3 addition. In particular, the desorption enthalpy with regard to the apparent Pauling's electronegativity (χ p ) of added metal cations can be described as Δ H d = −2748.21χ p +3852.99 kJ/mol H 2 , where χ p =(x)∙χ p (Y 3+ )+(1-x)∙χ p (Gd 3+ ). This research helps us to clarify the effect of co-addition of two rare earth metal fluorides on reversible hydrogen sorption in NaBH 4 .
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 22
·8557-8570
·
IF 0
Lina Chong,Jianxin Zou,Xiaoqin Zeng,Wenjiang Ding
In the present work, two new reversible hydrogen storage composites, NaBH4 + LaF3 and NaBH4 + LaH2, have been prepared through a mechanical milling method with the aim of comparatively studying the effects of La fluoride and La hydride on the hydrogen sorption behaviors of NaBH4. Experimental investigations have shown that both La fluoride and La hydride enable reversible hydrogen sorption in NaBH4. In particular, LaF3 exhibits a superior promoting effect than LaH2, which agrees well with theoretical predictions. Surprisingly, better hydrogen sorption properties can be achieved in both systems through undergoing de-/rehydriding cycles. The reversible hydrogen storage capacity reaches up to 3.0 wt% at 238 °C and 2.9 wt% at 326 °C in NaBH4 + LaF3 and NaBH4 + LaH2 systems after the 6th dehydrogenation, respectively. In both cases, the formation of La boride plays the major role in the reversible hydrogen sorption in NaBH4. The superior promoting effect of La fluoride than La hydride upon modifications of thermodynamics and kinetics of NaBH4 should be ascribed to the following factors: (i) the formation of a thermodynamically more stable compound NaF instead of NaH reduces the overall enthalpy changes of re/de-hydriding reactions in NaBH4 + LaF3 to −31.8 kJ mol−1 H2 and 72.5 kJ mol−1 H2, respectively; (ii) the ion exchange of F− for H− leads to the reduction of the onset dehydrogenation temperature of NaBH4 to 160 °C in the NaBH4 + LaF3 composite; (iii) the F− anion favors the formation of LaB6 while H− favors the formation of LaB4. The role of functional anions and cations, de-/rehydrogenation mechanisms and nucleation modes in the two reversible hydrogen storage composites have been proposed based on experimental and theoretical analyses. The comparison study carried out in this work helps to design and search for new metal borohydride based composites for reversible hydrogen storage.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
ENERGY & FUELS
·
2024
·
IF 5.2
Congwen Duan,Jinhui Wu,Poqian Liang,Haimei Wang,Ting Qu,Yuchen Fan,Yaohua Su,Zhaohua Su,Lianxi Hu,Ying Wu
The hydrogen storage potential and cost-effectiveness of MgH2 have rendered it a desirable material for hydrogen storage. However, its application has been hindered by limitations in thermal stability and dehydrogenation kinetics. In this study, the carbon nanotube-Pd bifunctional catalyst was prepared by using hydrothermal and calcination technology, significantly improving the kinetics of Mg/MgH2 during hydrogen adsorption/desorption. The activation energy for the Mg@ CNTs-Pd was reduced to 42.73 kJ/mol, as determined by fitting the Avrami–Erofeev model with the Arrhenius equation. Additionally, the activation energy during dehydrogenation was found to be 73.98 kJ/mol based on the Johnson–Mehl–Avrami–Kolmogorov equation and the Arrhenius equation. It is worth noting that the dynamic enhancement persists even after 10 cycles. This groundbreaking research has paved the way for potential applications of MgH2 as a hydrogen storage material, providing it with broader development opportunities.
研究领域:
材料科学
·
能源储存
✓ 已验证
产品关联
DOI
高影响因子
Journal of Magnesium and Alloys
·
2021
·
IF 10.088
Hui Yong,Xin Wei,Jifan Hu,Zeming Yuan,Shihai Guo,Dongliang Zhao,Yanghuan Zhang
The composites comprised of Co nanoparticle and C nanosheet were prepared though a high-temperature carbonization reaction. The catalysis of Co@C composites on the hydrogen storage behavior of Mg 90 Ce 5 Y 5 alloy was investigated in detail by XRD, SEM, TEM, PCI, and DSC method. Because of the synergistic catalytic function of C and Co in C@Co nanocomposites, the Mg 90 Ce 5 Y 5 alloy with 10 wt.% C@Co shows the excellent hydrogen absorption and desorption performances. Time for releasing hydrogen reduces from 150 min to 11 min with the addition of the C@Co composites at the temperature of 300 °C. Meanwhile, the dehydrogenation activation energy also declines from 130.3 to 81.9 kJ mol −1 H 2 after the addition of the C@Co composites. This positive effect attributes to the C layer with the high defect density and the Co nanoparticles, which reduces the energy barriers for the nucleation of Mg/MgH 2 phase and the recombination of hydrogen molecule. Besides, the C@Co composites also improve the activation property of the Mg 90 Ce 5 Y 5 alloy which was fully activated in the first cycle. Moreover, the temperature for initial dehydrogenation and the endothermic peak of the alloy hydride were also decreased. Although the addition of the C@Co composites increases the plateau pressures and decreases the value of the decomposition enthalpy, these differences are so small that the improvement on thermodynamics can hardly be seen.
研究领域:
材料科学
·
化学工程
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Samuel Guemou,Liuting Zhang,Shuai Li,Yiqun Jiang,Tao Zhong,Zichuan Lu,Ren Zhou,Fuying Wu,Qian Li
The design of an excellent active catalyst to improve the sluggish kinetic and thermodynamic properties of magnesium hydride (MgH 2 ) remains a great challenge to achieve its practical application. In this study, a novel Ni-Nb/rGO nanocomposite catalyst was successfully prepared by one-spot hydrothermal and subsequent calcination methods. The novel Ni-Nb/rGO nanocomposite exhibits an exceptional catalytic effect on improving MgH 2 sorption properties. Specifically, the onset desorption temperature of MgH 2 + 10 wt% Ni-Nb/rGO composite is reduced to 198 °C, much lower than that of undoped MgH 2 (330 °C). Interestingly, the composite can release 5.0, 5.9, and 6.0 wt% H 2 within 10 min at 245, 260, and 275 °C, respectively. Furthermore, the dehydrogenated MgH 2 + 10 wt% Ni-Nb/rGO composite starts to absorb hydrogen even at room temperature with approximate 2.75 wt% H 2 uptake at 75 °C under 3 MPa H 2 pressure within 30 min and exhibits excellent stability by maintaining 6.0 wt% hydrogen content after 20 cycles at 300 °C. Chou's model suggests that the de/hydrogenation kinetics of Ni-Nb/rGO-modified MgH 2 switches from surface penetration model to diffusion model at lower temperatures. Additionally, the activation energies ( E a ) for the de/hydrogenation of MgH 2 + 10 wt% Ni-Nb/rGO are reduced to 57.8 kJ/mol and 33.9 kJ/mol, which are significantly lower than those of undoped MgH 2 . The work demonstrates that the addition of a novel ternary Ni-Nb/rGO catalyst is an effective strategy to not only boost the sorption kinetics of MgH 2 but also maintain its cycling property.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）