CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Li Ren,Wen Zhu,Qiuyu Zhang,Chong Lu,Fengzhan Sun,Xi Lin,Jianxin Zou
Magnesium hydride (MgH 2 ) is one of the most promising hydrogen storage materials, while the high desorption temperature and sluggish kinetics hamper its further commercialization. Herein, a novel MOF-derived 1D N-doped hierarchically porous carbon nanofiber (pCNF) is firstly prepared and used as the scaffold for self-assembly of MgH 2 /Ni nanoparticles (NPs). The resultant MgH 2 /Ni@pCNF nanocomposites show faster desorption kinetics ( E a = 96.58 kJ/mol H 2 ), lower onset desorption temperature ( T onset = 200 °C) when compare to the commercial MgH 2 ( E a = 142.27 kJ/mol H 2 , T onset = 350 °C). Moreover, hydrogen absorption can be achieved at a temperature as low as 100 °C with a capacity of 2.2 wt% within 120 min. Additionally, the composites exhibit excellent cycling stability with a capacity retention over 95.4% after 10 complete re-/dehydriding cycles at 300 °C. In-situ HRTEM observations of the desorption process combined with XPS and XRD indicate that the synergistic effects from nanoconfinement of Mg/MgH 2 in pCNF, electron-donating ability of N atoms and the “hydrogen pump” function of Mg 2 Ni/Mg 2 NiH 4 account for the unprecedent hydrogen storage properties. The strategy of using the MOF-derived 1D pCNF as support for nanoparticles provides a new approach for fabricating nanostructured energy materials with enhanced performances.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Xiaoxia Chen,Cong Peng,Qingan Zhang
Magnesium hydride is a promising solid-state hydrogen storage material with a hydrogen capacity of 7.6 wt%. However, its practical applications are limited by high thermodynamic stability, sluggish desorption kinetics and poor cycling stability. To enhance the hydrogen desorption kinetics and cycling stability of MgH 2 , nanosized TiOF 2 and NbO 2 F are synthesized as catalytic additives in this work. After the preparation by ball milling and activation by de/hydrogenation cycling of MgH 2 –10 wt% TiOF 2 and MgH 2 –10 wt% NbO 2 F composites, the highly dispersed magnesium fluoride, magnesium-transition metal oxides and transition metal hydrides as well as multivalent transition metal species can be in-situ formed throughout the samples. Benefiting from the synergistic effect of these secondary phases, the two samples exhibit fast dehydrogenation kinetics with activation energies of 76.2 and 74.4 kJ mol −1 , respectively. It is noteworthy that the microstructure configurations can be preserved well after 50 cycles. Consequently, the dehydrogenation activation energies of the cycled samples only increase to 80.5 and 78.7 kJ mol −1 , respectively, showing good cycling stability. These results demonstrate that multivalent transition metal oxyfluorides can be used as efficient additives to improve hydrogen storage properties of MgH 2 .
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chenjie Dong,Guansheng Li,Jiajing Zhu,Jie Cui,Liangjun Huang,Hui Wang
MgH 2 is a high-density hydrogen storage material but requires an efficient catalyst to improve its poor kinetics and reduce high operating temperature. TiO 2 is a widely used photocatalyst for water splitting and hydrogen production, and has also demonstrated catalytic ability in the gas-solid reaction of MgH 2 . In this study, we synthesize the Ni-doped TiO 2 nanoparticles, which significantly reduce the hydrogen absorption temperature down to subzero temperatures. The milled composite of MgH 2 with 10 wt% Ti(5Ni)O 2 can absorb 5.25 wt% H 2 within 30 s at 25 °C, 4.30 wt% H 2 within 50 s at 0 °C, and 3.94 wt% H 2 within 50 s even at a low temperature of −30 °C. This composite can release 6.04 wt% of hydrogen in 3 min at 250 °C, and the dehydrogenation activation energy is reduced to 74.57±1.36 kJ/mol, a notable reduction in comparison to that observed in pure MgH 2 . This study demonstrates the potential of the modified TiO 2 as an important kind of catalyst for solid-state hydrogen storage materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2014
·Vol. 32
·期 5
·429-433
·
IF 1.342
Xilin ZHU,Shumin HAN,Xin ZHAO,Yuan LI,Baozhong LIU
Hydrogen storage properties of 2LiNH 2 -MgH 2 system were improved by adding lanthanum hydride (LaH 3 ), and the role of LaH 3 in hydrogen sorption process of Li-Mg-N-H system was investigated. Temperature programmed sorption results showed that the addition of lanthanum hydride reduced the dehydriding/hydriding onset temperature of 2LiNH 2 -MgH 2 system by at least 15 K. Moreover, A 0.053 wt.%/min average rate was determined for the hydrogen desorption of 2LiNH 2 -MgH 2 -0.05LaH 3 composite, while it was only 0.035 wt.%/min for 2LiNH 2 -MgH 2 system. Hydrogen absorption capacity increased from 1.62 wt.% to 2.12 wt.% within 200 min by adding LaH 3 into 2LiNH 2 -MgH 2 system at 383 K. In the dehydrogenation of 2LiNH 2 -MgH 2 -0.05LaH 3 composite, LaH 2 transferred to LaN phase, which reversed to LaH 2 in the following hydrogen adsorption process. The reversible reaction of LaH 2 effectively promoted the hydrogen sorption of Li-Mg-N-H system. Moreover, the homogenous distribution of fine La hydride was favorable to improving effect of lanthanum hydride.
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2022
·
IF 4.177
Heng Lu,Jianbo Li,Tianyu Xie,Xiang Zhou,Zhao Ding,Yangfan Lu,Yu’an Chen,Zhongqing Liu,Qian Li,Fusheng Pan
We report the synergistic catalytic effects of AlH3–TiF3 composites that can improve the kinetic properties of Mg-based hydrogen storage materials. The resulting MgH2–AlH3–TiF3 composites (MA-F) exhibit 5.55 wt % reversible hydrogen storage capacity with a reduced activation energy of 100.85 kJ/mol H2. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements revealed that the in situ generated Al* reacts with TiF3 and Mg, forming Al3Ti, AlF3, and Mg17Al12 during the heating process. Al3Ti and AlF3 act as the actual catalytically active centers for the hydrogen desorption and absorption processes, accelerating the reversible conversion between Mg and MgH2. Moreover, the presence of Mg17Al12 can narrow the free energy gap between the hydrogenated and dehydrogenated states, favoring the improvement of thermodynamic properties. These discoveries demonstrate the importance of the interaction between Mg/MgH2 and transition metal composites to improve the hydrogen storage functionalities.
研究领域:
材料科学
·
氢气储存
·
能量存储
·
催化
·
纳米材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·Vol. 43
·期 7
·3731-3740
·
IF 4.229
Dandan Peng,Zhenmin Ding,Lu Zhang,Yaokun Fu,Jiasheng Wang,Yuan Li,Shumin Han
Carbon aerogel (CA) microspheres with highly crumpled graphene–like sheets surface and network internal structure have been successfully prepared by an inverse emulsion polymerization routine, subsequently ball milled with Mg powder to fabricate Mg@CA. The Mg change into MgH 2 phases, decorating on the surface of the CA forming MgH 2 @CA microspheres composite after the hydrogenation process at 400 °C. The MgH 2 @CA microspheres composite displays MgH 2 –CA shell–core structure and shows enhanced hydrogenation and dehydrogenation rates. It can quickly uptake 6.2 wt% H 2 within 5 min at 275 °C and release 4.9 wt% H 2 within 100 min at 350 °C, and the apparent activation energy for the dehydrogenation is decreased to 114.8 kJ mol −1 . The enhanced sorption kinetics of the composite is attributed to the effects of the in situ formed MgH 2 NPs during the hydrogenation process and the presence of CA. The nanosized MgH 2 could reduce the hydrogen diffusion distance, and the CA provides the sites for nucleation and prevents the grains from agglomerating. This novel method of in situ producing MgH 2 NPs on zero–dimensional architecture can offer a new horizon for obtaining high performance materials in the hydrogen energy storage field.
研究领域:
材料科学
·
氢能存储
·
纳米材料
·
能源材料
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 16
·7042-7048
·
IF 4.177
Jiasheng Wang,Shumin Han,Zhibin Wang,Dandan Ke,Jingjing Liu,Mingzhen Ma
The 2LiBH4–MgH2 + 20 wt% BaTiO3 composite was prepared by ball-milling LiBH4, MgH2 and BaTiO3, and the effect of BaTiO3 on the hydrogen storage properties of the composite was investigated. TG-DSC results show that the onset dehydrogenation temperature of the composite is 299 °C, which is 124 °C lower than that of 2LiBH4–MgH2, and the dehydrogenation amount of the composite increases from 6.86 wt% to 7.48 wt% at 500 °C. Kinetic tests show that the dehydrogenation amount of 2LiBH4–MgH2 + 20 wt% BaTiO3 reaches 1.5 wt% within 400 seconds, almost 10 times that of 2LiBH4–MgH2. BaTiO3 reacts with LiBH4 during the dehydrogenation of the composite and generates BaB6 and TiO2. BaB6 is beneficial to lower the stability of LiBH4, while TiO2 has a catalytic effect in improving the hydrogenation/dehydrogenation kinetics of the reaction between Mg and LiBH4.
研究领域:
材料科学
·
氢能
·
固态化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 60
·37677-37683
·
IF 3.361
Ying Cheng,Shuhua Zhou,Biqing Shi,Bing Dong,Xianbin Ji,Siqi Li,Wei Zhang
The effect of the solid solution Ce0.8Fe0.1Zr0.1O2, successfully prepared by a hydrothermal synthesis method, on the hydrogen sorption properties of MgH2 is systemically investigated. The Ce0.8Fe0.1Zr0.1O2-modified MgH2 composite exhibits remarkable hydrogen kinetics properties and thermodynamics behavior compared to those of as-milled MgH2, with a reduction in the initial desorption temperature of approximately 82 K. With respect to the hydrogen kinetics, the Ce0.8Fe0.1Zr0.1O2-added sample could uptake approximately 5.3 wt% H2 at 473 K in 2500 s, whereas only 1.5 wt% hydrogen could be absorbed by pristine MgH2 in the same conditions. Furthermore, about 4.5 wt% of hydrogen could be desorbed by Ce0.8Fe0.1Zr0.1O2-doped MgH2 composite at 623 K, which was 2 wt% higher than the as-milled MgH2 sample over the same period of time. The decomposition apparent activation energy for MgH2–Ce0.8Fe0.1Zr0.1O2 is reduced to 84.3 kJ mol−1, which is about 77 kJ mol−1 lower than that of pristine MgH2. It is believed that the notable improvement in the hydrogen sorption kinetics is due to the in situ-formed active species of CeH2.51 and MgO as well as the abundant oxygen vacancies, which play a vital role in catalyzing the hydrogen sorption performance of MgH2.
研究领域:
材料科学
·
能源储存与转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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 Energy Storage
·
2024
·
IF 8.9
Ziqi Liu,Ruolin Zhao,Feifan Hong,Sizhi Ding,Jiakun Yang,Renhuan Li,Yi Fan,Haizhen Liu,Jin Guo,Zhiqiang Lan
Hydrogen storage materials are the primary solution for addressing safety concerns in hydrogen energy storage and transportation. Despite the advantages of magnesium-based hydrogen storage materials, such as high capacity and good reversibility, their poor kinetic performances severely limit their practical applications. In this study, the synthesis of titanium nitride supported on carbon (TiN@C) was achieved through a controllable hydrothermal method , aiming to enhance the hydrogen storage performances of MgH 2 .With the catalytic action of TiN@C, MgH 2 could rapidly release over 6.0 wt% of hydrogen at 300 °C within 15 min, while the onset dehydrogenation temperature decreased to 226 °C. The dehydrogenated MgH 2 could reabsorb 5.80 wt% of hydrogen at 200 °C for 15 min with a reduced activation energy of 44.9 kJ·mol −1 , demonstrating excellent kinetic performance. Mechanism analysis revealed that the multiphase interface between MgH 2 (Mg) and TiN@C significantly improved the hydrogen desorption kinetics of materials, especially TiN and the in-situ formed TiH 2 were the main reasons for improving the hydrogen storage performance of materials.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
SN Applied Sciences
·
2018
·Vol. 1
·期 1
·1-9
·
IF 0
Zhang Liuting,Ji Liang,Yao Zhendong,Cai Zeliang,Sun Ze,Yan Nianhua,Zhu Xinqiao
The hydrogen storage properties of MgH 2 – x wt%TiCN ( x = 5, 10, 15) composites were systematically investigated and the results show that the addition of TiCN can effectively improve the de/rehydrogenation kinetics of MgH 2 . Taken the onset dehydrogenation temperature and isothermal de/rehydrogenation kinetics into consideration, the MgH 2 –10 wt% TiCN composite was shown to have the best performance. It was found that the MgH 2 –10 wt% TiCN composite could release 4 wt% H 2 in 17.3 min at 300 °C while the as-synthesized MgH 2 could not release any hydrogen under the same condition. Besides, the MgH 2 –10 wt% TiCN composite could absorb 4.63 wt% H 2 under 3.2 MPa hydrogen pressure at 300 °C within 20 s. Compared with as-synthesized MgH 2 , the activation energy of the MgH 2 –10 wt% TiCN composite was significantly decreased from 183.76 ± 10 to 106.82 ± 5 kJ/mol. X-ray diffraction analysis revealed that the TiCN remained stable during the ball milling and the following de/rehydrogenation cycle. The catalytic mechanism was also proposed that the TiCN particles absorbed on MgH 2 not only served as charge transfer centers and accelerated the hydrogen incorporation and dissociation rate but also provided more diffusion channels for hydrogen, which contributed to the good de/rehydrogenation properties of MgH 2 .
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Jinhui Wang,Yuting Li,Quanhui Hou,Peng Jiang,Zhao Ding,Yonglian Xiong
Magnesium-based materials are favored by researchers because of their high hydrogen storage capacity, but they cannot be put to daily use because of their more demanding reaction conditions. Recently, the method to improve the hydrogen storage performance of MgH 2 by catalyst doping has been widely investigated. In this paper, Co 3 O 4 catalysts were prepared by homogeneous precipitation method. It was demonstrated that the Co 3 O 4 catalyst could effectively improve the hydrogen storage performance of MgH 2 . According to the experimental results, the dehydrogenation onset temperature of the MgH 2 +15 wt% Co 3 O 4 composite was about 200 °C, which was about 130 °C lower than that of pure MgH 2 , and the amount of dehydrogenation was 6.26 wt%. The dehydrogenation activation energy of the MgH 2 +15 wt% Co 3 O 4 composite was reduced to 89.13 kJ/mol, which was about 45.7% lower than that of pure MgH 2 . After complete dehydrogenation, the composites started to absorb hydrogen at 50 °C with 6.2 wt%, while the activation energy of reabsorption was also reduced to 47.97 kJ/mol. After 10 cycles of MgH 2 +15 wt% Co 3 O 4 composites, the hydrogen storage capacity of MgH 2 could still be maintained at 99%, which indicated that it had good cycling stability. It was confirmed by various characterizations that Co 3 O 4 was uniformly distributed on the MgH 2 matrix after ball milling . After the first reaction, Co 3 O 4 was converted to CoO, which was uniformly attached to the Mg/MgH 2 surface and stabilized during the cycling process, continuing to provide active sites for hydrogen.
研究领域:
材料科学
·
催化化学
✓ 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）