JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Zi Jun Gao,Zhou Peng Li,Bin Hong Liu
In this work, we synthesized La-incorporated Ni-B amorphous composites and investigated their effects on enhancing dehydrogenation/hydrogenation properties of MgH 2 . MgH 2 with 5 wt% 2La-3Ni-B demonstrated significantly improved dehydriding kinetics. About 6.0 wt% hydrogen could be released within 5 min at 300 °C. Moreover, no decrease in deydrogenation rate was observed within ten cycles. XRD , XPS , SEM and HRTEM examinations revealed that the La incorporation into Ni-B resulted in an amorphous La-B-O structure that could keep its disorder state up to 600 °C. The crystallization and growth of Ni dispersed in the La-B-O structure was significantly retarded. Also the alloying of Mg with Ni or La was not observed. As a result, the added La-Ni-B composites showed higher structural and catalytic stability than Ni-B during hydriding/dehydriding cycling of MgH 2 at high temperatures.
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
International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 29
·期 7
·1464-1473
·
IF 3.85
Song Mengchen,Zhang Liuting,Zheng Jiaguang,Yu Zidong,Wang Shengnan
Novel graphene-supported FeOOH nanodots (FeOOH NDs@G) were successfully prepared by a facile hydrothermal method and doped into MgH 2 through mechanical ball-milling. MgH 2 with 10wt% FeOOH NDs@G began to release hydrogen at 229.8°C, which is 106.8°C lower than that of pure MgH 2 . The MgH 2 -10wt% FeOOH NDs@G composite could reversibly absorb 6.0wt% hydrogen at 200°C under a 3.2 MPa hydrogen pressure within 60 min. With the addition of FeOOH NDs@G, the dehydrogenation and hydrogenation activation energy of MgH 2 was decreased to 125.03 and 58.20 kJ·mol −1 (156.05 and 82.80 kJ·mol −1 for pure MgH 2 ), respectively. Furthermore, the hydrogen capacity of the FeOOH NDs@G composite retained 98.5% of the initial capacity after 20 cycles, showing good cyclic stability. The catalytic action of FeOOH NDs@G towards MgH 2 could be attributed to the synergistic effect between graphene nanosheets and in-situ formed Fe, which prevented the aggregation of Mg/MgH 2 particles and accelerated the hydrogen diffusion during cycling, thus enabling the MgH 2 -10wt% FeOOH NDs@G composite to exhibit excellent hydrogen storage performance.
研究领域:
材料科学
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氢存储
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纳米材料
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催化
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Xiaohui Lu,Xinglin Yang,Xiaoxu Liang,Quanhui Hou,Jie Kong,Jianye Su
Solid-state hydrogen storage technology is attracting considerable attention in the field of energy storage as a potential solution for clean energy storage and transmission. MgH 2 is one of the most promising materials for solid-state hydrogen storage today. However, its practical applications are limited by high dehydrogenation temperature, slow rate, and low cyclic stability. In this paper, TiO 2 _ZnTiO 3 with carbon nanotubes (CNTs) is successfully synthesized by simple hydrothermal, calcination, and mechanical ball milling methods. In particular, MgH 2 +10 wt% TiO 2 _ZnTiO 3 @CNTs exhibited excellent hydrogen storage properties during cycling compared to the composites without added CNTs. The composite material can dehydrogenate up to 6.1 wt% in 10 min at 300 °C, approximately one order of magnitude higher than the rate of pure MgH 2 . And the corresponding whole dehydrogenation process can be accomplished in 15 min. The starting hydrogen absorption temperature of the composite material is less than 50 °C, and the activation energy is significantly reduced. Relevant tests indicate that the new phase exists stably during the dehydrogenation/absorption process, which helps promote the dissociation and diffusion of hydrogen atoms. This study broadens the application of catalysts in hydrogen storage and provides a strategy to promote the sustainable utilization and development of clean energy.
研究领域:
材料科学
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能源存储
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催化
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氢能技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Senliang Xi,Xiaojun Wang,Kudzaishe Caren Tome,Tonghuan Zhang,Zongying Han,Meng Gao,Shixue Zhou,Hao Yu
The hydrogen storage performances of MgH 2 improved by the addition of Ni and SAPO-34 were studied in detail. The mixture of MgH 2 with Ni and SAPO-34 was a physical reaction as shown by the X-ray diffraction (XRD) results. The SAPO-34 and Ni were uniformly distributed on the surface of MgH 2 . The thermodynamic and kinetic properties of 90MgH 2 /5Ni/5SAPO-34 were investigated by differential scanning calorimetry (DSC) and pressure-composition-isothermal (PCI) methods. The results showed that the dehydrogenation activation energy of 90MgH 2 /5Ni/5SAPO-34 decreased by 64.3 kJ/mol compared with that of MgH 2 . In addition, the relationship between the value of dehydrogenation heat and hydrogen content was also investigated by in-situ calorimetry. The enthalpy value of each sample in the dehydrogenation processes were calculated by in-situ calorimetry measurement. The dehydrogenation enthalpies of as-milled MgH 2 and 90MgH 2 /5Ni/5SAPO-34 were 63.2 kJ/mol H 2 and 53.6 kJ/mol H 2 , respectively. Thus, the co-doping of Ni and SAPO-34 contributed significantly to decrease the thermodynamic stability and improve the hydrogen sorption kinetic properties of MgH 2 .
研究领域:
材料科学
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氢储能技术
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物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Chao Ma,Baozhou Zhao,Jianguang Yuan,Yunfeng Zhu,Jiguang Zhang,Bogu Liu,Ying Wu,Liquan Li,Shaoxiong Zhou
Herein, nanodisc-like MnTiO 3 was successfully prepared via a hydrothermal method , and for the first time, the MnTiO 3 nanodiscs were doped into magnesium hydride (MgH 2 ) for the study. In the first dehydrogenation cycle, MgH 2 -8 wt% MnTiO 3 showed a low onset hydrogen release temperature of 202 °C, while MnTiO 3 was transformed into Mg 6 MnO 8 and TiO x by reaction with MgH 2 , which played a real catalyst in the subsequent reaction. The composite system could instantly absorb 4.79 wt% H 2 in 100 s at 150 °C and rapidly release about 5.71 wt% H 2 in 500 s at 300 °C. The Kissinger plot revealed that the dehydrogenation activation energy dropped to 72.06 kJ/mol, which was significantly lower than that of as-milled MgH 2 . Moreover, after 50 isothermal cycles, the composite system still has an excellent capacity retention rate of 94.4 %. Compositional and structural analysis indicated that the in situ formation of TiO x and Mg 6 MnO 8 during dehydrogenation provided a multivalent multielement catalytic surrounding that accelerated the H atoms adsorption and dissociation, yielding a better kinetic property of MgH 2 .
研究领域:
材料科学
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能源存储
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催化
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jiage Yu,Kun Wang,Wenlong Song,Hui Huang,Chu Liang,Yang Xia,Jun Zhang,Yongping Gan,Feng Wang,Wenkui Zhang
Nano-silicon is a star anode material for the next generation Li-ion batteries with the merits of high theoretical capacity and low voltage plateau. To date, it remains a great challenge to efficiently convert low-cost silica (SiO 2 ) into nano-Si at a low temperature due to the solid Si-O band (the bond energy is 460 kJ mol −1 ). Herein, a low temperature MgH 2 -AlCl 3 -SiO 2 melt system is developed to synthesize nano-Si through the reduction of SiO 2 by MgH 2 in the molten AlCl 3 . It is confirmed to be a controllable liquid-solid process with no side reactions and high Si yield of 97.6%. The battery grade nano-Si product can be obtained by suitable post-treatment without undesirable HF etching. This reaction can be initiated at as low as 150 °C, which is much lower than mostly reported synthesis routes of nano-Si. The nano-Si product with an average particle size of 22.4 nm exhibits superior electrochemical storage capacity of 1185 mA h g −1 over 300 cycles at 0.2 A g −1 and a low increased thickness of 14.5% at 2 A g −1 over 500 cycles. We believe that this low temperature melt system not only paves the new path of synthesizing nano-Si, but also gives a new insight into the effects of nanoscale particle size on the electrochemical performance of Si anode.
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
·
2018
·
IF 4.229
Meijia Liu,Xuezhang Xiao,Shuchun Zhao,Sina Saremi-Yarahmadi,Man Chen,Jiaguang Zheng,Shouquan Li,Lixin Chen
Transition-metal nanoparticles (NPs) can catalytically improve the hydrogen desorption/absorption kinetics of MgH 2 , yet this catalysis could be enhanced further by supporting NPs on carbon-based matrix materials . In this work, Co NPs with a uniform size of 10 nm loaded on carbon nanotubes (Co@CNTs) were synthesized in situ by carbonizing zeolitic imidazolate framework-67 (ZIF-67). The novel Co@CNTs nanocatalyst was subsequently doped into MgH 2 to remarkably improve its hydrogen storage properties. The MgH 2 -Co@CNTs starts to obviously release hydrogen at 267.8 °C, displaying complete release of hydrogen at the capacity of 6.89 wt% at 300 °C within 15 min. For absorption, the MgH 2 -Co@CNTs uptakes 6.15 wt% H 2 at 250 °C within 2 min. Moreover, both improved hydrogen capacity and enhanced reaction kinetics of MgH 2 -Co@CNTs can be well preserved during the 10 cycles, which confirms the excellent cycling hydrogen storage performances. Based on XRD , TEM and EDS results, the catalytic mechanism of MgH 2 -Co@CNTs can be ascribed to the synergetic effects of reversible phase transformation of Mg 2 Co to Mg 2 CoH 5 , and physical transformation of CNTs to carbon pieces. It is demonstrated that phase transformation of Mg 2 Co/Mg 2 CoH 5 can act as “hydrogen gateway” to catalytically accelerate the de/rehydrogenation kinetics of MgH 2 . Meanwhile, the carbon pieces coated on the surfaces of MgH 2 particles not only offer diffusion channels for hydrogen atoms but also prevent aggregation of MgH 2 NPs, resulting in the fast reaction rate and excellent cycling hydrogen storage properties of MgH 2 -Co@CNTs system.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2020
·
IF 5.604
T. Huang,X. Huang,C. Hu,J. Wang,H. Liu,Z. Ma,J. Zou,W. Ding
In this work, one-dimensional NiMoO 4 and CoMoO 4 nanorods are prepared and introduced into MgH 2 to improve its hydrogen storage properties. It is observed that the MgH 2 –NiMoO 4 system exhibits lower dehydrogenation temperature and faster kinetics than the MgH 2 –CoMoO 4 system and pure MgH 2 , indicating the superior promoting effect of NiMoO 4 over CoMoO 4 . Concretely, NiMoO 4 reacts with MgH 2 during the first dehydrogenation to in situ form Mg 2 Ni and Mo 0 , both of which are crucial factors for the following hydrogen cycling process. The ‘Mg 2 Ni/Mg 2 NiH 4 ’ mutual transformation upon hydrogen release/uptake is the well-known ‘hydrogen pump’ effect which boosts the hydrogen storage performance of MgH 2 . Moreover, theoretical calculations reveal the dual roles of Mo 0 played for the hydrogen storage in MgH 2 : i) it accelerates the hydrogen de/absorption of MgH 2 through weakening the Mg–H bonding; ii) it facilitates the mutual ‘Mg 2 Ni/Mg 2 NiH 4 ’ transformation as the formation energy of Mg 2 NiH 4 decreases under the influence of Mo 0 , which we call ‘facilitated hydrogen pump’ effect in this work. Ascribing to the collaborative action between Ni- and Mo- containing species, the hydrogen storage kinetics of MgH 2 has been accelerated.
研究领域:
材料科学
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纳米材料
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能源化学
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固态储氢
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金属氢化物
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催化材料
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理论计算
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 52
·期 3
·609-620
·
IF 4.569
Samuel Guemou,Dongqiang Gao,Fuying Wu,Jiaguang Zheng,Tao Wei,Zhendong Yao,Danhong Shang,Liuting Zhang
As an ideal material for solid-state hydrogen storage, magnesium hydride (MgH2) has attracted enormous attention due to its cost-effectiveness, abundant resources, and outstanding reversibility. However, the high thermodynamics and poor kinetics of MgH2 still hinder its practical application. In this work, a simple stirring–hydrothermal method was used to successfully prepare bimetallic Mn3O4/ZrO2 nanoparticles, which were subsequently doped into MgH2 by mechanical ball milling to improve its hydrogen sorption performance. The MgH2 + 10 wt% Mn3O4/ZrO2 composite began discharging hydrogen at 219 °C, which was 111 °C lower compared to the as-synthesized MgH2. At 250 °C, the MgH2 + 10 wt% Mn3O4/ZrO2 composite released 6.4 wt% hydrogen within 10 min, whereas the as-synthesized MgH2 reluctantly released 1.4 wt% hydrogen even at 335 °C. Moreover, the dehydrogenated MgH2 + 10 wt% Mn3O4/ZrO2 sample started to charge hydrogen at room temperature. 6.0 wt% hydrogen was absorbed when heated to 250 °C under 3 MPa H2 pressure, and 4.1 wt% hydrogen was taken up within 30 min at 100 °C at the same hydrogen pressure. In addition, compared with the as-synthesized MgH2, the de/rehydrogenation activation energy values of the MgH2 + 10 wt% Mn3O4/ZrO2 composite were decreased to 64.52 ± 13.14 kJ mol−1 and 16.79 ± 4.57 kJ mol−1, respectively, which incredibly contributed to the enhanced hydrogen de/absorption properties of MgH2.
研究领域:
材料科学
·
氢能
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Shichao Gao,Hui Wang,Xinhua Wang,Haizhen Liu,Ting He,Yuanyuan Wang,Chen Wu,Shouquan Li,Mi Yan
The FeNi 3 , MoSe 2 and MoSe 2 @FeNi 3 hollow nano-spheres synthesized by wet chemical method are used for the first time to improve the hydrogen storage properties of the MgH 2 . The results show that they all possess excellent catalytic activity in the hydrogen desorption/sorption reactions of MgH 2 . Because of the synergistic catalytic effect of MoSe 2 and FeNi 3 , the MoSe 2 @FeNi 3 has the most outstanding catalytic effect. In detail, the onset dehydrogenation temperature of MgH 2 is reduced from 310 °C to 194 °C, and its maximum dehydrogenation rate is increased by 19.8 times by the introduction of 10 wt% MoSe 2 @FeNi 3 . Furthermore, the 10 wt% MoSe 2 @FeNi 3 -doped MgH 2 sample, 5.8 wt% H 2 can be absorbed in 0.5 min at 150 °C. However, the un-doped MgH 2 sample hardly absorbs hydrogen under the same conditions. The onset hydrogen absorption temperature of the composite is only 73 °C. More importantly, it has an excellent cycling stability. These improvements are because the in situ formed MgSe, Mo, Mg 2 Ni and Fe can serve as active species, and they as well as their homogeneous distribution on MgH 2 matrix can remain stable during dehydrogenation/hydrogenation. In addition, the presence of Mg 2 Ni can convert MgH 2 to an easier pathway of hydrogen absorption/desorption. These help to facilitate the hydrogen storage performance of MgH 2 .
研究领域:
材料科学
·
能源储存
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Feifan Hong,Hong Fu,Weitao Shi,Ruolin Zhao,Renhuan Li,Yi Fan,Ziqi Liu,Sizhi Ding,Haizhen Liu,Wenzheng Zhou,Jin Guo,Zhiqiang Lan
MgH 2 has broad prospects in energy storage applications; however, its poor thermodynamic properties and slow hydrogen absorption and desorption rates are unsuitable for commercial needs. In the present work, TiO@N-C (denoted as TTONC), a highly active catalytic precursor, was employed to improve the hydrogen storage properties of MgH 2 . The TTONC-catalyzed MgH 2 could uptake hydrogen at room temperature, and the onset dehydrogenation temperature of TTONC-catalyzed MgH 2 was 94 °C lower than that of pristine MgH 2 (∼300 °C). Dehydrogenated TTONC-catalyzed MgH 2 had a capacity retention rate of 95.2% after 50 hydrogen absorption-desorption cycles. The dehydrogenation and hydrogenation apparent activation energies of MgH 2 -TTONC were 90.5 kJ.mol −1 and 52.7 kJ.mol −1 , respectively. The catalytic mechanism analysis revealed that the in situ formed Ti generated TiH 2 in the hydrogenation process, and Ti/TiH 2 acted as a hydrogen pump to diffuse hydrogen atoms in the hydrogen absorption/desorption process. The formation of stable CN layers with carbon structural defects on the surface of MgH 2 inhibited the fragmentation and agglomeration of MgH 2 particles, and they served as nucleation sites to enhance hydrogen diffusion. Hence, the dehydrogenation/hydrogenation properties and cyclic stability of MgH 2 were greatly enhanced by the addition of TTONC.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Magnesium and Alloys
·
2022
·
IF 11.813
Zhiqiang Lan,Huiren Liang,Xiaobin Wen,Jiayang Hu,Hua Ning,Liang Zeng,Haizhen Liu,Jun Tan,Jürgen Eckert,Jin Guo
Hydrogen is considered one of the most ideal future energy carriers. The safe storage and convenient transportation of hydrogen are key factors for the utilization of hydrogen energy. In the current investigation, two-dimensional vanadium carbide (VC) was prepared by an etching method using V 4 AlC 3 as a precursor and then employed to enhance the hydrogen storage properties of MgH 2 . The studied results indicate that VC-doped MgH 2 can absorb hydrogen at room temperature and release hydrogen at 170 °C. Moreover, it absorbs 5.0 wt.% of H 2 within 9.8 min at 100 °C and desorbs 5.0 wt.% of H 2 within 3.2 min at 300 °C. The dehydrogenation apparent activation energy of VC-doped MgH 2 is 89.3 ± 2.8 kJ/mol, which is far lower than that of additive-free MgH 2 (138.5 ± 2.4 kJ/mol), respectively. Ab-initio simulations showed that VC can stretch Mg-H bonds and make the Mg-H bonds easier to break, which is responsible for the decrease of dehydrogenation temperature and conducive to accelerating the diffusion rate of hydrogen atoms, thus, the hydrogen storage properties of MgH 2 are remarkable improved through addition of VC.
研究领域:
材料科学
·
能源化学
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纳米技术
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催化化学
·
计算材料学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）