JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Haiqiang Bai,Biao Liu,Ling Kang,Yanhong Wang,Jing Bai,Santosh Kumar Verma,Yunhua Xu
The ability of magnesium-based hydrogen storage materials to store and release hydrogen is hampered by their relatively slow rates. To address this, Mg-x% Co (x = 5, 10, 15) magnesium-rich hydrogen storage alloys were fabricated using reactive ball milling. The resulting alloys were multiphase, composed of Mg, Co, MgCo₂, and Mg₂CoH₅, which provided nucleation sites and improved hydrogen uptake. The reduced particle size and surface microcracks and pores enhanced hydrogen diffusion. The Mg-15 %Co alloy had the ability to take in 4.72 wt% hydrogen in 1 min when the temperature was set at 350°C. Hydrogenation resulted in the formation of a biphasic structure composed of Mg₂CoH₅ and Mg₆Co₂H₁₁. This structure destabilized the Mg-H bond and improved the kinetics of hydrogen release. The hydrogen release capacity first increased and then decreased with Co content, with Mg-10 %Co showing the best performance. Due to the combined action of ball milling and Co catalysis, the Mg-10 %Co alloy had an activation energy for hydrogen release of 113.65 kJ/mol, making it the alloy with the lowest such activation energy in the set. Differential scanning calorimetry (DSC) analysis confirms that cobalt addition reduces the hydrogen release peak temperature of Mg by 16.58–29.67 °C, with the Mg-10 % Co alloy exhibiting peak temperatures of 410.72–425.53 °C, attributed to synergistic decomposition of MgH₂ with intermediate hydrides like Mg₂CoH₅ and Mg₆Co₂H₁₁. The findings of this study indicate that alloying Mg-based alloys with transition elements while performing ball milling is a practical method for enhancing their hydrogen storage and release kinetics.
研究领域:
材料科学
·
能源存储
·
纳米技术
·
合金工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Jiaguang Zheng,Xuezhang Xiao,Liuting Zhang,Yan He,Shouquan Li,Hongwei Ge,Lixin Chen
Mg(BH 4 ) 2 has been considered as one of the promising light metal complex hydrides due to its high hydrogen capacity and low cost. But its higher thermal stability (dehydrogenation at above 300 °C) needs to be improved for the practical application. In this study, the aluminum hydride AlH 3 was introduced into complex borohydride Mg(BH 4 ) 2 to synthesize a new Mg(BH 4 ) 2 AlH 3 composite by ball milling method. It is found that the active Al ∗ formed from the self-decomposition of AlH 3 can effectively improve the dehydrogenation properties of Mg(BH 4 ) 2 , the Mg(BH 4 ) 2 AlH 3 composite starts to release hydrogen at 130.8 °C with a total hydrogen capacity of 11.9 wt.%. The dehydrogenated products of the composite is composed of Mg 2 Al 3 and B at 350 °C, resulting in the improved hydrogen desorption properties of Mg(BH 4 ) 2 AlH 3 composite. The Mg 2 Al 3 and B products would be further transformed into MgAlB 4 and Al at 500 °C. Moreover, the Mg 2 Al 3 and B dehydrogenated products show better reversible hydrogen storage property than that of the MgAlB 4 and Al products. This research shows a way to alter hydrogen de/hydrogenation route and reversibility of Mg(BH 4 ) 2 complex hydride by compositing with AlH 3 and controlling the dehydrogenation temperature.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
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
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Xiangdong Li,Kangchi Zhang,Wentao Liang,Cheng Zhong,Di Mai,Azizur Rahman,Xiaoyu Sun,Rucheng Dai,Zhongping Wang,Qiang Wu,Zengming Zhang
Recently, hydrogen sulfide (H2S) and phosphine (PH3) have attracted great attention since the observation of superconducting transitions with high crucial temperatures under high pressure, which inspired subsequent investigations of the superconductivity of nonmetallic hydrides. Here, we report the successful photochemical and thermal syntheses of a series of novel H2S–PH3–H2 ternary hydrides with varying H2S and PH3 molar ratios. Raman, infrared, UV–visible absorption spectra, and electrical transport measurements are employed to investigate the chemical reaction and electronic structure transformation under high pressure. The pressure-induced polymerization of PH3 can be confirmed in H2S–PH3–H2 by Raman and infrared spectra, and the polymerization product, P4H6, can be recovered to ambient pressure; additionally, the polymerization pressure of PH3 is evidently hampered with increasing H2S concentration. Furthermore, it has been found that low temperatures can significantly inhibit the pressure-induced polymerization of PH3. The formation of Hittorf’s phosphorus is experimentally confirmed upon unloading pressure from 100 GPa to ambient pressure, which strongly implies the decomposition of P4H6 under high pressure. The H2S–PH3–H2 molecule gradually turns red and is eventually opaque following compression, which is consistent with the red shift of the UV–visible absorption spectra. Furthermore, synchrotron infrared absorption spectra and electrical transport examined above 65 GPa indicate the insulator-to-metal transition of H2S–PH3–H2 caused by dehydrogenated polymerization of P4H6 to Hittorf’s phosphorus.
研究领域:
材料科学
·
凝聚态物理
·
超导研究
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Guorong Zhang,Jiaxi Liu,Sheng Wei,Fen Xu,Lixian Sun,Yongpeng Xia,Hehui Wang,Jinfan Wu,Yuan Gao,Qiwei Shao,Yiting Bu,Yanxun Guan,Lumin Liao,Taigen Liang,Lina Qin
Herein, a novel TiO 2 /CN heterojunction material has been prepared by one-step bubble template-assisted calcination to enhance the hydrogen storage capability of LiAlH 4 . The TEM, XPS and UPS analysis confirm that a heterostructure is formed between TiO 2 and g-C 3 N 4 successfully. The experimental findings indicate that the TiO 2 /CN significantly enhances the dehydrogenation performance of LiAlH 4 . For instance, the LiAlH 4 -7 wt% TiO 2 /CN starts to dehydrogenize at 76 °C (94 °C less than pure LiAlH 4 ) and releases 6.5 wt% H 2 at 200 °C. Meanwhile, LiAlH 4 -7 wt% TiO 2 /CN releases 4.9 wt% H 2 at 120 °C within 50 min. The mechanism analysis illustrates that AlTi 3 N is formed in situ during ball-milling. And density functional theory (DFT) calculation results reveal that the AlTi 3 N can weaken the Al-H bonds in LiAlH 4 through interfacial charge transfer. Furthermore, the TiO 2 /CN heterostructure creates an internal electric field that generates an electron-rich layer. As a result, the negative electron layer at one end of the TiO 2 /CN heterojunction has an increased affinity for H, which enhances the dehydrogenation reaction of LiAlH 4 . Clearly, both the TiO 2 /CN heterostructure and AlTi 3 N contribute to the improvement of the dehydrogenation properties of LiAlH 4 .
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
ENERGY
·
2024
·
IF 9
Xiaoming Li,Zeming Yuan,Zhenyang Li,Chenxu Liu,Tingting Zhai,Yanghuan Zhang,Tao Li
Magnesium metal and its hydride have the characteristics of high hydrogen storage capacity, which is suitable for storing hydrogen energy. In this paper, VS 2 /NC catalyst supported on nanosheet carbon was synthesized by hydrothermal method with organic matter as raw material, then the MgH 2 + x wt.% VS 2 /NC ( x = 0, 3, 6, 9) composites were prepared by ball milling with MgH 2 . The phase characterization of the composite material showed that the VS 2 and MgH 2 phases in the composite material remain stable during ball milling and subsequently, the hydrogen absorption/desorption cycle. There were V 4+ and V 2+ ions (an atomic ratio of 3.77:1) in the catalyst. At 593 K, the capacities of the composites were 5.71, 6.11, 5.62, and 5.33 wt.% H 2 , respectively. The time to reach the maximum hydrogen desorption capacity of 95% was 190, 30, 20, and 23 min, respectively. The dehydrogenation activation energy of the material with x = 6 is reduced by nearly 50 kJ/mol H 2 . The initial dehydrogenation temperature of the material decreases to 323 K. Because of the valence state transition between V ions, the band gap of the composite material is narrowed, which significantly improves the hydrogen absorption and desorption reaction kinetics.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 41
·19900-19908
·
IF 3.925
Hongwei Qiu,Xingbo Han,Shuyan Zang,Wei Liu,Guo Yang,Lijun Lv,Xiaofeng Wang,Jiaqi Duan,Shuangyu Wang
The MgH2–LiH composites with different composition ratios were prepared by different ball milling times, and the hydrogen generation performances of the composites were investigated and compared. X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy techniques were adopted to elucidate the performance improvement mechanisms. The results show that the hydrogen generation yield and kinetics can be improved with the increase of LiH content significantly. For the 7MgH2–3LiH and 1MgH2–1LiH, with the increase of the ball milling time, the hydrogen yield increases firstly, and then decreases, but the kinetics almost do not change. This may be caused by the change of particle size of the composites after ball milling. However, for the 9MgH2–1LiH, the hydrogen yield increases with ball milling time but the kinetics decrease gradually. This may be due to the gradual movement of LiH from the surface to the interior of MgH2 and to the covering of MgH2 after ball milling.
研究领域:
材料科学
·
无机化学
·
能源化学
·
纳米材料
·
储氢材料
✓ 已验证
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2022
·Vol. 30
·期 1
·54-62
·
IF 3.85
Xu Nuo,Yuan Zirui,Ma Zhihong,Guo Xinli,Zhu Yunfeng,Zou Yongjin,Zhang Yao
MgH 2 with a large hydrogen capacity is regarded as a promising hydrogen storage material. However, it still suffers from high thermal stability and sluggish kinetics. In this paper, highly dispersed nano-Ni has been successfully prepared by using the polyol reduction method with an average size of 2.14 nm, which significantly improves the de/rehydrogenation properties of MgH 2 . The MgH 2 —10wt% nano-Ni sample starts releasing H 2 at 497 K, and roughly 6.2wt% H 2 has been liberated at 583 K. The rehydrogenation kinetics of the sample are also greatly improved, and the adsorption capacity reaches 5.3wt% H 2 in 1000 s at 482 K and under 3 MPa hydrogen pressure. Moreover, the activation energies of de/rehydrogenation of the MgH 2 —10wt% nano-Ni sample are reduced to (88 ± 2) and (87 ± 1) kJ·mol −1 , respectively. In addition, the thermal stability of the MgH 2 —10wt% nano-Ni system is reduced by 5.5 kJ per mol H 2 from that of pristine MgH 2 . This finding indicates that nano-Ni significantly improves both the thermodynamic and kinetic performances of the de/rehydrogenation of MgH 2 , serving as a bi-functional additive of both reagent and catalyst.
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
Energy Storage Materials
·
2019
·
IF 0
Ke Wang,Xin Zhang,Zhuanghe Ren,Xuelian Zhang,Jianjiang Hu,Mingxia Gao,Hongge Pan,Yongfeng Liu
Magnesium hydride (MgH 2 ) is one of the most promising high-capacity hydrogen storage materials. However, limited progress has been made in storing hydrogen in Mg under ambient conditions. Here, we demonstrate for the first time that the dehydrogenated MgH 2 is fully hydrogenated below 100 °C with the presence of N-containing Nb 2 O 5 (N-Nb 2 O 5 ). MgH 2 composites doped with N-Nb 2 O 5 (10 wt%) releases hydrogen from 170 °C, which is lowered by 130 °C compared with pristine MgH 2 , while still having 6.3 wt% hydrogen capacity available. Most importantly, full hydrogenation can be achieved by the dehydrogenated N-Nb 2 O 5 -containing sample at temperature as low as 70 °C under 50 atm of hydrogen, which is superior to other known catalyst-doped MgH 2 systems. The in-situ formed NbN 0.9 O 0.1 plays the critical catalyst role due to the joint action of N and Nb as elucidated by density functional theory (DFT) calculations. This finding remarkably facilitates the future design and exploration of much higher-performance catalysts for room-temperature hydrogen storage in metal hydrides .
研究领域:
材料科学
·
化学工程
·
能源存储
✓ 已验证
产品关联
DOI
MACROMOLECULES
·
2021
·
IF 5.985
Huanhuan Yang,Shilong Wu,Quan Chen
This study focuses on the stretchability of brittle ionomers after introducing three types of hydrogen bonds, i.e., dual, triple, and quadruple hydrogen bonds. The introduction of dual or triple hydrogen bonds that are weaker than the ionic association improves the stretchability, and better improvement has been achieved for the triple hydrogen bonds. In comparison, the introduction of quadruple hydrogen bonds that are equally strong as the ionic association does not show this type of improvement. This result strongly indicates that there is an optimized strength ratio between the first (the stronger ionic) network and the secondary (the weaker hydrogen-bonding) network, i.e., the secondary network should be considerably weaker but still not too weaker than the first network. When this condition is satisfied, continuous dissociation and association of the secondary network weaken the chain retraction after the strain-induced breakup of the first network, thereby suppressing the formation of defects or microscopic cracks that potentially grow into the macroscopic fracture.
研究领域:
聚合物科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xinyu Liu,Xixi Meng,Tao Zhong,Yuxin Wang,Fuying Wu,Hu Liu,Hong Li,Liuting Zhang
Magnesium hydride (MgH 2 ) with its high hydrogen storage capacity (7.6 wt%) and exceptional reversibility, has emerged as a promising solid-state hydrogen storage material. This study designed a polymeric carbon nitride (PCN) supported single-phase Ni catalyst with superior thermal stability and catalytic activity. The optimized PCN-Ni catalyst significantly reduced the initial dehydrogenation temperature of MgH 2 to 192 ºC. At 295 ºC, the composite released 6.10 wt% H 2 within 5 min, and it subsequently absorbed 5.50 wt% H 2 within 5 min at 150 ºC. Compared to pristine MgH 2 , the activation energies for dehydrogenation and hydrogen absorption were reduced by 31.6 % and 29.4 %, respectively. Moreover, the MgH 2 + 10 wt% PCN-Ni composite exhibited remarkable cycling stability, with capacity retention rates of 96.0 % and 96.7 % after 20 hydrogenation/dehydrogenation cycles. In conclusion, this work provides a new perspective on the heterogeneous synergy of transition metal and carbon nitride composite catalysts in promoting the dehydrogenation/rehydrogenation reactions of MgH 2 and lays the foundation for the design and fabrication of highly efficient catalysts in other energy storage related fields.
研究领域:
材料科学
·
能源存储
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Liuting Zhang,Zeliang Cai,Xinqiao Zhu,Zhendong Yao,Ze Sun,Liang Ji,Nianhua Yan,Beibei Xiao,Lixin Chen
Magnesium, a cheap and abundant metal, holds tremendous promise for on-board hydrogen storage over the past several decades. However, the practical application of MgH 2 is still hampered by various challenges, including a high efficient catalyst. Zirconium and Zr-based alloys show great potential to serve as hydrogen transfer center due to their high activity in hydrogen dissociation and diffusion. In this paper, ZrCo nanosheets were successfully prepared via a facile wet-chemical technique and then introduced to improve the hydrogen storage properties of MgH 2 . With the addition of 10 wt% ZrCo nanosheets, the modified MgH 2 composite could desorb approximately 6.3 wt% H 2 within 5 min at 300 °C and absorb 4.4 wt% H 2 under 3 Mpa hydrogen pressure in 10 min even at 120 °C. The de/hydrogenation activation energy were calculated to be 90.4 ± 1.6 kJ/mol and 57.6 ± 1.0 kJ/mol for the MgH 2 +10 wt% ZrCo composite, which reasonably explain the remarkably improved de/hydrogenation performance. X-Ray Diffraction (XRD) and Transmission electron microscope (TEM) results revealed that hydrogen could be diffused between the composite more easily with the presence of well dispersed ZrCo, which acted as “hydrogen pump” for hydrogen boundaries/interface diffusion along the Mg/MgH 2 interfaces. Theoretical calculations revealed that the Mg–H bonds were extracted and weakened when adsorbed on the surface of ZrCo. Furthermore, the MgH 2 +10 wt% ZrCo composite showed superior cycling performance with the aid of graphene, indicative of potential application in the nearest future in the area of hydrogen storage.
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）