Progress in Natural Science-Materials International
·
2020
·
IF 4
D.F. Wu,L.Z. Ouyang,J.M. Huang,J.W. Liu,H. Wang,X.S. Yang,H. Shao,M. Zhu
Hydrolysis of Zr(BH 4 ) 4 ·8NH 3 in deionized water can generate high purity hydrogen at room temperature. However, the sluggish hydrolysis kinetics of Zr(BH 4 ) 4 ·8NH 3 hinders its practical use. To improve its hydrogen generation properties, the effects of magnetic stirring, changing hydrolysis solution and tuning the ammonia coordination number on the hydrolysis properties of Zr(BH 4 ) 4 ·8NH 3 were investigated. Results show that both changing hydrolysis solution and tuning the ammonia coordination number can enhance the hydrolysis kinetics. The hydrolysis kinetics properties of Zr(BH 4 ) 4 ·8NH 3 were significantly improved in MgCl 2 and CoCl 2 solutions. The Zr(BH 4 ) 4 ·xNH 3 (x ≤ 8) samples were synthesized by a ball-milling method with different ammonization time (10, 60 and 180 min). Both the hydrolysis kinetics and hydrogen yield of Zr(BH 4 ) 4 ·xNH 3 (x ≤ 8) were enhanced as the ammonia coordination number (x) decreased. Thus, tuning ammonia coordination number is an effective way to control the hydrolysis properties of Zr(BH 4 ) 4 ·xNH 3 (x ≤ 8).
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhi Zhang,Dongqiang Gao,Jiaguang Zheng,Ao Xia,Qingbo Zhang,Li Wang,Liuting Zhang
For solid-state hydrogen storage, Mg(BH 4 ) 2 has long been recognized as a promising material. However, its higher thermal stability is distant from conditions for practical application. Herein, it is effectively established that VF 4 nanoparticles anchored on 2D Mxene Ti 3 C 2 (VF 4 @Ti 3 C 2 ) have efficiently catalytic effects towards the hydrogen storage process of Mg(BH 4 ) 2 . The MBH-VF 4 @Ti 3 C 2 sample started releasing hydrogen at 90 °C, which was 182 °C and 55 °C lower than those of additive-free Mg(BH 4 ) 2 and MBH-20Ti 3 C 2 composites. Additionally, the MBH-20VF 4 @Ti 3 C 2 composite desorbed more than 8 wt% H 2 at 275 °C. The activation energies of dehydrogenation were reduced, and the improved reversibility of VF 4 @Ti 3 C 2 -doped Mg(BH 4 ) 2 was also discussed. According to microstructural study, the heterostructural VF 4 @Ti 3 C 2 interacted with Mg(BH 4 ) 2 to produce VH 2.01 and metallic Ti during re/dehydrogenation, which worked as active species to improve hydrogen storage performance in Mg(BH 4 ) 2 .
研究领域:
材料科学
·
能源存储
·
催化
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Xuancheng Wang,Xuezhang Xiao,Jiaguang Zheng,Xu Huang,Man Chen,Lixin Chen
The solvent-free amorphous Mg(BH 4 ) 2 composite was in-situ synthesized by ball milling LiBH 4 and MgCl 2 . It is found that the onset dehydrogenation temperature of the as-synthesized composite is 126.9 °C, which is roughly 156 °C lower than that of pristine Mg(BH 4 ) 2 . The activation energy of the amorphous Mg(BH 4 ) 2 and pristine Mg(BH 4 ) 2 for the first dehydrogenation step was calculated as 120.01 kJ/mol and 487.99 kJ/mol, respectively. Hence the kinetics improvement is certified by the lower E a value of the dehydrogenation process. When adding NbF 5 into the composite, the catalyzed composite exhibits better hydrogen storage properties compared to pristine and amorphous Mg(BH 4 ) 2 . The catalyzed composite starts to release hydrogen at proximately 120 °C with a total capacity of 10.04 wt%. The reversibility of the catalyzed composite is also improved. The capacity of the catalyzed composite at the second cycle is 5.5 wt%. For the third and fourth cycles the catalyzed composite can still liberate 4 wt% H 2 . Besides, the onset hydrogen desorption temperature during four cycles are extremely lower than those of pristine and amorphous Mg(BH 4 ) 2 . The peaks of the intermediate MgB 12 H 12 is detected by FTIR as the regenerated hydrogenation product in the catalyzed composite. It can be speculated from the detailed analysis that there are mainly three reasons for the improved properties. Firstly, the additive NbF 5 is favorable to enhance the hydrogen storage properties by modifying the dehydrogenation path and producing MgF 2 and NbB 2 as new products. Secondly, the in-situ formation of amorphous Mg(BH 4 ) 2 is likely to improve the dehydrogenation properties of the samples due to its different reactivity comparing to crystal ones. Finally, LiCl can serve as buffer in the composite and thus improve the dehydrogenation properties.
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
·
2020
·
IF 4.939
Jiaguang Zheng,Zhendong Yao,Xuezhang Xiao,Xuancheng Wang,Jiahuan He,Man Chen,Hao Cheng,Liuting Zhang,Lixin Chen
Novel porous hollow carbon nanospheres (HCNS) have been synthesized and utilized as scaffold for LiBH 4 –Mg(BH 4 ) 2 eutectic borohydride (LMBH). Large loading amounts of LMBH (33, 50 and 67 wt%) have been melt-infiltrated into HCNS, and the significantly improved dehydrogenation properties have been discovered. The LMBH@HCNS composites not only exhibit high actual dehydrogenation amounts and fast hydrogen desorption rates, but also an increased reversible hydrogen storage capacities after three cycles without obvious degradation. Further structural tests have revealed that the over-infiltrated LMBH covering the spherical surface of HCNS could also contribute to the improved hydrogen storage behaviors, due to a strong interfacial adhesion effect that avoid LMBH from aggregation during de/rehydrogenation cycles.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·Vol. 41
·期 39
·17462-17470
·
IF 3.205
Bing Zhai,Xuezhang Xiao,Wenping Lin,Xu Huang,Xiulin Fan,Shouquan Li,Hongwei Ge,Qidong Wang,Lixin Chen
NbF 5 and eutectic 0.68LiBH 4 –0.32Ca(BH 4 ) 2 were successively infiltrated into highly ordered mesoporous carbon (CMK-3) to obtain a LiBH 4 –Ca(BH 4 ) 2 –NbF 5 @CMK-3 composite. A synergetic effect of nanoconfinement and catalysis on hydrogen desorption properties of the composite was achieved. The onset desorption temperature of LiBH 4 –Ca(BH 4 ) 2 –NbF 5 @CMK-3 is dramatically lower than 120 °C compared with that of as-milled LiBH 4 –Ca(BH 4 ) 2 or LiBH 4 –Ca(BH 4 ) 2 @CMK-3. A hydrogen amount as high as 13.3 wt% can be released within 250 min for LiBH 4 –Ca(BH 4 ) 2 –NbF 5 @CMK-3, compared with only 10.4 wt% for pure LiBH 4 –Ca(BH 4 ) 2 , in which nanoconfinement and catalysis both make some contribution. The cycling hydrogen desorption performance of the composite becomes better likewise due to the addition of NbF 5 . Further microstructure analysis reveals that F − tended to bind with Ca 2+ to form CaF 2 , whereas Nb compound is believed to catalyze the whole system in the form of Nb-based boride (NbB 2 ).
研究领域:
材料科学
·
能源化学
·
纳米科技
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储氢材料
·
物理化学
✓ 已验证
DOI
高影响因子
GENE
·
2015
·
IF 2.138
Ping Chen,Jiying Wang,Haiyin Li,Yan Li,Peng Chen,Tian Li,Xi Chen,Junjie Xiao,Liang Zhang
In insects, pigment patterns are formed by melanin, ommochromes, and pteridines. Here, the effects of pteridine synthesis on melanin formation were studied using 4th instar larvae of a wild-type silkworm strain, dazao ( Bombyx mori ), with normal color and markings. Results from injected larvae and in vitro integument culture indicated that decreased activity of guanosine triphosphate cyclohydrolase I (GTP-CH I, a rate-limiting enzyme for pteridine synthesis), lowers BH4 (6R- l -erythro-5,6,7,8-tetrahydrobiopterin, a production correlated with GTP-CH I activity) levels and eliminates markings and coloration. The conversion of phenylalanine and tyrosine to melanin was prevented when GTP-CH I was inhibited. When BH4 was added, phenylalanine was converted to tyrosine , and the tyrosine concentration increased. Tyrosine was then converted to melanin to create normal markings and coloration. Decreasing GTP-CH I activity did not affect L-DOPA (3,4- l -dihydroxyphenylalanine). GTP-CH I affected melanin synthesis by generating the BH4 used in two key reaction steps: (1) conversion of phenylalanine to tyrosine by PAH (phenylalanine hydroxylase) and (2) conversion of tyrosine to L-DOPA by TH (tyrosine hydroxylase). Expression profiles of BmGTPCH Ia , BmGTPCH Ib , BmTH , and BmPAH in the integument were consistent with the current findings.
研究领域:
昆虫学
·
生物化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Jianguang Yuan,Haixiang Huang,Zan Jiang,Yujie Lv,Bogu Liu,Bao Zhang,Youhua Yan,Ying Wu
Borohydride magnesium is widely studied as a promising hydrogen storage material due to its high gravimetric and volumetric density (14.9 wt % and 112 g/L, respectively). Different types of catalysts play a good catalytic role in enhancing the hydrogen desorption rates in borohydride systems. In the present paper, multiwalled carbon nanotubes supported Ni (Ni/MWCNTs) were synthesized by a chemical reduction method, and the catalyst was introduced into Mg(BH4)2 to enhance the dehydrogenation kinetics. The effect of Ni/MWCNTs on the microstructural evolution and hydrogen storage properties of Mg(BH4)2 is studied. The Mg(BH4)2-5wt% Ni/MWCNTs (95M@5NiMWCNTs) sample exhibits the best hydrogen storage performance; it starts to release hydrogen at 93 °C, which is 113 °C lower than that of the primary Mg(BH4)2 sample. Moreover, it takes only 3600 s to desorb hydrogen completely at 300 °C, showing a significant improvement on hydrogen desorption kinetics. In comparison with the primary Mg(BH4)2 sample, the dehydriding apparent activation energy of the 95M@5Ni3MWCNTs2 sample is significantly lowered to 119.5 kJ mol–1. Transmission electron microscopy analysis exhibits that the striking improvement of dehydriding properties of Mg(BH4)2 is mainly due to the synergistic catalysis of Ni and MWCNTs. This work provides a new method for designing and synthesizing high-performance catalysts in borohydride hydrogen storage materials, which is potentially utilized as a hydrogen supplier for hydrogen fuel cells.
研究领域:
氢能存储
·
材料科学
·
纳米复合材料
·
催化
✓ 已验证
DOI
高影响因子
RARE METALS
·
2025
·
IF 11
Zhen-Xuan Ma,Jia-Guang Zheng,Mei-Ling Lv,Cong Li,Chang-Hai Wu,Pan-Pan Zhou,Chao Su,Lei Ge
en This research uncovered the influence of nitrogen-doped MXene Ti 3 CN on the reversible hydrogen storage properties of Mg(BH 4 ) 2 . The Mg(BH 4 ) 2 -20Ti 3 CN composite began releasing hydrogen at a temperature of 80°C. In addition, the composite discharged over 8.8 wt% hydrogen at a comparatively lower temperature of 270°C, whereas the pure Mg(BH 4 ) 2 emitted merely 5.9 wt% hydrogen under identical circumstances, which exhibited remarkably enhanced dehydrogenation kinetics. Furthermore, upon completion of four cycles, Mg(BH 4 ) 2 -20Ti 3 CN retained a reversible hydrogen storage capacity of 4.5 wt%, representing an 80% improvement over the undoped Mg(BH 4 ) 2 . In the course of the dehydrogenation phase, the boron atoms in Mg(BH 4 ) 2 were anchored by nitrogen atoms in Ti 3 CN to form B-N bonds, which helped suppress the formation of MgB 12 H 12 . During the subsequent rehydrogenation process, the B-N bonds broke, and the boron atoms reparticipated in the reversible transformation into [BH 4 ] − clusters. Meanwhile, the formation of Ti 0 by the reaction of Mg(BH 4 ) 2 with Ti 3 CN weakened the B-H bond energy, and the layered structure provided an effective way for hydrogen spillover. These factors collectively improved the reversible hydrogen storage capabilities of Mg(BH 4 ) 2 . 摘要 zh 本研究揭示了氮掺杂MXene Ti 3 CN对Mg(BH 4 ) 2 可逆储氢性能的影响。Mg(BH 4 ) 2 -20Ti 3 CN复合材料在温度80°C时开始放氢。此外,在270°C的较低温度下,该复合材料的氢排放量超过8.8 wt%,而在相同的条件下,纯Mg(BH 4 ) 2 的氢排放量仅为5.9 wt%,脱氢动力学显著增强。在完成四个循环后,Mg(BH 4 ) 2 -20Ti 3 CN保留了4.5 wt%的可逆储氢容量,比未掺杂的Mg(BH 4 ) 2 提高了80%。在脱氢过程中,Mg(BH 4 ) 2 中的硼原子被Ti 3 CN中的氮原子锚定形成B-N键,有助于抑制MgB 12 H 12 的形成。在随后的再氢过程中,B-N键断裂,硼原子重新参与可逆转化为[BH 4 ] − 簇。同时,Mg(BH 4 ) 2 与Ti 3 CN反应生成Ti 0 ,削弱了B-H键能,层状结构也为氢溢出提供了有效路径。这些因素共同提高了Mg(BH 4 ) 2 的可逆储氢能力。
研究领域:
材料科学
·
氢气储存
·
纳米材料
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
Journal of Magnesium and Alloys
·
2022
·
IF 11.813
Yongyang Zhu,Mili Liu,liming Zeng,Yin Wang,Daifeng Wu,Rui Li,Qing Zhou,Renheng Tang,Fangming Xiao
The hydrolysis of MgH 2 delivers high hydrogen capacity (15.2 wt%), which is very attractive for real-time hydrogen supply. However, the formation of a surface passivation Mg(OH) 2 layer and the large excess of H 2 O required to ensure complete hydrolysis are two key challenges for the MgH 2 hydrolysis systems. Now, a low-cost method is reported to synthesize MgH 2 @Mg(BH 4 ) 2 composite via ball-milling MgH 2 with cheap and widely available B 2 O 3 (or B(OH) 3 ). By adding small amounts of B 2 O 3 , the in-situ formed Mg(BH 4 ) 2 could significantly promote the hydrolysis of MgH 2 . In particular, the MgH 2 –10 wt% B 2 O 3 composite releases 1330.7 mL·g −1 H 2 (close to 80% theoretical hydrogen generation H 2 ) in H 2 O and 1520.4 mL·g −1 H 2 (about 95%) in 0.5 M MgCl 2 in 60 min at 26 °C with hydrolysis rate of 736.9 mL·g −1 ·min −1 and 960.9 mL·g −1 ·min −1 H 2 during the first minute of the hydrolysis, respectively. In addition, the MgCl 2 solution allows repeated use by filtering and exhibits high cycle stability (20 cycles), therefore leading to much reduced capacity loss caused by the excess H 2 O. We show that by introducing B 2 O 3 and recycling the 0.5 M MgCl 2 solution, the system hydrogen capacity can approach 5.9 wt%, providing a promising hydrogen generation scheme to supply hydrogen to the fuel cells.
研究领域:
材料科学
·
能源化学
·
无机合成
·
氢能技术
·
表面工程
✓ 已验证
DOI
高影响因子
BIOCHEMICAL PHARMACOLOGY
·
2026
·
IF 6.5
Wen-jie Bu,Si-si Li,Yi Yu,Chao-run Dong,Dong Lu,Dong-jie Zheng,Zhe-yu Fan,Guang Lian,Wei Zhang,Yun-long Bai
Obesity and cigarette smoking are two major cardiovascular risk factors that frequently coexist, yet their combined impact on vascular function and the underlying mechanisms remains insufficiently defined. Here, we show that short-term cigarette smoke (CS) exposure induces persistent endothelial dysfunction exclusively in obese mice, while having minimal vascular effects in lean mice. Obese mice exposed to CS exhibited severely impaired acetylcholine-induced vasodilation, elevated blood pressure, sustained vascular oxidative stress, and accelerated endothelial senescence. Integrated metabolomic and transcriptomic analyses revealed that CS superimposed on obesity drives a distinct metabolic and transcriptional reprogramming characterized by disrupted redox homeostasis and inflammatory signaling. Mechanistically, CS selectively suppressed endothelial GTP cyclohydrolase 1 (GTPCH1) expression in obese mice, resulting in tetrahydrobiopterin (BH4) depletion, endothelial nitric oxide synthase (eNOS) uncoupling, reduced nitric oxide bioavailability, and increased superoxide production. Endothelial-specific restoration of GTPCH1 expression or pharmacological treatment with sepiapterin restored eNOS coupling, normalized endothelial redox balance, and rescued vascular function. In summary, we demonstrate that CS leads to sustained endothelial dysfunction in the setting of obesity, a phenomenon that is associated with disruption of the GTPCH1/BH4/eNOS axis. This provides a mechanistic explanation for the heightened cardiovascular risk in obese smokers and identifies actionable molecular targets for intervention
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jiaguang Zheng,Xuezhang Xiao,Yan He,Man Chen,Meijia Liu,Shouquan Li,Lixin Chen
The Mg(BH 4 ) 2 -AlH 3 - x LiH ( x = 0, 0.5, 1) novel ternary composites have been synthesized through mechanical ball milling, their favorable dehydrogenation properties and mechanism have been experimentally investigated. It can be found that during ball milling, a slight amount of Mg(BH 4 ) 2 would react with LiH and transform into LiBH 4 , while most Mg(BH 4 ) 2 remained stable after ball milling. Two major dehydrogenation steps can be detected in the Mg(BH 4 ) 2 -AlH 3 - x LiH composite, which belong to the decomposition of AlH 3 and Mg(BH 4 ) 2 , respectively. Remarkably, the onset hydrogen desorption temperature of Mg(BH 4 ) 2 -AlH 3 - x LiH composite can be reduced to 125.9 °C, with a total hydrogen desorption capacity of 10.3 wt%. It is worth emphasizing that the reversible dehydrogenation capacity is obviously improved to 3.8 wt%, compared to the Mg(BH 4 ) 2 -AlH 3 composite. This reversible capacity can be held for 3 cycles without obvious degeneration. Microstructural analysis on de/rehydrogenated composite has identified the regeneration of [BH 4 ] - in Mg(BH 4 ) 2 -AlH 3 -0.5LiH composite and revealed the role of LiH in the cycling hydrogen desorption and absorption processes. The formation of LiBH 4 and MgH 2 resulted from the rehydrogenation between MgAlB 4 and LiH could be helpful for the stability of reversible hydrogen storage performance.
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
·
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
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）