Influences and mechanisms of graphene-doping on dehydrogenation properties of MgH2: Experimental and first-principles studies

Zhang, J.; Yu, Xiaohui; Mao, Cong; Chun-guang, Long; Chen, J.; Zhou, Dianwu

doi:10.1016/j.energy.2015.06.037

Cited by 51 publications

(17 citation statements)

References 27 publications

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“…Because of their large specific surface area and unique surface properties (i.e., more functional groups), ,, BM-CNMs have been evaluated in several previous studies as a sorbent for the removal/immobilization of various contaminants including metals, radionuclides, oxyanions, and organic compounds in aqueous and soil systems (Table ). The effect of ball-milling conditions on the sorptive properties of BM-CNMs and the sorption mechanisms of various contaminates on BM-CNMs have also been investigated. ,,,− Soares et al compared the performance of novel N-doped CNTs prepared by different ball-milling methods and found that CNT-BM-M-DT (ball milling with melamine without solvent) displayed the highest amount of N functionalities and catalytic capacity for the oxidation of oxalic acid by both catalytic wet air oxidation (CWAO) and catalytic ozonation (COZ). Under the operation conditions used, oxalic acid was completely mineralized in 5 min by CWAO and in 4 h by COZ (Figure ).…”

Section: Energy and Environmental Applications Of Bm-cnmsmentioning

confidence: 99%

Ball-Milled Carbon Nanomaterials for Energy and Environmental Applications

Lyu

Gao

et al. 2017

ACS Sustainable Chem. Eng.

228

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With exceptional physicochemical properties, carbon nanomaterials (CNMs) have been widely applied in various energy and environmental applications including energy conversion, energy storage, and environmental remediation. Recent efforts have been made to prepare modified CNMs with improved electrical and chemical properties, hence broadening their potential applications. It is highly desirable to produce high-quality CNMs at a low cost and large scale, which remains a challenging task. Ball-milled CNMs (BM-CNMs) are a novel class of engineered materials that may provide new opportunities to satisfy the need. To promote the research on BM-CNMs, this work provides a comprehensive review on recent research development in (1) synthesis of various types of BM-CNMs, (2) effects of ball milling on physicochemical properties of BM-CNMs, and (3) energy and environmental applications of BM-CNMs. Different ball-milling processes for preparing BM-CNMs and modified BM-CNMs with desired particle size, structure, and surface properties are summarized and discussed. The physicochemical properties of pristine CNMs and BM-CNMs are compared. Because of BM-CNM’s unique properties, such as excellent catalytic, electrochemical, and sorptive properties, their potential applications in energy conversion, energy storage, and environmental remediation are also discussed. Key challenges and further research needs are proposed at the end.

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Section: Energy and Environmental Applications Of Bm-cnmsmentioning

confidence: 99%

Ball-Milled Carbon Nanomaterials for Energy and Environmental Applications

Lyu

Gao

et al. 2017

ACS Sustainable Chem. Eng.

228

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“…Theoretical prediction suggested that the addition of TM to MgH 2 could weaken the bond between Mg and H, which made the doped TM-MgH 2 systems unstable and leaded to the decreasing of their desorption temperatures (El Khatabi et al, 2016). Zhang et al (2015) reported that the dehydrogenation enthalpy and the dehydrogenation activation energy of MgH 2 can be decreased by doping with grapheme. Doping MgH 2 with TiO 2 @C composites can elongate the lengths and weaken the strengths for Mg-H bond, resulting in the decrease of the hydrogenation/dehydrogenation temperature of the MgH 2 -TiO 2 @C system (Zhang et al, 2018).…”

Section: Characterizationmentioning

confidence: 99%

Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

et al. 2020

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To improve the hydrogen storage properties of Mg/MgH 2 , a Ni and TiO 2 co-doped reduced graphene oxide [(Ni-TiO 2)@rGO] nanocomposite is synthesized by a facile impregnation method and introduced into Mg via ball milling. The results demonstrated that the dispersive distribution of Ni and TiO 2 with a particle size of 20-200 nm in the reduced graphene oxide matrix led to superior catalytic effects on the hydrogen storage properties of Mg-(Ni-TiO 2)@rGO. The initial hydrogenation/dehydrogenation temperature for Mg-(Ni-TiO 2)@rGO decreased to 323/479 K, 75/84 K lower than that of the additive-free sample. The hydrogen desorption capacity of the Mg-(Ni-TiO 2)@rGO composite released 1.47 wt.% within 120 min at 498 K. When the temperature was increased to 523 K, the hydrogen desorption capacity increased to 4.30 wt.% within 30 min. A hydrogenation/dehydrogenation apparent activation energy of 47.0/99.3 kJ•mol −1 was obtained for the Mg-(Ni-TiO 2)@rGO composite. The improvement in hydrogenation and dehydrogenation for the Mg-(Ni-TiO 2)@rGO composite was due to the reduction of the apparent activation energy by the catalytic action of (Ni-TiO 2)@rGO.

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“…Lukashev et al ( Lukashev et al, 2006 ) prepared a Mg−C composite and demonstrated that MgH 2 was destabilized and the hydrogen dehydrogenation and rehydrogenation kinetics were improved. Another work by Zhang et al (2015) showed that addition of 10 wt.% graphene significantly enhances the dehydrogenation thermodynamics and kinetics of MgH 2 . Similar results were also reported by Imamura et al (1999) .…”

Section: Introductionmentioning

confidence: 99%

Co-Addition of Mg2Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

et al. 2021

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Mg−Li alloy possesses a high hydrogen capacity. However, the hydrogenation and dehydrogenation performances are still far from practical application. In this work, Mg2Si (MS) and graphene (G) were employed together to synergistically improve the hydrogen storage properties of Mg−Li alloy. The structures of the samples were studied by XRD and SEM methods. The hydrogen storage performances of the samples were studied by nonisothermal and isothermal hydrogenation and dehydrogenation, thermal analysis, respectively. It is shown that the onset dehydrogenation temperature of Mg−Li alloy was synergistically reduced from 360°C to 310°C after co-addition of Mg2Si and graphene. At a constant temperature of 325°C, the Mg−Li−MS−G composite can release 2.7 wt.% of hydrogen within 2 h, while only 0.2 wt.% of hydrogen is released for the undoped Mg−Li alloy. The hydrogenation activation energy of the Mg−Li−MS−G composite was calculated to be 86.5 kJ mol−1. Microstructure and hydrogen storage properties studies show that graphene can act as a grinding aid during the ball milling process, which leads to a smaller particle size for the composites. This work demonstrates that coaddition of Mg2Si and graphene can synergistically improve the hydrogen storage properties of Mg−Si alloy and offers an insight into the role of graphene in the Mg−Li−MS−G composite.

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Influences and mechanisms of graphene-doping on dehydrogenation properties of MgH2: Experimental and first-principles studies

Cited by 51 publications

References 27 publications

Ball-Milled Carbon Nanomaterials for Energy and Environmental Applications

Ball-Milled Carbon Nanomaterials for Energy and Environmental Applications

Enhanced Hydrogen Storage Properties of MgH2 Using a Ni and TiO2 Co-Doped Reduced Graphene Oxide Nanocomposite as a Catalyst

Co-Addition of Mg2Si and Graphene for Synergistically Improving the Hydrogen Storage Properties of Mg−Li Alloy

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