Enhanced hydrogen spillover to fullerene at ambient temperature

Nishihara, Hirotomo; Simura, Tomoya; Kyotani, Takashi

doi:10.1039/c8cc00265g

Cited by 26 publications

(18 citation statements)

References 21 publications

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“…1108 Fullerenes C60 constituted excellent acceptors or bridges that promotes the spillover, and the strength of the H-C60 interaction is in between physisorption and chemisorption. 1109 Primary and secondary spillovers in a Pt/CB/C60 composite are sketched on Figure 47b. Although spillover has been regularly invoked in the literature to rationalize catalytic results involving carbon-supported catalysts, particularly for hydrogenation reactions, relatively few specific studies have been published.…”

Section: Hydrogen Spillovermentioning

confidence: 99%

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

2019

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Fermi level in vii) are shown in purple in ii)-vi) with an iso-value of ±0.003 a.u. Reprinted with permission from ref 57 . Copyright 2014 from the Royal Society of Chemistry; b) Molecular model of a corannulene-like element functionalized with three carboxylic groups from two different perspectives in the cpk representation (on the left). The final structure (190 elements in a cubic cell of 60 Å in size) obtained from random packing of the individual elements (on the right). Cyan: carbon, red: oxygen, white: hydrogen. Reprinted with permission from ref 59 Copyright 2017 from Elsevier; c) Side-views of Ru13 adsorbed on Gr-DV-2COOH site before (on left panel) and after a proton jump (right panel). C atoms are in black, O in red, H in with white and Ru in mocha. Reprinted with permission from ref 60 Copyright 2014 from Elsevier; and d) Spin-density projection in µB/a.u. 2 on the graphene plane around i) the hydrogen chemisorption defect (∆) and ii) the vacancy defect in the a sublattice. Carbon atoms corresponding to the a sublattice (o) and to the b sublattice (•) are distinguished. Simulated STM images of the defects are shown in iii) and iv), respectively. Reprinted with permission from ref 61 .

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Section: Hydrogen Spillovermentioning

confidence: 99%

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

2019

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“…Additionally, the C60 nanoparticles increased the specific surface area and possibly caused hydrogen spillover. Nishihara et al (Nishihara et al, 2018) measured hydrogen adsorption-desorption isotherms at 273, 298, 323, and 353 K for ketjenblack, which was prepared as a carbon support, loaded with Pt and C60 nanoparticles (C60-Pt/KB). The isotherms of C60-Pt/KB showed intense hysteresis and increased adsorption at higher measurement temperatures.…”

Section: Mechanisms Of Enhanced Hydrogen Storage In Mgmentioning

confidence: 99%

Enhanced hydrogen storage properties of ball-milled Mg with C<sub>60</sub> and Fe

TARUI

Notomi

2022

Mechanical Engineering Journal

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Mg-based materials with added C60 and/or Fe, i.e., Mg-C60, Mg-Fe and Mg-C60-Fe, were prepared by ball milling. We also added stearic acid (SA) as a process control agent to Mg-Fe + SA and Mg-C60-Fe + SA. We investigated the effects of C60, Fe and stearic acid on the hydrogen storage properties of Mg by X-ray diffraction (XRD), morphology observation, differential scanning calorimetry and pressure-composition-temperature measurements using Sievert apparatus under lower hydrogen pressure (<1.0 MPa). Morphology observation revealed that the particles of Mg-Fe + SA, Mg-C60-Fe and Mg-C60-Fe + SA were less agglomerated than Mg-Fe, and also nanoparticles of C60 were formed on the surface of the C60-added samples. We observed MgO in the as-milled samples of Mg-Fe + SA and Mg-C60-Fe + SA, and MgH2 in all the Fe-added samples after hydrogenation at 280℃ under a hydrogen pressure of 0.99 MPa with XRD analysis. The Fe-added samples released hydrogen at temperatures 71-152°C lower than commercial MgH2 in DSC analysis. The hydrogen storage capacities of Mg-Fe + SA and Mg-C60-Fe + SA were 2.93 wt.% and 2.42 wt.%, respectively, and they did not release hydrogen at 280°C even the equilibrium pressure as below 0.1 MPa. On the other hand, Mg-Fe and Mg-C60-Fe absorbed hydrogen up to 2.57 wt.% and 3.10 wt.%, respectively, and released hydrogen at 280°C and about 0.1 MPa. The Fe had a catalytic effect on Mg, and stearic acid oxidized Mg during ball milling, although it refined the particles. In contrast, C60 inhibited agglomeration without oxidizing Mg and dispersed Fe finely on it, and also increased specific surface area by the nanoparticles provided the more active sites for hydrogenation. The co-addition of C60 and Fe exhibit the synergetic effects in enhancing the hydrogen storage properties of Mg.

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“…Activated carbons have been used in a variety of practical applications such as water treatment, deodorant, canisters of automobiles, air separation, catalyst supports, supercapacitors, and medicine. While activated carbons have advantages of high surface area (1000-3000 m 2 g -1 ) and relatively low production cost, porous carbon blacks [43][44][45][46][47][48] have been also practically used from their superior electric conductivity despite their lower surface area (300-1500 m 2 g -1 ). For example, Ketjen black (KB, Fig.…”

Section: Introductionmentioning

confidence: 99%

Adsorption properties of templated nanoporous carbons comprising 1–2 graphene layers

et al. 2022

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A variety of vapor adsorption (water, methanol, ethanol, dichloromethane, and n-hexane) is examined on templated nanoporous carbons consisting of 1-2 graphene layers including microporous zeolite-templated carbon (ZTC), mesoporous carbon mesosponge (CMS) and graphene mesosponge (GMS). Conventional nanoporous carbon materials are used as references. While water-vapor adsorption is peculiar because of the repulsion between H2O molecules and hydrophobic carbon, organic-vapor adsorption basically follows the mechanism of typical physisorption. The graphene-based nanoporous materials exhibit a noticeable degree of adsorption-induced expansion from their extraordinary softness except the case of inferior water-vapor adsorption on mesoporous CMS and GMS. CMS exhibits an especially large degree of adsorption-induced expansion, and achieved very high adsorption capacities up to 4.25-4.76 cm 3 g -1 for organic vapors, demonstrating its feasibility as a high-capacity adsorbent. The adsorption isotherms of ZTC at 278 K and 298 K for n-hexane are overlapping well, and it is advantageous for a new type of heat pump working with force-induced phase transition. Moreover, this work provides a general prediction of the ease of organic-vapor adsorption by the product of surface tension and molar volume.

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Enhanced hydrogen spillover to fullerene at ambient temperature

Cited by 26 publications

References 21 publications

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

A Theory/Experience Description of Support Effects in Carbon-Supported Catalysts

Enhanced hydrogen storage properties of ball-milled Mg with C<sub>60</sub> and Fe

Adsorption properties of templated nanoporous carbons comprising 1–2 graphene layers

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