Hydrogen storage performance of palladium nanoparticles decorated graphitic carbon nitride

Nair, Asalatha; Ramaprabhu, Sundara; Anitha, N.

doi:10.1016/j.ijhydene.2014.12.065

Cited by 96 publications

(44 citation statements)

References 33 publications

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“…From a BET analysis, the amount of adsorbed species and the degree of adsorption on the adsorbent surface could be investigated. 42 An adsorption/ desorption analysis of nitrogen isotherms was conducted at 77 K to analyze the electrocatalyst surface area and porosity. From the linear isotherm graphs ( Figure 5), a flat pattern at a relatively low-pressure area P/P o ≤ 0.8 is observed.…”

Section: Electrocatalyst Characterizationsmentioning

confidence: 99%

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The potential of novel carbon nanocages as a carbon support for an enhanced methanol electro‐oxidation reaction in a direct methanol fuel cell

et al. 2020

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In this study, we introduce the potential for a new catalyst support, namely, carbon nanocages (CNCs) for anodic direct methanol fuel cell (DMFC). The synthesis, characterization and catalytic activities of four electrocatalysts, PtRu/CNC, PtNi/CNC, PtFe/CNC and PtCo/CNC, have been investigated. These electrocatalysts are synthesized using pyrolysis, followed by a microwave-assisted ethylene glycol reduction method. From X-ray diffraction analysis, PtNi/CNC and PtRu/CNC showed the smallest crystallite particle size of Pt-alloy, which corresponded to the (111) plane. The Raman spectra confirmed the presence of the carbon support material in all prepared electrocatalysts. The ratio value of the D band and G band (I D /I G) of all prepared samples was not much different within the electrocatalyst and CNC. The I D /I G values calculated for the CNC, PtNi/CNC, PtRu/CNC, PtCo/CNC and PtFe/ CNC electrocatalysts were 0.90, 0.89, 0.83, 0.78 and 0.77, respectively. Therefore, the number of defects of graphitization in increasing order (I D /I G) was PtFe/CNC < PtCo/CNC < PtRu/CNC < PtNi/CNC < CNC. Brunauer-Emmett-Teller analysis revealed that the CNC support has a mesoporous-type structure with a high surface area of 416 m 2 g −1 , which indicates that this support has a high potential to act as an excellent catalyst support. From the cyclic voltammetry curve, PtRu/CNC showed the highest catalytic activity in methanol electro-oxidation and reached a value of 427 mA mg −1 , followed by PtNi/ CNC (384.11 mA mg −1), PtCo/CNC (150.53 mA mg −1) and PtFe/CNC (144.11 mA mg −1). PtFe/CNC exhibited a higher ratio value of I f /I b (3.24) compared with PtRu/CNC (2.34), PtNi/CNC (1.43) and PtCo/CNC (1.62). These values show that the combination of Pt and Fe catalysts in PtFe/CNC had better CO tolerance than PtRu/CNC, PtNi/CNC and PtCo/CNC electrocatalysts. The higher performance of PtRu/CNC was attributed to the fact that it had the smallest bimetallic-Pt crystallite; there was a smooth distribution of bimetallic-Pt on its CNC support, as shown by field emission scanning electron microscopy; it had the highest electrochemical surface area value (16.23 m 2 g −1); and

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Section: Electrocatalyst Characterizationsmentioning

confidence: 99%

“…61,62 As in passive mode the flow rate of methanol fuel cannot be controlled, the tank is already mixed with methanol by-products and these molecules can block the GDL and reduce the performance of a DMFC. 42…”

Section: Electrochemical Evaluationmentioning

confidence: 99%

The potential of novel carbon nanocages as a carbon support for an enhanced methanol electro‐oxidation reaction in a direct methanol fuel cell

et al. 2020

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“…On the other hand, the prepared electrocatalyst showed the pore size was in mesopores size in range of 5.6-39.3 nm. The mesopores size has advantage which demonstrates good morphology stability and could increase the level of distribution and homogeneity of the immobilized catalyst, resulting improving in stability and catalytic activity due to increase of adsorption volume [50]. The smaller pore volume of Pt-Ru/CNC electrocatalyst compared to their CNC support, due to some porous space in carbon cages support media was blocked with catalyst particles or may other chemical reaction take place during the process of nanoparticle decoration and, subsequently resulted in the decrease of the pore volume.…”

Section: Materials Characterizationmentioning

confidence: 99%

Synthesis, Characterization and Potential of Pt-Ru Supported Carbon Nanocage (CNC) Electrocatalystfor Future DMFC

Ramli¹,

Kamarudin²,

Zainoodin³

et al. 2019

IJIE

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A new type of support which is carbon nanocage (CNC) has been introduced and synthesized by pyrolysis method using MgO metal as the template of CNC. Three types of polymers which are PANi, PPy and PVAc have been chosen as carbon source for the CNC production that synthesized at temperature range of 600-900 o C, under N2 gas flow. All synthesized CNCs were characterized using TEM analysis to study their morphologies. From TEM characterization, the best CNC will be doped with Pt-Ru catalyst for the electrochemical test and DMFC performance. Based on XRD analysis, the estimated particle size of Pt-Ru/CNC obtained is smaller than commercial carbon black support, Pt-Ru/C. In BET analysis, the surface area of CNC support and Pt-Ru/CNC are 416 m 2 g-1 and 154.53 m 2 g-1 respectively, which consider a high surface area and good property as a catalyst. In electrochemical evaluation of cyclic voltammetry, the Pt-Ru/CNC electrocatalyst shows higher electrochemical surface active (ECSA) value than Pt-Ru/C, which are 16.9 m 2 g-1 and 6.2 m 2 g-1 , respectively. This result indicates that the ECSA value of Pt-Ru/CNC 1.7 times larger than Pt-Ru/CNC. Meanwhile, from the DMFC-single cell test, the Pt-Ru/CNC with 40 % (catalyst wt. %) achieved more than 6.0 mW cm-2 of power density performance, which is higher than the Pt-Ru/C. These results can be attributed to the high BET surface area of CNC support and Pt-Ru on CNC support. It can be concluded that Pt-Ru supported CNC is a superior candidate for future DMFC anode electrocatalyst.

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“…2016, 11,3305 -3328 www.chemasianj.org method, prepared palladium NP modified g-C 3 N 4 (Pd/g-C 3 N 4 ), and further compared it with pure g-C 3 N 4 to explore the hydrogen storage capacity. [162] The good dispersion of palladium NPs enhanced the interaction between palladium NPs and g-C 3 N 4 ,w hich catalyzedt he dissociation of hydrogen molecular and the hydrogen atoms subsequently migrated to g-C 3 N 4 through the spillover mechanism. It can be deduced that the relationship between metal NPs and g-C 3 N 4 led to the high hydrogen absorption capacity.C ompared with that of pure g-C 3 N 4 (3.4 wt %), the hydrogen storage capacity of Pd/g-C 3 N 4 was enhanced to 35 wt %a saresulto fp alladium NPs and good mesoporous texture.…”

Section: Hydrogen Storagementioning

confidence: 99%

Metal/Graphitic Carbon Nitride Composites: Synthesis, Structures, and Applications

Wang

et al. 2016

Chemistry An Asian Journal

111

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Graphitic carbon nitride (g-C N ) has been widely used in fields related to energy and materials science. However, nanostructured g-C N photocatalysts synthesized by traditional thermal polycondensation methods have the disadvantage of small specific surface areas and wide band gaps; these limit the catalytic activity and application range of g-C N . Based on the unique nanostructure of g-C N , it is a feasible method to modify g-C N with metals to design novel metal-semiconductor composites. Metals alter the photochemical properties of g-C N , in particular, narrow the band gap and expand photoabsorption into the visible range, which improves the photocatalytic performance. This review covers recent progress in metal/g-C N nanocomposites for photocatalysts, organic systems, biosensors, and so on. The aim is to summarize the synthetic methods, nanostructures, and applications of metal/g-C N nanocomposite materials, as well as discuss future research directions in these areas.

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Hydrogen storage performance of palladium nanoparticles decorated graphitic carbon nitride

Cited by 96 publications

References 33 publications

The potential of novel carbon nanocages as a carbon support for an enhanced methanol electro‐oxidation reaction in a direct methanol fuel cell

The potential of novel carbon nanocages as a carbon support for an enhanced methanol electro‐oxidation reaction in a direct methanol fuel cell

Synthesis, Characterization and Potential of Pt-Ru Supported Carbon Nanocage (CNC) Electrocatalystfor Future DMFC

Metal/Graphitic Carbon Nitride Composites: Synthesis, Structures, and Applications

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