Enhanced hydrogen selectivity from catalytic decomposition of formic acid over FeZnIr nanocatalyst at room temperature

Azizi, Masitah Abdul Halim; Isahak, Wan Nor Roslam Wan; Masdar, Mohd Shahbudin; Somalu, Mahendra Rao; Yarmo, Mohd Ambar

doi:10.1007/s11164-018-3522-x

Cited by 11 publications

(4 citation statements)

References 33 publications

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“…A better dispersion of PtNi particles can also be seen in Figure 4A compared with those of the PtFe and PtCo particles, which they stick to each other on their supports. It may be due to sintering phenomena which contribute to the less reactivity of the catalysts 40 . In addition, there was a slightly agglomeration of PtCo particles detected on the carbon support, as shown in Figure 4D; the agglomerate formation may be caused by the overuse of sodium hydroxide solution that was used for pH adjustment during catalyst deposition on the support.…”

Section: Resultsmentioning

confidence: 99%

“…It may be due to sintering phenomena which contribute to the less reactivity of the catalysts. 40 In addition, there was a slightly agglomeration of PtCo particles detected on the carbon support, as shown in Figure 4D; the agglomerate formation may be caused by the overuse of sodium hydroxide solution that was used for pH adjustment during catalyst deposition on the support. The average carbon particle size in this experiment ranged from 110 to 130 nm, which is nanosized.…”

Section: Electrocatalyst Characterizationsmentioning

confidence: 97%

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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: Resultsmentioning

confidence: 99%

Section: Electrocatalyst Characterizationsmentioning

confidence: 97%

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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“…The presence of Zn in the catalyst also reduced the poisoning, as shown by the I f /I b value of the Ir 50 Zn 50 /GNP catalyst. The considerable improvement of the electrochemical performance may be attributed to the ensemble effect by the addition of Zn to the Ir catalyst [38,39]. The ensemble effect could be described by the adsorption of the Zn atoms to Ir sites, which promoted the formic acid oxidation through the direct pathway.…”

Section: Discussion On the Promoting Effect Of Zinc Metalmentioning

confidence: 99%

Improving the electrocatalytic activity for formic acid oxidation of bimetallic Ir–Zn nanoparticles decorated on graphene nanoplatelets

Azam

Isahak

Zainoodin

et al. 2020

Mater. Res. Express

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A graphene nanoplatelet (GNP)-supported Ir-Zn catalyst (Ir-Zn/GNP) was fabricated by H 2 reduction to discover an alternative for non-platinum and non-palladium catalysts as an anode catalyst in direct formic acid fuel cell (DFAFC). The obtained Ir-Zn/GNP catalyst with ratio of Ir: Zn=50:50 (Ir 50 Zn 50 /GNP) exhibited better electrocatalytic activity than GNP-supported iridium catalyst (Ir/GNP) for formic acid oxidation. Although the oxidation peak current density of Ir50Zn50/GNP was slightly lower than that of Ir/GNP, the oxidation peak potential shifted more negatively (193 mV) than Ir/GNP with higher value of the ratio of forward scan to reverse the scan peak current (If/Ib). The presence of Zn also enhanced the power density and current generation with increased performance stability in a passive DFAFC cell tests. The improvement of the electrochemical performance was ascribed to the ensemble effect where the addition of Zn could modify the Ir atom arrangement, thereby promoting the oxidation through dehydrogenation pathway. However, extremely high Zn content would inhibit oxidation capability because Zn atoms might reduce the Ir catalytic sites. A new alternative for non-Pt and non-Pd anode catalysts for DFAFC applications was successfully achieved.

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“…Olefins can be produced from natural gas polymerization, steam cracking, or dehydrogenation of hydrocarbon. Previous works on CO 2 conversion into hydrocarbons have been reported in previous works . The combination of more than one active sites on the heterogeneous catalyst responsible for different functionalities contributes to the C2‐C4 formation at a moderate temperature of approximately 300°C.…”

Section: Hydrogenation Mechanismmentioning

confidence: 97%

Clean hydrogen generation and storage strategies via CO ₂ utilization into chemicals and fuels: A review

et al. 2019

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Summary Hydrogen becomes one of the most clean energy sources. The major issues on hydrogen are lack of practical clean and high‐temperature processes and possible practical storage of clean hydrogen. An energy intensive of clean hydrogen storage via chemical and liquid fuel production route is the current demand. This article reviewed the most recent research for hydrogen (H2) production by using several methods, such as thermochemical process, thermal decomposition, biological approaches, electrolysis, and photocatalytic method. H2 storage types, including physical and chemical approaches, were also reviewed. The produced H2 was stored as valuable chemicals and fuels via CO2 hydrogenation reaction. Reactor designs are the illustrated number of design ranging from the fixed bed to the continuous stirred tank reactor. Catalyst type, catalytic system, and the related mechanism of CO2 hydrogenation reaction to form alcohol, alkanes, and carboxylic acid were also discussed in detail.

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Enhanced hydrogen selectivity from catalytic decomposition of formic acid over FeZnIr nanocatalyst at room temperature

Cited by 11 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

Improving the electrocatalytic activity for formic acid oxidation of bimetallic Ir–Zn nanoparticles decorated on graphene nanoplatelets

Clean hydrogen generation and storage strategies via CO ₂ utilization into chemicals and fuels: A review

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Enhanced hydrogen selectivity from catalytic decomposition of formic acid over FeZnIr nanocatalyst at room temperature

Cited by 11 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

Improving the electrocatalytic activity for formic acid oxidation of bimetallic Ir–Zn nanoparticles decorated on graphene nanoplatelets

Clean hydrogen generation and storage strategies via CO 2 utilization into chemicals and fuels: A review

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Product

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Clean hydrogen generation and storage strategies via CO ₂ utilization into chemicals and fuels: A review