Hydrogen production and storage—Investigation of Hf-based intermetallics

Stojić, Dragica Lj.; Kumrić, Sandra V.; Grozdić, Tomislav D.; Koteski, V.; Cekić, B.

doi:10.1016/j.jpowsour.2009.01.064

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…The compounds Hf 2 Fe, Hf 2 Co, and Hf 2 Ni were investigated as possible hydrogen storage materials, and their application as electrode materials was also mentioned, but no details were published. 39 The limited application of Hf-based compounds (e.g., diboride) can be related to their restricted chemical stability in acidic media. 40 Addressing the knowledge about the application of borides for the OER, a few important issues need to be highlighted: (i) borides are known as active and stable electrocatalysts for the OER only (!)…”

Section: ■ Introductionmentioning

confidence: 99%

“…Nevertheless, during the last few decades, they have attracted interest as electrocatalysts for other half-reactions of water splitting: e.g., HfO x N y (acidic ORR, HER, and HOR), HfB 2 (acidic HER and alkaline ORR), and solid solution HfB 2 -ZrB 2 (acidic and alkaline HER). The compounds Hf 2 Fe, Hf 2 Co, and Hf 2 Ni were investigated as possible hydrogen storage materials, and their application as electrode materials was also mentioned, but no details were published . The limited application of Hf-based compounds (e.g., diboride) can be related to their restricted chemical stability in acidic media …”

Section: Introductionmentioning

confidence: 99%

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Hf₂B₂Ir₅: A Self-Optimizing Catalyst for the Oxygen Evolution Reaction

Jimenez

Burkhardt

Cardoso‐Gil

et al. 2020

ACS Appl. Energy Mater.

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The ternary compound Hf 2 B 2 Ir 5 was assessed as an electrocatalyst for the oxygen evolution reaction (OER) in 0.1 M H 2 SO 4 . The oxidative environment restructures the studied material in the near-surface region, creating cavities in which agglomerates of IrO x (OH) y (SO 4 ) z particles are incorporated. These in situ generated particles result from the oxidation of secondary phases in the matrix as well as from self-controlled near-surface oxidation of the ternary compound itself. The oxidation is controlled by the structural and chemical bonding features of Hf 2 B 2 Ir 5 . The cage-like motif, exhibiting mostly ionic interactions between positively charged Hf atoms and a covalently bonded Ir−B network, selectively controls the extent and kinetics of the transformation process induced during the operation of the electrocatalyst. The resulting self-optimized composite material, formed by a Hf 2 B 2 Ir 5 matrix surrounding IrO x (OH) y (SO 4 ) z particles, was used in the OER over 240 h at 100 mA cm −2 current density. The chemical changes, as well as the OER performance, were studied via a combination of bulk-and surface-sensitive experimental techniques as well as by employing a quantum-chemical bonding analysis.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hf₂B₂Ir₅: A Self-Optimizing Catalyst for the Oxygen Evolution Reaction

Jimenez

Burkhardt

Cardoso‐Gil

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…Furthermore, the binding energy varies depending on whether or not these bondings are formed with the participation of 3d, 4d and 5d electrons and increases in 3d<4d<5d order so that the connections like Zr-Pt are much more stable than the Ti-Pt ones. Ti-Ni, Zr-Ni, Mo-Ni, Mo-Co, Hf-Pd, Pt-Mo, W-Pt and Zr-Pt are typical configurations abiding by the described dependences [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Catalytic Activity Of Intermetallic Compounds In the Hermentioning

confidence: 90%

“…Intermetallic phases are characterized by the fact that crystalline lattice is different from the lattice of elements that it is made of as well as by the fact that atoms occupy certain positions in the lattice. Catalytic activity of such combinations is much higher than the activity of individual components as well as the activity of precious metals [4][5][6][7][8][9][10][11][12]. It was therefore concluded that when choosing alloy components the electronic structure of metals plays a fundamental role.…”

Section: Introductionmentioning

confidence: 99%

Intermetallic Compounds as Catalysts in the Reaction of Electroevolution/Absorption of Hydrogen

Łosiewicz

Popczyk

Napłoszek

et al. 2015

SSP

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This work deals with selected aspects of the formation of intermetallic phases and the occurrence of a synergistic effect in the electrochemical process taking place at such electrode materials. A comparison of the catalytic activity of a variety of metals and intermetallic compounds in the reaction of hydrogen electroevolution and absorption was carried out. It has been found that the catalytic activity of such combinations is much higher than the activity of their individual components and quite often also of precious metals. This paper is also aimed at understanding the electrocatalytic properties of electrodes based on the concept of “activity descriptors”. What is also discussed is the ability of different metals and intermetallic compounds to store hydrogen.

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“…In the past, many methods such as fossil fuel reforming [9][10][11], water electrolysis [12,13], photocatalysis [14,15], and biological H 2 generation [16,17] have been developed to produce H 2 , but these methods have some disadvantages such as low conversion efficiency, high costs, and environmental pollution. The second problem is H 2 transportation with difficult storage and transportation costs [18,19]. Therefore, it is necessary to find new methods for H 2 generation.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Hydrogen Generation Performance of Al-Rich Alloys by a Melting-Mechanical Crushing-Ball Milling Method

et al. 2021

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The main problem for the application of hydrogen generated via hydrolysis of metal alloys is the low hydrogen generation rate (HGR). In this paper, active Al alloys were prepared using a new coupled method-melting-mechanical crushing-mechanical ball milling method to enhance the HGR at room temperature. This method contains three steps, including the melting of Al, Ga, In, and Sn ingots with low melting alloy blocks and casting into plates, then crushing alloy plate into powders and ball milling with chloride salts such as NiCl2 and CoCl2 were added during the ball milling process. The microstructure and phase compositions of Al alloys and reaction products were investigated via X-ray diffraction and scanning electron microscopy with energy dispersed X-ray spectroscopy. The low-melting-point Ga-In -Sn (GIS) phases contain a large amount of Al can act as a transmission medium for Al, which improves the diffusion of Al to Al/H2O reaction sites. Finer GIS phases after ball milling can further enhance the diffusion of Al and thus enhance the activity of Al alloy. The hydrogen generation performance through hydrolysis of water with Al at room temperature was investigated. The results show that the H2 generation performance of the Al-low-melting point alloy composite powder is significantly higher than the results reported to date. The highest H2 generation rate and H2 conversion efficiency can reach 5337 mL·min−1·g−1 for the hydrolysis of water with 1 g active alloy.

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Hydrogen production and storage—Investigation of Hf-based intermetallics

Cited by 5 publications

References 15 publications

Hf₂B₂Ir₅: A Self-Optimizing Catalyst for the Oxygen Evolution Reaction

Hf₂B₂Ir₅: A Self-Optimizing Catalyst for the Oxygen Evolution Reaction

Intermetallic Compounds as Catalysts in the Reaction of Electroevolution/Absorption of Hydrogen

Enhanced Hydrogen Generation Performance of Al-Rich Alloys by a Melting-Mechanical Crushing-Ball Milling Method

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Hydrogen production and storage—Investigation of Hf-based intermetallics

Cited by 5 publications

References 15 publications

Hf2B2Ir5: A Self-Optimizing Catalyst for the Oxygen Evolution Reaction

Hf2B2Ir5: A Self-Optimizing Catalyst for the Oxygen Evolution Reaction

Intermetallic Compounds as Catalysts in the Reaction of Electroevolution/Absorption of Hydrogen

Enhanced Hydrogen Generation Performance of Al-Rich Alloys by a Melting-Mechanical Crushing-Ball Milling Method

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Hf₂B₂Ir₅: A Self-Optimizing Catalyst for the Oxygen Evolution Reaction

Hf₂B₂Ir₅: A Self-Optimizing Catalyst for the Oxygen Evolution Reaction