Magic of hydrogen spillover: Understanding and application

Shen, Haifang; Li, Hao; Yang, Zhensheng; Li, Chunli

doi:10.1016/j.gee.2022.01.013

Cited by 128 publications

(76 citation statements)

References 345 publications

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“…Correct understanding of interfacial phenomena occurring during hydrogen storage is now termed as hydrogen spillover effect (HSPE). First discovered in 1964, it describes the migration of hydrogen atoms produced by H 2 decomposition on an active site, and it allows for a more insightful view on the dynamic behavior of hydrogen in energy storage materials [7]. While molecular orbital energy computations showed unfavorable energy for H atom spillover on non-reducible supports, recent studies have shown that HSPE is indeed possible on inert supports such as siloxanic materials (SiO 2 ) [7].…”

Section: Characterization Methods: Old New and Their Pitfallsmentioning

confidence: 99%

“…First discovered in 1964, it describes the migration of hydrogen atoms produced by H 2 decomposition on an active site, and it allows for a more insightful view on the dynamic behavior of hydrogen in energy storage materials [7]. While molecular orbital energy computations showed unfavorable energy for H atom spillover on non-reducible supports, recent studies have shown that HSPE is indeed possible on inert supports such as siloxanic materials (SiO 2 ) [7]. This bears a direct effect on hydrogen storage materials such as metal hydrides confined in mesoporous silica supports, where the spillover distance is limited to very short distances of ~10 nm [7].…”

Section: Characterization Methods: Old New and Their Pitfallsmentioning

confidence: 99%

“…While molecular orbital energy computations showed unfavorable energy for H atom spillover on non-reducible supports, recent studies have shown that HSPE is indeed possible on inert supports such as siloxanic materials (SiO 2 ) [7]. This bears a direct effect on hydrogen storage materials such as metal hydrides confined in mesoporous silica supports, where the spillover distance is limited to very short distances of ~10 nm [7].…”

Section: Characterization Methods: Old New and Their Pitfallsmentioning

confidence: 99%

“…+85 • C, a delivery pressure of five bar, a very fast refill time (3-5 min) and a high purity hydrogen production of 99.97% [4][5][6]. Broadly speaking, the hydrogen storage methods are divided in physisorption-based (fast kinetics, storage capacity dependent on support surface area and pore volume, weak Van der Waals interatomic forces) and chemisorption-based (somewhat slower kinetics of desorption/absorption, storage depends on chemical composition of the material, strong chemical bonds) [7,8]. The chemisorption method is the preferred one of the two, as it binds hydrogen through chemical bonds rather than weaker interatomic forces therefore ensuring a reliable hydrogen storage capacity and comprise of metal hydrides, tetrahydridoborates, tetrahydridoaluminates and metal amides.…”

Section: Introductionmentioning

confidence: 99%

“…Among hydrogen storage materials, metal hydrides have gained increased popularity [5][6][7][8][22][23][24][25][26] and channeled many research groups to corroborate hydrogen sorption data to formulate general design principles for these materials [27,28], or to tackle the imminent need to expand current knowledge to production of large-scale hydrogen storage facilities [29]. While many advances have been made in the field of metal hydrides for hydrogen storage applications, the high thermal stability, sluggish kinetics and poor reversibility of hydrogen release/uptake have shifted researchers' attention towards nanoconfined hydrides that seem to alleviate some of these drawbacks, affording reversible, high gravimetric and volumetric hydrogen content at moderate temperatures [8,24,25].…”

Section: Introductionmentioning

confidence: 99%

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Recent Development in Nanoconfined Hydrides for Energy Storage

Comănescu

2022

IJMS

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Hydrogen is the ultimate vector for a carbon-free, sustainable green-energy. While being the most promising candidate to serve this purpose, hydrogen inherits a series of characteristics making it particularly difficult to handle, store, transport and use in a safe manner. The researchers’ attention has thus shifted to storing hydrogen in its more manageable forms: the light metal hydrides and related derivatives (ammonia-borane, tetrahydridoborates/borohydrides, tetrahydridoaluminates/alanates or reactive hydride composites). Even then, the thermodynamic and kinetic behavior faces either too high energy barriers or sluggish kinetics (or both), and an efficient tool to overcome these issues is through nanoconfinement. Nanoconfined energy storage materials are the current state-of-the-art approach regarding hydrogen storage field, and the current review aims to summarize the most recent progress in this intriguing field. The latest reviews concerning H2 production and storage are discussed, and the shift from bulk to nanomaterials is described in the context of physical and chemical aspects of nanoconfinement effects in the obtained nanocomposites. The types of hosts used for hydrogen materials are divided in classes of substances, the mean of hydride inclusion in said hosts and the classes of hydrogen storage materials are presented with their most recent trends and future prospects.

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Section: Characterization Methods: Old New and Their Pitfallsmentioning

confidence: 99%

Section: Characterization Methods: Old New and Their Pitfallsmentioning

confidence: 99%

Section: Characterization Methods: Old New and Their Pitfallsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent Development in Nanoconfined Hydrides for Energy Storage

Comănescu

2022

IJMS

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Hydrogen Spillover Mechanism of Superaerophobic NiSe₂‐Ni₅P₄ Electrocatalyst to Promote Hydrogen Evolution in Saline Water

Jiang,

Xu,

Gong

et al. 2024

Adv Funct Materials

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The hydrogen spillover mechanism of metal‐supported electrocatalyst can significantly improve HER activity. However, the rational design of binary heterojunction hydrogen spillover electrocatalysts remains a challenge. Here, a NiSe2‐Ni5P4 heterojunction electrocatalyst with superaerophobic structure is synthesized by using a simple substrate self‐derived strategy. Experimental characterization and theoretical calculation reveal the hydrogen spillover mechanism of NiSe2‐Ni5P4 heterogeneous electrocatalyst. NiSe2 and Ni5P4 synergistically promote the adsorption/dissociation of H2O and the adsorption of H*, respectively. The smaller ΔΦ effectively reduced the electron density at the interface, weakening the proton adsorption at the interface and promoting the migration of H* from NiSe2 to Ni5P4. The NiSe2‐Ni5P4 exhibits excellent HER activity in alkaline electrolyte, requiring only a potential of 65, 270 mV to achieve a current density of 10, 500 mA cm−2, respectively, and a stability of up to 200 h. Moreover, the design of NiSe2‐Ni5P4 with superaerophobic structure can reduce the deposition of impurity ions on the electrode surface and avoid Cl− corrosion of the electrode, which results in NiSe2‐Ni5P4 showing better HER activity and stability than commercial Pt/C in brackish water. This study deepens the understanding of hydrogen spillover mechanism of binary heterojunction electrocatalysts, broadens the application of hydrogen production in complex water quality.

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Catalysis Sans Catalyst Loss: The Origins of Prolonged Stability of Graphene–Metal–Graphene Sandwich Architecture for Oxygen Reduction Reactions

Abdelhafiz,

Choi,

Zhao

et al. 2023

Advanced Science

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Over the past decades, the design of active catalysts has been the subject of intense research efforts. However, there has been significantly less deliberate emphasis on rationally designing a catalyst system with a prolonged stability. A major obstacle comes from the ambiguity behind how catalyst degrades. Several degradation mechanisms are proposed in literature, but with a lack of systematic studies, the causal relations between degradation and those proposed mechanisms remain ambiguous. Here, a systematic study of a catalyst system comprising of small particles and single atoms of Pt sandwiched between graphene layers, GR/Pt/GR, is studied to unravel the degradation mechanism of the studied electrocatalyst for oxygen reduction reaction(ORR). Catalyst suffers from atomic dissolution under ORR harsh acidic and oxidizing operation voltages. Single atoms trapped in point defects within the top graphene layer on their way hopping through toward the surface of GR/Pt/GR architecture. Trapping mechanism renders individual Pt atoms as single atom catalyst sites catalyzing ORR for thousands of cycles before washed away in the electrolyte. The GR/Pt/GR catalysts also compare favorably to state‐of‐the‐art commercial Pt/C catalysts and demonstrates a rational design of a hybrid nanoarchitecture with a prolonged stability for thousands of operation cycles.

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Magic of hydrogen spillover: Understanding and application

Cited by 128 publications

References 345 publications

Recent Development in Nanoconfined Hydrides for Energy Storage

Recent Development in Nanoconfined Hydrides for Energy Storage

Hydrogen Spillover Mechanism of Superaerophobic NiSe₂‐Ni₅P₄ Electrocatalyst to Promote Hydrogen Evolution in Saline Water

Catalysis Sans Catalyst Loss: The Origins of Prolonged Stability of Graphene–Metal–Graphene Sandwich Architecture for Oxygen Reduction Reactions

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Magic of hydrogen spillover: Understanding and application

Cited by 128 publications

References 345 publications

Recent Development in Nanoconfined Hydrides for Energy Storage

Recent Development in Nanoconfined Hydrides for Energy Storage

Hydrogen Spillover Mechanism of Superaerophobic NiSe2‐Ni5P4 Electrocatalyst to Promote Hydrogen Evolution in Saline Water

Catalysis Sans Catalyst Loss: The Origins of Prolonged Stability of Graphene–Metal–Graphene Sandwich Architecture for Oxygen Reduction Reactions

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Hydrogen Spillover Mechanism of Superaerophobic NiSe₂‐Ni₅P₄ Electrocatalyst to Promote Hydrogen Evolution in Saline Water