Hydrogen: The ultimate fuel and energy carrier

Dinga, Gustav P.

doi:10.1021/ed065p688

Cited by 25 publications

(20 citation statements)

References 14 publications

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“…9b that the A3/C2 peaks are the only peaks to display a significant enhancement upon potential cycling. Hence the latter peak combination is attributed to an Fe(II)/Fe(III) redox transition in a polymer microdispersed hydrous oxide layer, formed initially by hydration of the outer regions of the Fe(OH) 2 or FeO film. In recent years, the redox switching and interfacial behaviour of such hydrous oxide modified electrodes have been examined using Probe Beam Deflection (PBD) and Electrochemical Quartz Crystal Microbalance (EQCM).…”

Section: Interfacial Redox Chemistry Of Iron Based Electrodes In Alkamentioning

confidence: 98%

“…However, depending on the annealing temperature different phases of the oxide layer may also form. For example, at temperatures T > 400 1C NiCo 2 O 4 decomposes to NiO, resulting in enrichment of the NiCo 2 O 4 surface with NiO. 65,66 Similarly, Co 3 O 4 decomposes to CoO at temperatures exceeding 900 1C.…”

Section: The Materials: Transition Metal Oxide Electrodesmentioning

confidence: 99%

“…In general, the electrocatalytic activity of thermally prepared oxides, such as RuO 2 and Co 3 O 4 , tends to decrease with increasing annealing temperature. 69 Trasatti and coworkers 64 noted that the activity of pure RuO 2 films, as expressed by the redox charge Q* which can be used as a measure of the surface concentration of active sites (Section 3.1), decreased as the temperature increased over the temperature range 300-800 1C.…”

Section: The Materials: Transition Metal Oxide Electrodesmentioning

confidence: 99%

“…[159][160][161][162][163][164] Under such circumstances the deposition chemistry involves the direct or indirect reduction of the nitrate ion to either nitrous acid, hydroxylamine or the nitrite ion. 160,171,172 In all cases the hydroxyl ion is generated, resulting in the formation of either a-Ni(OH) 2 or b-Ni(OH) 2 according to eqn (2),…”

Section: Bulk Oxide/hydroxide Electrodesmentioning

confidence: 99%

“…Hence, both Ni(OH) 2 and NiOOH may well be formed during the course of the potential sweep perturbation. A similar dependence of the composition of the oxide/ hydroxide film on the experimental method has also been observed for Mn and Co based materials.…”

Section: Bulk Oxide/hydroxide Electrodesmentioning

confidence: 99%

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Redox and electrochemical water splitting catalytic properties of hydrated metal oxide modified electrodes

Doyle

Godwin

Brandon

et al. 2013

Phys. Chem. Chem. Phys.

538

565

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This paper presents a review of the redox and electrocatalytic properties of transition metal oxide electrodes, paying particular attention to the oxygen evolution reaction. Metal oxide materials may be prepared using a variety of methods, resulting in a diverse range of redox and electrocatalytic properties. Here we describe the most common synthetic routes and the important factors relevant to their preparation. The redox and electrocatalytic properties of the resulting oxide layers are ascribed to the presence of extended networks of hydrated surface bound oxymetal complexes termed surfaquo groups. This interpretation presents a possible unifying concept in water oxidation catalysis -bridging the fields of heterogeneous electrocatalysis and homogeneous molecular catalysis. In contextOver the past 50 years considerable research efforts have been devoted to the realisation of efficient, economical and renewable energy sources. Metal oxide materials have played a large part in this drive with demonstrated applications at both the research and commercial level. Their use in areas such as batteries, fuel cells and water electrolysis has resulted in the development of materials with a diverse range of structural and chemical properties. In all cases, understanding the fundamental electrochemistry of the material can be invaluable for rational design and optimisation. This review focuses on the redox, charge transport and electrocatalytic properties of transition metal oxide electrodes as they pertain to the electrolytic splitting of water. Particular emphasis is placed on the nature of the active surface which is interpreted in terms of hydrated interlinked oxymetal complexes termed surfaquo groups. In this way, the review seeks to bridge the gap between heterogeneous electrocatalysis and homogeneous molecular catalysis for water oxidation, areas of considerable modern interest and activity.

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Section: Interfacial Redox Chemistry Of Iron Based Electrodes In Alkamentioning

confidence: 98%