The anodic evolution of oxygen on Co3O4 film electrodes in alkaline solutions

Iwakura, Chiaki; Honji, A.; Tamura, Hideo

doi:10.1016/0013-4686(81)85116-x

Cited by 127 publications

(66 citation statements)

References 9 publications

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“…[13][14][15][16][17][18] Consequently, a significant body of research exists on the application of non-noble transition metal oxides as OER anodes. Among the most promising materials are various intermetallic alloys, [19][20][21] electrodeposited nickel, [22][23][24][25] cobalt [26][27][28] and manganese oxides, 29 spinels including nickelites, [30][31][32][33] cobaltites [34][35][36] and ferrites, 37,38 perovskites, [39][40][41][42] and hematite photoanodes. 43 An important practical and fundamental factor which should also be noted when considering OER anode materials is that, even in the case of the parent metal, the anodic OER always occurs at an oxidised surface.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…Taking early studies of electro-or photon-driven Co and Mn oxide catalysts as point of departure [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], development of nanostructured forms of these oxides featuring very high surface areas have dramatically increased turnover frequencies of O 2 product formation per projected catalyst area [17][18][19]. The need for high turnover frequency per projected area in artificial photosynthesis is based on the requirement that the catalyst should keep up with the incident solar flux in order to minimize wasting of photons.…”

Section: Introductionmentioning

confidence: 99%

Towards a Molecular Level Understanding of the Multi-Electron Catalysis of Water Oxidation on Metal Oxide Surfaces

Zhang

Frei

2014

Catal Lett

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Earth abundant metal oxides play a central role as catalysts in the essential chemical transformations of sunlight to fuel conversion, which are the oxidation of water and the reduction of carbon dioxide. The rapidly growing interest in renewable fuel generation by using the energy of the sun has recently led to substantial breakthroughs in the use of first row transition metal oxides as catalysts for oxygen evolution from water. Substantive improvements of rates and lowering of overpotentials have been achieved by exploiting materials properties on the nanoscale, or taking advantage of the synergy of multiple metals. Moreover, knowledge derived from mechanistic investigations with structure specific spectroscopy is accelerating efficiency improvements. Monitoring by timeresolved FT-infrared spectroscopy reveals the molecular nature of active sites, while in situ X-ray and optical spectroscopy under reaction conditions provides insights into the electronic structure of the surface metal centers participating in the catalysis. By combining the bond specificity of vibrational spectroscopy with the metal electronic structure specificity of optical, X-ray absorption or photoelectron spectroscopy, a complete understanding of active surface sites on metal oxides begins to emerge. Charge flow driving the chemical transformations probed by optical spectroscopy across time scales from ultrafast to very slow reveals the processes that control the productive use of charges delivered to the catalyst. Coupling of the water oxidation catalysis at a metal oxide catalyst with carbon dioxide reduction at a heterobinuclear chromophore, which is the goal of the artificial photosystem approach, is demonstrated by a well-defined all-inorganic polynuclear unit.

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“…Therefore, it is important to develop other oxide catalysts using more abundant transition metals. Cobalt (Co) oxide catalysts have been attracting much attention as a promising candidate for photo- [8,9] and electrocatalysis [10][11][12][13][14][15][16][17][18][19][20][21] species by applying a potential of over 0.8 V. Next, the Co 3+ species were hydrolyzed irreversibly accompanied by a polymerization reaction, releasing the citrate ions at the same time. This resulted in the deposition of an insoluble Co oxide on the ITO electrode.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic activity of electrodeposited cobalt oxide films to produce oxygen gas from water

Nishizawa

Nakamura

Ikeda

et al. 2015

Journal of Electroanalytical Chemistry

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An electrocatalytic cobalt oxide film for water oxidation was prepared on an indium tin oxide (ITO)-coated substrate by anodic electrodeposition. Atomic force microscopy measurements revealed that numerous particles with a diameter of 100-250 nm were uniformly dispersed on the ITO substrate and the particle size increased when prepared at higher temperature. Cyclic voltammograms of the Co oxide-coated ITO electrodes were measured in alkaline and neutral aqueous solutions to examine their redox characteristics and ability to catalyze water oxidation.When Co oxide was electrodeposited from solutions kept at 10, 25 and 50 °C, the amount of electroactive Co oxide per unit area (Γ ea ) was 1.06×10 -8 , 1.72×10 -8 , and 2.31×10 -8 mol cm -2 , respectively. The increase in Γ ea accompanied the increase in particle size observed with rising deposition temperature. Quantitative analyses of O 2 gas produced by water electrolysis were carried out under potentiostatic conditions using these Co oxide-modified electrodes and a bare ITO electrode for comparison. For the Co oxide-coated electrode prepared at 10 °C, the amount of O 2 evolved by electrolysis for 2 h at 1.3 V vs. Ag/AgCl was 1.3×10 -5 mol cm -2 in alkaline electrolyte solution and 1.52×10 -5 mol cm -2 in neutral electrolyte solution containing phosphate ions. In addition, when the Co oxide-coated electrode treated at 450 °C was used, the amount of O 2 evolved by the electrolysis increased to 2.58×10 -5 mol cm -2 in the neutral electrolyte solution containing phosphate ions, resulting from a stable catalytic current.

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The anodic evolution of oxygen on Co3O4 film electrodes in alkaline solutions

Cited by 127 publications

References 9 publications

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

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

Towards a Molecular Level Understanding of the Multi-Electron Catalysis of Water Oxidation on Metal Oxide Surfaces

Electrocatalytic activity of electrodeposited cobalt oxide films to produce oxygen gas from water

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