Cobalt-iron (oxides) water oxidation catalysts: Tracking catalyst redox states and reaction dynamic mechanism

Meng, Jianfang; Cui, Zhenduo; Yang, Xianjin; Zhu, Shengli; Li, Zhaoyang; Qi, Kezhen; Zheng, Lirong; Liang, Yanqin

doi:10.1016/j.jcat.2018.06.031

Cited by 35 publications

(13 citation statements)

References 46 publications

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“…Accordingly, four PBA samples with distinct Co–Fe molar ratios were successfully prepared as precursors to synthesize various metal compositions of PBA-derived metal oxides. It has been reported that adjusting the percentage of Fe in the metal part of Co-based oxide would bring better enhancement for OER electrocatalysis. , Therefore, benefiting from the tunable metal composition in the PBA precursors, various Fe contents in PBA-derived metal oxides playing an important role in OER activity could be investigated.…”

Section: Resultsmentioning

confidence: 99%

“…It has been reported that adjusting the percentage of Fe in the metal part of Co-based oxide would bring better enhancement for OER electrocatalysis. 56,57 Therefore, benefit- ing from the tunable metal composition in the PBA precursors, various Fe contents in PBA-derived metal oxides playing an important role in OER activity could be investigated. Furthermore, TEM was conducted to show the internal morphology of the nanomaterials.…”

Section: Resultsmentioning

confidence: 99%

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Prussian Blue Analogue-Derived Metal Oxides as Electrocatalysts for Oxygen Evolution Reaction: Tailoring the Molar Ratio of Cobalt to Iron

Chuang

Hsiao

Yeh

et al. 2020

ACS Appl. Energy Mater.

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The incorporation of iron into pristine transition metal oxides has been considered as an effective strategy to enhance the electrocatalytic activity toward oxygen evolution reaction (OER). However, the introduction of other transition metals in diverse catalytic systems using a precisely controllable method has remained a great challenge. In this study, a facile strategy is proposed by using Prussian blue analogues (PBAs) with tunable metal composition as a template to synthesize various Co−Fe molar ratios of spinel metal oxides. The iron−cobalt oxide (FeCo oxide) is successfully synthesized by utilizing thermal conversion of FeCo-based PBAs; the obtained oxide possessed a rough and porous structure with numerous interconnected granular nanoparticles formed in hollow multiple voids of each surface. In addition, the suitable iron contents occupying the octahedral sites in the spinel structure of FeCo oxide can further reduce the charge-transfer resistance and enhance the electrocatalytic activities toward OER. Benefiting from the unique structure and the chemical composition, the as-synthesized FeCo oxide shows an excellent OER activity with a low overpotential of 310 mV at 10 mA cm −2 and a good stability for at least 12 h of operation in alkaline solution. These results suggest that the electrocatalytic activities can be optimized by controllable metal composition of the PBA-derived metal oxides, which are the promising electrocatalysts for OER application.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Prussian Blue Analogue-Derived Metal Oxides as Electrocatalysts for Oxygen Evolution Reaction: Tailoring the Molar Ratio of Cobalt to Iron

Chuang

Hsiao

Yeh

et al. 2020

ACS Appl. Energy Mater.

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“…The d-band center of a transitional metal represents the strength of the interaction between the metal and adsorbate intermediates. Binding too weakly or too strongly with the intermediates negatively affects the oxygen catalytic activity . On the other hand, the ORR activity of Co 3 O 4 was limited by its relatively low chemical adsorption of oxygen (O 2 ).…”

Section: Results and Discussionmentioning

confidence: 99%

“…Binding too weakly or too strongly with the intermediates negatively affects the oxygen catalytic activity. 40 On the other hand, the ORR activity of Co 3 O 4 was limited by its relatively low chemical adsorption of oxygen (O 2 ). It is difficult for the adsorbed O 2 species to trap the first electron and carry out the following reaction.…”

Section: Resultsmentioning

confidence: 99%

Systematic Study of the Electronic, Carbon, and N-Doping Effects of CoMn-Oxide Composites as Bifunctional Oxygen Electrocatalysts

Chen

Zhang

et al. 2019

J. Phys. Chem. C

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Many cobalt-manganese oxides have been widely studied and reported to be excellent bifunctional oxygen catalysts for regenerative fuel cells and metal–air batteries. The studied materials include various shapes, compositions, and structures that have shown excellent bifunctional catalytic activity and stability. However, the structure–activity relationship of these catalyst materials has not been studied in-depth. The bifunctional activity of such catalysts is affected by many factors, and their specific morphology and composition determine their catalytic activity. The existing studies are fascinating but may lack implications for the design of better and more practical materials for bifunctional catalysts. Therefore, we have prepared binary cobalt-manganese oxides and corresponding nitrogen-doped carbon-based composite catalyst materials. By means of physical characterization, including X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy, combined with electrochemical characterization methods, various factors that affect the bifunctional catalytic activity of catalyst materials were systematically studied. The correlations between the electronic structure effect, carbon support effect, nitrogen-doping effect, and bifunctional catalytic activity are summarized.

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“…In 1972, Fujishima et al first described the TiO 2 photoelectrode water splitting phenomenon [216], and as a result, photocatalytic H 2 production has gained much attention [217][218][219][220]. Hydrogen is one of the crucial pure fuels [221][222][223]. Hydrogen production using the appropriate photocatalyst and solar power is an important factor not just because it is an excellent way to supply large-scale renewable and clean hydrogen but also to prevent probable energy-storage problems.…”

Section: Water Splittingmentioning

confidence: 99%

Bismuth-Graphene Nanohybrids: Synthesis, Reaction Mechanisms, and Photocatalytic Applications—A Review

et al. 2021

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Photocatalysis is a classical solution to energy conversion and environmental pollution control problems. In photocatalysis, the development and exploration of new visible light catalysts and their synthesis and modification strategies are crucial. It is also essential to understand the mechanism of these reactions in the various reaction media. Recently, bismuth and graphene’s unique geometrical and electronic properties have attracted considerable attention in photocatalysis. This review summarizes bismuth-graphene nanohybrids’ synthetic processes with various design considerations, fundamental mechanisms of action, heterogeneous photocatalysis, benefits, and challenges. Some key applications in energy conversion and environmental pollution control are discussed, such as CO2 reduction, water splitting, pollutant degradation, disinfection, and organic transformations. The detailed perspective of bismuth-graphene nanohybrids’ applications in various research fields presented herein should be of equal interest to academic and industrial scientists.

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Cobalt-iron (oxides) water oxidation catalysts: Tracking catalyst redox states and reaction dynamic mechanism

Cited by 35 publications

References 46 publications

Prussian Blue Analogue-Derived Metal Oxides as Electrocatalysts for Oxygen Evolution Reaction: Tailoring the Molar Ratio of Cobalt to Iron

Prussian Blue Analogue-Derived Metal Oxides as Electrocatalysts for Oxygen Evolution Reaction: Tailoring the Molar Ratio of Cobalt to Iron

Systematic Study of the Electronic, Carbon, and N-Doping Effects of CoMn-Oxide Composites as Bifunctional Oxygen Electrocatalysts

Bismuth-Graphene Nanohybrids: Synthesis, Reaction Mechanisms, and Photocatalytic Applications—A Review

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