Self-assembly of cobalt hexacyanoferrate crystals in 1-D array using ion exchange transformation route for enhanced electrocatalytic oxidation of alkaline and neutral water

Bui, Hoa Thi; Ahn, Do Young; Shrestha, Nabeen K.; Sung, Myung Mo; Lee, Joong Kee; Han, Sang Woo

doi:10.1039/c6ta03436e

Cited by 61 publications

(30 citation statements)

References 30 publications

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“…And it needs overpotential of only 320 and 536 mV to drive 2 and 10 mA cm −2 at neutral pH, respectively, which is much smaller than that of α‐Co(OH) 2 NA/CC (

η_{2 mA {cm}^{- 2}}

=420 mV,

η_{10 mA {cm}^{- 2}}

=640 mV) in the OER process. This overpotential compares favorably to the behavior of other reported catalysts like 1‐D CoHCF/CFP (

η_{2 mA {cm}^{- 2}}

=∼490 mV), Mn 5 O 8 NPs (

η_{2 mA {cm}^{- 2}}

=500 mV), Co 3 S 4 nanosheets (

η_{2 mA {cm}^{- 2}}

=520 mV), and ZrS 3 nanosheets (

η_{2 mA {cm}^{- 2}}

=510 mV) under neutral condition, implying the high OER activity of CoP NA/CC. It is important to point out that the CC substrate has poor activities for HER and OER, confirming that CoP NA/CC is dominantly responsible for the HER and OER electrocatalysis.…”

Section: Figuresupporting

confidence: 74%

Self‐Standing CoP Nanosheets Array: A Three‐Dimensional Bifunctional Catalyst Electrode for Overall Water Splitting in both Neutral and Alkaline Media

et al. 2017

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It is highly attractive, but still remains a huge challenge, to develop efficient non‐noble‐metal electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under neutral and alkaline conditions. In this paper, we report that CoP nanosheet arrays on carbon cloth (CoP NA/CC), derived from α‐Co(OH)2 NA/CC, behaves as a three‐dimensional bifunctional water‐splitting catalyst electrode with high activity and durability in neutral and alkaline media. Such CoP NA/CC demands overpotentials of 145 and 52 mV to afford 10 mA cm−2 for the HER in 1.0 M phosphate buffer solution (PBS) and 1.0 M KOH, respectively, with much superior activity to α‐Co(OH)2 NA/CC. It can be attributed to the more thermo‐neutral hydrogen adsorption free energy for CoP than α‐Co(OH)2, according to density functional theory calculations. This electrode also demonstrates superior OER activity over α‐Co(OH)2 NA/CC and needs overpotentials of only 536 and 300 mV to drive 10 mA cm−2 at neutral and alkaline pH, respectively. The two‐electrode water electrolyzer using CoP NA/CC as both the cathode and anode shows a 2 mA cm−2 water‐splitting current at a cell voltage of 1.60 V in 1.0 M PBS and needs 1.65 V for 10 mA cm−2 under alkaline condition with excellent stability.

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“…And it needs overpotential of only 320 and 536 mV to drive 2 and 10 mA cm −2 at neutral pH, respectively, which is much smaller than that of α‐Co(OH) 2 NA/CC (

η_{2 mA {cm}^{- 2}}

=420 mV,

η_{10 mA {cm}^{- 2}}

=640 mV) in the OER process. This overpotential compares favorably to the behavior of other reported catalysts like 1‐D CoHCF/CFP (

η_{2 mA {cm}^{- 2}}

=∼490 mV), Mn 5 O 8 NPs (

η_{2 mA {cm}^{- 2}}

=500 mV), Co 3 S 4 nanosheets (

η_{2 mA {cm}^{- 2}}

=520 mV), and ZrS 3 nanosheets (

η_{2 mA {cm}^{- 2}}

Section: Figuresupporting

confidence: 74%

Self‐Standing CoP Nanosheets Array: A Three‐Dimensional Bifunctional Catalyst Electrode for Overall Water Splitting in both Neutral and Alkaline Media

et al. 2017

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“…PBA can be prepared from abundant and non-toxic elements by simple and low-cost coprecipitation synthesis that is easily scalable. In addition to battery materials, PBA are promising as electrocatalysts for water splitting [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Strategies for synthesis of Prussian blue analogues

et al. 2021

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We report a comparison of different common synthetic strategies for preparation of Prussian blue analogues (PBA). PBA are promising as cathode material for a number of different battery types, including K-ion and Na-ion batteries with both aqueous and non-aqueous electrolytes. PBA exhibit a significant degree of structural variation. The structure of the PBA determines the electrochemical performance, and it is, therefore, important to understand how synthesis parameters affect the structure of the obtained product. PBA are often synthesized by co-precipitation of a metal salt and a hexacyanoferrate complex, and parameters such as concentration and oxidation state of the precursors, flow rate, temperature and additional salts can all potentially affect the structure of the product. Here, we report 12 different syntheses and compare the structure of the obtained PBA materials.

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“…[10] However,t he relativelyl ow current density of OER electrodes in neutral electrolytei ss till far from meeting the requirementso ft he practical applications. [10] However,t he relativelyl ow current density of OER electrodes in neutral electrolytei ss till far from meeting the requirementso ft he practical applications.…”

mentioning

confidence: 99%

“…Most importantly,t he molecular ratio of Co and Oa toms was estimated to be 0.84 from the XPS analysisr esults and was significantly higher than the standard value ( Exploring the high efficiency of transition metal-based OER electrodes with obvious advantages for the cost and safety issues is rather promising for water splitting. [10] However,t he relativelyl ow current density of OER electrodes in neutral electrolytei ss till far from meeting the requirementso ft he practical applications. [11] The OER performance of as-obtained V O -rich Co 3 O 4 /Tie lectrodes and typical control samples was thus tested here ( Figure 2).…”

mentioning

confidence: 99%

Oxygen Vacancy Engineering of Co₃O₄ Nanocrystals through Coupling with Metal Support for Water Oxidation

et al. 2017

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Oxygen vacancies can help to capture oxygen-containing species and act as active centers for oxygen evolution reaction (OER). Unfortunately, effective methods for generating a high amount of oxygen vacancies on the surface of various nanocatalysts are rather limited. Here, we described an effective way to generate oxygen-vacancy-rich surface of transition metal oxides, exemplified with Co O , simply by constructing highly coupled interface of ultrafine Co O nanocrystals and metallic Ti. Impressively, the amounts of oxygen vacancy on the surface of Co O /Ti surpassed the reported values of the Co O modified even under highly critical conditions. The Co O /Ti electrode could provide a current density of 23 mA cm at an OER overpotential of 570 mV, low Tafel slope, and excellent durability in neutral medium. Because of the formation of a large amount of oxygen vacancies as the active centers for OER on the surface, the TOF value of the Co O @Ti electrode was optimized to be 3238 h at an OER overpotential of 570 mV, which is 380 times that of the state-of-the-art non-noble nanocatalysts in the literature.

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Self-assembly of cobalt hexacyanoferrate crystals in 1-D array using ion exchange transformation route for enhanced electrocatalytic oxidation of alkaline and neutral water

Abstract: 1-D array of Co3[Fe(CN)6]2 film obtained by ion exchange mediated chemical transformation route from Co(CO3)0.35Cl0.20(OH)1.10 demonstrated an enhanced electrocatalytic oxidation of alkaline and neutral water.

Cited by 61 publications

References 30 publications

Self‐Standing CoP Nanosheets Array: A Three‐Dimensional Bifunctional Catalyst Electrode for Overall Water Splitting in both Neutral and Alkaline Media

Self‐Standing CoP Nanosheets Array: A Three‐Dimensional Bifunctional Catalyst Electrode for Overall Water Splitting in both Neutral and Alkaline Media

Strategies for synthesis of Prussian blue analogues

Oxygen Vacancy Engineering of Co₃O₄ Nanocrystals through Coupling with Metal Support for Water Oxidation

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Self-assembly of cobalt hexacyanoferrate crystals in 1-D array using ion exchange transformation route for enhanced electrocatalytic oxidation of alkaline and neutral water

Abstract: 1-D array of Co3[Fe(CN)6]2 film obtained by ion exchange mediated chemical transformation route from Co(CO3)0.35Cl0.20(OH)1.10 demonstrated an enhanced electrocatalytic oxidation of alkaline and neutral water.

Cited by 61 publications

References 30 publications

Self‐Standing CoP Nanosheets Array: A Three‐Dimensional Bifunctional Catalyst Electrode for Overall Water Splitting in both Neutral and Alkaline Media

Self‐Standing CoP Nanosheets Array: A Three‐Dimensional Bifunctional Catalyst Electrode for Overall Water Splitting in both Neutral and Alkaline Media

Strategies for synthesis of Prussian blue analogues

Oxygen Vacancy Engineering of Co3O4 Nanocrystals through Coupling with Metal Support for Water Oxidation

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Oxygen Vacancy Engineering of Co₃O₄ Nanocrystals through Coupling with Metal Support for Water Oxidation