Modified electrolytic manganese dioxide (MEMD) for oxygen generation in alkaline medium

Delgado, Dario; Minakshi, Manickam; Senanayake, Gamini; Kim, Dong-Jin

doi:10.1007/s10008-014-2727-1

Cited by 23 publications

(26 citation statements)

References 28 publications

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“…5) with greater surface coverage and for RuO 2 it was the 1st electron transfer step (Eq. 4) . Due to abnormally low Tafel slope value in the case of FS 80, the rds could not be predicted precisely.…”

Section: Resultsmentioning

confidence: 97%

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

et al. 2019

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The polyol method is an efficient procedure for metal sulfide preparation where polyol not only acts as a solvent but also as reducing and morphology‐modulating agent. Herein, iron sulfide particles were prepared via a modified polyol method by changing the ethylene glycol (EG) : water (H2O) ratio in the mixed solvent. Analytical techniques and electronic microscopy studies confirmed that the change in EG : H2O ratio modulated the crystal structure, morphology, and electronic structure of the prepared iron sulfide particles. The electrocatalytic activity of iron sulfide changed owing to these modulations. EG helped in the formation of a sheet‐like structure – a morphology that favours a higher accessibility to the catalytically active sites. As evidenced form electrochemical impedance studies, an increased electron density near the Fermi level, a faster substrate adsorption‐desorption rate at the active sites, and a faster charge transfer at the electrode‐electrolyte interface were the key factors for the amplification in catalytic activity. The prepared iron sulfide particles showed an overall water splitting efficiency that is comparable to that of the state‐of‐the‐art RuO2‐Pt/C couple in alkaline medium. This study shows the potential of the polyol method in the preparation and catalytic‐activity modulation of Fe−S‐based electrocatalysts.

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Section: Resultsmentioning

confidence: 97%

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

et al. 2019

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“…The geometric and electronic factors of the starting "electrolytic manganese dioxide (EMD) material" are modied by Dario et al 213 to enhance its electrochemical activity, in particular to overpotential and Tafel slope, towards the oxygen evolution reaction. As a fuel, hydrogen generates electricity and environmental friendly H 2 O as by-product.…”

Section: Emd As Efficient Catalyst For Oermentioning

confidence: 99%

Electrolytic manganese dioxide (EMD): a perspective on worldwide production, reserves and its role in electrochemistry

et al. 2015

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“…To fit the EIS data, two types of circuits are commonly used which are, two time constant parallel (2TP) as proposed by Armstrong and Henderson and two time constant series (2TS) as proposed by Lasia and Chen (as depicted in Figure d) where, uncompensated and charge transfer resistance was abbreviated as R u and R CT , respectively. In the case of 2TP, the CPE 2 ‐R p couple signifies hydrogen adsorption‐desorption kinetics and in the case of 2TS, CPE 1 ‐R 1 signifies the porosity of the electrode material . Phase angle vs frequency plot for C 1 M 1 S (as depicted in Figure S3) revealed the presence of potential dependent as well as independent time constant and thus, the equivalent circuit model matched well with the 2TS model.…”

Section: Introductionmentioning

confidence: 68%

“…The R u and R CT denote uncompensated and charge transfer resistance, respectively. CPE 1 ‐R 1 and CPE 3 ‐R P arose due to terminal peroxide group formation and active species adsorption‐desorption, respectively . The equivalent circuit fitted data are shown in Table S6.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Cobalt Sulfide/Molybdenum Sulfide Heterostructure as Bifunctional Electrocatalyst towards Overall Water Splitting

et al. 2018

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The development of non‐noble metal based electrocatalysts for overall water splitting is a potent strategy towards a carbon‐neutral and clean energy economy. Herein, hierarchical CoSx@MoS2 was synthesized via a one‐pot solvothermal process. Formation of the heterostructure was confirmed by electron microscopy and spectroscopic techniques. CoSx@MoS2 showed competent electrocatalytic activity towards both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline medium. Superior electrocatalytic activity was attributed to the increase in number of active sites, betterment in charge transfer and facilitation of H‐ and O‐ containing active species adsorption‐desorption at the active sites. Overall water splitting efficiency of CoSx@MoS2 was found to be superior in comparison to the state‐of‐the‐art RuO2‐Pt/C couple. Along with efficiency the heterostructure also exhibited long‐term operational durability. Thus, hierarchical CoSx@MoS2 is a potential non‐noble metal based bifunctional electrocatalyst towards overall water splitting.

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Modified electrolytic manganese dioxide (MEMD) for oxygen generation in alkaline medium

Cited by 23 publications

References 28 publications

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

Effect of the Solvent Ratio (Ethylene Glycol/Water) on the Preparation of an Iron Sulfide Electrocatalyst and Its Activity towards Overall Water Splitting

Electrolytic manganese dioxide (EMD): a perspective on worldwide production, reserves and its role in electrochemistry

Hierarchical Cobalt Sulfide/Molybdenum Sulfide Heterostructure as Bifunctional Electrocatalyst towards Overall Water Splitting

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