Spherical nickel doped cobalt phosphide as an anode catalyst for oxygen evolution reaction in alkaline media: From catalysis to system

Park, Deok‐Hye; Kim, Min-Ha; Kim, Myungjae; Byeon, Jeong-Hyeon; Jang, Jae‐Sung; Kim, Ji‐Hwan; Lim, Da-Mi; Park, Seon-Ha; Gu, Yun-Hui; Kim, Jiwoong; Park, Kyung-Won

doi:10.1016/j.apcatb.2023.122444

Cited by 36 publications

(6 citation statements)

References 60 publications

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“…The relatively less-formed precipitates on the cathode during lithium-ion exchange membrane WE using c-PES may be attributed to the compact contact between the cathode and c-PES. The addition of a polymer as the cathode catalyst binder to c-PES can enhance its chemical affinity . The improved chemical affinity of c-PES could result in decreased contact resistance obtained from high-frequency EIS data, indicating improved stability.…”

Section: Resultsmentioning

confidence: 99%

“…The addition of a polymer as the cathode catalyst binder to c-PES can enhance its chemical affinity. 33 The improved chemical affinity of c-PES could result in decreased contact resistance obtained from high-frequency EIS data, indicating improved stability. For single-cell measurements, the MEA was fabricated using IrO 2 as the anode catalyst coated on the Ni foam PTE and c-PES.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Lithium-Ion Exchange Membrane Water Electrolysis Using a Cationic Polymer-Modified Polyethersulfone Membrane

Lee¹,

Park

et al. 2023

ACS Sustainable Chem. Eng.

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We previously reported lithium-ion exchange membrane water electrolysis using a commercial Nafion membrane for clean hydrogen production. In this study, a polyethersulfone (PES) membrane with high alkaline stability was dipped in a cationic aqueous solution to fabricate a PES-based membrane (c-PES membrane) as an alternative to Nafion. Compared with the commercial PES membrane, for the c-PES membrane, lithium ions can selectively transport from the anode to the cathode. Additionally, a high-porosity Ni-based porous transport layer (PTL) was used as an alternative to expensive Ti-PTL. Lithium-ion exchange membrane water electrolysis at 50 °C using c-PES membrane exhibited improved cell performance (1.13 A cm–2 @ 1.7 V) owing to lower ohmic and charge-transfer resistance, exhibiting the comparable performance to the reported water electrolysis systems. The carbonate formed during the process was effectively removed by injecting deionized water followed by H2SO4 solution, resulting in stable cell performance for 200 h.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Lithium-Ion Exchange Membrane Water Electrolysis Using a Cationic Polymer-Modified Polyethersulfone Membrane

Lee¹,

Park

et al. 2023

ACS Sustainable Chem. Eng.

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“…In comparison to acidic electrolysis, liquid alkaline electrolysis is a more well-developed technology. Alkaline electrolysis is less costly as it employs non-noble-metal electrocatalysts such as Ni, Co, Fe, Mn, and Mo. − Additionally, compared to that in the alkaline medium, significant corrosion can be observed in an acidic medium.…”

Section: Introductionmentioning

confidence: 99%

Indispensable Nafion Ionomer for High-Efficiency and Stable Oxygen Evolution Reaction in Alkaline Media

Kakati,

Anderson,

et al. 2023

ACS Appl. Mater. Interfaces

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Addressing the challenge of sluggish kinetics and limited stability in alkaline oxygen evolution reactions, recent exploration of novel electrochemical catalysts offers improved prospects. To expedite the assessment of these catalysts, a half-cell rotating disk electrode is often favored for its simplicity. However, the actual catalyst performance strongly depends on the fabricated catalyst layers, which encounter mass transport overpotentials. We systematically investigate the role and sequence of electrode drop-casting methods onto a glassy carbon electrode regarding the efficiency of the oxygen evolution reaction. The catalyst layer without Nafion experiences nearly 50% activity loss post stability test, while those with Nafion exhibit less than 5% activity loss. Additionally, the sequence of application of the catalyst and Nafion also shows a significant effect on catalyst stability. The catalyst activity increases by roughly 20% after the stability test when the catalyst layer is coated first with an ionomer layer, followed by drop-casting the catalysts. Based on the half-cell results, the Nafion ionomer not only acts as a binder in the catalyst layer but also enhances the interfacial interaction between the catalyst and electrolyte, promoting performance and stability. This study provides new insights into the efficient and accurate evaluation of electrocatalyst performance and stability as well as the role of Nafion ionomer in the catalyst layer.

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“…Conversely, in alkaline conditions, nonnoble nickel metal has gained considerable prominence as a cost-effective and high effective electrocatalyst for the oxidation of organic molecules. [10,15,16] However, one challenge associated with the use of Ni-based electrodes for EOG lies in their remarkable activity towards the competing oxygen evolution reaction, [17][18][19] which can potentially reduce the faradaic efficiency towards glycerol products.…”

Section: Introductionmentioning

confidence: 99%

Effect of Iron Impurities on the Electrochemical Oxidation of Glycerol on Ni(OH)₂/NiOOH Electrodes

Santana,

Gjonaj,

Garcia

2023

ChemElectroChem

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Herein, the effect of iron (Fe) ions impurities in alkaline electrolyte is investigated for enhancing the activity of nickel‐oxyhydroxide (NiOOH) for electrochemical oxidation of glycerol (EOG). Cyclic voltammetry and chronoamperometry analyses show that Fe impurities have a significant effect on both EOG activity and product distribution. We found the presence of Fe impurities in the electrolyte enhance the C−C cleavage bonds within glycerol and its intermediates, thereby favoring the formation of C2 and C1 products. Our results deviate from the conventional observations in Ni‐based catalysis for EOG, which instead of the anticipated glycolate and formate products resulting from the C−C scission of glycerate, we observe the generation of oxalate (C2) and formate (C1), therefore suggesting the involvement of aldehyde intermediates in the reaction mechanism, providing a novel perspective on the higher faradaic efficiency of formic acid compared to glycolic acid. These results show the importance of eliminating iron ions from the electrolyte solution, as this step is pivotal in comprehending the cation effect on the electrochemical oxidation of glycerol in alkaline environments.

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Spherical nickel doped cobalt phosphide as an anode catalyst for oxygen evolution reaction in alkaline media: From catalysis to system

Cited by 36 publications

References 60 publications

Lithium-Ion Exchange Membrane Water Electrolysis Using a Cationic Polymer-Modified Polyethersulfone Membrane

Lithium-Ion Exchange Membrane Water Electrolysis Using a Cationic Polymer-Modified Polyethersulfone Membrane

Indispensable Nafion Ionomer for High-Efficiency and Stable Oxygen Evolution Reaction in Alkaline Media

Effect of Iron Impurities on the Electrochemical Oxidation of Glycerol on Ni(OH)₂/NiOOH Electrodes

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Spherical nickel doped cobalt phosphide as an anode catalyst for oxygen evolution reaction in alkaline media: From catalysis to system

Cited by 36 publications

References 60 publications

Lithium-Ion Exchange Membrane Water Electrolysis Using a Cationic Polymer-Modified Polyethersulfone Membrane

Lithium-Ion Exchange Membrane Water Electrolysis Using a Cationic Polymer-Modified Polyethersulfone Membrane

Indispensable Nafion Ionomer for High-Efficiency and Stable Oxygen Evolution Reaction in Alkaline Media

Effect of Iron Impurities on the Electrochemical Oxidation of Glycerol on Ni(OH)2/NiOOH Electrodes

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Effect of Iron Impurities on the Electrochemical Oxidation of Glycerol on Ni(OH)₂/NiOOH Electrodes