Suppressing buoyant force: New avenue for long-term durability of oxygen evolution catalysts

Kim, Sungsoon; Ahn, Changui; Cho, Yoonjun; Hyun, Gayea; Jeon, Seokwoo; Park, Jae Hyung

doi:10.1016/j.nanoen.2018.10.009

Cited by 35 publications

(47 citation statements)

References 40 publications

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“…These results are consistent with the non-periodical gas bubble detachment and the corresponding resistance/potential fluctuations reported in previous studies. [70,71,73] In comparison, much lower amplitude peaks are observed for FeNi(VO 4 ) x @NF over the entire frequency range (Figure 6b inset). Although these peaks again suggest a nonperiodical gas bubble evolution over the vanadate-modified surface with respect to the periodical behavior of single bubbles, [70][71][72] their lower amplitude point out the much smaller gas bubbles and faster rate in the nucleation, growth and detachment steps, which do not impact the OER reaction enough to generate a response detectable by the dynamic impedance resistance measurement.…”

Section: Mechanistic Studiesmentioning

confidence: 91%

Efficient Oxygen Evolution and Gas Bubble Release Achieved by a Low Gas Bubble Adhesive Iron–Nickel Vanadate Electrocatalyst

Dastafkan

Meyer

Chen

et al. 2020

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Surface chemistry is a pivotal prerequisite beside the catalyst composition toward advanced water electrolysis. Here, an evident enhancement of oxygen evolution reaction (OER) is demonstrated on a vanadate-modified iron-nickel catalyst synthesized by a successive ionic layer adsorption and reaction method, which demonstrates ultralow overpotentials of 274 and 310 mV for delivering large current densities of 100 and 400 mA cm -2 , respectively in 1ᴍ KOH, where vigorous gas bubble evolution occurs. Vanadate modification augments the OER activity by (i) increasing the electrochemical surface area and intrinsic activity of the active sites, (ii) having an electronic interplay with Fe and Ni catalytic centers, and (iii) inducing a high surface wettability and a low-gas bubble-adhesion for accelerated mass transport and gas bubble dissipation at large current densities. Ex situ and operando Raman study reveals the structural evolution of β-NiOOH and γ-FeOOH phases during the OER through vanadate-active site synergistic interactions. Operando dynamic specific resistance measurement evidences an accelerated gas bubble dissipation by a significant decrease in the variation of the interfacial resistance during the OER for the vanadate-modified surface.Achievement of a high catalytic turnover of 0.12 s -1 suggests metallic oxo-anion modification as a versatile catalyst design strategy for advanced water oxidation.

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Section: Mechanistic Studiesmentioning

confidence: 91%

Efficient Oxygen Evolution and Gas Bubble Release Achieved by a Low Gas Bubble Adhesive Iron–Nickel Vanadate Electrocatalyst

Dastafkan

Meyer

Chen

et al. 2020

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“…Also, the surface area of ANF can be easily controlled by changing anodization time while maintaining the morphology. These characteristics of ANF deconvolute the complex relations of active surface area and transport properties, thereby enabling us to observe the effects of transport properties on OER activity as a function of surface area under high current densities, while minimizing other complicating factors, such as severe oxygen bubble issues − and low utilization of catalytic active sites by high catalyst loadings (also known as overgrowth) . Second, previous studies of transport limitations have been carried out using the same composition of the catalyst with different loadings. ,, However, in our study, using the same ANF samples, two different compositions of catalysts, Fe-free and Fe-doped ANFs, were prepared in situ in Fe-free and unpurified 1 M KOH electrolytes, respectively, via OER precycling.…”

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confidence: 95%

Anodized Nickel Foam for Oxygen Evolution Reaction in Fe-Free and Unpurified Alkaline Electrolytes at High Current Densities

et al. 2021

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To achieve practically high electrocatalytic performance for the oxygen evolution reaction (OER), the active surface area should be maximized without severely compromising electron and mass transport throughout the catalyst electrode. Though the importance of electron and mass transport has been studied using low surface area catalysts under low current densities (∼tens of mA/cm2), the transport properties of large surface area catalysts under high operating current densities (∼500 mA/cm2) for practical OER catalysis have rarely been explored. Herein, three-dimensional (3D) hierarchically porous anodized nickel foams (ANFs) with large and variable surface areas were synthesized via electrochemical anodization of 3D nickel foam and applied as OER electrocatalysts in Fe-free and unpurified KOH electrolytes. Using Fe-free and in situ Fe-doped ANF that were prepared in Fe-free and unpurified electrolytes, respectively, we investigated the interdependent effects of active surface area and transport properties on OER activity under practically high current densities. While activity increased linearly with active surface area for Fe-free ANF, the activity of Fe-doped ANF showed a nonlinear increase with active surface area due to lower electrocatalytic activity enhancement. Detailed investigations on the possible factors (Fe incorporation, mass transport, and electron transport) identified that electron transport limitations played the major role in restricting the activity enhancement with increasing active surface area for Fe-doped ANF, although Fe-doped ANF has electron transport properties better than those of Fe-free ANF. This study exemplifies the growing significance of electron transport properties in large surface area catalysts, especially those with superb intrinsic catalytic activity and high operating current density.

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“…Indeed, the produced oxygen‐gas bubbles and the dissolution of the catalyst material in the liquid electrolyte are the two most important factors that affect the stability of the catalyst. Park and co‐workers combined a 3D ordered nanoporous nickel electrode with a NiFe(OH) 2 ‐based OER‐active material, [ 76 ] whereby the unique nanopore array structure of the as‐prepared catalyst resulted in an enlarged active surface area and the ability to rapidly remove oxygen bubbles through the effect of spatial confinement. Therefore, the NiFe‐decorated 3D‐ordered nanoporous Ni electrode delivered an overpotential of 261 mV at 10 mA cm −2 , with an ultrahigh turnover frequency of 2.9 s −1 and an ultralong durability of 300 h.…”

Section: Advanced Nife‐based Electrocatalystsmentioning

confidence: 99%

Recent Progress on NiFe‐Based Electrocatalysts for the Oxygen Evolution Reaction

Zhao

Zhang

et al. 2020

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are required. [2a,b,3] Among the various sustainable energy candidates, hydrogen fuel has garnered significant attention owing to its natural advantages. Hydrogen is typically a nontoxic and environmentally friendly power source that can be produced from water, which is an earth-abundant reactant, and produces no CO 2 emissions when converted into other energy forms. [4-6] In addition, due to its high mass-specific energy density, hydrogen can be efficiently used in mobile applications. Moreover, hydrogen can be used in combustion engines and fuel cells. Hence, the development of efficient hydrogen-based energy systems is necessary. [7-9] Producing hydrogen by electrolytic water splitting is considered a promising approach to resolve the current environmental crisis and has been extensively investigated with emphasis on availability and sustainability. [10,11] During water electrolysis, the cathodic hydrogen evolution reaction (HER) [12] and the anodic oxygen evolution reaction (OER) occur simultaneously, as exemplified by the following equations

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Suppressing buoyant force: New avenue for long-term durability of oxygen evolution catalysts

Cited by 35 publications

References 40 publications

Efficient Oxygen Evolution and Gas Bubble Release Achieved by a Low Gas Bubble Adhesive Iron–Nickel Vanadate Electrocatalyst

Efficient Oxygen Evolution and Gas Bubble Release Achieved by a Low Gas Bubble Adhesive Iron–Nickel Vanadate Electrocatalyst

Anodized Nickel Foam for Oxygen Evolution Reaction in Fe-Free and Unpurified Alkaline Electrolytes at High Current Densities

Recent Progress on NiFe‐Based Electrocatalysts for the Oxygen Evolution Reaction

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