Facile Synthesis of an Efficient Ni–Fe–Co Based Oxygen Evolution Reaction Electrocatalyst

Lindstrom, Mary Lou; Gakhar, Ruchi; Raja, Krishnan S.; Chidambaram, Dev

doi:10.1149/1945-7111/ab6b08

Cited by 28 publications

(12 citation statements)

References 114 publications

(204 reference statements)

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“…The rFNCO electrode also exhibits a very low overpotential of 246 mV even at a very high current density of 100 mA cm –2 . It is worth noting that the catalytic OER activity achieved by the rFNCO electrode is comparable or even superior to that of the recently reported state-of-the-art non-precious-metal oxide-based electrocatalysts (Figure c). − Furthermore, the intrinsic activity of the samples was assessed by normalizing the geometrical current density using the corresponding ECSA, as shown in ECSA-based LSV curves (Figure S7). The normalized LSV curves revealed that the intrinsic OER catalytic activity of the samples followed the same order of rFNCO > FNCO > NCO, as observed in the geometrical area-based voltammograms.…”

Section: Results and Discussionmentioning

confidence: 60%

Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo₂O₄ for Enhanced Oxygen Evolution

Cho

Seo

et al. 2021

ACS Appl. Mater. Interfaces

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The oxygen evolution reaction (OER) plays a key role in determining the performance of overall water splitting, while a core technological consideration is the development of cost-effective, efficient, and durable catalysts. Here, we demonstrate a robust reduced Fe-oxide@ NiCo 2 O 4 bilayered non-precious-metal oxide composite as a highly efficient OER catalyst in an alkaline medium. A bilayered oxide composite film with an interconnected nanoflake morphology (Fe 2 O 3 @NiCo 2 O 4 ) is reduced in an aqueous NaBH 4 solution, which results in a mosslike Fe 3 O 4 @NiCo 2 O 4 (reduced Fe-oxide@NiCo 2 O 4 ; rFNCO) nanostructured film with an enhanced electrochemical surface area. The rFNCO film demonstrates an outstanding OER activity with an extraordinary low overpotential of 189 mV at 10 mA cm −2 (246 mV at 100 mA cm −2 ) and a remarkably small Tafel slope of 32 mV dec −1 . The film also shows excellent durability for more than 50 h of continuous operation, even at 100 mA cm −2 . Furthermore, density functional theory calculations suggest that the unintentionally in situ doped Ni during the reduction reaction possibly improves the OER performance of the rFNCO catalyst shifting d-band centers of both Fe and Ni active sites. KEYWORDS: bilayered Fe 3 O 4 /NiCo 2 O 4 , chemical reduction, metal interdiffusion, electrocatalytic water splitting, oxygen evolution reaction (OER)

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Section: Results and Discussionmentioning

confidence: 60%

Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo₂O₄ for Enhanced Oxygen Evolution

Cho

Seo

et al. 2021

ACS Appl. Mater. Interfaces

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“…The overall efficiency of the methanol oxidation can be determined by 50,53‐57 :

η = \frac{i_{t} - i_{oer}}{i_{t}} \times 100 %,

where i t is the overall current density during electrolysis of methanol. The overall efficiency of the electrocatalytic conversion of methanol is observed to be ~60% in the present work.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the roughness factors (RFs) for different carbon containing copper‐cobalt oxide structures have been evaluated using 56,57 :

RF = \frac{Electrochemically active surface areas ((), ECSA)}{Geometric surface area of the electrode} .

…”

Section: Resultsmentioning

confidence: 99%

Honeycomb like copper‐cobalt nanostructures and their synergy with carbon supports for electrooxidation of carbinol

Sesu

Swami

Kakade

2020

Intl J of Energy Research

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Summary Fabricating the significant electrocatalysts with enriched activity and stability is necessary due to the increasing demands of the fuel cell industries for its commercialization. This report provides a widespread impact on fabrication of a suitable and significant porous bimetallic nanocatalyst for methanol oxidation reaction (MOR). Here, we have developed nanofoams of Cu‐Co alloys/oxides with varied carbon supports using simple combustion method, where graphite oxide (GO) shows synergistic “catalyst‐support” effect than other substrates. The morphological studies reveal a honeycomb‐like structure with dense porous nature of Cu‐Co nanofoam (CuCo@rGO). X‐ray diffraction and spectroscopic studies reveal the formation of spinel structure of CuCo2O4 with active {110} facets in case of CuCo@rGO, exhibiting higher methanol electrooxidation activity of 198 mA/cm2, which is found to be improved than that of the previous reports. The optimized composition, CuCo@rGO shows the slow decrease in the current in chronoamperometric studies with 40% retention of its activity even after 10 hours. The CoCu@rGO nanofoam shows improved Brunauer‐Emmett‐Teller surface area of ~50 m2/g due to the addition of GO. In addition, the composite shows an excellent electrochemical surface area value of 7.75 m2/g over other compositions of different carbon supports. The intrinsic effect of better conductivity of Co75Cu25@rGO has also been confirmed using impedance spectroscopy. The porous honeycomb structure of Co75Cu25@rGO composite synergistically impacts methanol oxidation and also forbids the formation of CO intermediate, maintaining the activity.

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“…Many other transition metals have been substituted into NiOOH, forming bimetallic LDH OER catalysts, such as Co, , V, Mn, Cr, Zn . The introduction of an additional − or even two additional transition metals into NiFe-LDH resulted in improved OER activity. The design of the catalysts can be eased by a Sabatier-type analysis, where the difference between the adsorption energies of *O and *OH serves as a descriptor for OER activity trends.…”

Section: Electrochemical Behavior Of Layered Double Hydroxidesmentioning

confidence: 99%

Advances and Challenges in Industrial-Scale Water Oxidation on Layered Double Hydroxides

Mavrič

Cui

2021

ACS Appl. Energy Mater.

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A substantial effort is devoted to the development of efficient electrolyzers made of earth-abundant elements for low-temperature industrial-scale water electrolysis. However, a large current density leads to the decline of the reaction kinetics that result from the decrease of local pH, the irreversible redox states of active metal sites, and the structure and composition collapse. Currently, the transition metal layered double hydroxides (LDHs) are proven as efficient alkaline oxygen evolution catalysts and demonstrate promising current density, generally at the scale of 10 mA cm–2 for the potential solar-driven catalysis concerning 10% solar-to-fuels efficiency. However, there is very limited progress in understanding the activity and stability degradation mechanism of LDHs at high current density, for instance above 100 mA cm–2. Here we introduce the current advances in achieving activity enhancement by tuning the composition, structure, and morphology of LDHs and present the degradation mechanism during the electrolysis under oxidative alkaline environments, long-term operation, and voltage fluctuations. Finally, we present the state-of-the-art approaches to stabilize the overall performance of LDHs for water oxidation and provide an outlook in this field.

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Facile Synthesis of an Efficient Ni–Fe–Co Based Oxygen Evolution Reaction Electrocatalyst

Cited by 28 publications

References 114 publications

Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo₂O₄ for Enhanced Oxygen Evolution

Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo₂O₄ for Enhanced Oxygen Evolution

Honeycomb like copper‐cobalt nanostructures and their synergy with carbon supports for electrooxidation of carbinol

Advances and Challenges in Industrial-Scale Water Oxidation on Layered Double Hydroxides

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Facile Synthesis of an Efficient Ni–Fe–Co Based Oxygen Evolution Reaction Electrocatalyst

Cited by 28 publications

References 114 publications

Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo2O4 for Enhanced Oxygen Evolution

Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo2O4 for Enhanced Oxygen Evolution

Honeycomb like copper‐cobalt nanostructures and their synergy with carbon supports for electrooxidation of carbinol

Advances and Challenges in Industrial-Scale Water Oxidation on Layered Double Hydroxides

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Product

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Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo₂O₄ for Enhanced Oxygen Evolution

Experimental and Theoretical Insights into the Borohydride-Based Reduction-Induced Metal Interdiffusion in Fe-Oxide@NiCo₂O₄ for Enhanced Oxygen Evolution