Cobalt-Based Electrocatalysts for Water Splitting: An Overview

Loni, E.; Shokuhfar, Ali; Siadati, M. H.

doi:10.1007/s10563-021-09329-5

Cited by 19 publications

(14 citation statements)

References 208 publications

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“…Catalysts based on earth-abundant Co have received tremendous research interest owing to their intrinsic electrocatalytic capacity toward HER and/or OER. − Previous studies have validated that spinels of cobalt can contribute to higher electronic conductivity as well as the number of active sites, which in turn reflect in greater electrochemical features . Previously, it has been proven that the electronic structure of a catalyst can be modulated and thereby promoted by the incorporation of more cations.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, Co IV OO 2 combines with another OH – to form O 2 gas, a Co III OOH, and an electron (Step 4). As a whole, mixed cobalt states on the catalyst surface create more active sites and hence encourage the charge transfer. ,, …”

Section: Resultsmentioning

confidence: 99%

“…As a whole, mixed cobalt states on the catalyst surface create more active sites and hence encourage the charge transfer. 53,65,66 From Figure 6b, calculated Tafel slopes can be seen. The Tafel slope is a key indicator to ascertain the HER kinetics, establishing the rate-controlling step during the reaction.…”

Section: Introductionmentioning

confidence: 96%

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Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary Co_xNi_1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

et al. 2021

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Enormous efforts have been dedicated to engineering low-cost and efficient electrocatalysts for both hydrogen evolution and oxygen evolution reactions (HER and OER, respectively). For this, the current contribution reports the successful synthesis of binary/ternary metal ferrites (Co x Ni 1−x Ferrite; x = 0.0, 0.1, 0.3, 0.5, 0.7, and 1.0) by a simple one-step microwave technique and subsequently discusses its chemical and electrochemical properties. The X-ray diffraction analysis substantiated the phase purity of the as-obtained catalysts with various compositions. Additionally, the morphology of the nanoparticles was identified via transmission electron microscopy. Further, the vibrating sample magnetometer justified the ferromagnetic character of the as-prepared products. The electrochemical measurements revealed that the as-prepared materials required the overpotentials of 422−600 and 419−467 mV for HER and OER, respectively, to afford current densities of 10 mA cm −2 . In the general sense, Ni cation substitution with Co influenced favorably toward both HER and OER. Among all synthesized electrocatalysts, Co 0.9 Ni 0.1 Ferrite displayed the highest performance in terms of OER in 1 M KOH solution, which is related to the synergistic effect of multiple parameters including the optimal substitution amount of Co, the highest Brunauer−Emmett−Teller surface area, the smallest particle size among all samples (26.71 nm), and the lowest charge transfer resistance. The successful synthesis of ternary ferrites carried out for the first time via a microwave-assisted auto-combustion route opens up a new path for their applications in renewable energy technologies.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary Co_xNi_1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

et al. 2021

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“…Co oxides/hydroxides with different morphologies were found to be efficient OER catalysts, including mesoporous Co 3 O 4 , , urchin-like Co 3 O 4 , Co 3 O 4 nanosheets, Co 3 O 4 nanoparticle, , and Co 3 O 4 nanowires . Despite the high activity of Co-based oxides and hydroxides toward OER, their weak conductivity restricts their use as functional electrocatalysts . To overcome this issue, two approaches are being investigated in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome this issue, two approaches are being investigated in the literature. While the first approach is based on the use of highly conducting substrate, the second approach involves the formation of composite materials with other TMs, thus tuning the band gap and enhancing the conductivity . On the other hand, Mn-based catalysts are efficient water oxidation catalysts. , However, their catalytic activity toward OER is far below the outstanding activity of IrO 2 , RuO 2 , or Ni–Fe oxide anodes.…”

Section: Introductionmentioning

confidence: 99%

Highly Durable Compositionally Variant Bifunctional Tetrametallic Ni–Co–Mn–Fe Phosphide Electrocatalysts Synthesized by a Facile Electrodeposition Method for High-Performance Overall Water Splitting

et al. 2022

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In the recent few decades, the demand for green sources of energy that are clean and sustainable became very essential to reduce the greenhouse and global warming problems. Consequently, there is an increasing demand to identify nonprecious, cheap bifunctional electrocatalysts for water splitting. Herein, nanosheets of different earth-abundant Ni, Co, Mn, and Fe combinations are electrodeposited over commercial Ti mesh and tested for the overall water splitting. The bare Ti mesh requires overpotentials of −486.6 mV at −10 mA cm −2 and 534.5 mV at 10 mA cm −2 for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. However, the electrodeposited catalysts show much higher catalytic activity for both HER and OER with overpotentials of −300 and 279 mV at −10 and 10 mA cm −2 , respectively, lowering the overpotential needed to drive the OER by 50%. Nevertheless, to enhance the electrocatalytic performance of the fabricated catalysts, they are phosphidized using different phosphorous precursors. The resulted NiCoMnFe−P catalysts exhibit much lower HER overpotential (−200 mV at −10 mA cm −2 ), which is 40% lower than that needed by the bare Ti mesh. For the overall water splitting, a cell voltage of 1.71 V is recorded to achieve a current density of 10 mA cm −2 . Lastly, the stability test of the overall device reveals very high stability with current retention of 90% over 22 h of continuous electrolysis. Furthermore, the synergy between the metallic components in the absence and presence of P is elucidated using density functional theory calculations, revealing optimized G H* and G Hd 2 O* for the HER reaction over the P-top site of the MnFeCoNiP catalyst. In addition, the calculations explain the superiority of the NiCoMnFe catalyst over the NiCoMnFeP counterpart for the OER.

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Recent Advances in Ni‐Based Electrocatalysts for Hydrogen Evolution Reaction

Zeng

et al. 2022

Energy Tech

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Electrochemical water splitting driven by the electricity generated from renewable energy is an ideal sustainable approach for hydrogen production, where an efficient hydrogen evolution reaction (HER) electrocatalyst is indispensable. Ni-based electrocatalysts are widely investigated for HER in different electrolytes due to their advantages of high Earth abundance, remarkable corrosion resistance, efficient electrocatalytic performance, and high electrical conductivity. Although several Ni-based electrocatalysts exhibit catalytic HER performance comparable to that of state-of-the-art Pt catalysts, it is still lack of practical applications possibly due to the duration limitation. In order to promote the nextstep intensive studies and applications, it is important to systematically summarize the progress of Ni-based electrocatalysts for HER. Accordingly, this review article focuses on the recent advances in Ni-based electrocatalysts toward HER, which includes the mechanism of the electrocatalytic HER in different electrolytes and progresses in the Ni-based electrocatalysts toward HER. The preparation approaches, electrocatalytic activities, and overall performance comparison of the Ni-based electrocatalysts are systemically summarized based on Ni-based compounds, that is, phosphides, chalcogenides, nitrides, carbides, borides, alloys, and (hydro)oxides. The improvement modulation strategies including morphological/phase control, heterostructures/heterointerfaces, defect engineering, composite engineering, and heteroatom doping are thoroughly discussed. Finally, corresponding challenges and perspectives are proposed.

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Cobalt-Based Electrocatalysts for Water Splitting: An Overview

Cited by 19 publications

References 208 publications

Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary Co_xNi_1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary Co_xNi_1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

Highly Durable Compositionally Variant Bifunctional Tetrametallic Ni–Co–Mn–Fe Phosphide Electrocatalysts Synthesized by a Facile Electrodeposition Method for High-Performance Overall Water Splitting

Recent Advances in Ni‐Based Electrocatalysts for Hydrogen Evolution Reaction

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Cobalt-Based Electrocatalysts for Water Splitting: An Overview

Cited by 19 publications

References 208 publications

Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary CoxNi1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary CoxNi1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

Highly Durable Compositionally Variant Bifunctional Tetrametallic Ni–Co–Mn–Fe Phosphide Electrocatalysts Synthesized by a Facile Electrodeposition Method for High-Performance Overall Water Splitting

Recent Advances in Ni‐Based Electrocatalysts for Hydrogen Evolution Reaction

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Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary Co_xNi_1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution

Microwave-Assisted Auto-Combustion Synthesis of Binary/Ternary Co_xNi_1−xFerrite for Electrochemical Hydrogen and Oxygen Evolution