Flower-like nickel-cobalt oxide nanomaterials as bi-functional catalyst for electrochemical water splitting

Elakkiya, Rajasekaran; Ramkumar, Rajendran; Maduraiveeran, Govindhan

doi:10.1016/j.materresbull.2019.04.016

Cited by 53 publications

(19 citation statements)

References 63 publications

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“…This performance was compared with those of recently reported oxide-based EWS systems (Figure 7d). [78,85,87,91,92,94,96,[102][103][104][105] The obtained results confirmed that CMO-U@CC exhibited improved electrocatalytic activity with faster kinetics and good stability.…”

Section: Aqueous Rechargeable Zinc-air Battery-driven Electrochemical Water Splittingsupporting

confidence: 64%

“…Figure 5f shows the better HER activity of the CMO-U@CC electrode compared with those of other reported oxide-based electrocatalysts. [70,78,[85][86][87][90][91][92][93][94][95][96][97][98][99] After the HER process, the CMO-U@CC electrode was analyzed via XPS, XRD, and FESEM. The XPS results (Figure S11a-c, Supporting Information) revealed the compositional changes on the surface of the electrocatalyst after the electrocatalytic HER.…”

Section: Her Electrocatalytic Activitymentioning

confidence: 99%

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In Situ Grown CoMn₂O₄ 3D‐Tetragons on Carbon Cloth: Flexible Electrodes for Efficient Rechargeable Zinc–Air Battery Powered Water Splitting Systems

Janani

Surendran

Choi

et al. 2021

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oxygen evolution reaction and oxygen reduction reaction (OER and ORR) play important roles in rechargeable zinc-air battery (ZAB), whereas OER and hydrogen evolution reaction (HER) are the core reactions in EWS. [4,5] These electrochemical reactions exhibit sluggish kinetics because they require multistep protoncoupled electron transfers, which increase the overpotentials of the systems, thus causing the losses of considerable energy and long-term electrocatalytic activity. [6][7][8][9] Multifunctional electrocatalysts that efficiently catalyzes diverse electrochemical reactions (OER, HER, and ORR) have recently attracted considerable attention. Multifunctional electrocatalysts can reduce the manufacturing cost of the specific electrocatalysts for various electrochemical systems. The state-of-the-art catalysts such as Pt-based electrocatalysts (ORR and HER), IrO 2 and RuO 2 (OER) could not meet the characteristics of ideal multifunctional electrocatalysts because of high cost, non-abundancy, and non-multifunctional electrocatalytic activity. [10] Moreover, there are limited reports on the strategies for synthesizing multi functional electrocatalysts with intense activity, stability, and selectivity; [11][12][13] and this has necessitated the development of inexpensive, abundant, efficient, and stable multifunctional electrocatalysts to substitute the noble metal-based electrocatalysts.Transition metal oxides (TMOs) have been recently identified as the most promising alternatives to noble metal-based electrocatalysts because of their natural abundance, environmental sustainability, and superior thermal and chemical stabilities under different operating conditions. [14][15][16][17][18] A few promising TMOs exhibit spinel structures, especially cobalt oxide, because Co in its d 7 state with unpaired electrons enhances the activation and polarization of media and the presence of different valences encourage electron transfer during ORR, OER, and HER. Similarly, manganese oxides are inexpensive and abundant materials that promote natural OER in plants, as well as the desired four-electron pathway toward ORR; however, the poor electronic conductivity of manganese oxides limits their electrocatalytic activity. To overcome these limitations, manganese oxide can be combined with cobalt as a co-metal in the spinel structure. Further, increasing the surface area and amounts of Mn 3+ and Mn 2+ can considerably enhance the The integration of energy conversion and storage systems such as electrochemical water splitting (EWS) and rechargeable zinc-air battery (ZAB) is on the vision to provide a sustainable future with green energy resources. Herein, a unique strategy for decorating 3D tetragonal CoMn 2 O 4 on carbon cloth (CMO-U@CC) via a facile one-pot in situ hydrothermal process, is reported. The highly exposed morphology of 3D tetragons enhances the electrocatalytic activity of CMO-U@CC. This is the first demonstration of such a bifunctional activity of CMO-U@CC in an EWS system; it achieves a nominal cell voltage of 1.610 ...

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Section: Aqueous Rechargeable Zinc-air Battery-driven Electrochemical Water Splittingsupporting

confidence: 64%

Section: Her Electrocatalytic Activitymentioning

confidence: 99%

In Situ Grown CoMn₂O₄ 3D‐Tetragons on Carbon Cloth: Flexible Electrodes for Efficient Rechargeable Zinc–Air Battery Powered Water Splitting Systems

Janani

Surendran

Choi

et al. 2021

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“…It demanded the overpotential of 370 mV at 10 mA cm À2 , which is higher activity than NiO and Co 3 O 4 comprising the nickel-cobalt oxide nanomaterials. 62 where h is the overpotential, a is a constant, b is the Tafel slope, and j is the current density. The calculated Tafel slopes are 128, 157, 120, 135, 131 and 113 mV dec À1 for electrodes with compositions x ¼ 0, 0.2, 0.4, 0.6, 0.8, and 1, respectively.…”

Section: Hydrogen Evolution Reaction (Her)mentioning

confidence: 99%

Solventless synthesis of nanospinel Ni_1−xCo_xFe₂O₄ (0 ≤ x ≤ 1) solid solutions for efficient electrochemical water splitting and supercapacitance

et al. 2021

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“…Among those alternative electrocatalysts reported for water electrocatalysis, first-row transition metal-based catalysts (TMs), such as Fe, Co, and Ni, have drawn considerable attention due to their improved activity [ 18 , 19 , 20 , 21 ]. Owing to their higher abundance, low cost, and environmental friendliness, TMs, and their oxides [ 22 ], hydroxides [ 23 ], chalcogenides [ 24 ], and phosphides [ 25 ], have shown potential applications as OER catalyst alternative to precious metals. Among various nonprecious metal-based OER electrocatalysts that have been studied so far, transition metal layered double hydroxides (TM-LDHs) with two-dimensional (2D) structures have invoked a lot of attention lately [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Transition Metal-Based 2D Layered Double Hydroxide Nanosheets: Design Strategies and Applications in Oxygen Evolution Reaction

et al. 2021

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Water splitting driven by renewable energy sources is considered a sustainable way of hydrogen production, an ideal fuel to overcome the energy issue and its environmental challenges. The rational design of electrocatalysts serves as a critical point to achieve efficient water splitting. Layered double hydroxides (LDHs) with two-dimensionally (2D) layered structures hold great potential in electrocatalysis owing to their ease of preparation, structural flexibility, and tenability. However, their application in catalysis is limited due to their low activity attributed to structural stacking with irrational electronic structures, and their sluggish mass transfers. To overcome this challenge, attempts have been made toward adjusting the morphological and electronic structure using appropriate design strategies. This review highlights the current progress made on design strategies of transition metal-based LDHs (TM-LDHs) and their application as novel catalysts for oxygen evolution reactions (OERs) in alkaline conditions. We describe various strategies employed to regulate the electronic structure and composition of TM-LDHs and we discuss their influence on OER performance. Finally, significant challenges and potential research directions are put forward to promote the possible future development of these novel TM-LDHs catalysts.

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Flower-like nickel-cobalt oxide nanomaterials as bi-functional catalyst for electrochemical water splitting

Cited by 53 publications

References 63 publications

In Situ Grown CoMn₂O₄ 3D‐Tetragons on Carbon Cloth: Flexible Electrodes for Efficient Rechargeable Zinc–Air Battery Powered Water Splitting Systems

In Situ Grown CoMn₂O₄ 3D‐Tetragons on Carbon Cloth: Flexible Electrodes for Efficient Rechargeable Zinc–Air Battery Powered Water Splitting Systems

Solventless synthesis of nanospinel Ni_1−xCo_xFe₂O₄ (0 ≤ x ≤ 1) solid solutions for efficient electrochemical water splitting and supercapacitance

Transition Metal-Based 2D Layered Double Hydroxide Nanosheets: Design Strategies and Applications in Oxygen Evolution Reaction

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Flower-like nickel-cobalt oxide nanomaterials as bi-functional catalyst for electrochemical water splitting

Cited by 53 publications

References 63 publications

In Situ Grown CoMn2O4 3D‐Tetragons on Carbon Cloth: Flexible Electrodes for Efficient Rechargeable Zinc–Air Battery Powered Water Splitting Systems

In Situ Grown CoMn2O4 3D‐Tetragons on Carbon Cloth: Flexible Electrodes for Efficient Rechargeable Zinc–Air Battery Powered Water Splitting Systems

Solventless synthesis of nanospinel Ni1−xCoxFe2O4 (0 ≤ x ≤ 1) solid solutions for efficient electrochemical water splitting and supercapacitance

Transition Metal-Based 2D Layered Double Hydroxide Nanosheets: Design Strategies and Applications in Oxygen Evolution Reaction

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In Situ Grown CoMn₂O₄ 3D‐Tetragons on Carbon Cloth: Flexible Electrodes for Efficient Rechargeable Zinc–Air Battery Powered Water Splitting Systems

In Situ Grown CoMn₂O₄ 3D‐Tetragons on Carbon Cloth: Flexible Electrodes for Efficient Rechargeable Zinc–Air Battery Powered Water Splitting Systems

Solventless synthesis of nanospinel Ni_1−xCo_xFe₂O₄ (0 ≤ x ≤ 1) solid solutions for efficient electrochemical water splitting and supercapacitance