Efficient Co-N-C electrocatalysts for oxygen reduction derived from deep eutectic solvents

Pariiska, O. O.; Mazur, D. O.; Cherchenko, Kostyantyn; Kurys, Ya. I.; Koshechko, V. G.; Pokhodenko, V. D.

doi:10.1016/j.electacta.2022.140132

Cited by 8 publications

(8 citation statements)

References 43 publications

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“…Similarly, the [Bmim]Cl/Co(NO 3 ) 2 •6H 2 O-based DES was reported to provide a stable coordination environment for Co ions, thus promoting the uniform distribution of Co in the Co-N-C material. [58] DESs, as structure-directing agents, have been used to directionally control the size and shape of carbon-and metal-based nanomaterials. Polyethylene glycol 200 (PEG 200)/thiourea (TU)based DES with unique flexibility performs as an effective reaction medium for the synthesis of spherical urchin-like NiCo 2 S 4 [59] and Fe 3 S 4 nanosheets with wrinkled structure.…”

Section: Template Effectsmentioning

confidence: 99%

“…[129] Metal or non-metallic elements doping can introduce more defects via modulating the charge distribution around carbon atoms, thereby significantly improving the ORR activity of carbon catalysts. [58,130] However, the synthesis of such composites requires the use of unsafe reducing agents and dopants such as HI for reduction and functionalization. Interestingly, using ChCl/KI 3 -based DES as a reducing agent and I dopant is favorable to synthesizing high-performance I-functionalized graphene material in an environmentally friendly and simple route.…”

Section: Oxygen Reduction Reactionmentioning

confidence: 99%

“…In situ chemical reduction method ORR Onset potential: 0.25 V in 0.1 m KOH AHCl/EG-based DES (1:3 m) NPPCs [ 134] Solvent and monomer for polymerization Co-N-C [58] C/N precursor Heat-treated + acid treatment Onset potential: 0.97-0.99 V and 37-45 mV dec −1 in 1 m NaOH ChCl/Re/4CP-based DES (1:1:1 m) Nitrogen-doped carbons [ 132] N precursor and template Precondensation + heat-treated + carbonization Cathodic peak-centered at -0.24 V in 0.1 m KOH methods, the proposed synthesis route has good costeffectiveness and energy utilization efficiency.…”

Section: Mormentioning

confidence: 99%

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Solvent‐Mediated Synthesis of Functional Powder Materials from Deep Eutectic Solvents for Energy Storage and Conversion: A Review

Deng,

Gao,

Zhang

et al. 2023

Advanced Energy Materials

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Developing advanced electrochemical energy storage and conversion (ESC) technologies based on renewable clean energy can alleviate severe global environmental pollution and energy crisis. The efficient preparation of functional electrode materials via a simple, green, and safe synthesis process is the key to the commercial feasibility of these ESC systems. Deep eutectic solvents (DESs) with easy‐tunable solvent properties and recyclable features have emerged as novel solvent systems for designing and synthesizing various functional powder materials for ESC devices. In this paper, the application of DESs in the synthesis of energy‐related functional powder materials is systematically reviewed. After briefly introducing the classification and synthesis of DESs, their critical roles in synthesizing powder materials are discussed. Then, the recent advances of DES‐derived powder materials in ESC, including batteries, fuel cells, supercapacitors, and water splitting, are described in detail from the perspective of preparation‐structure‐activity. Finally, some challenges and development directions of the DESs‐mediated synthesis of powder materials with high electrochemical performance for ESC applications are outlined.

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Section: Template Effectsmentioning

confidence: 99%

Section: Oxygen Reduction Reactionmentioning

confidence: 99%

Section: Mormentioning

confidence: 99%

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Solvent‐Mediated Synthesis of Functional Powder Materials from Deep Eutectic Solvents for Energy Storage and Conversion: A Review

Deng,

Gao,

Zhang

et al. 2023

Advanced Energy Materials

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“…A bimetallic Co/Fe-2D-SA was also studied to investigate how the electronic properties of the neighboring metal and its activity are affected. Generally, iron- and cobalt-based materials exhibit excellent ORR and OER activity. − Complexes including nickel were not explored because nickel-based materials generally do not show high activity/selectivity toward ORR/OER when compared with iron- and cobalt-based materials. Due to the facile synthesis procedure of the MOF as outlined by Li et al and Liang et al, we predict that the synthesis method should be applicable to other transition metals. , Additionally, the activity of this catalyst was improved through the addition of a graphene substrate and via substrate doping.…”

Section: Introductionmentioning

confidence: 99%

Cooperative Agreement of Binuclear 2D Metal–Organic Framework Sites for Superior Bifunctional Oxygen Electrocatalysis

Helsel,

Choudhury

2024

J. Phys. Chem. C

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This work analyzes the bifunctional activity of a binuclear two-dimensional metal−organic framework fragment (2D-SA) utilizing ab initio spin-polarized density functional theory calculations. Cobalt, iron, and a combination of the two metals were simulated due to their history with promising oxygen reduction/oxygen evolution reactions (ORR/OER) activity. The favorable reaction pathways of both the ORR and OER have been realized including the addition of pristine/doped graphene substrate. The Co-2D-SAs had the best performance toward OER only, while the Fe-2D-SAs were favorable toward ORR. The results show that when the bimetallic Co/Fe-2D-SA was supported by graphene, both the ORR overpotential of the Fe site and the OER overpotential of the Co site were found to be the best for the bifunctional activity. This superior bifunctional activity is attributed to both the substrate effect and cooperative agreement between iron and cobalt in the bimetallic 2D-SA by adjusting their spin states due to the antiferromagnetic coupling of the binuclear sites.

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“…In addition to this, DES found application in the synthesis of different nanomaterials and also in the synthesis of carbon materials. DES are the new generation of carbon precursors which satisfy most green chemistry principles in carbon material synthesis [ 1 , 14 ]. The use of DES offers one-step synthesis route for preparation of different heteroatom-doped carbon materials.…”

Section: Introductionmentioning

confidence: 99%

Deep Eutectic Solvent for Facile Synthesis of Mn3O4@N-Doped Carbon for Aqueous Multivalent-Based Supercapacitors: New Concept for Increasing Capacitance and Operating Voltage

et al. 2022

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The capacitance and operating voltage of supercapacitors as well as their energy density have been increased by development of different materials and electrolytes. In this paper, two strategies, for the first time, were used to improve energy density: Mn3O4- and N-dual doped carbon electrode and aqueous mixture of multivalent ions as electrolyte. Mn3O4- and N-dual doped carbon was prepared by a novel and cost-effective procedure using deep eutectic solvent. XRD, XPS, and FTIR confirmed presence of Mn3O4 and nitrogen, while SEM and EDS elemental mapping showed micrometer-sized nanosheets with uniform distribution of C, O, N, and Mn atoms. Charge storage behavior of carbon was tested in aqueous multivalent-based electrolytes and their mixture (Ca2+-Al3+). Regarding both specific capacitance and workable voltage, the Ca2+-Al3+ mixed electrolyte was found as the best optimal solution. The calcium addition to the Al-electrolyte allows the higher operating voltage than in the case of individual Al(NO3)3 electrolyte while the addition of Al3+ ion in the Ca(NO3)2 electrolyte improves the multivalent-ion charge storage ability of carbon. As a result, the specific energy density of two-electrode Mn3O4@N-doped carbon//Al(NO3)2+Ca(NO3)2//Mn3O4@N-doped carbon supercapacitor (34 Wh kg−1 at 0.1 A g−1) overpasses the reported values obtained for Mn-based carbon supercapacitors using conventional aqueous electrolytes.

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Efficient Co-N-C electrocatalysts for oxygen reduction derived from deep eutectic solvents

Cited by 8 publications

References 43 publications

Solvent‐Mediated Synthesis of Functional Powder Materials from Deep Eutectic Solvents for Energy Storage and Conversion: A Review

Solvent‐Mediated Synthesis of Functional Powder Materials from Deep Eutectic Solvents for Energy Storage and Conversion: A Review

Cooperative Agreement of Binuclear 2D Metal–Organic Framework Sites for Superior Bifunctional Oxygen Electrocatalysis

Deep Eutectic Solvent for Facile Synthesis of Mn3O4@N-Doped Carbon for Aqueous Multivalent-Based Supercapacitors: New Concept for Increasing Capacitance and Operating Voltage

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