Electrochemical fabrication of 3D quasi-amorphous pompon-like Co-O and Co-Se hybrid films from choline chloride/urea deep eutectic solvent for efficient overall water splitting

Yang, Wei; Hua, Yaxin; Zhang, Q.B.; Lei, Hao; Xu, Cunying

doi:10.1016/j.electacta.2018.04.054

Cited by 34 publications

(6 citation statements)

References 68 publications

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“…When used as a bifunctional catalyst in 1 m KOH electrolyte, a bias voltage of 1.51 V was needed to achieve a current density of 10 mA cm −2 toward water‐splitting. Recently, PCo nanoparticles [ 151 ] and Co–O@Co–Se films [ 152 ] were also constructed using the designed DESs containing Co 2+ cations as the electrodeposition media. The electrodeposited Co‐based catalysts showed good activity and durability for electrocatalytic overall water splitting.…”

Section: Dess For Electrocatalytic Applicationsmentioning

confidence: 99%

Deep Eutectic Solvents for Boosting Electrochemical Energy Storage and Conversion: A Review and Perspective

Liang

et al. 2021

Adv Funct Materials

190

163

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The pursuit of sustainable energy utilization arouses increasing interest in efficiently producing durable battery materials and catalysts with minimum environmental impact. As green, safe, and cheap eutectic mixtures, deep eutectic solvents (DESs) provide tremendous opportunities and open up attractive perspectives as charge transfer and reaction media for electrochemical energy storage and conversion (EESC). In this review, the fundamental properties of DESs are first summarized. Then, the important roles that DESs play in various EESC technologies including advanced electrolytes for batteries/supercapacitors, media for the preparation of electrode materials and catalysts, and extracting agents for battery recycling are systematically reviewed. A particular focus is placed on the fundamental understanding of structure-composition-property-performance relationships. Finally, the challenges for the controllable design of DESs for EESC applications and future developments are presented. This review is expected to shed light on developing advanced DESs for next-generation EESC systems.

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Section: Dess For Electrocatalytic Applicationsmentioning

confidence: 99%

Deep Eutectic Solvents for Boosting Electrochemical Energy Storage and Conversion: A Review and Perspective

Liang

et al. 2021

Adv Funct Materials

190

163

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“…The porous architecture with high specific area offers efficient ion and gas transfer pathway, exhibiting low overpotential and durable stability . However, the catalysts mentioned above were generally synthesized via multistep time-consuming approaches such as solvothermal and hydrothermal methods, which require high-pressure condition and the use of expensive organic ingredients, thus making their practical applications problematic. ,− Even worse, among these preparation processes, polymeric binders are usually needed to prepare robust coatings, which may result in unsatisfactory catalytic performance owing to the underutilization of accessible catalytic sites, poor electric conductivity, and undesirable surface wettability. , On the other hand, the abundant forms of cobalt sulfides also bring difficulties to the precise phase and composition control of these materials . Therefore, it is highly neccessary while remain challenging to develop straightforward yet reliable methods to synthesize cobalt sulfides with the novel structure, controlled phase, and composition to investigate their bifunctional catalytic activity for the OER and ORR.…”

Section: Introductionmentioning

confidence: 99%

In Situ Electrodeposition of Cobalt Sulfide Nanosheet Arrays on Carbon Cloth as a Highly Efficient Bifunctional Electrocatalyst for Oxygen Evolution and Reduction Reactions

Liu

Kou

et al. 2018

ACS Appl. Mater. Interfaces

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As one of the advanced cobalt-based materials, cobalt sulfides with novel architecture have attracted huge interest due to the low cost, easy availability, and promising bifunctional activity for both the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), which is essential for next-generation energy storage devices. Herein, we demonstrated a facile and clean electrochemical technique to directly synthesize CoS nanosheets with high purity onto the surface of carbon cloth, and a quick thermal treatment was performed to further improve the catalytic performance (CoS-A). This novel electrochemical technique avoids the use of the binder, surfactant, and other organic additives, which may cause poor electric conductivity as well as undesirable surface wettability, exhibiting great potential of the large-scale applications. The obtained CoS-A exhibits a superior electrocatalytic performance for the OER and ORR, with a high ORR current density (-1.51 mA cm at 0.2 V), considerable OER current density (148 mA cm at 1.9 V), and excellent durability in continuous measurement for over 12 h. The approach offers a powerful yet simple method to control the phase, composition, and morphology of a highly active CoS catalyst, which provides a new idea for the design of high-performance catalysts.

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“…Therefore, its activity is still insufficient for the large-scale hydrogen production and needs to be further improved. To accomplish this, intensive efforts have been made to enhance the HER catalysis of these nickel based materials. − Engineering the electronic structure of a catalyst to optimize hydrogen adsorption free energy has been demonstrated to be an efficient approach in improving the intrinsic activity, which can be achieved through non-metal-anion (S, P, Se) doping/alloying. − For instance, P doping/substitution into the Ni structure was found to tune the electronic structure of the catalyst and reduce the energy barrier for hydrogen adsorption, thus enhancing its HER activity . It was proposed that the enhancement was related to an ensemble effect within it, where the P and Ni acted as the proton- and hydride-acceptor centers, respectively, that worked together to facilitate the HER .…”

Section: Introductionmentioning

confidence: 99%

Direct Electrodeposition of Phosphorus-Doped Nickel Superstructures from Choline Chloride–Ethylene Glycol Deep Eutectic Solvent for Enhanced Hydrogen Evolution Catalysis

Sun

Lei

et al. 2018

ACS Sustainable Chem. Eng.

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Hydrogen produced by electrochemical water splitting offers a hopeful and renewable solution to address the global energy crisis; however, development of highly efficient hydrogen generation electrocatalysts remains a big challenge. Herein, self-supported P-doped nickel superstructure films (NiP x ) developed on Cu foil were prepared via a facile one-step electrodeposition route from the choline chloride−ethylene glycol (Ethaline)-based deep eutectic solvent (DES). Two depositional patterns including potentiostatic deposition and a consecutive potential cycling approach were compared, and the latter model with a potentiodynamic control was found to be a valid electrochemical protocol to create crack-free NiP x films which were highly active for catalyzing hydrogen evolution reaction (HER) under an alkaline condition. The optimal deposited sample with a Ni/P ratio of 1:0.056 achieved a low overpotential of 105 mV to deliver a current density of 10 mA cm −2 with a small Tafel slope of 44.7 mV dec −1 and excellent catalytic stability for at least 60 h. Detailed experimental investigations coupled with theoretical analyses revealed that the high-performance catalytic activity of the NiP x films originated from the enriched active sites and enhanced electronic conductivity induced by P-doping, which also altered the surface electronic structure of the material and resulted in a lower energy barrier for water dissociation and favorable H adsorption free energy. This study provides a new electrochemical potentiodynamic strategy performed in DES for the fabrication of transition-metal-phosphidebased catalysts for enhancing HER catalysis.

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Electrochemical fabrication of 3D quasi-amorphous pompon-like Co-O and Co-Se hybrid films from choline chloride/urea deep eutectic solvent for efficient overall water splitting

Cited by 34 publications

References 68 publications

Deep Eutectic Solvents for Boosting Electrochemical Energy Storage and Conversion: A Review and Perspective

Deep Eutectic Solvents for Boosting Electrochemical Energy Storage and Conversion: A Review and Perspective

In Situ Electrodeposition of Cobalt Sulfide Nanosheet Arrays on Carbon Cloth as a Highly Efficient Bifunctional Electrocatalyst for Oxygen Evolution and Reduction Reactions

Direct Electrodeposition of Phosphorus-Doped Nickel Superstructures from Choline Chloride–Ethylene Glycol Deep Eutectic Solvent for Enhanced Hydrogen Evolution Catalysis

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