Kinetically well-matched porous framework dual carbon electrodes for high-performance sodium-ion hybrid capacitors

Li, Chao; Cao, Kangzhe; Fan, Yang; Li, Qing; Zhang, Yu; Guo, Ziyang

doi:10.1016/j.jcis.2023.08.162

Cited by 16 publications

(5 citation statements)

References 74 publications

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“…(B) Potential profile of the anode, cathode, and the full cell during a 0.2 A g –1 charge/discharge cycle of SHC-P//SPC in a three-electrode setup. (C) Ragone plot of the SHC-P//SPC in comparison with other studies ,− reported in the literature. (D) Graph demonstrates the long-term cycling stability of SHC-P//SPC at 5 A g –1 , with a notable capacity retention of 71% after 25,000 cycles.…”

Section: Resultsmentioning

confidence: 91%

Enhancing Specific Energy in Sodium-Ion Hybrid Capacitors via Quasi-Anodeless Configuration

Surendran,

Thangadurai

2024

ACS Appl. Energy Mater.

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Sodium-ion hybrid capacitors (Na-HCs) often experience limited rate capabilities due to the inherent challenges of hard carbon anodes, such as sloped discharge profiles and poor kinetics. Despite this, the effectiveness of hard carbon for sodium plating opens opportunities beyond its conventional use. Leveraging this property, we explore hard carbon as a 3D current collector for Na deposition, aiming to employ it as an efficient anode material in Na-HCs. A key advancement in our approach is the employment of a lean hard carbon anode with ultralow loading (<0.3 mg cm −2 ), which significantly elevates the cell's energy density. This design boosts the energy density of the cell by operating the anode at a stable potential near 0 V, thereby increasing the operating voltage of the hybrid capacitor. Moreover, it enables the voltage profile of hybrid capacitors to resemble more closely that of porous carbon, contrasting with the typical dome-shaped profiles seen in standard hybrid capacitors. The implementation of this method has yielded a remarkable 40% increase in the specific energy. Our research provides a promising direction for the Na-HC community, showcasing a Na-HC that can operate for 25,000 cycles at a current density of 5 A g −1 while maintaining 71% of its capacity. This quasi-anodeless configuration, coupled with a judicious selection of electrode materials and electrolyte composition, marks a significant advancement in the quest for efficient and sustainable energy storage solutions.

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Section: Resultsmentioning

confidence: 91%

Enhancing Specific Energy in Sodium-Ion Hybrid Capacitors via Quasi-Anodeless Configuration

Surendran,

Thangadurai

2024

ACS Appl. Energy Mater.

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“…4d), which is due to the faster and less dependent nature of surface reactions compared to the diffusion of Na + within the electrode. 66 It should be mentioned that the high fraction of capacitive contribution indicates the dominant role of the surface capacitive behavior in the charge storage process, which plays an advantageous role in enhancing the rate and cycling properties of the MoO 2 /MoS 2 @NC anode during the Na-storage. In addition, the galvanostatic intermittent titration technique (GITT) was employed to evaluate the diffusion kinetics of the as-prepared MoO 2 /MoS 2 @NC, MoO 2 /MoS 2 , MoO 2 @NC, and MoS 2 anodes.…”

Section: Resultsmentioning

confidence: 99%

Facile construction of flower-like MoO₂/MoS₂ heterostructures encapsulated in nitrogen-doped carbon for high-performance sodium-ion storage

Li,

Cao,

et al. 2024

New J. Chem.

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“…Biochar electrode studies have become very popular in the last few years since the use of an abundant, inexpensive material originating from residual biomass is very attractive. Some applications like direct carbon fuel cells and supercapacitors have been reported [34][35][36][37][38]. The high SSA is a desirable characteristic but not crucial for the efficiency of the electrode.…”

Section: Introductionmentioning

confidence: 99%

Study of the Suitability of Corncob Biochar as Electrocatalyst for Zn–Air Batteries

Soursos,

Kottis,

Premeti

et al. 2024

Batteries

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There has been a recent increasing interest in Zn–air batteries as an alternative to Li-ion batteries. Zn–air batteries possess some significant advantages; however, there are still problems to solve, especially related to the tuning of the properties of the air–cathode which should carry an inexpensive but efficient bifunctional oxygen reduction (ORR) and oxygen evolution (OER) reaction electrocatalyst. Biochar can be an alternative, since it is a material of low cost, it exhibits electric conductivity, and it can be used as support for transition metal ions. Although there is a significant number of publications on biochars, there is a lack of data about biochar from raw biomass rich in hemicellulose, and biochar with a small number of heteroatoms, in order to report the pristine activity of the carbon phase. In this work, activated biochar has been made by using corncobs. The biomass was first dried and minced into small pieces and pyrolyzed. Then, it was mixed with KOH and pyrolyzed for a second time. The final product was characterized by various techniques and its electroactivity as a cathode was determined. Physicochemical characterization revealed that the biochar had a hierarchical pore structure, moderate surface area of 92 m2 g−1, carbon phase with a relatively low sp2/sp3 ratio close to one, and a limited amount of N and S, but a high number of oxygen groups. The graphitization was not complete while the biochar had an ordered structure and contained significant O species. This biochar was used as an electrocatalyst for ORR and OER in Zn–air batteries where it demonstrated a satisfactory performance. More specifically, it reached an open-circuit voltage of about 1.4 V, which was stable over a period of several hours, with a short-circuit current density of 142 mA cm−2 and a maximum power density of 55 mW cm−2. Charge–discharge cycling of the battery was achieved between 1.2 and 2.1 V for a constant current of 10 mA. These data show that corncob biochar demonstrated good performance as an electrocatalyst in Zn–air batteries, despite its low specific surface and low sp2/sp3 ratio, owing to its rich oxygen sites, thus showing that electrocatalysis is a complex phenomenon and can be served by biochars of various origins.

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Kinetically well-matched porous framework dual carbon electrodes for high-performance sodium-ion hybrid capacitors

Cited by 16 publications

References 74 publications

Enhancing Specific Energy in Sodium-Ion Hybrid Capacitors via Quasi-Anodeless Configuration

Enhancing Specific Energy in Sodium-Ion Hybrid Capacitors via Quasi-Anodeless Configuration

Facile construction of flower-like MoO₂/MoS₂ heterostructures encapsulated in nitrogen-doped carbon for high-performance sodium-ion storage

Study of the Suitability of Corncob Biochar as Electrocatalyst for Zn–Air Batteries

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Kinetically well-matched porous framework dual carbon electrodes for high-performance sodium-ion hybrid capacitors

Cited by 16 publications

References 74 publications

Enhancing Specific Energy in Sodium-Ion Hybrid Capacitors via Quasi-Anodeless Configuration

Enhancing Specific Energy in Sodium-Ion Hybrid Capacitors via Quasi-Anodeless Configuration

Facile construction of flower-like MoO2/MoS2 heterostructures encapsulated in nitrogen-doped carbon for high-performance sodium-ion storage

Study of the Suitability of Corncob Biochar as Electrocatalyst for Zn–Air Batteries

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Facile construction of flower-like MoO₂/MoS₂ heterostructures encapsulated in nitrogen-doped carbon for high-performance sodium-ion storage