Sulfur and phosphorus co-doped nickel–cobalt layered double hydroxides for enhancing electrochemical reactivity and supercapacitor performance

Kim, Kyung Soo; Shinde, Nanasaheb M.; Yun, Je Moon; Kim, Kwang Ho

doi:10.1039/d1ra00424g

Cited by 24 publications

(15 citation statements)

References 61 publications

(108 reference statements)

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“…Developing binder-free electrodes is not the only way to improve the capacitive performance of the desired electroactive material. An alternate effective approach is the incorporation of heteroatom doping with dissimilar atomic radii as well as suitable anchoring of the electroactive material on the template surface. , Theoretical and experimental calculations showed that the addition of anions (O, S, and Se) can regulate the overall electronic structure, upsurge the electronic conductivity of the material, and provide effective bridging between the template and electroactive materials, which is worthy of electrochemical energy storage. ,− It has also been scrutinized that Se-containing hybrid materials not only rejuvenate the rate capacity but also provide a superior cycle life because of its low ionization energy, high electronic conductivity, and better metallic properties compared to those of S and O. , In addition, Se-infiltrated TMP has the high synergistic effect among TMPs and Se, which can directly affect OH – ion adsorption of the surface. Thus, the modification of NiCoP along with 1D CNF via Se anchoring can easily modulate the electronic structure and density of states, which play a significant role in assisting the electrochemical performance.…”

Section: Introductionmentioning

confidence: 99%

Electrodes Based on Se Anchored on NiCoP and Carbon Nanofibers for Flexible Energy Storage Devices

Afshan¹,

Kumar²,

Rani³

et al. 2022

ACS Appl. Nano Mater.

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In an energy storage device, it is indeed a necessity to develop a flexible binder-free electrode. However, the rational design of such a binder-free electrode with high energy density and long cyclic stability is a great challenge for the scientific community. Herein, Se-anchored NiCoP nanoparticles have been developed that are in situ decorated on the surface of polyacrylonitrile-based heat-treated flexible carbon nanofibers (CNFs). The as-designed electrode demonstrates a remarkable specific capacitance/ capacity of 994 F g −1 /497 mAh g −1 at 1 A g −1 . The flexible solid-state symmetric supercapacitor (SSC) device delivers 76.86 Wh kg −1 energy density at a power density of 843.75 W kg −1 at 0.75 A g −1 and retains a promising energy density of 22.75 Wh kg −1 at an ultrahigh power density of 11250 W kg −1 at 10 A g −1 , respectively. The device also shows excellent long cyclic stability in terms of 94.12% capacitive retention along with 98.65% Coulombic efficiency after 15000 cycles at an applied high current density of 10 A g −1 . The synergetic effect of Se-anchored NiCoP with CNF along with the significant protection of NiCoP by a thin graphitic shell as well as suitable anchoring of electroactive materials on a CNF matrix via Se bridging may help to achieve such a high-performance energy storage device. The four sets of 1 × 1 cm 2 prototype devices (connected in series) are capable of enlightening a red-light-emitting diode (2.2 V) for 8 min and rotating a 3 V electric direct-current motor for 4 min via charging through a standard Si solar panel (6 V) illuminated by a 50 W street light for 2 min. The study creates an avenue toward the realistic drive of renewable energy conversion via the development of a high-performance flexible energy storage device.

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Section: Introductionmentioning

confidence: 99%

Electrodes Based on Se Anchored on NiCoP and Carbon Nanofibers for Flexible Energy Storage Devices

Afshan¹,

Kumar²,

Rani³

et al. 2022

ACS Appl. Nano Mater.

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“…Interestingly, Table S2 shows that increasing the urea concentration to 0.08 M (NMP-4) gradually increases the surface area, pore volume, and pore diameter, while the trend is reversed with a further increase of the urea concentration. The enhanced surface area with a high pore volume (and a drastic increase in the pore diameter) of the NMP-4 sample might be due to the dominance of microplate-like architectures with good mesoporosity, leading to improved electrolytic charge storage and ion transport and, ultimately, can result in enhanced supercapacitor features. , …”

Section: Resultsmentioning

confidence: 99%

Urea-Assisted Nickel-Manganese Phosphate Composite Microarchitectures with Ultralong Lifecycle for Flexible Asymmetric Solid-State Supercapacitors: A Binder-Free Approach

et al. 2022

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The limited energy density and cyclability of supercapacitors are major roadblocks to their development as energy storage devices. To address these issues, a binder-free nickel−manganese (Ni−Mn) phosphate composite (NMP series) microarchitecture has been synthesized by the hydrothermal method on a nickel foam (NF) substrate using various urea dosages. Due to the influence of urea, microrod-/microplate-like morphologies of NMP series thin films evolved to micropetals. This study demonstrates a synergy between Ni and Mn metal ions and also the influence of different urea contents on the physicochemical properties of mesoporous NMP series thin films. Notably, the NMP-4 microarchitecture has a large surface area (7.5 m 2 g −1 ), which provides more electroactive sites in electrochemical measurements. Accordingly, in the NMP series electrodes, the NMP-4 thin film demonstrated high electrochemical properties (the maximum specific capacity was found to be 901 C/g at a 5 mV/s scan rate) and retained 127% capacity over 6000 cycles, indicating good durability with a well-preserved microstructure throughout the cycling. Furthermore, a flexible asymmetric solid-state (FASS) supercapacitor was designed utilizing NMP-4 and reduced graphene oxide (rGO) as a cathode and an anode, respectively, in the poly(vinyl alcohol)-KOH (PVA-KOH) gel electrolyte with an extended operational voltage of +1.8 V. This FASS device provides a high specific capacity (192 C/g at 0.6 A/g current density), supreme energy density (48.2 Wh kg −1 ) at a power density of 575 W kg −1 , and a desirable longevity of 108% over 5000 cycles. Moreover, the FASS device also demonstrated its practical applicability. The long-term stability suggests that the binder-free urea-assisted Ni−Mn phosphate composite is a good candidate for energy storage devices.

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“…119 Kim et al developed an S and P co-doping strategy to enhance the electrocatalytic activity and supercapacitor performance of NiCo-LDH. 120 S and P co-doping can regulate the morphology of NiCo-LDH nanoarray (NiCo-LDH-SP). The heterogeneous porous structure effectively reduces charge transfer resistance, which achieves a rapid and efficient Faraday reaction.…”

Section: Non-metal Co-dopingmentioning

confidence: 99%

Heteroatom-doped transition metal hydroxides in energy storage and conversion: a review

Qin

Feng

et al. 2023

Mater. Adv.

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Sulfur and phosphorus co-doped nickel–cobalt layered double hydroxides for enhancing electrochemical reactivity and supercapacitor performance

Abstract: The optimized sulfur and phosphorus co-doped NiCo LDH reduces charge transfer resistance and realizes efficient redox reaction, achieving an outstanding specific capacitance of 3844.8 F g−1 at 3 A g−1.

Cited by 24 publications

References 61 publications

Electrodes Based on Se Anchored on NiCoP and Carbon Nanofibers for Flexible Energy Storage Devices

Electrodes Based on Se Anchored on NiCoP and Carbon Nanofibers for Flexible Energy Storage Devices

Urea-Assisted Nickel-Manganese Phosphate Composite Microarchitectures with Ultralong Lifecycle for Flexible Asymmetric Solid-State Supercapacitors: A Binder-Free Approach

Heteroatom-doped transition metal hydroxides in energy storage and conversion: a review

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