Propping the electrochemical impedance spectra at different voltages reveals the untapped supercapacitive performance of materials

Badawy, I.; Elbanna, Abdussalam M.; Ramadan, Mohamed; Allam, Nageh K.

doi:10.1016/j.electacta.2022.139932

Cited by 21 publications

(19 citation statements)

References 89 publications

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“…In addition, the GCD profiles are nearly symmetric and reveal a prominent voltage plateau (Figure c,d), implying the apparent Faradaic behavior of the P v -NiFeZnP||AC asymmetric supercapacitor, in accordance with the CV results . Meanwhile, the IR-drop is particularly undesirable from an industrial standpoint as it might result in significant power losses . By and large, there is no discernible IR-drop in the P v -NiFeZnP||AC asymmetric supercapacitor profiles of GCD, as depicted in Figure c,d.…”

Section: Resultssupporting

confidence: 69%

NiFeZnP Nanosheets with Enriched Phosphorus Vacancies for Supercapattery Electrodes

Sharkawy

Saleh

Elbanna

et al. 2023

ACS Appl. Nano Mater.

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Designing and fabricating outstanding electrode materials via simple preparation routes are viable ways for improving the performance of electrochemical supercapacitors. We report on the synthesis of NiFeZn phosphide interconnected nanosheets with abundant phosphorus vacancies (P v -NiFeZnP) via a facile reduction route at room temperature. The fabricated P v -NiFeZnP was fully characterized using energy-dispersive spectroscopy, field emission scanning electron microscopy, electron paramagnetic resonance, and X-ray photoelectron spectroscopy techniques. Owing to the porous interconnected nanosheet structure and the superior stability enabled by the direct binder-free growth on Ni foam, the P v -NiFeZnP electrode, with optimized phosphorus vacancy formation, exhibits a superb electrochemical performance of 631.8 mC/cm 2 (equivalent to 1579.5 mF/cm 2 ), which is significantly higher than those reported in the literature. Also, the P v -NiFeZnP||activated carbon asymmetric device exhibits a very high Coulombic efficiency (∼100%) and excellent long-term stability (98.8% capacity retention after 7500 cycles). The fabricated device can deliver 122.1 μWh/cm 2 energy density at a power density of 750 μW/cm 2 . The fabricated NiFeZnP electrode is therefore a promising candidate for supercapacitor applications.

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Section: Resultssupporting

confidence: 69%

NiFeZnP Nanosheets with Enriched Phosphorus Vacancies for Supercapattery Electrodes

Sharkawy

Saleh

Elbanna

et al. 2023

ACS Appl. Nano Mater.

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“…The curves indicate the superior reversibility, electric conductivity, and ionic conductivity of the fabricated electrode over a range of current densities (1–10 A g –1 ), consistent with the CV profile. The electrode’s specific capacity ( C ) is calculated from the galvanostatic charge/discharge (GCD) graphs using eq . , C s = I Δ t m where I is the discharge current (A), m is the loaded active material mass (g), and t is the discharge time (s). The acquired specific gravimetric capacity of the FNPS electrode showed the trend of 1415.20, 1347.20, 1029.20, 809.20, 691.20, and 600 C g –1 at 1, 2, 3, 5, 7, and 10 A g –1 , respectively (Figure d).…”

Section: Results and Discussionmentioning

confidence: 99%

Tuned Bimetallic Fe–Ni Thiophosphides as Advanced Battery Materials for Asymmetric Electrochemical Supercapacitors with Outstanding Energy Density

Sharkawy

Teama

Allam

2022

ACS Appl. Eng. Mater.

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The facile fabrication of functional supercapacitor electrodes with desirable characteristics is a bottleneck challenge to advance the supercapacitor industry. Among those functional materials, metal phosphides and sulfides have been explored separately with various pros and cons. Herein, we report a facile one-step electrodeposition method for the preparation of bimetallic thiophosphide (FNSP) based electrodes that comprise the advantages of both sulfides and phosphides simultaneously. Upon use as a supercapacitor electrode, FNSP shows an exceptionally high specific capacity of 1415.20 C/g at 1 A/g. Moreover, the assembled AC//FNSP asymmetric device reveals outstanding performance with a high energy density of 52.42 Wh/kg corresponding to a power density of 1.70 kW/kg at 2 A/g with superior Coulombic efficiency and cycling stability over 10 000 cycles. The obtained performance metrics demonstrate the superb performance of the fabricated AC// FNSP device over the sulfide or phosphide alone based devices reported so far. The exceptional specific capacitance of the FNSP electrode is attributed to the synergy between S and P in the fabricated electrode that improves the conductivity and provides more electrochemical active sites.

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“…Besides, Ni/Sn doping extends the light absorption toward higher wavelengths, and this, in turn, will probably increase the charge carrier’s generation. , Also, this annealing temperature was assumed to activate Ni dopants and stimulate a complete formation of the crystalline photoactive brookite phase. That, in turn, could be ascribed to the improved conductivity by providing organized as well as less-resistive pathways for photogenerated electrons and ease charge carriers diffusion at the semiconductor/electrolyte interface (SEI). , TN8-450 photoelectrode showed lower photocurrent density than the TN8-500 electrode at −0.2 V SCE (Figure S7), while both have the same crystallographic phase. Therefore, this difference may be attributed to in-equal degrees of crystallinity (Figure b), which impacts the photoactivity of the material .…”

Section: Resultsmentioning

confidence: 99%

“…That, in turn, could be ascribed to the improved conductivity by providing organized as well as less-resistive pathways for photogenerated electrons and ease charge carriers diffusion at the semiconductor/electrolyte interface (SEI). 86,88 TN8-450 photoelectrode showed lower photocurrent density than the TN8-500 electrode at −0.2 V SCE (Figure S7), while both have the same crystallographic phase. Therefore, this difference may be attributed to in-equal degrees of crystallinity (Figure 3b), which impacts the photoactivity of the material.…”

Section: Optical and Photoelectrochemicalmentioning

confidence: 99%

Stabilized Brookite Nanotube Array Films Grown on Transparent Substrates for Photoelectrochemical Water Splitting

et al. 2023

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Photoelectrochemical water splitting is a promising route to realizing a clean energy economy. Herein, we report on the ability to selectively fabricate optimized Ni-doped brookite nanotube array films on fluorine-doped tin oxide (FTO) substrate using ultrarapid radio frequency sputtering followed by electrochemical anodization and thermal annealing under ambient air. Ni doping promotes photocatalytic performance by introducing impurity bands within the TiO 2 bandgap. Further, annealing at various temperatures helps to tune the photoactivity of the fabricated photoelectrodes, which is in agreement with the nature of the trap states. The nanotubes enjoy high crystallinity and enhanced photoresponse with a noticeable bandgap of 2.7 eV. The Mott−Schottky analysis reveals the variation in the charge carriers density of the fabricated nanotubes. Most importantly, the electrochemical impedance spectroscopy (EIS) analysis unravels the involved kinetics and helps to determine the charge transfer properties of the annealed nanotubular films under opencircuit voltage (OCV) and with applied potential under dark and illumination conditions. EIS analysis reveals decreased charge transfer resistance under illumination, in agreement with the obtained photocurrent, electron lifetime, and density of trap states.

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Propping the electrochemical impedance spectra at different voltages reveals the untapped supercapacitive performance of materials

Cited by 21 publications

References 89 publications

NiFeZnP Nanosheets with Enriched Phosphorus Vacancies for Supercapattery Electrodes

NiFeZnP Nanosheets with Enriched Phosphorus Vacancies for Supercapattery Electrodes

Tuned Bimetallic Fe–Ni Thiophosphides as Advanced Battery Materials for Asymmetric Electrochemical Supercapacitors with Outstanding Energy Density

Stabilized Brookite Nanotube Array Films Grown on Transparent Substrates for Photoelectrochemical Water Splitting

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