The complementary advanced characterization and electrochemical techniques for electrode materials for supercapacitors

Baig, Mutawara Mahmood; Gul, Iftikhar Hussain; Baig, Sherjeel Mahmood; Shahzad, Faisal

doi:10.1016/j.est.2021.103370

Cited by 35 publications

(11 citation statements)

References 186 publications

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“…It is visible that the Al 2 O 3 -reduced graphene oxide hybrid electrode has a lower Warburg region (the straight line at low frequency) compared to the bare Al 2 O 3 electrode, with solution resistance ( Rs ) and charge transfer resistance ( Rct ) values, 1.33 Ω and 16.67 Ω, respectively. The Al 2 O 3 -reduced graphene oxide hybrid electrode obtained a short diffusion path length for ion transfer, which could be noticed from the low resistance of the capacitive part on the Nyquist plot 44 . The Nyquist plot reveals that the Al 2 O 3 -reduced graphene oxide hybrid electrode has a higher electrical conductivity than the bare Al 2 O 3 electrode due to the inclusion of reduced graphene oxide, which greatly enhanced the overall electron transfer rate 45 .…”

Section: Resultsmentioning

confidence: 93%

Experimental and computational investigation on the charge storage performance of a novel Al2O3-reduced graphene oxide hybrid electrode

Ratha

Sahoo

Mane

et al. 2023

Sci Rep

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The advancements in electrochemical capacitors have noticed a remarkable enhancement in the performance for smart electronic device applications, which has led to the invention of novel and low-cost electroactive materials. Herein, we synthesized nanostructured Al2O3 and Al2O3-reduced graphene oxide (Al2O3-rGO) hybrid through hydrothermal and post-hydrothermal calcination processes. The synthesized materials were subject to standard characterisation processes to verify their morphological and structural details. The electrochemical performances of nanostructured Al2O3 and Al2O3- rGO hybrid were evaluated through computational and experimental analyses. Due to the superior electrical conductivity of reduced graphene oxide and the synergistic effect of both EDLC and pseudocapacitive behaviour, the Al2O3- rGO hybrid shows much improved electrochemical performance (~ 15-fold) as compared to bare Al2O3. Further, a symmetric supercapacitor device (SSD) was designed using the Al2O3- rGO hybrid electrodes, and detailed electrochemical performance was evaluated. The fabricated Al2O3- rGO hybrid-based SSD showed 98.56% capacity retention when subjected to ~ 10,000 charge–discharge cycles. Both the systems (Al2O3 and its rGO hybrid) have been analysed extensively with the help of Density Functional Theory simulation technique to provide detailed structural and electronic properties. With the introduction of reduced graphene oxide, the available electronic states near the Fermi level are greatly enhanced, imparting a significant increment in the conductivity of the hybrid system. The lower diffusion energy barrier for electrolyte ions and higher quantum capacitance for the hybrid structure compared to pristine Al2O3 justify improvement in charge storage performance for the hybrid structure, supporting our experimental findings.

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Section: Resultsmentioning

confidence: 93%

Experimental and computational investigation on the charge storage performance of a novel Al2O3-reduced graphene oxide hybrid electrode

Ratha

Sahoo

Mane

et al. 2023

Sci Rep

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“…The cyclic voltammetry plot of both Cl‐MXene and HF‐MXene is shown in Figure 8A for the comparison of their activities. Cl‐MXene showed a more integral area and stronger redox currents than ordinary HF‐MXene, which indicates the superior electrochemical behavior of Cl‐MXene 16,46‐48 . The peak at 1.4 V corresponds to the oxidation of nickel foam, while the peak at 1.47 V corresponds to the oxidation of the Cl‐MXene.…”

Section: Resultsmentioning

confidence: 96%

“…Cl-MXene showed a more integral area and stronger redox currents than ordinary HF-MXene, which indicates the superior electrochemical behavior of Cl-MXene. 16,[46][47][48] The peak at 1.4 V corresponds to the oxidation of nickel foam, while the peak at 1.47 V corresponds to the oxidation of the Cl-MXene. Figure 8B displayed a CV plot for Cl-MXene at different scan rates of 5-50 mV s À1 in the potential range of 0.8-1.6 V. It is obvious that peaks are observed in both OER and HER range indicating the reactions in both the zones (agreeing to Type-C curves 17,45,49 ).…”

Section: Electrochemical Investigationsmentioning

confidence: 99%

“…The 2D materials family is expanding at a rapid pace which saw several new materials such as transition metal dichalcogenides, hexagonal boron nitride (h‐BN), phosphorene, graphitic carbon nitride (g‐C 3 N 4 ), hexagonal boron nitride (h‐BN), and others 11‐14 . These active materials have found enormous potential for electrochemical water splitting and a variety of metal‐free catalysts or supports for water splitting have been reported 15‐22 . Among 2D materials, MXenes are a recent addition that possesses interesting electrochemical properties; largely caused by the presence of ample catalytic active sites, high electrical conductivity, and surface area 23 .…”

Section: Introductionmentioning

confidence: 99%

“…[11][12][13][14] These active materials have found enormous potential for electrochemical water splitting and a variety of metal-free catalysts or supports for water splitting have been reported. [15][16][17][18][19][20][21][22] Among 2D materials, MXenes are a recent addition that possesses interesting electrochemical properties; largely caused by the presence of ample catalytic active sites, high electrical conductivity, and surface area. 23 MXenes display good mechanical properties and are also declared to exhibit small or no band gaps, and should also show magnetic behaviors, depending on their surface termination.…”

Section: Introductionmentioning

confidence: 99%

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HF free greener Cl ‐terminated MXene as novel electrocatalyst for overall water splitting in alkaline media

Sarfraz

Mehran

Baig

et al. 2022

Intl J of Energy Research

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Summary Hydrogen and oxygen evolution through electrochemical water splitting is essential for effective and inexpensive production of hydrogen and oxygen, which depends on the development of economical, and extremely active electrocatalysts. Two‐dimensional (2D) nano‐laminated materials are imperious as electrocatalysts due to their phenomenal properties and extensive scope of applications. In this work, we report a greener way of synthesizing MXene without hydrofluoric acid (HF) treatment and demonstrated its excellent electrochemical characteristics as an overall water‐splitting catalyst. Cl‐terminated MXenes (Ti3C2Cl2) were synthesized via a molten salt approach, in which the MAX phase (Ti3AlC2) was reacted with copper chloride (CuCl2) salt followed by thermal treatment at a temperature of 550°C for 5 hours. The resulting Cl‐terminated MXene was characterized by scanning electron microscopy, X‐ray diffraction, transmission electron microscope, Raman, Fourier transform infrared spectroscopy, energy dispersive X‐ray analysis, X‐ray photoelectron spectroscopy, and electrochemical testing was performed in the alkaline media for oxygen evolution reactions (OER) and hydrogen evolution reactions (HER). For OER in 1 M KOH, Cl‐terminated MXene achieves a benchmark of 30 mA cm−2 current density at an overpotential of 330 mV and a Tafel slope of 48 mV dec−1, while HF‐MXene exhibits an overpotential of 390 mV and a Tafel slope of 136 mV dec−1. For HER, Cl‐MXene attains an overpotential of 259 mV, and a Tafel slope of 92 mV dec−1 to achieve the 10 mA cm−2 current density, on the other hand, HF‐MXene achieves an overpotential of 444 mV and a Tafel slope of 311 mV dec−1. Furthermore, the electrocatalyst exhibited excellent long‐term stability of 0.7 V at 100 mA cm−2 current density for 36 hours. The synthesis methodology for greener Cl‐terminated MXene coupled with an outstanding electrocatalytic activity is set to open new avenues of catalyst design for water splitting.

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Nanoarchitectonics of Nickel Nitride‐V₂CT_X Mxene: An Efficient Bifunctional Catalyst for Alkaline Water/Seawater Applications

Deepak,

Singh,

Mahapatra

et al. 2024

Advanced Sustainable Systems

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Seawater, being the most plentiful natural water source worldwide, is a highly abundant and cost‐efficient medium for producing hydrogen by alkaline water electrolysis. However, the advancement of seawater electrolysis is hindered by notable impediments caused by chloride corrosion at the anode and the simultaneous chlorine evolution process. Only a limited number of non‐noble electrocatalysts demonstrate noteworthy bifunctional catalytic efficacy and long‐term durability. In this regard, Nickel Nitride tailored V2CTX Mxene nanostructures is reported as a bifunctional catalyst for overall water/seawater applications. The optimized sample Ni3N@3000‐V2CTx exhibits low overpotential values of 90 and 300 mV in acidic and alkaline + seawater solutions respectively at 10 mA cm−2 for hydrogen evolution reaction. Similarly, this catalyst shows 70 and 240 mV overpotential values in alkaline water and alkaline + seawater solutions respectively at the same current density for oxygen evolution reaction. Synergetic effects of Multiple Vanadium and Nickel valency along with compelling nitrogen bonds creates elevated density of exposed functional sites for electrocatalytic activity. Furthermore, the notable electrochemical active surface area and mass activity suggest an enhanced and significant presence of abundant active sites. Additionally, the high stability and significantly decreased charge transfer resistance expedited the overall water/seawater‐splitting reaction rate.

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The complementary advanced characterization and electrochemical techniques for electrode materials for supercapacitors

Cited by 35 publications

References 186 publications

Experimental and computational investigation on the charge storage performance of a novel Al2O3-reduced graphene oxide hybrid electrode

Experimental and computational investigation on the charge storage performance of a novel Al2O3-reduced graphene oxide hybrid electrode

HF free greener Cl ‐terminated MXene as novel electrocatalyst for overall water splitting in alkaline media

Nanoarchitectonics of Nickel Nitride‐V₂CT_X Mxene: An Efficient Bifunctional Catalyst for Alkaline Water/Seawater Applications

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The complementary advanced characterization and electrochemical techniques for electrode materials for supercapacitors

Cited by 35 publications

References 186 publications

Experimental and computational investigation on the charge storage performance of a novel Al2O3-reduced graphene oxide hybrid electrode

Experimental and computational investigation on the charge storage performance of a novel Al2O3-reduced graphene oxide hybrid electrode

HF free greener Cl ‐terminated MXene as novel electrocatalyst for overall water splitting in alkaline media

Nanoarchitectonics of Nickel Nitride‐V2CTX Mxene: An Efficient Bifunctional Catalyst for Alkaline Water/Seawater Applications

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Nanoarchitectonics of Nickel Nitride‐V₂CT_X Mxene: An Efficient Bifunctional Catalyst for Alkaline Water/Seawater Applications