Binder-free heterostructured MWCNTs/Al2S3 decorated on NiCo foam as highly reversible cathode material for high-performance supercapacitors

Baig, Mutawara Mahmood; Gul, Iftikhar Hussain; Khan, Muhammad Zarrar; Mehran, Muhammad Taqi; Akhtar, Muhammad Saleem

doi:10.1016/j.electacta.2020.135955

Cited by 40 publications

(12 citation statements)

References 78 publications

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“…Whereas, at the internal surface, the quantity of charges is a "diffusion-controlled" mechanism. Therefore, the overall volumetric charges are dependent on scan rates as per the equation mentioned in our previous report (Baig et al, 2020). Figure 5 showed the plot between scan rates and the quantity of charges stored on the surface.…”

Section: Electrochemical Measurementsmentioning

confidence: 88%

“…The bode plot of MoS 2 and MoS 2 /rGO is presented in Figure 7B. The impedance features of the supercapacitor fall among ideal resistors (phase angle 0°) and ideal capacitors (phase angle 90°) (Azad et al, 2020;Baig et al, 2020). The phase angle for MoS 2 /rGO and MoS 2 was 79.8°and 65.6°, representing the outstanding pseudocapacitance performance of active materials.…”

Section: Electrochemical Measurementsmentioning

confidence: 99%

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High-Performance Supercapacitor Electrode Obtained by Directly Bonding 2D Materials: Hierarchal MoS2 on Reduced Graphene Oxide

2020

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Section: Electrochemical Measurementsmentioning

confidence: 88%

Section: Electrochemical Measurementsmentioning

confidence: 99%

High-Performance Supercapacitor Electrode Obtained by Directly Bonding 2D Materials: Hierarchal MoS2 on Reduced Graphene Oxide

2020

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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%

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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“…The porous Ni foam provides the smaller pathways for the movement of ions. 58,59 The MWCNT forms a uniform conductive network that facilitates the ion diffusion and provide large surface area that results in the high catalytic activity. The durability is the key for the industrial scale considerations.…”

Section: Her Activitymentioning

confidence: 99%

MWCNT-modified MXene as cost-effective efficient bifunctional catalyst for overall water splitting

Zahra

Rizwan

2022

RSC Adv.

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Binder-free heterostructured MWCNTs/Al2S3 decorated on NiCo foam as highly reversible cathode material for high-performance supercapacitors

Cited by 40 publications

References 78 publications

High-Performance Supercapacitor Electrode Obtained by Directly Bonding 2D Materials: Hierarchal MoS2 on Reduced Graphene Oxide

High-Performance Supercapacitor Electrode Obtained by Directly Bonding 2D Materials: Hierarchal MoS2 on Reduced Graphene Oxide

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

MWCNT-modified MXene as cost-effective efficient bifunctional catalyst for overall water splitting

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