Since their discovery, MXenes have conferred various intriguing features because of their distinctive structures. Focus has been placed on using MXenes in electrochemical energy storage including a supercapacitor showing significant and promising development. However, like other 2D materials, MXene layers unavoidably experience stacking agglomeration because of its great van der Waals forces, which causes a significant loss of electrochemically active sites. With the help of MoS₂, a better MXene-based electrodecan is planned to fabricate supercapacitors with the remarkable electrochemical performance. The synthesis of MXene/MoS₂ and the ground effects of supercapacitors are currently being analysed by many researchers internationally. The performance of commercial supercapacitors might be improved via electrode architecture. This analysis will support the design of MXene and MoS₂ hybrid electrodes for highly effective supercapacitors. Improved electrode capacitance, voltage window and energy density are discussed in this literature study. With a focus on the most recent electrochemical performance of both MXene and MoS₂-based electrodes and devices, this review summarises recent developments in materials synthesis and its characterisation. It also helps to identify the difficulties and fresh possibilities MXenes MoS₂ and its hybrid heterostructure in this developing field of energy storage. Future choices for constructing supercapacitors will benefit from this review. This review examines the newest developments in MXene/MoS₂ supercapacitors, primarily focusing on compiling literature from 2017 through 2022. This review also presents an overview of the design (structures), recent developments, and challenges of the emerging electrode materials, with thoughts on how well such materials function electrochemically in supercapacitors.

The electrochemical properties of <mml:math display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ti</mml:mtext></mml:mrow><mml:mrow><mml:mn>45</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Zr</mml:mtext></mml:mrow><mml:mrow><mml:mn>38</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Ni</mml:mtext></mml:mrow><mml:mrow><mml:mn>17</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Ti45Zr38Ni17 amorphous and icosahedral (i) quasi-crystal electrodes synthesized by mechanical alloying and subsequent annealing were measured in a three-electrode cell at temperatures of 298 and 328 K. During electrochemical hydrogenation, the maximum H/M (number of hydrogen atoms per metal atom) value for the i-phase electrode reached 1.4, which corresponds to a theoretical capacity of 570 mAh/g. The discharge capacities for both the amorphous and i-phase electrodes at 298 K increased with increasing charge/discharge cycles at the initial stage because of an activation process. The maximum discharge capacity for i-phase and amorphous electrodes at 298 K were 23.9 and 5.9 mAh/g, respectively, at a current density of 15 mA/g. The maximum discharge capacity for the i-phase electrode, however, reached about 88 mAh/g after the first cycle at 328 K and then decreased as the number of cycles increased. The structure of the i phase was stable even after the discharge process of the 25th cycle, but the amorphous electrode converted to <mml:math display="inline"><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mtext>Ti</mml:mtext><mml:mo>,</mml:mo><mml:mtext>Zr</mml:mtext></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:msub><mml:mi mathvariant="normal">H</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>(Ti,Zr)H2 face-centered-cubic-type hydride, which substantially lowered its total discharge performance.

Metal hydrides of AB5 compositions have been investigated over the years as they offer extraordinary volumetric hydrogen densities with high cycling stability and purity of released hydrogen. Moreover, by doping with different elements, the sorption properties of alloys can be significantly changed according to their foreseen applications. In this contribution, we report the synthesis routes and hydrogenation characteristics of La_1−xY_xNi_4.5Cu_0.5. The synthesized alloys exhibit excellent structural purity with all reflections indexed by the hexagonal P6/mmm structure. It was found that the Y content can easily tune (raise) the equilibrium pressures of the pressure–composition isotherms, while overall gravimetric density remains at a level exceeding 1.5 wt.% up to x = 0.3 then strongly decreases. The pressure range for desorption can be tuned from 1.5 to 5 bars at room temperature. Some alloys (x = 0; 0.2) exhibit very good stability during 1000 cycles of hydrogen loading and unloading. Furthermore, activation of the alloys is prompt, making them good candidates for stationary hydrogen storage, non-mechanical hydrogen compressors, or soft actuators.