Amorphous cobalt boride nanoparticles incorporated vanadium carbide MXene composite for asymmetric supercapacitor applications

Abstract

Summary The use of novel, low‐cost, and efficient electrode materials in high‐power energy technology is highly anticipated for the development of user‐friendly products. Recently, “MXenes” have been identified as a novel class of advanced two‐dimensional (2D) layered transition metal compounds that have piqued the interest of researchers in a variety of electrochemical applications due to their remarkable physicochemical properties that resemble other 2D materials such as graphene. Similarly, an amorphous transition metal boride compound has sparked considerable interest as a potential candidate for battery‐type supercapacitor electrodes. However, the concerns about MXene layer restacking and the low electrical conductivity of metal borides limit their usefulness. Herein, we present the fabrication of a novel metal boride‐MXene (CoB‐V‐MX) architecture using a simple one‐pot chemical reduction process of cobalt boride nanoparticles and V‐MXene flakes. An asymmetric hybrid supercapacitor (HSC) with activated carbon as the anode and the prepared composite as the cathode was developed. The HSC device can operate over a wider voltage range (1.6 V), distribute a high specific energy of 31.5 Wh kg−1 at a power density of 800 W kg−1, and retain up to 89.2% of its initial capacitance for up to 2500 charge‐discharge cycles, demonstrating the increased possibility of designing a novel composite architecture in advanced energy storage applications.

Unveiling the Latest Advancements in Vanadium Carbide MXene based Supercapacitors and their Future Trends

“…The assembled composite HSC showed a power density of 800 W/kg and energy density of 31.5 Wh/kg and was still capable of maintaining a specific energy of 14.4 Wh/kg @ 4 kW/kg. In addition, the device demonstrated exceptional cyclic stability with a retention of 89.2 % after 2500 charge‐discharge cycles [88] …”

“…In addition, the device demonstrated exceptional cyclic stability with a retention of 89.2 % after 2500 charge-discharge cycles. [88] The binder-free films made from MXene hetero-layers exhibit better performance and surprising electrochemical characteristics with higher volumetric capacitance. Vahid Mohammadi et al have demonstrated negatively charged, self- EIS plots (e) cyclic performance @ 10 A g À 1 and inset super-capacitor schematic.…”

“…Internal mechanism of supercapacitor electrode fabricated for (a) CoB, (b) Initial composite structure development, and (c) the optimum configuration obtained for CoB-V-Max composite. [88] assembled MXene nano-sheets using a liquid phase assembly. The two MXene compositions were arranged in an alternating pattern along the cross-section of the film.…”

“… Internal mechanism of supercapacitor electrode fabricated for (a) CoB, (b) Initial composite structure development, and (c) the optimum configuration obtained for CoB‐V‐Max composite [88] …”

Review and Perspectives of Electrochemical Energy Conversion and Storage in Metal Diborides and XBenes

“…AlB 2 -type metal borides are primarily ionic layered materials, where adjacent layers are held together by ionic bonding. , This structure gives rise to a number of interesting properties, including ultrahigh strength, good electrical and thermal conductivity, wear resistance, chemical inertness, and high melting point. , MgB 2 , the flagship member of the metal diboride family, is known for its superconductivity, TiB 2 is known for its use in ballistic armors, and AlB 2 has been used as a reinforcing material. ,− However, they are recently being revisited in multiple new domains due to their excellent electrochemical properties. One of the earliest reports highlighted the investigation of various metal diborides such as AlB 2 , CrB 2 , HfB 2 , MgB 2 , NbB 2 , TaB 2 , TiB 2 , VB 2 , and ZrB 2 as potential catalysts for HER, VB 2 and WB 2 for batteries, and MgB 2 for water splitting and lithium-ion batteries. ,,− Research trends in the synthesis of metal diborides encompass various methods including the solid-state reaction method, sol–gel synthesis, mechanical alloying, and self-propagating high-temperature synthesis (SHS). These techniques allow for precise control over material properties, microstructure, and phase composition, offering tailored metal diborides for specific applications.…”