TY - JOUR
T1 - Experimental and theoretical study of MoSi2 and WSi2 electrodes for high-performance supercapacitors
AU - Abbas, Sayed Zafar
AU - Vikraman, Dhanasekaran
AU - Abbas, Zeesham
AU - Sheikh, Zulfqar Ali
AU - Mehdi, Syed Muhammad Zain
AU - Hussain, Iftikhar
AU - Batoo, Khalid Mujasam
AU - Kim, Hyun Seok
AU - Jung, Jongwan
AU - Hussain, Sajjad
AU - Lee, Naesung
N1 - Publisher Copyright:
© 2024 Elsevier Ltd
PY - 2025/1/30
Y1 - 2025/1/30
N2 - Transition metal silicides display a distinctive blend of metallic and ceramic characteristics, characterized by outstanding electrical conductivity, high-temperature durability, and exceptional cycling stability. To fully harness these properties, achieving an ultrafine structure, pure phase, and large specific surface area is crucial, enhancing their electrocatalytic performance. This study successfully synthesized WSi2 and MoSi2 particles through a one-step solid-state diffusion (SSD) process. The formation mechanisms of the MoSi2 and WSi2 particles were investigated by varying the temperature during the annealing process. The MoSi2 electrode demonstrated exceptional capacitance (404 F g−1 at 2 A g−1) and outstanding cycle stability (retaining 94 % of its initial performance after 5000 cycles). Additionally, the assembled asymmetric supercapacitor using MoSi2//AC prototype exhibited a high energy density of 46.6 Wh kg−1 at 4.8 kW kg−1 power density. Density functional theory estimation confirmed the metallic nature of XSi2 (X = W, Mo) and contributed to enhancing the density of states and energy level accumulation for efficient supercapacitors. The observed results attributed the active edges and porous nature promote the electrolyte diffusion during charge storage kinetics in the metal silicide electrodes.
AB - Transition metal silicides display a distinctive blend of metallic and ceramic characteristics, characterized by outstanding electrical conductivity, high-temperature durability, and exceptional cycling stability. To fully harness these properties, achieving an ultrafine structure, pure phase, and large specific surface area is crucial, enhancing their electrocatalytic performance. This study successfully synthesized WSi2 and MoSi2 particles through a one-step solid-state diffusion (SSD) process. The formation mechanisms of the MoSi2 and WSi2 particles were investigated by varying the temperature during the annealing process. The MoSi2 electrode demonstrated exceptional capacitance (404 F g−1 at 2 A g−1) and outstanding cycle stability (retaining 94 % of its initial performance after 5000 cycles). Additionally, the assembled asymmetric supercapacitor using MoSi2//AC prototype exhibited a high energy density of 46.6 Wh kg−1 at 4.8 kW kg−1 power density. Density functional theory estimation confirmed the metallic nature of XSi2 (X = W, Mo) and contributed to enhancing the density of states and energy level accumulation for efficient supercapacitors. The observed results attributed the active edges and porous nature promote the electrolyte diffusion during charge storage kinetics in the metal silicide electrodes.
KW - Asymmetric
KW - DFT
KW - MoSi
KW - Supercapacitors
KW - WSi
UR - http://www.scopus.com/inward/record.url?scp=85212319937&partnerID=8YFLogxK
U2 - 10.1016/j.est.2024.114978
DO - 10.1016/j.est.2024.114978
M3 - Article
AN - SCOPUS:85212319937
SN - 2352-152X
VL - 107
JO - Journal of Energy Storage
JF - Journal of Energy Storage
M1 - 114978
ER -