MXene Hybrid Nanosheet of WS<sub>2</sub>/Ti<sub>3</sub>C<sub>2</sub> for Electrocatalytic Hydrogen Evolution Reaction
Mahider Tekalgne, Ha Huu, Tuan Van Nguyen, Quyet Van Le, Sung Hyun Hong, Sang Hyun Ahn, Soo Young Kim
Abstract
High Resolution Image Download MS PowerPoint Slide Designing low-cost hybrid electrocatalysts for hydrogen production is of significant importance. Recently, MXene-based materials are being increasingly employed in energy storage devices owing to their layered structure and high electrical conductivity. In this study, we propose a facile hydrothermal strategy for producing WS 2 /Ti 3 C 2 nanosheets that function as electrocatalysts in the hydrogen evolution reaction (HER). WS 2 provides a high surface area and active sites for electrocatalytic activity, whereas MXene Ti 3 C 2 facilitates charge transfer. As a result, the synthesized WS 2 /Ti 3 C 2 offers an increased surface area and exhibits an enhanced electrocatalytic activity in acidic media. The WS 2 /Ti 3 C 2 (10%) catalyst exhibited a low onset potential of −150 mV versus RHE for the HER and a low Tafel slope of ∼62 mV dec –1 . Moreover, WS 2 /Ti 3 C 2 (10%) exhibited a double-layer capacitance of 1.2 mF/cm –2, which is 3 and 6 times greater than those of bare WS 2 and Ti 3 C 2, respectively. This catalyst also maintained a steady catalytic activity for the HER for over 1000 cycles.