MXene Nanosheets Induce Efficient Iron Selenide Active Sites to Boost the Electrocatalytic Hydrogen Evolution Reaction

Abstract

Along with the widespread utilization of hydrogen energy, the rise of highly active hydrogen evolution electrocatalysts with affordable costs presently becomes a substantial crux of this emerging domain. In this work, we demonstrate a feasible and convenient in situ seed-induced growth strategy for the construction of small-sized FeSe2 nanoparticles decorated on two-dimensional (2D) superthin Ti3C2T x MXene sheets (FeSe2/Ti3C2T x ) through a manipulated bottom-up synthetic procedure. By virtue of the distinctive 0D/2D heterostructures, abundant exposed surface area, well-distributed FeSe2 catalytic centers, strong surface electronic coupling, and high electrical conductivity, the resultant FeSe2/Ti3C2T x nanoarchitectures are endowed with a superior electrocatalytic hydrogen evolution capacity including a competitive onset potential of 89 mV, a favorable Tafel slope of 78 mV dec–1, and a long-period stability, significantly better than that of the pristine FeSe2 and Ti3C2T x catalysts.

Electron Regulation of Heterostructured Pt/Rh Metallene Boosts Ethylene Glycol Electrooxidation and Hydrogen Evolution

“…In addition, the engineering of nanoparticles on a 2D structure is also an attractive strategy. Nanoparticle (NP)-deposited 2D nanomaterials can amplify the interface effect and improve atomic utilization. − More importantly, strong electron interaction at the heterostructure interface can promote the redistribution of electron charge density, adjust the adsorption of intermediates, and reduce the reaction energy barrier. − Therefore, the development of Pt/Rh heterostructured metallene is expected to be promising for H 2 production and the selective oxidation of ethylene glycol.…”

In Situ Fabrication of a 2D/2D MXene/CN Heterojunction for Photothermally Assisted Photocatalytic Sterilization under Visible Light Irradiation

“…Simultaneously, a higher carrier concentration may also generate more heat through crystal lattice vibrations. − In addition, a certain degree of heat can cause irreversible degenerate death of bacterial proteins . Considering the factors mentioned above, 2D Ti 3 C 2 T x MXene materials, as a typical MXene material in the field of photocatalysis, have been widely studied due to good electrical conductivity and excellent light absorption and conversion capabilities, serving as a potentially effective candidate for improving the performance of CN light-driven sterilization. − The 2D CN coupled with the 2D MXene could not only strengthen light utilization or photogenic carrier separation and migration but did furnish more active sites for the production of reactive oxygen species (ROS). More interestingly, implanting MXene characterized by the plasmonic effect can also expedite the activity of photogenerated carriers for the creation of ROS. , It is expected that the sterilization efficiency can be greatly improved by constructing a photothermally assisted photocatalytic system using visible light-responsive CN-embedded MXene with a plasmonic effect.…”