Two-dimensional AlN/g-CNs van der Waals type-II heterojunction for water splitting

Abstract

Type-II van der Waals heterojunction photocatalyst is not only an ideal material for hydrogen production by water splitting, but also an important way to improve efficiency and produce low-cost clean...

A bicomponent synergistic MoxW1−xS2/aluminum nitride vdW heterojunction for enhanced photocatalytic hydrogen evolution: a first principles study

“…13 Previous studies have made photocatalytic hydrogen production a feasible solution. [14][15][16][17] The process of photocatalytic water splitting is roughly as follows: photocatalytic semiconductor absorbs photons to produce e À and h + , the photogenerated electrons transition to the conduction band, and a redox reaction occurs on the surface. [18][19][20][21] In theory, the more negative the conduction band potential is relative to the hydrogen electrode potential, the better the catalytic reduction ability of the material; the more positive the valence band potential is relative to the oxygen electrode potential, the better the oxidation performance of the material.…”

Strain-induced excellent photocatalytic performance in Z-scheme BlueP/γ-SnS heterostructures for water splitting

“…Two-dimensional (2D) van der Waals (vdW) heterojunctions have recently aroused considerable attention due to their diverse compositions, tunable band structures, and large interfacial contact areas, which make them promising candidates for constructing photocatalysts and nanodevices. [1][2][3] Among these layered heterojunctions, the semiconductor materials with type-II band alignment is more favorable than type-I heterostructure for light harvesting devices due to the effective separation of photogenerated electron-hole pairs. 4 Furthermore, Z-scheme heterojunction solves the problem that type-II heterojunction inevitably reduces the redox potential of photogenerated carriers, 5 and makes it possible to achieve solar-driven overall water splitting with a narrow band gap less than 1.23 eV, 6 which is necessary to break the theoretical STH efficiency (Z STH ) limit of 18%.…”

Tunable band alignment and optical properties in van der Waals heterostructures based on two-dimensional materials Janus-MoSSe and C3N4

“…For example, Xu et al acquired a type-II band alignment in the C 3 N 4 /AlN heterostructure and promoted the efficient separation of photo-generated holes and electron. Moreover, the strong electrostatic field formed at the heterostructure interface facilitates the transfer of photo-generated electrons from the AlN layer to the C 3 N 4 layer, enhancing device performance by facilitating electron injection [31].…”