Construct a novel CoAl-LDH/CdSe S scheme heterojunction with enhanced charge separation for efficient photocatalytic hydrogen evolution

Visible-Light-Driven Photocatalytic H2 Production Using Composites of Co–Al Layered Double Hydroxides and Graphene Derivatives

“…23 Due to its properties and exceptional redox activity, Co−Al LDH is an ideal candidate for photocatalytic hydrogen production. 21 Furthermore, the formation of composites based of Co−Al LDH and other compounds, such as GO, seems to decrease the electron−hole recombination rate and improve the electronic conductivity. 26 For these reasons, Co− Al LDH has been used in this work in combination with GO and GQD obtaining composites for H 2 production.…”

“…CdSe has a higher Fermi energy level than Co–Al LDH, so the electrons diffused from CdSe to LDH. The alignment of their Fermi energy levels favored the recombination of electrons in the CB of LDH with holes in the VB of CdSe, whereas protons were reduced to H 2 by electrons in the CB of CdSe . However, in the type II heterojunction synthesized by Guo et al, the electron transfer is from the CB of the semiconductor with a more negative potential (LDH) to the CB of the second semiconductor (CeO 2 ), where protons are reduced .…”

“…The alignment of their Fermi energy levels favored the recombination of electrons in the CB of LDH with holes in the VB of CdSe, whereas protons were reduced to H 2 by electrons in the CB of CdSe. 21 However, in the type II heterojunction synthesized by Guo et al, the electron transfer is from the CB of the semiconductor with a more negative potential (LDH) to the CB of the second semiconductor (CeO 2 ), where protons are reduced. 22 Sometimes, the addition of a PS is necessary to improve light absorption on heterostructures, as in the case of the S-scheme formed by Ni–Fe LDH and ZIF-67, where Eosin Y was added.…”