A rationally designed 3DTiO₂@CdZnS heterojunction photocatalyst for effectively enhanced visible-light-driven hydrogen evolution

Abstract

A 3DTiO2/CZS heterojunction photocatalyst with a very high hydrogen evolution rate of 75.38 mmol h−1 g−1 under visible light was prepared for the first time.

SrTiO3:Al/Cd0.6Zn0.4S Type-II Heterojunction Photocatalysts for Efficient Solar Water Splitting

“…55 The sulfur vacancies and twin heterojunctions of Cd x Zn 1−x S facilitate separation of photogenerated carriers and adsorption of S 2− , exhibiting good photocatalytic activity. 17 It has been reported that Cd x Zn 1−x S with x between 0.4 and 0.6 shows the best photocatalytic hydrogen production activity. 6 Although pure Cd x Zn 1−x S already has good photocatalytic activity, it still has the problem of short photocarrier lifetime and poor stability.…”

“…Cd x Zn 1– x S is a promising n-type semiconductor material with the advantages of adjustable band gap and edge position, simple synthesis process, and strong light absorption ability . The sulfur vacancies and twin heterojunctions of Cd x Zn 1– x S facilitate separation of photogenerated carriers and adsorption of S 2– , exhibiting good photocatalytic activity . It has been reported that Cd x Zn 1– x S with x between 0.4 and 0.6 shows the best photocatalytic hydrogen production activity .…”

“…Semiconductors play a vital role in the efficient solar water splitting. , Currently, the semiconductors applied in photocatalytic water splitting for hydrogen production mainly include transition metal oxides, − perovskite-structured materials, − sulfides, − and polymeric carbon nitride . Among them, ABX 3 perovskite materials are highly regarded by researchers for their structural stability and easy replacement of (AB) metal elements.…”

“…However, improvement in the photocatalytic hydrogen production performance of Cd x Zn 1– x S by hole sacrificial agents has its limits. It has been proven that constructing heterojunctions is one of the effective methods to increase the lifetime of photogenerated carriers in Cd x Zn 1– x S. ,− Among them, constructing type-II heterojunctions to form internal electric fields is considered one of the most potential ways to enhance the separation and transport of electron–hole pairs in photocatalysts. , Therefore, preparing SrTiO 3 /Cd x Zn 1– x S photocatalysts with type-II heterojunctions has important guiding significance for exploring the relationship between heterojunctions and photocatalytic hydrogen production performance.…”