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The ZnIn 2 S 4 /CdS hollow core-shell nanoheterostructure with bimetallic synergism is synthesized via a hybrid chemical method. As revealed, the ZnIn 2 S 4 /CdS hollow core-shell nanoheterostructure (ZnIn 2 S 4 /CdS-3) exhibits remarkable visible light photocatalytic hydrogen evolution (∼5209.43 μmol·g−1·h−1, AQE of ∼20.26%) than that of single CdS (∼40 folds) and single ZnIn 2 S 4 (∼12 folds), and achieves decent photocatalytic stability (average HER performance of ∼5056.80 μmol·g−1·h−1), which is mainly ascribed to that, the formed ZnIn 2 S 4 /CdS heterostructure with appropriate potential gradient and Zn/In bimetallic synergism can improve carrier transportation, including increasing carrier transportation, prolonging lifetime and decreasing recombination, the hollow core-shell nanostructure can provide abundant active sites and increase solar efficiency, while can maintain a photocatalytic stability. [Display omitted] • Heterostructure can promote carriers separation/transport via appropriate potential. • Zn/In bimetallic sulfides synergy can improve charge carriers efficiency. • Hollow core-shell structure can increase active site and solar efficiency. [ABSTRACT FROM AUTHOR]

[Display omitted] • HER/OER synergism of Ni2+/O v is the core issue for overall water splitting. • Ni2+ ions with high solar efficiency and rapidly electron diffusion can promote HER. • O v can decrease OER energy barrier and promote holes transportation for OER. • Heterojunction with appropriate potential gradient can improve carrier efficiency. • Hollow core–shell structure can increase active sites and solar efficiency. The synergetic HER/OER (hydrogen evolution reaction/oxygen evolution reaction) is the crucial issue for overall water splitting. Herein, the Ni2+-LaNiO 3 /CdS hollow core–shell heterojunction with HER/OER synergism of Ni2+/O v (oxygen vacancy) is synthesized by a hybrid hydrothermal-reductive-chemical method. As shown, the Ni2+-LaNiO 3 /CdS (∼15480.79 μmol∙g−1∙h−1) exhibits an obvious visible light photocatalytic enhancement (HER/Photodegradation) than that of single LaNiO 3 (∼200/∼15 folds) and single CdS (∼120/∼6 folds), and achieves a better overall water splitting performance of ∼ 645.23(H 2)/321.62(O 2) μmol∙g−1∙h−1 (∼110 folds of LaNiO 3), and a respectable stability (∼5.64% decreasing during 24 h). It mainly ascribes to the synergetic HER/OER via the Ni2+/O v , formed heterojunction and hollow core–shell structure. There, the Ni2+ ions can increase solar efficiency and promote photo-generated electron diffusing for HER, the O v induced by Ni2+ can decrease OER energy barrier and promote hole-related species transportation for OER, the LaNiO 3 /CdS heterojunction with appropriate potential gradient can improve carrier efficiency, and the hollow core–shell structure can increase active sites and solar efficiency. Furthermore, the quickly carrier diffusion can inhibit photocorrosion and hollow spherical structure can increase photocatalytic stability. [ABSTRACT FROM AUTHOR]

S-scheme core-shell nanorods heterojunction of Er:WO 3 /CdS/g-C 3 N 4 QDs is fabricated via hydrothermal-chemical-annealing method. Er:WO 3 /CdS/g-C 3 N 4 QDs S-scheme heterojunction exhibits prominent enhanced photocatalytic HER (∼1912.12 μmol g−1 h−1) and degradation than WO 3 (no HER/∼5.0 folds), CdS (∼20 folds/∼3.5 folds) and g-C 3 N 4 QDs (∼62 folds/∼4.0 folds). There, the Er:WO 3 /CdS S-scheme heterojunction with carrier quenching and greater potential gradient can improve carrier separation, the CdS with higher absorption and Er:WO 3 with near-infrared up-conversion fluorescence can increase solar efficiency, the g-C 3 N 4 QDs with high quantum yield can increase carrier injection, all these can optimize the carrier efficiency, including transportation increasing, lifetime prolonging, recombination decreasing, and can be supported by the DFT. In addition, the CdS nanoparticles shell and g-C 3 N 4 QDs can provide vast active sites, the core-shell nanorods structure can provide carrier pathway to inhibit photocorrosion, while maintaining good stability. [Display omitted] • S-scheme heterojunction with carrier quenching can improve carrier separation. • Near-infrared upconversion fluorescence of Er:WO 3 can increase solar efficiency. • g-C 3 N 4 QDs with high QY can increase carrier injection. • CdS nanoparticles shell and g-C 3 N 4 QDs can provide vast active sites. • Core-shell nanorods structure can inhibit photocorrosion and maintain stability. [ABSTRACT FROM AUTHOR]

The Cd 0.8 Zn 0.2 S/In 2 S 3 porous nanotubes heterojunction is fabricated via chemical-hydrothermal method. Cd 0.8 Zn 0.2 S/In 2 S 3 heterojunction (Cd 0.8 Zn 0.2 S/In 2 S 3 -3) exhibits a prominent enhanced photocatalytic HER activity (∼3480.91 μmol g−1 h−1, AQE of ∼12.09%) and photodegradation than single In 2 S 3 (∼40 folds/∼10 folds) and single Cd 0.8 Zn 0.2 S (∼30 folds/∼4 folds). There, the Cd 0.8 Zn 0.2 S/In 2 S 3 heterojunction with great potential gradient, bimetallic synergism, crystal lattice matching and visible light response can ameliorate carrier efficiency effectively, including transportation increasing, lifetime prolonging, recombination decreasing, and can be supported by the DFT. In addition, formed porous nanotubes microstructural can increase photocatalytic active sites and light reflections, and shorten carrier pathway, meanwhile maintaining a good stability. Herein, the modification of heterojunction, bimetallic synergy and hollow tubular structure can provide new sights for preparing green energy-environmental materials. [Display omitted] [ABSTRACT FROM AUTHOR]

The transparent Cu 2 O film/Zn 3 In 2 S 6 QDs/TiO 2 orderly nanoarrays pn junction has been prepared via a continuous hydrothermal-co-precipitation-sputtering method. As revealed, the as-prepared Cu 2 O/Zn 3 In 2 S 6 QDs/TiO 2 transparent pn junction (Cu 2 O/ZIS-3-TiO 2) exhibits highly transmittance of ∼85%, obvious photovoltaic conversion enhancement of ∼1.2 × 103 folds (IPCE of 1.17%) than intrinsic Cu 2 O/TiO 2 pn junction, and decent stability during 40000s′ continuous cycle, which can be mainly ascribed to that, the Zn 3 In 2 S 6 QDs with appropriate Fermi level, high quantum yields and wide band gap, can optimize the photo-generated carrier concentration-mobility kinetic equilibrium efficiently, while maintaining a high transparency. Additionally, TiO 2 orderly nanoarrays can provide carrier transportation pathway, increase solar efficiency and physical stability. [Display omitted] • High QY of Zn 3 In 2 S 6 QD can increase carrier injection to increase concentration. • Regulated potential of Zn 3 In 2 S 6 QD can act as transition layer to increase mobility. • Zn 3 In 2 S 6 QD can balance the transmittance and photovoltaic conversion. • TiO 2 orderly nanoarrays can increase stability and solar efficiency. [ABSTRACT FROM AUTHOR]

The g-C 3 N 4 /Er:CdSe/SiO 2 ternary core-shell heterojunction with up-conversion fluorescence auxiliary is fabricated via a simple chemical-calcination method. As revealed, the g-C 3 N 4 /Er:CdSe/SiO 2 ternary core-shell heterojunction (g-C 3 N 4 /Er:CdSe/SiO 2 -3) exhibits remarkable visible light photocatalytic hydrogen evolution and photodegradation tetracycline hydrochloride enhancement than that of single CdSe (∼35 folds of HER, ∼2 folds of photodegradation) and single g-C 3 N 4 (∼70 folds of HER, ∼2 folds of photodegradation), and achieves decent photocatalytic stability. It can be mainly attributed to that, the SiO 2 spheres act as optical lens and Er-doping with up-conversion fluorescence can increase solar efficiency, and the formed g-C 3 N 4 /Er:CdSe heterojunction with appropriate potential gradient can improve carrier efficiency, including increasing transportation, prolonging lifetime and decreasing recombination. What's more, the ternary core-shell spheroidal structure can increase active sites and photocatalytic stability. [Display omitted] • Er-doping with unique up-conversion fluorescence can increase solar efficiency. • Heterojunction can promote carriers separation/transport via appropriate potential. • SiO 2 spheres act as optical lens can increase solar efficiency. [ABSTRACT FROM AUTHOR]