title: Constructing Multifunctional Metallic Ni Interface Layers in the g-C3N4Nanosheets/Amorphous NiS Heterojunctions for Efficient Photocatalytic H2Generation.
abstract: The construction of exceptionally robust and high-quality semiconductor-cocatalyst heterojunctions remains a grand challenge toward highly efficient and durable solar-to-fuel conversion. Herein, novel graphitic carbon nitride (g-C3N4) nanosheets decorated with multifunctional metallic Ni interface layers and amorphous NiS cocatalysts were fabricated via a facile three-step process: the loading of Ni(OH)2nanosheets, high-temperature H2reduction, and further deposition of amorphous NiS nanosheets. The results demonstrated that both robust metallic Ni interface layers and amorphous NiS can be utilized as electron cocatalysts to markedly boost the visible-light H2evolution over g-C3N4semiconductor. The optimized g-C3N4-based photocatalyst containing 0.5 wt % Ni and 1.0 wt % NiS presented the highest hydrogen evolution of 515 μmol g-1h-1, which was about 2.8 and 4.6 times as much as those obtained on binary g-C3N4-1.0%NiS and g-C3N4-0.5%Ni, respectively. Apparently, the metallic Ni interface layers play multifunctional roles in enhancing the visible-light H2evolution, which could first collect the photogenerated electrons from g-C3N4, and then accelerate the surface H2-evolution reaction kinetics over amorphous NiS cocatalysts. More interestingly, the synergetic effects of metallic Ni and amorphous NiS dual-layer electron cocatalysts could also improve the TEOA-oxidation capacity through upshifting the VB levels of g-C3N4. Comparatively speaking, the multifunctional metallic Ni layers are dominantly favorable for separating and transferring photoexcited charge carriers from g-C3N4to amorphous NiS cocatalysts owing to the formation of Schottky junctions, whereas the amorphous NiS nanosheets are mainly advantageous for decreasing the thermodynamic overpotentials for surface H2-evolution reactions. It is hoped that the implantation of multifunctional metallic interface layers can provide a versatile approach to enhance the photocatalytic H2generation over different semiconductor-cocatalyst heterojunctions.
authors.forename: Jiuqing
authors.initials: J
authors.lastname: Wen
authors.forename: Jun
authors.initials: J
authors.lastname: Xie
authors.forename: Hongdan
authors.initials: H
authors.lastname: Zhang
authors.forename: Aiping
authors.initials: A
authors.lastname: Zhang
authors.forename: Yingju
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Chemistry, University of Missouri - Kansas City , Kansas City, Missouri 64110, United States.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Chen
authors.forename: Xin
authors.identifier: http://orcid.org/0000-0002-4842-5054
authors.initials: X
authors.lastname: Li
keywords: H2-evolution kinetics; amorphous NiS; dual-layer electron cocatalysts; g-C3N4 nanosheets; metallic Ni interface layers; photocatalytic hydrogen evolution