Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 239, Issue -, Pages 178-186Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2018.07.063
Keywords
Lanthanum titanate; NiFe-LDH; Reduced graphene oxide; Semiconductor photocatalyst; Dual co-catalysts; Water splitting
Funding
- National Research Foundation (NRF) of Korea - Korean Government [2017R1A2A1A05022387, 2011-0030255, 2012R1A3A2026417]
- National Research Foundation of Korea [2017R1A2A1A05022387, 2011-0030255, 2012R1A3A2026417] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Developing photocatalysts with effective charge separation and fast surface reaction kinetics is crucial to realizing efficient photocatalytic water splitting. In this study, we report a strongly coupled two-dimensionalternary-heterostructured photocatalyst by sequentially introducing reduced graphene oxide (rGO) and NiFe-layered double hydroxide (NiFe-LDH) on the surface of lanthanum titanate (LTO) via a facile hydrothermal and electrostatic self-assembly methodology, respectively. The synthesized 2D-rGO/LTO/NiFe-LDH photocatalyst showed remarkable photocatalytic H-2 evolution activity under simulated light irradiation, even without expensive Pt cocatalyst. The enhancement of photocatalytic activity could be attributed to the efficient interfacial charge transfer at the rGO/LTO heterojunction interface, and the enhanced hole (h(+)) trapping ability of NiFe-LDH cocatalyst at the LTO/NiFe-LDH interface, respectively. These attributes could effectively enlarge the life time of photo-generated electron-hole pairs, and increase the electron density for hydrogen production. The optimal rGO/LTO/NiFe-LDH nanocomposite remain sustained even after four successive experimental runs, without apparent change in the H-2 evolution rate. The present work elucidates a new strategy to maximize the efficiency via synergetic effect of incorporating rGO and NiFe-LDH as dual cocatalysts, and shows a feasible strategy of using earth-abundant materials as cocatalysts to enhance the overall photocatalytic water splitting reactions.
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