Spatial charge separation on strongly coupled 2D-hybrid of rGO/La2Ti2O7/NiFe-LDH heterostructures for highly efficient noble metal free photocatalytic hydrogen generation

被引:122
作者
Boppella, Ramireddy [1 ,2 ]
Choi, Chi Hun [1 ]
Moon, Jooho [2 ]
Kim, Dong Ha [1 ]
机构
[1] Ewha Womans Univ, Dept Chem & Nano Sci, 52 Ewhayeodae Gil, Seoul 03760, South Korea
[2] Yonsei Univ, Dept Mat Sci & Engn, 50 Yonsei Ro, Seoul 03722, South Korea
基金
新加坡国家研究基金会;
关键词
Lanthanum titanate; NiFe-LDH; Reduced graphene oxide; Semiconductor photocatalyst; Dual co-catalysts; Water splitting; LAYERED DOUBLE HYDROXIDES; NANOWIRE ARRAYS; COMPOSITE PHOTOCATALYST; H-2-PRODUCTION ACTIVITY; ENHANCED PHOTOACTIVITY; WATER; GRAPHENE; SEMICONDUCTOR; COCATALYSTS; EVOLUTION;
D O I
10.1016/j.apcatb.2018.07.063
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:178 / 186
页数:9
相关论文
共 67 条
[1]   Cobalt phosphate modified TiO2 nanowire arrays as co-catalysts for solar water splitting [J].
Ai, Guanjie ;
Mo, Rong ;
Li, Hongxing ;
Zhong, Jianxin .
NANOSCALE, 2015, 7 (15) :6722-6728
[2]   Evolution of layered double hydroxides (LDH) as high performance water oxidation electrocatalysts: A review with insights on structure, activity and mechanism [J].
Anantharaj, Sengeni ;
Karthick, Kannimuthu ;
Kundu, Subrata .
MATERIALS TODAY ENERGY, 2017, 6 :1-26
[3]   Synthesis of novel 2D-2D p-n heterojunction BiOBr/La2Ti2O7 composite photocatalyst with enhanced photocatalytic performance under both UV and visible light irradiation [J].
Ao, Yanhui ;
Wang, Kedan ;
Wang, Peifang ;
Wang, Chao ;
Hou, Jun .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2016, 194 :157-168
[4]   Composite hollow nanostructures composed of carbon-coated Ti3+ self-doped TiO2-reduced graphene oxide as an efficient electrocatalyst for oxygen reduction [J].
Boppella, Ramireddy ;
Lee, Ji-Eun ;
Mota, Filipe Marques ;
Kim, Jin Young ;
Feng, Zhenxing ;
Kim, Dong Ha .
JOURNAL OF MATERIALS CHEMISTRY A, 2017, 5 (15) :7072-7080
[5]   Plasmon-Sensitized Graphene/TiO2 Inverse Opal Nanostructures with Enhanced Charge Collection Efficiency for Water Splitting [J].
Boppella, Ramireddy ;
Kochuveedu, Saji Thomas ;
Kim, Heejun ;
Jeong, Myung Jin ;
Mota, Filipe Marques ;
Park, Jong Hyeok ;
Kim, Dong Ha .
ACS APPLIED MATERIALS & INTERFACES, 2017, 9 (08) :7075-7083
[6]   Hierarchical rutile TiO2 aggregates: A high photonic strength material for optical and optoelectronic devices [J].
Boppella, Ramireddy ;
Mohammadpour, Arash ;
Illa, Sivaram ;
Farsinezhad, Samira ;
Basak, Pratyay ;
Shankar, Karthik ;
Manorama, Sunkara V. .
ACTA MATERIALIA, 2016, 119 :92-103
[7]   Facile Synthesis of Face Oriented ZnO Crystals: Tunable Polar Facets and Shape Induced Enhanced Photocatalytic Performance [J].
Boppella, Ramireddy ;
Anjaneyulu, K. ;
Basak, Pratyay ;
Manorama, Sunkara V. .
JOURNAL OF PHYSICAL CHEMISTRY C, 2013, 117 (09) :4597-4605
[8]   Viable Method for the Synthesis of Biphasic TiO2 Nanocrystals with Tunable Phase Composition and Enabled Visible-Light Photocatalytic Performance [J].
Boppella, Ramireddy ;
Basak, Pratyay ;
Manorama, Sunkara V. .
ACS APPLIED MATERIALS & INTERFACES, 2012, 4 (03) :1239-1246
[9]   PREDICTION OF FLATBAND POTENTIALS AT SEMICONDUCTOR-ELECTROLYTE INTERFACES FROM ATOMIC ELECTRONEGATIVITIES [J].
BUTLER, MA ;
GINLEY, DS .
JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 1978, 125 (02) :228-232
[10]   Charge separation in a nanostep structured perovskite-type photocatalyst induced by successive surface heterojunctions [J].
Cai, Xiaoyan ;
Mao, Liang ;
Zhang, Junying ;
Zhu, Mingshan ;
Fujitsuka, Mamoru ;
Majima, Tetsuro .
JOURNAL OF MATERIALS CHEMISTRY A, 2017, 5 (21) :10442-10449