Organic-inorganic hybrid-photoanode built from NiFe-MOF and TiO2 for efficient PEC water splitting

被引:86
作者
Cui, Weicheng [1 ]
Bai, Hongye [1 ]
Shang, Jianpeng [2 ]
Wang, Fagen [1 ]
Xu, Dongbo [1 ]
Ding, Jinrui [1 ]
Fan, Weiqiang [1 ]
Shi, Weidong [1 ]
机构
[1] Jiangsu Univ, Sch Chem & Chem Engn, Zhenjiang 212013, Jiangsu, Peoples R China
[2] Shanxi Datong Univ, Dept Chem & Environm Engn, Datong 037009, Peoples R China
基金
中国国家自然科学基金;
关键词
NiFe-MOF; Unsaturated metal sites; Hybrid-photoanode; Water splitting; VISIBLE-LIGHT-DRIVEN; OXYGEN EVOLUTION; OXIDATION EFFICIENCY; LOW-COST; METAL; FRAMEWORKS; PERFORMANCE; ELECTROCATALYSTS; HETEROSTRUCTURE; NANOARRAYS;
D O I
10.1016/j.electacta.2020.136383
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Constructing the high-performance photoanode is critical to improve photoelectrochemical (PEC) efficiency, but it is still an inevitable challenge to rationally fabricate the organic-inorganic hybrid-photoanode system. For the first time, we report a novel hybrid-photoanode built from ultrathin NiFe-MOF and TiO2 by a sacrifice template method. The in-situ etch of NiFe-layered double hydroxide (LDH) on the surface of TiO2 has been successfully realized in the coordination environment, for creating coordinately unsaturated metal sites on NiFe-MOF. The coordinately unsaturated metal sites could significantly promote the water oxidation kinetic, compared with conventional electrode/electrolyte interface. The photocurrent density of the NiFe-MOF/TiO2 has reached about 3.35 times of bare TiO2 at 1.23 V (vs. RHE), and the incident photon to current conversion efficiency (IPCE) value has been improved up to 42% (at 390 nm). The significant augment of the charge injection (eta(injection)) of 92.8% and charge separation (eta(separation)) efficiency of 37.4% has also been exhibited. Moreover, NiFe-MOF/TiO2 shows a long-term stability (< 10% decay) after 4 h of continuous illumination. This work provided a novel and rational strategy about the integration of the inorganic semiconductor and organic MOF, which can provide a new insight into understanding MOF-based catalysts for PEC water splitting. (c) 2020 Elsevier Ltd. All rights reserved.
引用
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页数:11
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