期刊
ACS CATALYSIS
卷 9, 期 2, 页码 1289-1297出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.8b04034
关键词
hybrid microwave annealing Fe2O3@FeNbO4 nanorods; heterojunction; codoping; cocatalysts; photoelectrochemical water splitting
资金
- Climate Change Response project - MSIT [2015M1A2A2074663, 2015M1A2A2056824]
- Basic Science Grant - MSIT [NRF-2018R1A2A1A05077909]
- Korea Centre for Artificial Photosynthesis (KCAP) - MSIT [2009-0093880]
- Next Generation Carbon Upcycling Project - MSIT [2017M1A2A2043138]
- Korea-China Key Joint Research Program - MSIT [2017K2A9A2A11070341]
- MOTIE of Republic of Korea [10050509, KIAT N0001754]
Orthorhombic iron niobate (FeNbO4) has a band structure to form an effective heterojunction with hematite to make an efficient photoanode for photoelectrochemical water splitting. However, this high temperature phase is difficult to synthesize by conventional thermal annealing (CTA) without damaging F:SnO2 (FTO) substrate. In contrast, hybrid microwave annealing (HMA) selectively forms a few atomic overlayers of highly crystalline orthorhombic FeNbO4 phase covering hematite nanorods in an extremely short time (2 min) without any FTO damage forming a core shell-type Fe2O3@FeNbO4 nanorod heterojunction on FTO. At the same time, hematite is codoped naturally with Nb and Sn during the HMA synthesis by diffusion from FeNbO4 and FTO, respectively. The optimized Nb,Sn:Fe(2)O(3)2FeNbO(4)/FTO electrode loaded with NiFeOx cocatalyst achieves a stable photocurrent density of 2.71 mA cm(-2) at 1.23 V-RHE under simulated sunlight (100 mW cm(-2)) with similar to 100% faradaic efficiency of hydrogen production, which is similar to 3.4 times higher than that of bare hematite prepared by CTA (0.8 mA cm(-2)).
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