4 years ago

N-Doped Mesoporous In2O3 for Photocatalytic Oxygen Evolution from the In-based Metal–Organic Frameworks

N-Doped Mesoporous In2O3 for Photocatalytic Oxygen Evolution from the In-based Metal–Organic Frameworks
Xiaoyu Gan, Ruijin Zheng, Jiao Meng, Xuan Sun, Xun Sun, Ruiping Chen, Tianlin Liu
As an excellent n-type semiconductor, indium oxide (In2O3) is also a good candidate for photocatalysis such as light-induced water splitting. However, the efficiency of the oxygen evolution reaction (OER) underperforms in view of the wide band gap (BG) and fast charge recombination in In2O3. N-doping provides a sound method to narrow the BG and to prohibit the charge recombination by forming new energy levels between the valence band (VB) and the conduction band (CB). In this work, an In-based organic framework sod-ZMOF was used as a precursor to prepare the N-doped In2O3. After calcination, sod-ZMOF is transformed into N-doped In2O3 nanocrystalline, in which the ligand within sod-ZMOF serves as the nitrogen source. In addition, sod-ZMOF acts as self-template during calcination to generate abundant nanopores within the In2O3 frameworks, providing large specific surface area and active sites for OER. The BG is narrowed to 2.9 from 3.7 eV of the pure In2O3 on account of the N-doping. N species are doped in both the substitutional and interstitial fashion, and the interstitial doping is believed to improve the photo-induced carrier separation by the formation of oxygen vacancies. As a consequence, the overpotential for OER is effectively decreased from the pure In2O3, and the electrocatalytic experiment proves superior catalytic activity with a high current density and long-term durability compared to the In2O3 nanoparticles obtained from In(OH)3. Superior photocatalytic OER performance: a facile and effective method to construct an N-doped structure from the corresponding metal–organic framework (MOF) precursor, which provides superior photocatalytic oxygen evolution reaction (OER) performance with large specific surface area and multilevel porosity, narrowed energy band, as well as stabilized photoinduced charge separation.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201605576

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