title: N-Doped Mesoporous In2O3for Photocatalytic Oxygen Evolution from the In-based Metal-Organic Frameworks.
abstract: 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 In2O3nanocrystalline, 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 In2O3frameworks, providing large specific surface area and active sites for OER. The BG is narrowed to 2.9 from 3.7 eV of the pure In2O3on 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 In2O3nanoparticles obtained from In(OH)3.
authors.affiliation: Key Laboratory for Colloid & Interface Chemistry, Shandong University, Education Ministry, Jinan, 250100, P.R. China.|Key Laboratory of Functional Crystal Materials and Device, Shandong University, Ministry of Education, Jinan, 250100, P.R. China.
authors.forename: Xiaoyu
authors.initials: X
authors.lastname: Gan
authors.affiliation: Key Laboratory of Functional Crystal Materials and Device, Shandong University, Ministry of Education, Jinan, 250100, P.R. China.
authors.forename: Ruijin
authors.initials: R
authors.lastname: Zheng
authors.affiliation: Key Laboratory for Colloid & Interface Chemistry, Shandong University, Education Ministry, Jinan, 250100, P.R. China.
authors.forename: Tianlin
authors.initials: T
authors.lastname: Liu
authors.affiliation: Key Laboratory for Colloid & Interface Chemistry, Shandong University, Education Ministry, Jinan, 250100, P.R. China.
authors.forename: Jiao
authors.initials: J
authors.lastname: Meng
authors.affiliation: State Key Lab of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P.R. China.
authors.forename: Ruiping
authors.initials: R
authors.lastname: Chen
authors.affiliation: Key Laboratory for Colloid & Interface Chemistry, Shandong University, Education Ministry, Jinan, 250100, P.R. China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Sun
authors.affiliation: Key Laboratory of Functional Crystal Materials and Device, Shandong University, Ministry of Education, Jinan, 250100, P.R. China.
authors.forename: Xun
authors.initials: X
authors.lastname: Sun
keywords: N-doping; indium; metal-organic frameworks; oxygen evolution reaction; photocatalyts