标题：N-Doped Mesoporous In2O3 for Photocatalytic Oxygen Evolution from the In-based Metal-Organic Frameworks
作者：Gan, Xiaoyu; Zheng, Ruijin; Liu, Tianlin; Meng, Jiao; Chen, Ruiping; Sun, Xuan; Sun, Xun
作者机构：[Gan, Xiaoyu; Liu, Tianlin; Meng, Jiao; Sun, Xuan] Shandong Univ, Educ Minist, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China.; [Ga 更多
通讯作者地址：[Sun, X]Shandong Univ, Educ Minist, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China;[Sun, X]Shandong Univ, Minist Educ, Key Lab Funct 更多
来源：CHEMISTRY-A EUROPEAN JOURNAL
关键词：indium; metal-organic frameworks; N-doping; oxygen evolution reaction;; photocatalyts
摘要：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).