Dai-Song Chen,Wen-Bei Yu,Zhao Deng,Jing Liu,Jun Jin,Yu Li,Min Wu,Li-Hua Chen,Bao-Lian Su
Hollow Cu2O microspheres (0.7 to 4 μm in diameter) with two active {111} and {110} facets have been prepared in water/ethylene glycol (H2O/EG) solution via a fast hydrothermal route in only 1 h. Due to the dangling “Cu” atoms in the highly active {111} and {110} facets, the microspheres demonstrate preferential selective adsorption and photodegradation for negatively charged methyl orange (MO), comparing to cationic rhodamine B (RhB) and neutral phenol. The 0.7 μm hollow Cu2O microspheres show the best adsorption capacity and photodegradation performance for MO removal: 49% MO can be adsorbed in 60 min and 99.8% MO can be fully removed under visible light illumination in 80 min, owing to the two active {110} and {111} facets and hollow structure. To exactly evaluate the photocatalytic efficiency, a new methodology is proposed by deducting the adsorption effect. The results show that in spite of 99.2% MO is removed from the solution under visible light illumination in 60 min, 14% MO is still adsorbed on the catalyst, which can be totally removed under further 20 min illumination. Our synthesis strategy presents a new opportunity for the preparation of hollow structures with high active facets. And the proposed accurate evaluation methodology may be extended to other photocatalysts with high adsorption capability for organic pollutants.
Muhammad Waqas,Liyun Wu,Huaguo Tang,Chengzhou Liu,Youjun Fan,Zhe Jiang,Xiaoqu Wang,Jingping Zhong,Wei Chen
Metal oxide-based nano/microstructures assembled on heteroatom-doped carbon nanomaterials are promising materials to design the electrocatalysts with enhanced electrochemical performances. In this work, a systematic protocol was contrived to fabricate hybrid electrode material based on Cu2O microspheres (MSs) supported on sulfur-doped multiwalled carbon nanotubes (Cu2O MSs/S-MWCNTs). The adequate doping of sulfur and successful fabrication of Cu2O MSs/S-MWCNTs were confirmed by various microscopic and spectroscopic techniques, and then the tailor-made Cu2O MSs/S-MWCNTs composite was employed to establish a nonenzymatic sensing system for controlled monitoring of glucose. A high surface area of Cu2O MSs and sulfur doping inside the MWCNTs collectively enhanced the electrocatalytic activity of Cu2O MSs/S-MWCNTs as revealed through cyclic voltammetry (CV) analysis. The enhanced electrochemical efficacy of Cu2O MSs/S-MWCNTs may be credited to the creation of heterojunctions during the doping process, forming the highly defected structures with increased number of catalytic active sites. In addition, the Cu2O MSs/S-MWCNTs/GCE presented the good amperometric response for glucose sensing attaining optimal linear range, satisfactory sensitivity, excellent stability, and glucose specific selectivity. These unique chemical and electrochemical features strongly encourage the potential applicability of our designed Cu2O MSs/S-MWCNT electrocatalyst for targeted monitoring of glucose.
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