Shu Yan,Fan Yang,Xianhui Dong,Chao Zhang,Xinda Xu,Zongtao Chi,Woochul Yang,Wanfeng Xie
Real-time monitoring of triethylamine (TEA) is critical to environmental safety and daily life. However, detailed challenges remain for TEA gas sensors, such as low-cost and facile synthetic methods, and low working temperatures. In this study, a combination of hydrothermal and wet chemical approaches is utilized for the rational construction of α -MoO 3 @WO 3 with a sheet-like nanostructure. Additionally, the sensing performances towards triethylamine are investigated. According to the results, it was found that the α -MoO 3 @WO 3 sensor has a higher response value (80.4) and faster response and recovery times (9/26 s) than those of pristine MoO 3 at low optimum temperature (200 °C). Again, the α -MoO 3 @WO 3 based sensor also demonstrated high selectivity to TEA as well as good stability. The enhancement of the MoO 3 @WO 3 sensor's gas-sensitive mechanism may be attributed to the formation of n-n heterojunction between MoO 3 and WO 3 and the synergistic effect of both.
Jiajia Cai,Yongjun Li,Zhi Zhang,Aobo Cui,Zhengxin Cai,Qian Xie,Jianmin Wang
The low sustainable current density in darkness restricts the advancement of photocathodic protection (PCP) for steels in marine environments. A combination of MoO 3 /WO 3 (Mo/WO 3 ) was proposed as an electron storage system to enhance capacitance and charge/discharge rates. Subsequently, incorporating ZnIn 2 S 4 (ZIS) extended light harvesting and improved photocarrier separation efficiency, resulting in efficient round-the-clock PCP performance. Under illumination, the open circuit potential (OCP) of 10Mo/WO 3 @ZIS coupled with 304SS reaches −0.97 V vs. Ag/AgCl, approximately 600 mV and 140 mV more negative than corrosion potential (E corr ) of 304SS and WO 3 @ZIS coupled 304SS, whth photocurrent density of 134 μA/cm 2 . The excellent PCP performance is attributed to superior photocarrier separation and enhanced light-harvesting capability. Notably, in the dark, the OCP of the coupled system remains ca . 0.4 V below the E corr of 304SS, with an average current density of 30 μA/cm 2 , demonstrating the regulated electron storage capabilities of Mo/WO 3 . Furthermore, capacity and charge/discharge rates correlate with Mo/W ratio and electrolyte species. 10Mo/WO 3 @ZIS exhibits a charge capacity of 2.93 mC, nearly 3 times higher than that of WO 3 @ZIS. The innovative application of MoO 3 and WO 3 proves the potential to regulate the electron storage performance, revealing the factors for photoelectron storage/release.
危险品化学品经营许可证（带存储）