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ZhaoHong Meng,LuHe Wan,LiJuan Zhang,ShuYing Zang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Ce, N codoped TiO2 nano-particles were fabricated through sol–gel strategy in the absence of water. Results revealed that Ce was not implanted into the lattice of TiO2 and existed as the forms of smallcluster CeO2 which uniformly diffused onto the surface or interstitial site of TiO2, while N dopants weresuccessfully incorporated into the structure of TiO2 by substituting the lattice oxygen atoms and existedas the forms of N–Ti–O bonds, thereby resulting in the formation of impurity level above the valenceband of TiO2 and enhancement of visible photocatalytic (PC) performance. The enhanced visible PCmechanism was discussed.
Bihua Hu,Zhaohong Tang,Zhi Zhang,Jinqing Linghu,Jihong Qian,Xiangyun Qin,Bumin Meng,Rong Han 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.12
Currently, Z-source networks are widely employed to extend the output-voltage range of inverters operating at a low voltage DC source. However, these inverters are troubled by low power-conversion efficiency and an obvious current distortion due to the copper losses and core losses of the inductors. In addition, they have limited voltage levels. In this paper, a novel boost network composed of two power switches, two capacitors, and two diodes is proposed to overcome these shortcomings. Meanwhile, a corresponding modulation strategy is also set forth to achieve capacitor voltage self-balancing and to regulate the output AC voltage. Moreover, by adding more switched-capacitor cells, the range of the output voltage can be further improved, and the max DC/AC-voltage conversion ratio of the inverter with n cells is √3( n + 1)/3. At last, an inverter prototype with a 1 kW power rating is built, and the obtained results demonstrate that this inverter possesses the following superiorities: a wider range of output voltage, automatic balancing of the capacitor voltage, less current distortion, and high-efficiency power conversion.