ZrW 2 O 8 with excellent negative thermal expansion coefficient and anti-reflective property, was successfully introduced onto VO 2 thermochromic films. With an increase in temperature, thermal expansion mismatch appears at the interface between VO 2 and ZrW 2 O 8 layers, and the concave-shaped structures are formed to collect more light. Additionally, ZrW 2 O 8 serves as an anti-reflective coating, which results in a significant enhancement in luminous transmittance . The luminous transmittance of VO 2 /ZrW 2 O 8 and ZrW 2 O 8 /VO 2 /ZrW 2 O 8 films is 71.9% and 75.7%, respectively, which have shown significant improvement compared to 39.8% for intrinsic VO 2 film. In addition, the solar modulation value of VO 2 /ZrW 2 O 8 and ZrW 2 O 8 /VO 2 /ZrW 2 O 8 films have also been improved compared to VO 2 film, and the obtained value for bi-layer film is higher than that of tri-layer film. The results obtained for VO 2 /ZrW 2 O 8 and ZrW 2 O 8 /VO 2 /ZrW 2 O 8 films have shown a remarkable improvement over other bi-layer or tri-layer structures. The described VO 2 /ZrW 2 O 8 and ZrW 2 O 8 /VO 2 /ZrW 2 O 8 films with enhanced luminous transmittance and solar modulation make them promising materials for the application in smart windows .
Zhishan Li,Meilan Peng,Yingru Zhao,Jianhui Li,Yifei Sun
The mismatch of thermal expansion coefficients (TECs) between cobalt-containing perovskite air electrodes and electrolytes is a great challenge for the development of thermo-mechanically durable solid oxide cells (SOCs). In this work, we propose a facile design principle to directly grow highly dispersed Co reactive sites onto ion-conducting scaffolds and confine the dimension of active centres within nanoscale. As a representative, the Co-socketed BaCe0.7Zr0.2Y0.1O3−δ perovskite (denoted as R-BCZY-Co) was constructed via a consecutive sol–gel and in situ exsolution approach. Combined XRD, H2-TPR, SEM and TEM results confirm the emergence of Co nanoparticles on a BCZY matrix without the segregation of a secondary Co-rich phase. The symmetric half-cell measurement suggests that R-BCZY-Co air electrode with the optimal Co content of 10 mol% exhibits a 7-fold promoted oxygen activation performance with a polarization resistance of ∼0.17 Ω cm2 at 750 °C. The TEC mismatch between fabricated R-BCZY-Co electrodes and BCZY electrolytes is minimized down to only ∼11.4%, which is significantly lower than that of other representative counterparts. Moreover, the detailed XPS result proves that the architecture of exsolved Co on BCZY possesses a higher concentration of surface oxygen vacancy, which further benefits the kinetics of ion diffusion and oxygen absorption.
危险品化学品经营许可证（带存储）