A series of 2D/2D photocatalysts, CuPor-Ph-COF/g-C₃N₄ composites, with superior photocatalytic performance were prepared by a liquid-assisted grinding method.

The development of WO₃-based gas sensors for analysis of acetone in exhaled breath is significant for noninvasive diagnosis of diabetes. A series of Fe-doped hexagonal and monoclinic WO₃ phase−junction (Fe−h/m−WO₃) sensors were synthesized by the hydrothermal calcination method, and the influences of operating temperature and light irradiation on the response were studied. Under light emitting diode (LED) illumination, Fe−h/m−WO₃ exhibited higher responses to acetone than those of the undoped WO₃-based sensors at an operating temperature of 260 °C with 90% relative humidity, and good linearity between response and acetone concentration (0.5 to 2.5 ppm) was achieved under the 90% relative humidity condition. Meanwhile, the optimal Fe−h/m−WO₃ sensor exhibited high selectivity and stability for a duration of three months. The excellent sensing performance of Fe−h/m−WO₃ was attributed to the formation of phase−junction and Fe doping, and these were beneficial for the separation of photon−generated carriers and oxygen adsorption on the WO₃ surface, promoting the generation of superoxide radicals, which was demonstrated by electron paramagnetic resonance and photocurrent tests. Additionally, the Fe−doped WO₃ phase−junction sample also showed good photocatalytic performance for rhodamine B degradation. This study may provide some insights into rational design of new types of gas sensors and offer an alternative for noninvasive diagnosis of diabetes.

Two nitrogen-rich azo-bridged POP displaying high photocatalytic reduction activity for CO ₂ to CO without a sacrificial reagent or metal co-catalyst were prepared.

In this study, Cu and Cu₂O hybrid nanoparticles were synthesized onto the WO₃ nanoflake film using a one-step electrodeposition method. The critical advance is the use of a heterojunction consisting of WO₃ flakes and Cu₂O as an innovative stack design, thereby achieving excellent performance for CO₂ photoreduction with water vapor under visible light irradiation. Notably, with the modified Cu nanoparticles, the selectivity of CH₄ increased from nearly 0% to 96.7%, while that of CO fell down from 94.5% to 0%. The yields of CH₄, H₂ and O₂ reached 2.43, 0.32 and 3.45 mmol/g_cat after 24 h of visible light irradiation, respectively. The boosted photocatalytic performance primarily originated from effective charge-transfer in the heterojunction and acceleration of electron-proton transfer in the presence of Cu nanoparticles. The S-scheme charge transfer mode was further proposed by the in situ-XPS measurement. In this regard, the heterojunction construction showed great significance in the design of efficient catalysts for CO₂ photoreduction application.

Porphyrin-based conjugated organic polymer with dual metal sites displaying high photocatalytic reduction activity for CO₂to CO without a sacrificial reagent and only H₂O.