Doping Sr and Introducing Oxygen Vacancies in Ba_0.7Sr_0.3TiO_3‐X Synergistically Promote the Pyro‐Photo‐Electric Catalysis Performance

Abstract

The low utilization of light and the severe recombination of charge carriers have always restricted the development of photoelectric catalysis. In this work, the photoelectric catalytic performance is tuned by doping Sr in BaTiO 3 pyroelectric material and simultaneously introducing oxygen vacancies to form double-type defects, combined with pyroelectric polarization. Under the light and 20-50 °C cold-heat cycle, the current density of Ba 0.7 Sr 0.3 TiO 3-X reaches the maximum of 0.92 mA • cm À 2 , which is higher than the current density of Ba 0.7 Sr 0.3 TiO 3-X under only light (0.69 mA • cm À 2 ). Under light alone, the current density of Ba 0.7 Sr 0.3 TiO 3-X is higher than that of BaTiO 3 (0.19 mA • cm À 2 ) and Ba 0.7 Sr 0.3 TiO 3 (0.44 mA • cm À 2 ). This is because the incorporation of Sr can introduce the Fermi level, improve the utilization rate of solar energy, and improve the pyroelectric polarization effect with volume shrinkage, and promote the separation and transfer of carriers. Oxygen vacancies can be used as reactive centers for excited electrons to suppress the recombination of excited electron-hole pairs. Furthermore, the generation of photogenerated and pyrogenerated carriers increases the overall carrier concentration. This provides ideas for the modification of traditional photoelectrodes for photoelectric catalysis water splitting.

Two-dimensional ultra-thin nanosheets optimize the surface reaction dynamics and photo/pyro-generated carrier transfer of NaNbO3 for an efficient pyro-photo-electric catalytic system

“…The performance in this work is superior to previous work. [60][61][62][63] With the above discussion, we explain the principle of the pyroelectric effect of composite electrodes and the efficient internal-external carrier transport channels constructed by the surface modication layer from the perspective of a single crystal cell. As shown in Fig.…”

Strontium-induced phase, energy band and microstructure regulation in Ba1−xSrxTiO3photocatalysts for boosting visible-light photocatalytic activity

“…Recently, the use of strontium ions to occupy the A-site ions of BaTiO 3 to form Ba 1−x Sr x TiO 3 (BST) photocatalysts can be widely used in the photocatalytic decomposition of water to produce hydrogen and dye degradation. [25][26][27][28][29][30][31][32] However, no researchers have yet regulated the phase structure, morphology and photocatalytic activity of BST photocatalysts for photocatalytic degradation of tetracycline hydrochloride (TC-HCl) under simulated sunlight irradiation by adjusting the content of strontium ions. The polyacrylamide gel method is an effective method to synthesize ion-doped semiconductor photocatalysts, but it has not been used to synthesize BST photocatalysts.…”