标题： 缺陷和应变黑色三氧化二铋上的高效光催化产氢 显示英文标题

标题： Efficient Photocatalytic Hydrogen Production on Defective and Strained Black Bismuth (III) Oxide

摘要： 氧化铋（III）（Bi2O3）因其低带隙而被广泛研究作为绿色氢气生产的光催化剂，但其效率仍需提高。 本研究通过高压剪切方法，在高压下对Bi2O3进行严重应变处理，合成出具有缺陷和应变的黑色Bi2O3，以提高其光催化产氢性能。 富含氧空位的材料在水分解中表现出十倍的改善，并具有优异的循环稳定性。 这种改进是由于光吸收的改善、带隙的缩小以及辐射电子-空穴复合的减少。 此外，价带底部能量因应变而正向增加，导致产氢的高过电位。 这项研究突显了空位和晶格应变在开发用于水分解的无掺杂活性催化剂方面的潜力。 显示英文摘要

摘要： Bismuth (III) oxide (Bi2O3) has been highly studied as a photocatalyst for green hydrogen production due to its low band gap, yet its efficiency requires enhancement. This study synthesizes a defective and strained black Bi2O3 by severe straining under high pressure, via a high-pressure torsion method, to improve its photocatalytic hydrogen production. The material rich in oxygen vacancies exhibits a ten-fold improvement in water splitting with excellent cycling stability. Such improvement is due to improved light absorption, narrowing band gap and reduced irradiative electron-hole recombination. Moreover, the valence band bottom energy positively increases by straining leading to a high overpotential for hydrogen production. This research highlights the potential of vacancies and lattice strain in developing dopant-free active catalysts for water splitting.