Titanium and heteroatom-codoped hematite photoanodes showed significantly increased photoelectrochemical (PEC) water splitting activity. The Ti and heteroatom co-doping in hematite not only suppresses the number of metal ions that cause electron hole pair (EHP) recombination at the hematite surface but also generates an internal electric field for easy hole extraction. The co-doped hematite converted the incident photons to EHPs with much reduced recombination and exhibited an excellent photocurrent density of greater than 2.5 mA/cm~2 at 1.23 V_(RHE). Our co-doping strategy provides a straightforward way of addressing the chronic short-hole diffusion length issue that causes a high electron hole recombination rate, to potentially improve the performance of PEC devices.
展开▼
机译：钛和杂原子编纂的赤铁矿光锅显示出显着增加的光电化学（PEC）水分裂活性。 赤铁矿中的Ti和杂原子共掺杂不仅抑制了在赤铁矿表面上引起电子空穴对（EHP）重组的金属离子的数量，而且还产生内部电场，以便于孔提取。 共掺杂的赤铁矿在1.23V_（rHE）下表现出大于2.5 mA / cm〜2的优异的光电流密度，将入射光子转化为EHP。 我们的共同掺杂策略提供了一种解决慢性短孔扩散长度问题的直接方式，导致高电子空穴复合速率，可能提高PEC器件的性能。
展开▼
