Ultrathin Cobalt Oxide Interlayer Facilitated Hole Storage for Sustained Water Oxidation over Composited Tantalum Nitride Photoanodes

The hole-storage layer (HSL) strategy has been demonstrated as an efficient interfacial modification method to overcome the instability of tantalum nitride (Ta3N5) photoanodes and further boost high performance in photoelectrochemical (PEC) water oxidation reaction. Herein, we report that the CoOx/Ni(OH)x bilayer as a typical HSL could effectively extract and store photogenerated holes from Ta3N5, resulting in a decent photocurrent enhancement...