Han, Sung Gyu Chae, Sang Youn Lee, Si Young Min, Byoung Koun Hwang, Yun Jeong 2024-01-19T23:32:54Z 2024-01-19T23:32:54Z 2021-09-03 2018-01-28 1463-9076 https://pubs.kist.re.kr/handle/201004/121794 Here, we successfully synthesized a Ta3N5 thin film using a simple metal-organic-precursor decomposition process followed by its conversion to nitride and studied its photoelectrochemical (PEC) properties to understand charge separation on the surface. Newly synthesized Ta3N5 photoanodes showed a significant difference in the PEC activity in relation to the annealing temperature under ammonia flow, although similar light absorption properties or electronic states were obtained. Charge separation related PEC properties were analyzed using intensity modulated photocurrent density spectroscopy (IMPS) and photocurrent measurements in the absence/presence of scavengers. The charge transfer and recombination rate constants which are related to the photogenerated charge-separation dynamics on the Ta3N5 surface were found to be more sensitively influenced by the ammonia annealing temperatures, and low temperature (700 degrees C) treated Ta3N5 showed a fast recombination rate constant (k(r)). In addition, high-efficiency charge injection into the electrolyte on the surface was critically associated with the greatly enhanced photocurrent density of Ta3N5 synthesized at a higher temperature (900 degrees C) of ammonia annealing. English ROYAL SOC CHEMISTRY VISIBLE-LIGHT WATER OXIDATION PHOTOCURRENT SPECTROSCOPY HYDROGEN-PRODUCTION NANOROD ARRAYS TANTALUM PHOTOCATALYSTS LAYER PHOTOELECTRODES DEPOSITION Charge separation properties of Ta3N5 photoanodes synthesized via a simple metal-organic-precursor decomposition process Article 10.1039/c7cp05406h 1 PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.20, no.4, pp.2865 - 2871 PHYSICAL CHEMISTRY CHEMICAL PHYSICS 20 4 2865 2871 scie scopus 000423505500073 2-s2.0-85041217464 Chemistry, Physical Physics, Atomic, Molecular & Chemical Chemistry Physics Article VISIBLE-LIGHT WATER OXIDATION PHOTOCURRENT SPECTROSCOPY HYDROGEN-PRODUCTION NANOROD ARRAYS TANTALUM PHOTOCATALYSTS LAYER PHOTOELECTRODES DEPOSITION water splitting Ta3N5 Photoelectrochemistry