Molecular sieving of semiconductive NTU-9 coatings on titanium dioxide nanowire arrays: augmented yet selective photoelectrochemical response enabled by boosting charge separation and transfer in confined space
Journal of Colloid and Interface Science(2022)
摘要
Radial heterostructures with titanium dioxide (TiO2) nanowire as core and NTU-9 as shell are synthesized via a surfactant-free approach based on the favorable bonding of linkers with TiO2 nanowire. Relative to the traditional growth strategy of surface modification, the thin NTU-9 shell with ordered arrangement of two-dimensional networks is uniformly formed on the sidewalls of TiO2 nanowire through the orientational growth process. Using the core–shell nanowire arrays as photoanodes, wide-range light absorption and high charge carrier separation efficiency are achieved due to the conjugation of NTU-9, leading to enhanced water oxidation performance in photoelectrochemical (PEC) water splitting. Under appropriately low applied potentials, the photogenerated holes are preferable to accumulate at TiO2/NTU-9/electrolyte three-phase interface and thus the long-range ordered NTU-9 shell can also serve as a size-exclusion filter to improve selectivity toward molecules of different sizes. Consequently, the TiO2/NTU-9 core–shell nanowire array exhibits an augmented and selective PEC response for small size molecules (e.g., H2O2) at a very low potential (–0.25 V vs Ag/AgCl), outperforming the pure TiO2 nanowire array and the counterpart with a grain-boundary-rich NTU-9 shell that is prepared by pretreatment of the TiO2 nanowires with PVP functionalization.
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关键词
Metal oxide/metal–organic frameworks core–shell heterostructures,Orientational growth,Bias-dependent photogenerated hole dynamics,Photoelectrochemical water splitting,Selective photoelectrochemical sensing
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