TY  - JOUR
AU  - Yoon, Ji Won
AU  - Kim, Jae-Hyeok
AU  - Jo, Young-Moo
AU  - Lee, Jong-Heun
PY  - 2022
TI  - Heterojunction between bimetallic metal-organic framework and TiO2: Band-structure engineering for effective photoelectrochemical water splitting
JO  - Nano Research
SN  - 1998-0124
SP  - 8502
EP  - 8509
VL  - 15
IS  - 9
AB  - Bimetallic Fe/Ni-based metal-organic frameworks (MOFs) with different Fe/Ni ratios were coated on TiO2 nanorods (NRs), and the performances of the heterojunction photoanodes in photoelectrochemical water splitting were investigated. The bandgaps and band positions of the MOFs could be modulated by changing the ratio of the Fe and Ni components. An ideal band alignment was achieved between the TiO2 NRs and bimetallic MOFs with an optimum ratio of [Fe]/[Ni] = 0.25/0.75, which allowed efficient light absorption and charge separation. The coating of NH2-MIL(Fe)-88 layer on the TiO2 NRs decreased the photocurrent density by 33%. In comparison, TiO2/NH2-MIL(Ni)-88 showed a modest improvement in photocurrent density (0.85 mA·cm−2 at 1.23 V vs. a reversible hydrogen electrode (RHE)). When bimetallic NH2-MIL(Fe0.25Ni0.75)-88 was coated on the TiO2 NRs, the photocurrent density reached 1.56 mA·cm−2, which was an efficiency enhancement of 3.2 times. The mechanism underlying high photoelectrochemical performance was investigated.
UR  - https://doi.org/10.1007/s12274-022-4451-y
DO  - 10.1007/s12274-022-4451-y