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Photocatalytic and Electrocatalytic Properties of Cu-Loaded ZIF-67-Derivatized Bean Sprout-Like $Co-TiO_{2}$/Ti Nanostructures
| Content Provider | MDPI |
|---|---|
| Author | Jang, Hye Park, So Yang, Ju Hong, Sung-Min Rhee, Choong Sohn, Youngku |
| Copyright Year | 2021 |
| Description | ZIF-derivatized catalysts have shown high potential in catalysis. Herein, bean sprout-like $Co-TiO_{2}$/Ti nanostructures were first synthesized by thermal treatment at 800 °C under Ar-flow conditions using sacrificial ZIF-67 templated on Ti sheets. It was observed that ZIF-67 on Ti sheets started to thermally decompose at around 350 °C and was converted to the cubic phase $Co_{3}O_{4}$. The head of the bean sprout structure was observed to be $Co_{3}O_{4}$, while the stem showed a crystal structure of rutile $TiO_{2}$ grown from the metallic Ti support. Cu sputter-deposited $Co-TiO_{2}$/Ti nanostructures were also prepared for photocatalytic and electrocatalytic $CO_{2}$ reduction performances, as well as electrochemical oxygen reaction (OER). Gas chromatography results after photocatalytic $CO_{2}$ reduction showed that $CH_{3}$OH, CO and $CH_{4}$ were produced as major products with the highest MeOH selectivity of 64% and minor $C_{2}$ compounds of $C_{2}H_{2}$, $C_{2}H_{4}$ and $C_{2}H_{6}$. For electrocatalytic $CO_{2}$ reduction, CO, $CH_{4}$ and $C_{2}H_{4}$ were meaningfully detected, but $H_{2}$ was dominantly produced. The amounts were observed to be dependent on the Cu deposition amount. Electrochemical OER performances in 0.1 M KOH electrolyte exhibited onset overpotentials of 330–430 mV (vs. RHE) and Tafel slopes of 117–134 mV/dec that were dependent on Cu-loading thickness. The present unique results provide useful information for synthesis of bean sprout-like $Co-TiO_{2}$/Ti hybrid nanostructures and their applications to $CO_{2}$ reduction and electrochemical water splitting in energy and environmental fields. |
| Starting Page | 1904 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano11081904 |
| Journal | Nanomaterials |
| Issue Number | 8 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-07-24 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Inorganic Chemistry Zif-67 Co-tio2/ti Photocatalytic Co2 Reduction Electrocatalytic Co2 Reduction Oxygen Evolution Reaction Water Splitting |
| Content Type | Text |
| Resource Type | Article |
