Cobalt porphyrin immobilized on the TiO2 nanotube electrode for CO2 electroreduction in aqueous solution |
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作者姓名: | Shengshen Gu Aleksei N.Marianov Yuxiang Zhu Yijiao Jiang |
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作者单位: | School of Engineering |
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基金项目: | Financial support from the ARC Discovery Project(DP1901013720)。 |
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摘 要: | Herein we report CO2 electrochemical reduction reaction(CO2 ERR)on the cobalt tetraphenylporphyrin(Co TPP)modified TiO2 nanotube(TNT)electrode.It was found the axial coordination of drop-casting solvent to Co TPP and the porphyrin structure are the major factors that have significant effects on the catalytic performance of the electrode.As confirmed by spectrophotometric titration,pyridine has a stronger coordination bond to Co TPP than DMF and THF thus leading to the highest efficiency among the dropcasting solvents tested in the study.Based on the spectrophotometric analysis,possible coordination mechanism between drop-casting solvents and Co TPP is put forward.On the other hand,introduction of-COOMe substituents in phenyl rings of Co TPP weakens the coordination bond between pyridine and Co TPP as clearly evidenced by deuterium NMR spectra,resulting in a detrimental effect on CO2 ERR.Therefore,the manipulation of the coordination environment around the metal center of immobilized catalyst is crucial in designing an efficient electrocatalytic system.
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关 键 词: | CO2electroreduction Co porphyrins Immobilization Drop-casting solvent Axial coordination |
Cobalt porphyrin immobilized on the TiO_2 nanotube electrode for CO_2 electroreduction in aqueous solution |
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