Highly defective carbon nanotubes with improved electrochemical properties by introduction of mesoporous holes on the side walls

作者：Yao, Mengting; Li, Yuanyuan; Nie, Yating; Chen, Houqiang; Wang, Jiao; Chen, Rongsheng^*

来源：Journal of Materials Science, 2022, 57(44): 20567-20579.

DOI：10.1007/s10853-022-07949-4

• ELECTROCATALYTIC ACTIVITY
• STAINLESS-STEEL
• ASCORBIC-ACID
• FABRICATION
• ARRAYS
• DOPAMINE
• NANOPARTICLES
• NANOMATERIALS
• ELECTRODE
• SENSOR

Highly defective carbon nanotubes (HD-CNTs) are fabricated by template carbonization of polydopamine nanofilm coated on mesoporous titanium nitride nanotube arrays. With introduction of mesoporous holes on the side walls from the template, HD-CNTs exhibit much improved electrochemical properties. An ideal Nernst behavior toward [Fe(CN)(6)](3-/4-) redox couple was observed on the HD-CNTs, with a heterogeneous charge transfer rate constant k(0) greater than 0.5 cm/s that is among the fastest kinetics of electrode materials. Sensitive determination of dopamine has been demonstrated in the presence of ascorbic acid and uric acid, with a linear range of 0.1-180 mu M, a detection limit of 0.074 mu M (S/N = 3) and a sensitivity of 555 mu A mM(-1) cm(-2). The excellent electrochemical activity should be attributed to the large number of exposed edge planes on the carbon nanofilm, the free-standing highly conductive titanium nitride architecture that is beneficial for electron transfer, mesoporous morphology that promotes the mass transfer between the nanotubes, and effective ion-accessible surface area. @@@ [GRAPHICS] @@@ .