Significantly accelerated direct electron-transfer kinetics of hemoglobin in a C(60)-MWCNT nanocomposite film.
The direct electrochemistry of hemoglobin (Hb) was studied in a novel all-carbon nanocomposite film of C(60)-MWCNT (MWCNT=multiple-walled carbon nanotube) and compared with that in bare MWCNT film. The heterogeneous electron-transfer rate constant k(s) of Hb/C(60)-MWCNT was determined to be 0.39 s(-1), which is more than one order of magnitude greater than that of Hb/MWCNT (0.03 s(-1)). The significantly accelerated electron-transfer kinetics are attributed to the mediator role played by C(60), which is finely dispersed on the MWCNT surfaces. The excellent stability of Hb/C(60)-MWCNT was established and its potential application towards the electrocatalytic reduction of O(2) was demonstrated.
Zhang
Hua
H
Department of Chemistry, Beijing Normal University, Beijing, China.
Fan
Louzhen
L
Yang
Shihe
S
D004563:Electrochemistry; D004566:Electrodes; D004583:Electrons; D037741:Fullerenes / Q000737:chemistry*; D006454:Hemoglobins / Q000737:chemistry*; D007700:Kinetics; D053761:Nanocomposites / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*
D037741:Fullerenes; D006454:Hemoglobins; D037742:Nanotubes, Carbon; C069837:fullerene C60