Bipolar electrochemical mechanism for the propulsion of catalytic nanomotors in hydrogen peroxide solutions

Yang Wang, Rose M. Hernandez, David J. Bartlett, Julia M. Bingham, Timothy R. Kline, Ayusman Sen, Thomas E. Mallouk

Research output: Contribution to journalArticle

329 Citations (Scopus)

Abstract

Bimetallic nanorods are propelled in aqueous solutions by the catalytic decomposition of hydrogen peroxide to oxygen and water. Several mechanisms (interfacial tension gradients, bubble recoil, viscous Brownian ratchet, self-electrophoresis) have been proposed for the transduction of chemical to mechanical energy in this system. From Tafel plots of anodic and cathodic hydrogen peroxide reactions at various metal (Au, Pt, Rh, Ni, Ru, and Pd) ultramicroelectrodes, we determine the potential at which the anodic and cathodic reaction rates are equal for each metal. These measurements allow one to predict the direction of motion of all possible bimetallic combinations according to the bipolar electrochemical (or self-electrophoretic) mechanism. These predictions are consistent with the observed direction of motion in all cases studied, providing strong support for the mechanism. We also find that segmented nanorods with one Au end and one poly(pyrrole) end containing catalase, an enzyme that decomposes hydrogen peroxide nonelectrochemically, perform the overall catalytic reaction at a rate similar to that of nanorods containing Au and Pt segments. However, in this case there is no observed axial movement, again supporting the bipolar electrochemical propulsion mechanism for bimetallic nanorods.

Original languageEnglish (US)
Pages (from-to)10451-10456
Number of pages6
JournalLangmuir
Volume22
Issue number25
DOIs
StatePublished - Dec 5 2006

Fingerprint

propulsion
Nanorods
hydrogen peroxide
Hydrogen peroxide
Hydrogen Peroxide
Propulsion
nanorods
Metals
catalase
Pyrroles
pyrroles
electrophoresis
Electrophoresis
metals
Catalase
Reaction rates
Surface tension
enzymes
interfacial tension
reaction kinetics

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

Wang, Y., Hernandez, R. M., Bartlett, D. J., Bingham, J. M., Kline, T. R., Sen, A., & Mallouk, T. E. (2006). Bipolar electrochemical mechanism for the propulsion of catalytic nanomotors in hydrogen peroxide solutions. Langmuir, 22(25), 10451-10456. https://doi.org/10.1021/la0615950
Wang, Yang ; Hernandez, Rose M. ; Bartlett, David J. ; Bingham, Julia M. ; Kline, Timothy R. ; Sen, Ayusman ; Mallouk, Thomas E. / Bipolar electrochemical mechanism for the propulsion of catalytic nanomotors in hydrogen peroxide solutions. In: Langmuir. 2006 ; Vol. 22, No. 25. pp. 10451-10456.
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Wang, Y, Hernandez, RM, Bartlett, DJ, Bingham, JM, Kline, TR, Sen, A & Mallouk, TE 2006, 'Bipolar electrochemical mechanism for the propulsion of catalytic nanomotors in hydrogen peroxide solutions', Langmuir, vol. 22, no. 25, pp. 10451-10456. https://doi.org/10.1021/la0615950

Bipolar electrochemical mechanism for the propulsion of catalytic nanomotors in hydrogen peroxide solutions. / Wang, Yang; Hernandez, Rose M.; Bartlett, David J.; Bingham, Julia M.; Kline, Timothy R.; Sen, Ayusman; Mallouk, Thomas E.

In: Langmuir, Vol. 22, No. 25, 05.12.2006, p. 10451-10456.

Research output: Contribution to journalArticle

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AU - Sen, Ayusman

AU - Mallouk, Thomas E.

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