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Volume 172, 2014
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Nanodiamond surface redox chemistry: influence of physicochemical properties on catalytic processes

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Abstract

Modification of an electrode with an immobilised layer of nanodiamond is found to significantly enhance the recorded currents for reversible oxidation of ferrocene methanol (FcMeOH). Current enhancement is related to nanodiamond diameter, with enhancement increasing in the order 1000 nm < 250 nm < 100 nm < 10 nm < 5 nm. We attribute the current enhancement to two catalytic processes: i) electron transfer between the solution redox species and redox-active groups on the nanodiamond surface; ii) electron transfer mediated by FcMeOH+ adsorbed onto the nanodiamond surface. The first process is pH dependent as it depends on nanodiamond surface functionalities for which electron transfer is coupled to proton transfer. The adsorption-mediated process is observed most readily at slow scan rates and is due to self-exchange between adsorbed FcMeOH+ and FcMeOH in solution. FcMeOH+ has a strong electrostatic affinity for the nanodiamond surface, as confirmed by in situ infrared (IR) experiments.

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Publication details

The article was received on 17 Mar 2014, accepted on 18 Mar 2014 and first published on 20 Mar 2014


Article type: Paper
DOI: 10.1039/C4FD00041B
Citation: Faraday Discuss., 2014,172, 349-364
  • Open access: Creative Commons BY license
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    Nanodiamond surface redox chemistry: influence of physicochemical properties on catalytic processes

    T. S. Varley, M. Hirani, G. Harrison and K. B. Holt, Faraday Discuss., 2014, 172, 349
    DOI: 10.1039/C4FD00041B

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