Chemical surface tuning electrocatalysis of redox-active nanoparticles

Nan Zhu, Jens Ulstrup, Qijin Chi

Research output: Contribution to conferencePosterResearchpeer-review

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This work focuses on electron transfer (ET) and electrocatalysis of inorganic hybrid Prussian blue nanoparticles (PBNPs, 6 nm) immobilized on different chemical surfaces. Through surface self-assembly chemistry, we have enabled to tune chemical properties of the electrode surface. Stable immobilization of the PBNPs on Au(111) surfaces modified by self-assembled monolayers (SAMs) with various terminal groups including positively charged groups (–NH3+), negatively charged groups (-COO-), and neutral and hydrophobic groups (-CH3) has been achieved. The surface microscopic structures of immobilized PBNPs are characterized by atomic force microscopy (AFM). Reversible electron transfer (ET) was detected by cyclic voltammetry (CV) of the PBNPs on all the surfaces. ET kinetics can be controlled by adjusting the chain length of the SAMs. The rate constants are found to depend exponentially on the ET distance, with a decay factor (β) of ca. 0.9, 1.1, 1.3 per CH2, respectively. This feature suggests a tunneling mechanism adopted by the nanoparticles, resembling that for metalloproteins in a similar assembly. High-efficient electrocatalysis towards the reduction of H2O2 is observed, and possible catalytic mechanisms are discussed.

Original languageEnglish
Publication date2012
Publication statusPublished - 2012
Event63rd Annual Meeting of the International Society of Electrochemistry: Electrochemistry for Advanced Materials, Technologies and Instrumentation - Prague, Czech Republic
Duration: 19 Aug 201224 Aug 2012


Conference63rd Annual Meeting of the International Society of Electrochemistry
Country/TerritoryCzech Republic

Bibliographical note

Awarded the best poster prize.


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