Chemical surface tuning electrocatalysis of redox-active nanoparticles

Publication: Research - peer-reviewPoster – Annual report year: 2012

Standard

Chemical surface tuning electrocatalysis of redox-active nanoparticles. / Zhu, Nan; Ulstrup, Jens; Chi, Qijin.

2012. Poster session presented at 63rd Annual Meeting of the International Society of Electrochemistry, Prague, Czech Republic.

Publication: Research - peer-reviewPoster – Annual report year: 2012

Harvard

Zhu, N, Ulstrup, J & Chi, Q 2012, 'Chemical surface tuning electrocatalysis of redox-active nanoparticles' 63rd Annual Meeting of the International Society of Electrochemistry, Prague, Czech Republic, 19/08/12 - 24/08/12,

APA

Zhu, N., Ulstrup, J., & Chi, Q. (2012). Chemical surface tuning electrocatalysis of redox-active nanoparticles. Poster session presented at 63rd Annual Meeting of the International Society of Electrochemistry, Prague, Czech Republic.

CBE

Zhu N, Ulstrup J, Chi Q. 2012. Chemical surface tuning electrocatalysis of redox-active nanoparticles. Poster session presented at 63rd Annual Meeting of the International Society of Electrochemistry, Prague, Czech Republic.

MLA

Vancouver

Zhu N, Ulstrup J, Chi Q. Chemical surface tuning electrocatalysis of redox-active nanoparticles. 2012. Poster session presented at 63rd Annual Meeting of the International Society of Electrochemistry, Prague, Czech Republic.

Author

Zhu, Nan; Ulstrup, Jens; Chi, Qijin / Chemical surface tuning electrocatalysis of redox-active nanoparticles.

2012. Poster session presented at 63rd Annual Meeting of the International Society of Electrochemistry, Prague, Czech Republic.

Publication: Research - peer-reviewPoster – Annual report year: 2012

Bibtex

@misc{53c7f4bcc3aa413d88ce85569521f1e8,
title = "Chemical surface tuning electrocatalysis of redox-active nanoparticles",
author = "Nan Zhu and Jens Ulstrup and Qijin Chi",
note = "Awarded the best poster prize.",
year = "2012",
type = "ConferencePaper <importModel: ConferenceImportModel>",

}

RIS

TY - CONF

T1 - Chemical surface tuning electrocatalysis of redox-active nanoparticles

A1 - Zhu,Nan

A1 - Ulstrup,Jens

A1 - Chi,Qijin

AU - Zhu,Nan

AU - Ulstrup,Jens

AU - Chi,Qijin

PY - 2012

Y1 - 2012

N2 - <p>This work focuses on electron transfer (ET) and electrocatalysis of inorganic hybrid <strong>Prussian blue </strong>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 (–NH<sub>3</sub>+), negatively charged groups (-COO<sup>-</sup>), and neutral and hydrophobic groups (-CH<sub>3</sub>) 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 CH<sub>2</sub>, 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 H<sub>2</sub>O<sub>2</sub> is observed, and possible catalytic mechanisms are discussed.</p>

AB - <p>This work focuses on electron transfer (ET) and electrocatalysis of inorganic hybrid <strong>Prussian blue </strong>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 (–NH<sub>3</sub>+), negatively charged groups (-COO<sup>-</sup>), and neutral and hydrophobic groups (-CH<sub>3</sub>) 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 CH<sub>2</sub>, 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 H<sub>2</sub>O<sub>2</sub> is observed, and possible catalytic mechanisms are discussed.</p>

ER -