Comparison of nanostructured silver-modified silver and carbon ultramicroelectrodes for electrochemical detection of nitrate

Hamid R. Lotfi Zadeh Zhad, Rebecca Y. Lai

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We report the use of silver (Ag)-modified carbon and Ag ultramicroelectrodes (UMEs) for electrochemical detection of nitrate. We investigated several methods for electrodeposition of Ag; our results show that the addition of a complexation agent (ammonium sulfate) in the Ag deposition solution is necessary for electrodeposition of nanostructured Ag that adheres well to the electrode. The electrodeposited Ag on both types of electrodes has branch-like structures that are well-suited for electrocatalytic reduction of nitrate. The use of UMEs is advantageous; the sigmoidal-shaped cyclic voltammogram allows for sensitive detection of nitrate by reducing the capacitive current, as well as enabling easy quantification of the nitrate reduction current. Both cyclic voltammetry and chronoamperometry were used to characterize the electrodes; and independent of the electrochemical interrogation technique, both UMEs were found to have a wide linear dynamic range (4-1000 μM) and a low limit of detection (3.2-5.1 μM). More importantly, they are reusable up to ~100 interrogation cycles and are selective enough to be used for direct detection of nitrate in a synthetic aquifer sample without any sample pretreatment and/or pH adjustment.

Original languageEnglish (US)
Pages (from-to)153-159
Number of pages7
JournalAnalytica Chimica Acta
Volume892
DOIs
StatePublished - Sep 10 2015

Fingerprint

Silver
Nitrates
silver
Carbon
nitrate
Electroplating
carbon
Electrodes
electrode
Electrodeposition
Electrochemical Techniques
Chronoamperometry
Groundwater
Ammonium Sulfate
ammonium sulfate
Complexation
Aquifers
complexation
Cyclic voltammetry
Limit of Detection

Keywords

  • Carbon fiber ultramicroelectrode
  • Chronoamperometry
  • Cyclic voltammetry
  • Electrodeposited silver
  • Nitrate
  • Silver ultramicroelectrode

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

Cite this

Comparison of nanostructured silver-modified silver and carbon ultramicroelectrodes for electrochemical detection of nitrate. / Lotfi Zadeh Zhad, Hamid R.; Lai, Rebecca Y.

In: Analytica Chimica Acta, Vol. 892, 10.09.2015, p. 153-159.

Research output: Contribution to journalArticle

@article{7a62c7d1d0ea4f66900a9b77f933682c,
title = "Comparison of nanostructured silver-modified silver and carbon ultramicroelectrodes for electrochemical detection of nitrate",
abstract = "We report the use of silver (Ag)-modified carbon and Ag ultramicroelectrodes (UMEs) for electrochemical detection of nitrate. We investigated several methods for electrodeposition of Ag; our results show that the addition of a complexation agent (ammonium sulfate) in the Ag deposition solution is necessary for electrodeposition of nanostructured Ag that adheres well to the electrode. The electrodeposited Ag on both types of electrodes has branch-like structures that are well-suited for electrocatalytic reduction of nitrate. The use of UMEs is advantageous; the sigmoidal-shaped cyclic voltammogram allows for sensitive detection of nitrate by reducing the capacitive current, as well as enabling easy quantification of the nitrate reduction current. Both cyclic voltammetry and chronoamperometry were used to characterize the electrodes; and independent of the electrochemical interrogation technique, both UMEs were found to have a wide linear dynamic range (4-1000 μM) and a low limit of detection (3.2-5.1 μM). More importantly, they are reusable up to ~100 interrogation cycles and are selective enough to be used for direct detection of nitrate in a synthetic aquifer sample without any sample pretreatment and/or pH adjustment.",
keywords = "Carbon fiber ultramicroelectrode, Chronoamperometry, Cyclic voltammetry, Electrodeposited silver, Nitrate, Silver ultramicroelectrode",
author = "{Lotfi Zadeh Zhad}, {Hamid R.} and Lai, {Rebecca Y.}",
year = "2015",
month = "9",
day = "10",
doi = "10.1016/j.aca.2015.08.022",
language = "English (US)",
volume = "892",
pages = "153--159",
journal = "Analytica Chimica Acta",
issn = "0003-2670",
publisher = "Elsevier",

}

TY - JOUR

T1 - Comparison of nanostructured silver-modified silver and carbon ultramicroelectrodes for electrochemical detection of nitrate

AU - Lotfi Zadeh Zhad, Hamid R.

AU - Lai, Rebecca Y.

PY - 2015/9/10

Y1 - 2015/9/10

N2 - We report the use of silver (Ag)-modified carbon and Ag ultramicroelectrodes (UMEs) for electrochemical detection of nitrate. We investigated several methods for electrodeposition of Ag; our results show that the addition of a complexation agent (ammonium sulfate) in the Ag deposition solution is necessary for electrodeposition of nanostructured Ag that adheres well to the electrode. The electrodeposited Ag on both types of electrodes has branch-like structures that are well-suited for electrocatalytic reduction of nitrate. The use of UMEs is advantageous; the sigmoidal-shaped cyclic voltammogram allows for sensitive detection of nitrate by reducing the capacitive current, as well as enabling easy quantification of the nitrate reduction current. Both cyclic voltammetry and chronoamperometry were used to characterize the electrodes; and independent of the electrochemical interrogation technique, both UMEs were found to have a wide linear dynamic range (4-1000 μM) and a low limit of detection (3.2-5.1 μM). More importantly, they are reusable up to ~100 interrogation cycles and are selective enough to be used for direct detection of nitrate in a synthetic aquifer sample without any sample pretreatment and/or pH adjustment.

AB - We report the use of silver (Ag)-modified carbon and Ag ultramicroelectrodes (UMEs) for electrochemical detection of nitrate. We investigated several methods for electrodeposition of Ag; our results show that the addition of a complexation agent (ammonium sulfate) in the Ag deposition solution is necessary for electrodeposition of nanostructured Ag that adheres well to the electrode. The electrodeposited Ag on both types of electrodes has branch-like structures that are well-suited for electrocatalytic reduction of nitrate. The use of UMEs is advantageous; the sigmoidal-shaped cyclic voltammogram allows for sensitive detection of nitrate by reducing the capacitive current, as well as enabling easy quantification of the nitrate reduction current. Both cyclic voltammetry and chronoamperometry were used to characterize the electrodes; and independent of the electrochemical interrogation technique, both UMEs were found to have a wide linear dynamic range (4-1000 μM) and a low limit of detection (3.2-5.1 μM). More importantly, they are reusable up to ~100 interrogation cycles and are selective enough to be used for direct detection of nitrate in a synthetic aquifer sample without any sample pretreatment and/or pH adjustment.

KW - Carbon fiber ultramicroelectrode

KW - Chronoamperometry

KW - Cyclic voltammetry

KW - Electrodeposited silver

KW - Nitrate

KW - Silver ultramicroelectrode

UR - http://www.scopus.com/inward/record.url?scp=84941881162&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84941881162&partnerID=8YFLogxK

U2 - 10.1016/j.aca.2015.08.022

DO - 10.1016/j.aca.2015.08.022

M3 - Article

C2 - 26388486

AN - SCOPUS:84941881162

VL - 892

SP - 153

EP - 159

JO - Analytica Chimica Acta

JF - Analytica Chimica Acta

SN - 0003-2670

ER -