Limits...
Substrate selection for fundamental studies of electrocatalysts and photoelectrodes: inert potential windows in acidic, neutral, and basic electrolyte.

Benck JD, Pinaud BA, Gorlin Y, Jaramillo TF - PLoS ONE (2014)

Bottom Line: In order to help researchers with the substrate selection process, we employ a consistent experimental methodology to evaluate the electrochemical reactivity and stability of seven potential substrate materials for electrocatalyst and photoelectrode evaluation.We determine the inert potential window for each substrate/electrolyte combination and make recommendations about which materials may be most suitable for application under different experimental conditions.Furthermore, the testing methodology provides a framework for other researchers to evaluate and report the baseline activity of other substrates of interest to the broader community.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering, Stanford University, Stanford, California, United States of America.

ABSTRACT
The selection of an appropriate substrate is an important initial step for many studies of electrochemically active materials. In order to help researchers with the substrate selection process, we employ a consistent experimental methodology to evaluate the electrochemical reactivity and stability of seven potential substrate materials for electrocatalyst and photoelectrode evaluation. Using cyclic voltammetry with a progressively increased scan range, we characterize three transparent conducting oxides (indium tin oxide, fluorine-doped tin oxide, and aluminum-doped zinc oxide) and four opaque conductors (gold, stainless steel 304, glassy carbon, and highly oriented pyrolytic graphite) in three different electrolytes (sulfuric acid, sodium acetate, and sodium hydroxide). We determine the inert potential window for each substrate/electrolyte combination and make recommendations about which materials may be most suitable for application under different experimental conditions. Furthermore, the testing methodology provides a framework for other researchers to evaluate and report the baseline activity of other substrates of interest to the broader community.

Show MeSH
Electrochemical activity and inert potential range for glassy carbon (GC).
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4214636&req=5

pone-0107942-g008: Electrochemical activity and inert potential range for glassy carbon (GC).

Mentions: The main electrochemical reactions expected on glassy carbon are the electrolyte decomposition reactions (i.e. the HER and OER), ion adsorption/desorption, and oxidation/reduction of the glassy carbon surface [15], [49], [51], [54]. As shown in Figure 8, the HER is the main electrochemical feature observed in the cathodic region and limits the inert potential range for each electrolyte. In H2SO4 and NaOH, the HER activity of the glassy carbon increases slightly with potential cycling, possibly due to a reduction of any oxidized surface species or removal of surface impurities. In contrast, the HER activity decreases slightly with potential cycling in the NaAc.


Substrate selection for fundamental studies of electrocatalysts and photoelectrodes: inert potential windows in acidic, neutral, and basic electrolyte.

Benck JD, Pinaud BA, Gorlin Y, Jaramillo TF - PLoS ONE (2014)

Electrochemical activity and inert potential range for glassy carbon (GC).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4214636&req=5

pone-0107942-g008: Electrochemical activity and inert potential range for glassy carbon (GC).
Mentions: The main electrochemical reactions expected on glassy carbon are the electrolyte decomposition reactions (i.e. the HER and OER), ion adsorption/desorption, and oxidation/reduction of the glassy carbon surface [15], [49], [51], [54]. As shown in Figure 8, the HER is the main electrochemical feature observed in the cathodic region and limits the inert potential range for each electrolyte. In H2SO4 and NaOH, the HER activity of the glassy carbon increases slightly with potential cycling, possibly due to a reduction of any oxidized surface species or removal of surface impurities. In contrast, the HER activity decreases slightly with potential cycling in the NaAc.

Bottom Line: In order to help researchers with the substrate selection process, we employ a consistent experimental methodology to evaluate the electrochemical reactivity and stability of seven potential substrate materials for electrocatalyst and photoelectrode evaluation.We determine the inert potential window for each substrate/electrolyte combination and make recommendations about which materials may be most suitable for application under different experimental conditions.Furthermore, the testing methodology provides a framework for other researchers to evaluate and report the baseline activity of other substrates of interest to the broader community.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemical Engineering, Stanford University, Stanford, California, United States of America.

ABSTRACT
The selection of an appropriate substrate is an important initial step for many studies of electrochemically active materials. In order to help researchers with the substrate selection process, we employ a consistent experimental methodology to evaluate the electrochemical reactivity and stability of seven potential substrate materials for electrocatalyst and photoelectrode evaluation. Using cyclic voltammetry with a progressively increased scan range, we characterize three transparent conducting oxides (indium tin oxide, fluorine-doped tin oxide, and aluminum-doped zinc oxide) and four opaque conductors (gold, stainless steel 304, glassy carbon, and highly oriented pyrolytic graphite) in three different electrolytes (sulfuric acid, sodium acetate, and sodium hydroxide). We determine the inert potential window for each substrate/electrolyte combination and make recommendations about which materials may be most suitable for application under different experimental conditions. Furthermore, the testing methodology provides a framework for other researchers to evaluate and report the baseline activity of other substrates of interest to the broader community.

Show MeSH