Model systems for photocatalytic water reduction: role of pH and metal colloid catalysts

Miller, Deborah S.; McLendon, George

doi:10.1021/ic50217a065

Cited by 72 publications

(37 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The electron-withdrawing/donating property of the R group, e.g., carboxylic group in this work, attached to the α-carbon of the amine also influenced the ECL emission through affecting the stability of the formed radical via hyperconjugation and electron-donating effects [16][17][18][19][20][21][22][23][24][25] . Generally, the carboxylic group was considered to decrease the ECL efficiency of its host molecules because of its electron-withdrawing character at nearly neutral pH [10,[23][24][25] .…”

Section: +mentioning

confidence: 81%

“…Generally, the carboxylic group was considered to decrease the ECL efficiency of its host molecules because of its electron-withdrawing character at nearly neutral pH [10,[23][24][25] . However, as shown in Figures 1 and 2, following the increase in the electrolyte pH, the oxidation currents of EDTA and NTA increased and a higher ECL emission was observed.…”

Section: +mentioning

confidence: 99%

See 1 more Smart Citation

Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Yin

Sha

2009

Sci. China Ser. B-Chem.

View full text Add to dashboard Cite

Due to the highly sensitive electrochemiluminescence (ECL), tris(2,2′-bipyridyl) ruthenium(II) (Ru(bpy) 3 2+ )is often used in the field of bioarrays with the help of co-reactants. However, the generally used co-reactant, tripropylamine (TPA), is toxic, corrosive and volatile. Therefore, the search for safe, sensitive and economical co-reactants is critical. Herein, three aminocarboxylic acids, ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), and 2-hydroxyethylethylene diaminetriacetic acid (HEDTA), have been investigated as potential co-reactants for promoting Ru(bpy) 3 2+ ECL behaviour. A possible ECL mechanism is also presented. The experimental results suggested that the co-reactants have a different ECL behaviour compared to TPA, such as different pH-and surfactant-responses. The detection limits of Ru(bpy) 3 2+ using NTA, EDTA and HEDTA as co-reactants are 1, 60 and 680 fmol·L  1 , respectively. The results indicate that NTA has a much higher efficiency than TPA to excite Ru(bpy) 3 2+ ECL under their own optimal conditions. NTA could be widely used in many fields because it is less toxic, corrosive and volatile than TPA. Moreover, using Ru(bpy) 3 2+ ECL, a sensitive method for the detection of aminocarboxylic acids is also developed. An improvement of four orders of magnitude in detection limits is obtained for EDTA compared to the known Ru(bpy) 3 2+ chemiluminescent methods.Ru(bpy) 3 2+, electrochemiluminescence, co-reactants, aminocarboxylic acids

show abstract

Section: +mentioning

confidence: 81%

Section: +mentioning

confidence: 99%

Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Yin

Sha

2009

Sci. China Ser. B-Chem.

View full text Add to dashboard Cite

show abstract

“…However, the donating ability of EDTA decreases due to protonation of EDTA at low pH. [25] The photosensitized hydrogen evolution process should occur at an optimized pH.…”

Section: Wwwchemcatchemorgmentioning

confidence: 99%

Stable and Efficient Homogeneous Photocatalytic H₂ Evolution Based on Water Soluble Pyrenetetrasulfonic Acid Functionalized Platinum Nanocomposites

Zhu

et al. 2011

ChemCatChem

View full text Add to dashboard Cite

Herein, 1,3,6,8‐pyrenetetrasulfonic acid (PTSA) functionalized Pt nanocomposites were synthesized and characterized by UV/vis, X‐ray photoelectron spectroscopic (XPS), FTIR, TEM, and XRD methods. Pyrenetetrasulfonic acid was not only used as the stabilizer to prevent agglomeration of Pt nanoparticles but also served as the light‐harvesting photosensitizer, absorbing irradiating light and transferring photoexited electrons to the platinum nanoparticles. The occurrence of the photoinduced electron transfer process was confirmed by the combination of time‐resolved fluorescence and photoelectrochemical spectral measurements. Photocatalytic results showed that PTSA functionalized Pt nanocomposites could be used as stable photocatalysts for photoinducing H2 evolution. At the optimal reaction conditions (nPt:nPTSA=100, pH 3), enhanced amounts of hydrogen were evolved from the system under UV/vis irradiation in the absence of an electron mediator. The corresponding amount of hydrogen evolution was 125.1 μmol for 12 h exposure to UV/vis irradiation, and the apparent quantum efficiency at a wavelength of λ=365 nm was 11.5 %.

show abstract

“…), can be matched to the water reduction potential, thereby establishing the driving force for hydrogen evolution. [51][52][53] Pd-DMAP nanoparticles were deposited into an ultrathin Nafion film on glass, which was used as the substrate for SECM approach curve measurements. As shown in Figure 1, a tip ultramicroelectrode (UME) is positioned a distance, d, above the substrate surface while generating the reductant, MV þ. , from the diffusion-limited reduction of methyl viologen dication (MV 2þ ) present in bulk solution (Eq.…”

Section: Secm Theory and Simulationsmentioning

confidence: 99%

Incorporation of Functionalized Palladium Nanoparticles within Ultrathin Nafion Films: A Nanostructured Composite for Electrolytic and Redox‐Mediated Hydrogen Evolution

Li¹,

Bertoncello²,

Ciani³

et al. 2008

Adv Funct Materials

View full text Add to dashboard Cite

A novel ultrathin Nafion‐palladium nanocomposite film is developed by incorporating positively charged Pd nanoparticles, stabilized with dimethylaminopyridine (DMAP), into Nafion Langmuir‐Schaefer (LS) films. The films show considerable activity for the redox‐catalyzed hydrogen‐evolution reaction, the rate of which scales with film thickness. The Nafion film can be deposited on both insulating (glass) and electrode (indium‐tin oxide) surfaces. The quantity of Pd nanoparticles immobilized can be controlled simply via the thickness of the Nafion film. The morphology of the films are investigated using AFM, which allows the number density of nanoparticles to be estimated for the thinnest (10 layers; 18 nm) films. Incorporation of nanoparticles is also determined with cyclic voltammetry and UV‐visible spectroscopy. The former method allows estimation of the electrochemically active surface area of Pd wired to the underlying electrode. A novel scanning electrochemical microscopy (SECM) approach is used to investigate the kinetics of the hydrogen evolution reaction (HER) catalyzed by Pd nanoparticles within the Nafion film, which allows the intrinsic activity to be determined. Single nanoparticle reactivities are extracted and are comparable to the activity of native nanoparticles on glass and to bulk Pd. It is found that neither Nafion encapsulation nor DMAP functionalization impair the electrocatalytic activity of these nanoparticles towards the HER. Nafion encapsulation thus provides a framework for the formation of interfaces, whose activity scales with film thickness. The creation of 3D materials opens up the possibility of carrying out redox‐mediated hydrogen evolution using solution species as the electron donor.

show abstract

Model systems for photocatalytic water reduction: role of pH and metal colloid catalysts

Cited by 72 publications

References 3 publications

Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Stable and Efficient Homogeneous Photocatalytic H₂ Evolution Based on Water Soluble Pyrenetetrasulfonic Acid Functionalized Platinum Nanocomposites

Incorporation of Functionalized Palladium Nanoparticles within Ultrathin Nafion Films: A Nanostructured Composite for Electrolytic and Redox‐Mediated Hydrogen Evolution

Contact Info

Product

Resources

About

Model systems for photocatalytic water reduction: role of pH and metal colloid catalysts

Cited by 72 publications

References 3 publications

Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Electrochemiluminescence from tris(2,2′-bipyridyl) ruthenium (II) in the presence of aminocarboxylic acid co-reactants

Stable and Efficient Homogeneous Photocatalytic H2 Evolution Based on Water Soluble Pyrenetetrasulfonic Acid Functionalized Platinum Nanocomposites

Incorporation of Functionalized Palladium Nanoparticles within Ultrathin Nafion Films: A Nanostructured Composite for Electrolytic and Redox‐Mediated Hydrogen Evolution

Contact Info

Product

Resources

About

Stable and Efficient Homogeneous Photocatalytic H₂ Evolution Based on Water Soluble Pyrenetetrasulfonic Acid Functionalized Platinum Nanocomposites