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A facile approach to prepare silicon-based Pt-Ag tubular dendritic nano-forests (tDNFs) for solar-light-enhanced methanol oxidation reaction.

Lin CT, Shiao MH, Chang MN, Chu N, Chen YW, Peng YH, Liao BH, Huang HJ, Hsiao CN, Tseng FG - Nanoscale Res Lett (2015)

Bottom Line: In the first GRR, a homogeneous layer of silver dendritic nano-forests (DNFs) with 10 μm in thickness was grown on Si wafer in 5 min in silver nitride (AgNO3) and buffer oxide etchant (BOE) solution.In the second GRR, we utilized chloroplatinic acid (H2PtCl6) as the precursor for platinum (Pt) deposition to further transform the prepared Ag DNFs into Pt-Ag tDNFs.Current results provide a cost-effective and facile approach to prepare solar-driven metallic electrodes potentially applicable to photo-electro-chemical fuel cells.

View Article: PubMed Central - PubMed

Affiliation: Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu, 300 Taiwan ; Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 300 Taiwan.

ABSTRACT
In this paper, a facile two-step Galvanic replacement reaction (GRR) is proposed to prepare Pt-Ag tubular dendritic nano-forests (tDNFs) in ambient condition for enhancing methanol oxidation reaction (MOR) under solar illumination. In the first GRR, a homogeneous layer of silver dendritic nano-forests (DNFs) with 10 μm in thickness was grown on Si wafer in 5 min in silver nitride (AgNO3) and buffer oxide etchant (BOE) solution. In the second GRR, we utilized chloroplatinic acid (H2PtCl6) as the precursor for platinum (Pt) deposition to further transform the prepared Ag DNFs into Pt-Ag tDNFs. The catalytic performance and solar response of the Pt-Ag tDNFs toward methanol electro-oxidation are also studied by cyclic voltammetry (CV) and chronoamperometry (CA). The methanol oxidation current was boosted by 6.4% under solar illumination on the Pt-Ag tDNFs due to the induced localized surface plasmon resonance (LSPR) on the dendritic structure. Current results provide a cost-effective and facile approach to prepare solar-driven metallic electrodes potentially applicable to photo-electro-chemical fuel cells.

No MeSH data available.


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The schematic drawing of the two-step GRR process.
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Fig1: The schematic drawing of the two-step GRR process.

Mentions: A two-step-GRR is proposed to prepare the Si-based Pt-Ag tDNFs as shown in Figure 1. In the first step of GRR, a fluoride-assisted GRR (FAGRR) [30] was adopted to prepare the Ag dendritic nanoforests (Ag DNFs) on planar silicon. In a typical process, n-type silicon (2 cm × 2 cm) was dipped into 2.5 mM silver nitride (AgNO3) + 25% (v/v) buffered oxide etchant (BOE) (comprising 34% NH4F and 7% HF) for 5 min at ambient. Following this, the sample underwent DI wash and N2 spray, and the Ag DNFs are ready as a scaffold for the next process. In the second step of GRR, the Si-based Ag DNFs were immersed into a 0.5 mM chloroplatinic acid (H2PtCl6) electrolyte for 5 min in ambient atmosphere for Pt deposition. The prepared samples were then immersed in 30% NH4OH for 1 h to remove AgCl precipitate [34]. After DI wash and dehydration bake at 105°C for another 5 min, the Pt-Ag tDNFs were ready for experiment. We also prepared a sample by sputtering 7 nm of Pt on one-step GRR-prepared Ag DNFs, which is denoted as S-Pt/Ag DNFs, for comparison.Figure 1


A facile approach to prepare silicon-based Pt-Ag tubular dendritic nano-forests (tDNFs) for solar-light-enhanced methanol oxidation reaction.

Lin CT, Shiao MH, Chang MN, Chu N, Chen YW, Peng YH, Liao BH, Huang HJ, Hsiao CN, Tseng FG - Nanoscale Res Lett (2015)

The schematic drawing of the two-step GRR process.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385142&req=5

Fig1: The schematic drawing of the two-step GRR process.
Mentions: A two-step-GRR is proposed to prepare the Si-based Pt-Ag tDNFs as shown in Figure 1. In the first step of GRR, a fluoride-assisted GRR (FAGRR) [30] was adopted to prepare the Ag dendritic nanoforests (Ag DNFs) on planar silicon. In a typical process, n-type silicon (2 cm × 2 cm) was dipped into 2.5 mM silver nitride (AgNO3) + 25% (v/v) buffered oxide etchant (BOE) (comprising 34% NH4F and 7% HF) for 5 min at ambient. Following this, the sample underwent DI wash and N2 spray, and the Ag DNFs are ready as a scaffold for the next process. In the second step of GRR, the Si-based Ag DNFs were immersed into a 0.5 mM chloroplatinic acid (H2PtCl6) electrolyte for 5 min in ambient atmosphere for Pt deposition. The prepared samples were then immersed in 30% NH4OH for 1 h to remove AgCl precipitate [34]. After DI wash and dehydration bake at 105°C for another 5 min, the Pt-Ag tDNFs were ready for experiment. We also prepared a sample by sputtering 7 nm of Pt on one-step GRR-prepared Ag DNFs, which is denoted as S-Pt/Ag DNFs, for comparison.Figure 1

Bottom Line: In the first GRR, a homogeneous layer of silver dendritic nano-forests (DNFs) with 10 μm in thickness was grown on Si wafer in 5 min in silver nitride (AgNO3) and buffer oxide etchant (BOE) solution.In the second GRR, we utilized chloroplatinic acid (H2PtCl6) as the precursor for platinum (Pt) deposition to further transform the prepared Ag DNFs into Pt-Ag tDNFs.Current results provide a cost-effective and facile approach to prepare solar-driven metallic electrodes potentially applicable to photo-electro-chemical fuel cells.

View Article: PubMed Central - PubMed

Affiliation: Instrument Technology Research Center, National Applied Research Laboratories, Hsinchu, 300 Taiwan ; Department of Engineering and System Science, National Tsing Hua University, Hsinchu, 300 Taiwan.

ABSTRACT
In this paper, a facile two-step Galvanic replacement reaction (GRR) is proposed to prepare Pt-Ag tubular dendritic nano-forests (tDNFs) in ambient condition for enhancing methanol oxidation reaction (MOR) under solar illumination. In the first GRR, a homogeneous layer of silver dendritic nano-forests (DNFs) with 10 μm in thickness was grown on Si wafer in 5 min in silver nitride (AgNO3) and buffer oxide etchant (BOE) solution. In the second GRR, we utilized chloroplatinic acid (H2PtCl6) as the precursor for platinum (Pt) deposition to further transform the prepared Ag DNFs into Pt-Ag tDNFs. The catalytic performance and solar response of the Pt-Ag tDNFs toward methanol electro-oxidation are also studied by cyclic voltammetry (CV) and chronoamperometry (CA). The methanol oxidation current was boosted by 6.4% under solar illumination on the Pt-Ag tDNFs due to the induced localized surface plasmon resonance (LSPR) on the dendritic structure. Current results provide a cost-effective and facile approach to prepare solar-driven metallic electrodes potentially applicable to photo-electro-chemical fuel cells.

No MeSH data available.


Related in: MedlinePlus