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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.


Related in: MedlinePlus

The SEM images and EDS result of Ag DNFs. (a-d) The SEM images of typical Ag DNFs grown on plane silicon in 2.5 mM AgNO3 and 25% (v/v) buffered oxide etchant (BOE) for 300 s. (e) The EDS result of the Ag DNFs shown in (a).
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Fig2: The SEM images and EDS result of Ag DNFs. (a-d) The SEM images of typical Ag DNFs grown on plane silicon in 2.5 mM AgNO3 and 25% (v/v) buffered oxide etchant (BOE) for 300 s. (e) The EDS result of the Ag DNFs shown in (a).

Mentions: The SEM images shown from Figure 2a,b,c,d demonstrate the typical Ag DNFs on silicon substrate obtained by the first GRR. A 10-μm-thick Ag DNF layer was homogeneously formed on a plain silicon substrate within 5 min. It is found that oxygen signal was not detected in the as-prepared Ag DNFs in the EDS analysis (Figure 2e). This indicates our process is not favored for the formation of silver oxide. The growing process of Ag DNFs is schematically depicted in Figure 3. In the early stage of the reaction, Ag nano-islands dominated the surface of Si (Figure 3a). The dendritic structures started to appear after 40 s of the FAGRR and finally extended to the whole surface of Si (Figure 3b,c,d,e,f). The cross-section views (Figure 3g,h,i) demonstrate that the thickness of the Ag DNFs layer could reach 10 μm in 5 min and 20 μm in 8 min, respectively, which has not been reported in the previous studies on silicon-based silver dendrites [27-29]. The 10-μm-thick Ag DNFs (Figure 3i) were selected for the following experiments.Figure 2


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 SEM images and EDS result of Ag DNFs. (a-d) The SEM images of typical Ag DNFs grown on plane silicon in 2.5 mM AgNO3 and 25% (v/v) buffered oxide etchant (BOE) for 300 s. (e) The EDS result of the Ag DNFs shown in (a).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
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getmorefigures.php?uid=PMC4385142&req=5

Fig2: The SEM images and EDS result of Ag DNFs. (a-d) The SEM images of typical Ag DNFs grown on plane silicon in 2.5 mM AgNO3 and 25% (v/v) buffered oxide etchant (BOE) for 300 s. (e) The EDS result of the Ag DNFs shown in (a).
Mentions: The SEM images shown from Figure 2a,b,c,d demonstrate the typical Ag DNFs on silicon substrate obtained by the first GRR. A 10-μm-thick Ag DNF layer was homogeneously formed on a plain silicon substrate within 5 min. It is found that oxygen signal was not detected in the as-prepared Ag DNFs in the EDS analysis (Figure 2e). This indicates our process is not favored for the formation of silver oxide. The growing process of Ag DNFs is schematically depicted in Figure 3. In the early stage of the reaction, Ag nano-islands dominated the surface of Si (Figure 3a). The dendritic structures started to appear after 40 s of the FAGRR and finally extended to the whole surface of Si (Figure 3b,c,d,e,f). The cross-section views (Figure 3g,h,i) demonstrate that the thickness of the Ag DNFs layer could reach 10 μm in 5 min and 20 μm in 8 min, respectively, which has not been reported in the previous studies on silicon-based silver dendrites [27-29]. The 10-μm-thick Ag DNFs (Figure 3i) were selected for the following experiments.Figure 2

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