Facet-specific heterojunction in gold-decorated pyramidal silicon for electrochemical hydrogen peroxide sensing

Huang, Chia-Wei; Valinton, Joey Andrew A.; Hung, Yung‐Jr; Chen, Chun‐Hu

doi:10.1016/j.snb.2018.03.131

Cited by 18 publications

(8 citation statements)

References 54 publications

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“…To achieve a series of edge exposure in a controllable manner at finer scales, we conducted a facile photoresist‐mask deposition of CMOH on pyramid‐textured substrates. Micron‐scale pyramidal features on Si wafer, widely used in solar cell industry as antireflective layers, can be easily adopted and scaled up by anisotropic alkaline etching on commercial Si (100) wafers . In addition, 3D features facilitate oxygen elimination, which is desired to decouple its correlation with overall performance for a fair comparison of turnover frequency .…”

Section: Resultsmentioning

confidence: 99%

Discontinuity‐Enhanced Thin Film Electrocatalytic Oxygen Evolution

Shih

Jhang

Tsai

et al. 2019

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splitting, low-cost and facile fabrication of electrocatalysts, active for oxygen evolution reaction (OER) without involving precious metals (e.g., Ru and Ir), is therefore the central interests. [8,9] General approaches and knowledge capable of enhancing atom-efficiency in OER are also essential to conserve all the elements used in electrocatalysts regardless the individual nature abundance.As compared to colloidal electrocatalysts, scalable thin film electrocatalysts have been recognized by rapid mass transfer and robust adhesion with electrodes against peeling of electrocatalytic materials during oxygen bubbling, essential to achieve durable water splitting, high power output, and commercial demand of coating on various substrates. [10] The previous OER studies have concentrated on exploring continuous, void-free thin films of Ni, Co, Fe, and Mn oxides in alkaline conditions, [5,[10][11][12][13][14][15][16][17][18][19] revealing the important electrocatalytic influence regarding crystal structures, synergistic behaviors between elements, catalytic roles of active species, alternation of orbitals and electron transfer, and deposition methodologies. As electrocatalytic OER requires electricity (anodic current) and mass transport of reactants (water/OH − ) and product (O 2 ) at catalytic sites to proceed, this so-called "triple-phase boundary region," [20] usually at the heterojunction edges, is anticipated to deliver the best OER activities. By dividing a continuous thin film into fractured, discontinuous pieces (as a concept of "thin film imperfection"), the additionally exposed edge sites can thus greatly improve OER performance and atom efficiency. Recent designs of single atom catalysts may further support this idea. [21,22] In fact, strong edge effects on improving hydrogen evolution reaction (the other half reaction in water splitting) have been well recognized. [23,24] However, this concept of edge exposure in thin film has received much less attentions possibly due to the investigation complexity and coverage uncertainty of discontinuous deposition. With the example of photolithography-patterned electrocatalysts toward improved OER, [25] correlation of OER performance to systematic edge exposure normalizing to unit area is then becoming the most desired information. Recent study on the edge-site atom population of discrete, atom-scale deposition of iron oxides shows a proportional relationship to OER activities. [26] Despite the emerging of edge-dependent OER, reliable deposition over large area with versatile coverage/continuity to achieve Thin film electrocatalysts allow strong binding and intimate electrical contact with electrodes, rapid mass transfer during reaction, and are generally more durable than powder electrocatalysts, which is particularly beneficial for gas evolution reactions. In this work, using cobalt manganese oxyhydroxide, an oxygen evolution reaction (OER) electrocatalyst that can be grown directly on various electrodes as a model system, it is demonstrated that breaking a continuous...

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Section: Resultsmentioning

confidence: 99%

Discontinuity‐Enhanced Thin Film Electrocatalytic Oxygen Evolution

Shih

Jhang

Tsai

et al. 2019

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“…At pH=7.4, the Au/Si array demonstrated the best activity and a wide temperature range from 15 to 70 °C. Further, facet‐dependent electrochemical activity was confirmed by Chen et al, and the detection performance of Au/Si (111) heterojunction is superior to Au/Si (100) . Thus, well‐controlled facets can be beneficial for electrocatalyst design, as a supplement to facilitating electron transport.…”

Section: Free‐standing 3d Electrodesmentioning

confidence: 90%

“…Further, facet-dependent electrochemical activity was confirmed by Chen et al, and the detection performance of Au/Si (111) heterojunction is superior to Au/Si (100). [143] Thus, well-controlled facets can be beneficial for electrocatalyst design, as a supplement to facilitating electron transport. Silicon nanowires have huge surface-to-volume ratios, excellent electronic/mechanical properties, favorable biocompatibility, surface tailorability, multifunctionality.…”

Section: Carbon and Silicon Based Free-standing 3d Electrodesmentioning

confidence: 99%

Free‐Standing 3D Electrodes for Electrochemical Detection of Hydrogen Peroxide

et al. 2019

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Electrochemical detection of hydrogen peroxide has achieved rapid development, due to the wide presence in industrial production, everyday life, bioprocess and green energy chemistry, etc. Many three‐dimensional structures have emerged as state‐of‐the‐art electrocatalysts due to their fascinating structures and electrochemical properties. This review summarizes free‐standing three‐dimensional electrocatalysts based on metal, metal oxide, carbon & silicon, and unconventional materials for detection of hydrogen peroxide with low limit of detection, wide range and fast response. The work also highlights their applications in near neutral conditions, especially their ability for single cell detection and mapping in biological environment. Further exploration into these materials together with devices design will facilitate the development of next‐generation detection technologies toward in situ and real‐time detection and contribute to wearable/portable smart detection electronics.

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“…For electrochemical H 2 O 2 sensor based on Si/noble metal composite nanostructures, a concerted research effort has been made in the last decade [33][34][35][36][37][38][39][40][41]. MACE-SiNW is a highly compatible framework for integration of noble metal particles, the latter dictating the H 2 O 2 sensing through catalytic reduction process.…”

Section: Introductionmentioning

confidence: 99%

Boosting the Dynamic Range for Electrochemical Sensing of Hydrogen Peroxide by Enhanced Integration of Pd Nanoparticles in 3D Porous Si Framework

2020

Electroanalysis

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Three‐dimensional porous silicon framework (3D‐pSi) integrated with various nanostructures is highly potential for functional devices usage such as micro fuel cells or sensing chips. For noble metal deposition in highly directional Si nanowire array or porous Si with large aspect ratios, one difficulty is the restriction on the depth of deposition available. Herein, we would like to introduce a facile route to enhance the integration of Pd nanoparticles with anisotropic Si porous structure. By converting Si nanowire array into 3D‐pSi, the surface coverage of Pd nanoparticles is effectively improved as shown by scanning electron micrographs and cross‐sectional element mapping data. The relative electrochemical active surface area is increased by 3.5 folds. In order to demonstrate the merits brought by this morphological evolution, the electrochemical sensing devices are prepared for detecting H2O2 in PBS solution. As shown by differential pulse voltammetry, the upper limit of linear range of detection can be raised from 6.30 mM to 14.95 mM. This approach may indicate an alternative for boosting the performance of future sensing chips with progressively limited die area, especially attractive for those scenarios where large dynamic range is favourable.

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Facet-specific heterojunction in gold-decorated pyramidal silicon for electrochemical hydrogen peroxide sensing

Cited by 18 publications

References 54 publications

Discontinuity‐Enhanced Thin Film Electrocatalytic Oxygen Evolution

Discontinuity‐Enhanced Thin Film Electrocatalytic Oxygen Evolution

Free‐Standing 3D Electrodes for Electrochemical Detection of Hydrogen Peroxide

Boosting the Dynamic Range for Electrochemical Sensing of Hydrogen Peroxide by Enhanced Integration of Pd Nanoparticles in 3D Porous Si Framework

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