Conformal SnO<sub>x</sub> heterojunction coatings for stabilized photoelectrochemical water oxidation using arrays of silicon microcones

Moreno-Hernandez, Ivan A.; Yalamanchili, Sisir; Fu, Harold J.; Atwater, Harry A.; Brunschwig, Bruce S.; Lewis, Nathan S.

doi:10.1039/d0ta01144d

Cited by 14 publications

(11 citation statements)

References 42 publications

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“…32,34 Combining the GaInP photocathode with protected Si photoanodes that exhibit a maximum photovoltage of 0.6 V would consequently constitute a promising route to the formation of stable unassisted tandem PEC-based water-splitting structures. 9,10,66 GaInP photocathodes also could provide improved durability for long-term production of hydrogen in alkaline electrolytes than in acidic electrolytes owing to the negligible solubility of the surface oxide at pH 14. Consequently, creating a buried homojunction and operating it under these pH conditions may be an effective strategy to overcome the performance degradation caused by the emergence of the surficial InO x layer while retaining stable light-limited photocurrent densities and slow dissolution rates of the p-GaInP photoelectrode material.…”

Section: Discussionmentioning

confidence: 99%

Understanding the Stability of Etched or Platinized p-GaInP Photocathodes for Solar-Driven H₂ Evolution

Young

Deutsch

et al. 2021

ACS Appl. Mater. Interfaces

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The long-term stability in acidic or alkaline aqueous electrolytes of p-Ga 0.52 In 0.48 P photocathodes, with a band gap of ∼1.8 eV, for the solardriven hydrogen-evolution reaction (HER) has been evaluated from a thermodynamic, kinetic, and mechanistic perspective. At either pH 0 or pH 14, etched p-GaInP electrodes corroded cathodically under illumination and formed metallic In 0 on the photoelectrode surface. In contrast, under the same conditions, electrodeposition of Pt facilitated the HER kinetics and stabilized p-GaInP/Pt photoelectrodes against such cathodic decomposition. When held at 0 V versus the reversible hydrogen electrode, p-GaInP/Pt electrodes in either pH = 0 or pH = 14 exhibited stable current densities (J) of ∼−9 mA cm −2 for hundreds of hours under simulated 1 sun illumination. During the stability tests, the current density−potential (J−E) characteristics of the p-GaInP/Pt photoelectrodes degraded due to pH-dependent changes in the surface chemistry of the photocathode. This work provides a fundamental understanding of the stability and corrosion mechanisms of p-GaInP photocathodes that constitute a promising top light absorber for tandem solar-fuel generators.

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Section: Discussionmentioning

confidence: 99%

Understanding the Stability of Etched or Platinized p-GaInP Photocathodes for Solar-Driven H₂ Evolution

Young

Deutsch

et al. 2021

ACS Appl. Mater. Interfaces

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“…[13] These peaks confirm the presence of SnO x . The O 1s peak in Figure 1f can be divided into two fitted peaks at 532.1 eV and 530.9 eV and are assigned to the oxide [14] and surface hydroxyls [15] respectively, confirming the hydrated feature of the SnO x layer.…”

Section: Resultsmentioning

confidence: 71%

Oxygen‐Insensitive Peroxide Reduction Catalysts for Reliable Electrochemical Bioassays

Ding

Wang

Chen

et al. 2022

Adv Materials Inter

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Coupling the oxidase enzymatic and H2O2 cathodic reactions is an ideal approach for accurate bioassays development because it naturally avoids most endogenous/exogenous electroactive interferents in biofluids. However, the accompanying oxygen cathodic reaction at the surface of commonly used stable catalysts compromises the bioassay accuracy, thus limiting practical application of this detection principle. Here, highly active oxygen‐insensitive electrocatalysts for H2O2 reduction by modifying noble metals (Pt, Au) with an ultra‐thin tin oxide layer that can selectively block the diffusion of oxygen from the electrolyte to the noble metal surface, are reported. This empowers the electrocatalysts with enhanced resistance to current interference from oxygen reduction reaction, thus enabling highly selective sensing of sarcosine, a model analyte (a biomarker for prostate cancer), in the presence of various electroactive interferences. This work highlights the importance of H2O2 cathodic reactions in accurate biomarker detection and their advanced applications in life science, including developing reliable biomarker assays.

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“…Typically, most stable materials (like TiO 2 or ZnO) have large bandgap and hence have lesser optical absorption crosssection and materials like CdS that have greater optical absorption cross-section due to lesser bandgap suffer from photocorrosion. Improving the stability of the photoelectrodes via conformal coatings with optimal transparency and catalytic properties (Moreno-Hernandez et al, 2020) via a coating techniques that are scalable and inexpensive should be explored. The second contra-varying property of photopotential and photocurrent is also due to the issues of bandgap.…”

Section: Contra-varying Properties In Pec-oer Ec-oer and C-lib And Its Consequencesmentioning

confidence: 99%

“…The deeper (higher) the energy level of the photo-generated hole (electron) in the valence (conduction) band, greater is the driving photooxidation (photoreduction) (Gratzel, 2001;Valdes et al, 2008;Mayer, 2017). The difference between these hole and electron levels provides a measure of photopotential (Gratzel, 2001;Mayer, 2017;Moreno-Hernandez et al, 2020). Typically, materials that generate greater photopotential have higher band-gap and hence absorb lesser photons, leading to lesser photocurrents.…”

Section: Contra-varying Properties In Pec-oer Ec-oer and C-lib And Its Consequencesmentioning

confidence: 99%

Should All Electrochemical Energy Materials Be Isomaterially Heterostructured to Optimize Contra and Co-varying Physicochemical Properties?

Pala

2020

Front. Chem.

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Sustainable energy and chemical/material transformation constrained by limited greenhouse gas generation impose a grand challenge and posit outstanding opportunities to electrochemical material devices. Dramatic advancements in experimental and computational methodologies have captured detailed insights into the working of these material devices at a molecular scale and have brought to light some fundamental constraints that impose bounds on efficiency. We propose that the coupling of molecular events in the material device gives rise to contra-varying or co-varying properties and efficiency improving partial decoupling of such properties can be achieved via introducing engineered heterogeneities. A specific class of engineered heterogeneity is in the form of isomaterial heterostructures comprised of non-native and native polymorphs. The non-native polymorph differs from their native/ground state bulk polymorph in terms of its discrete translational symmetry and we anticipate specific symmetry relationships exist between non-native and native structures that enable the formation of interfaces that enhance efficiency. We present circumstantial evidence and provide speculative mechanisms for such an approach with the hope that a more comprehensive delineation of proposed material design will be undertaken.

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Conformal SnO_x heterojunction coatings for stabilized photoelectrochemical water oxidation using arrays of silicon microcones

Abstract: A protective tin oxide layer formed by atomic-layer deposition limits surface recombination at n-Si surfaces and produces ∼620 mV of photovoltage on planar n-Si photoanodes. The layer conformally coats structures such as Si microcone arrays.

Cited by 14 publications

References 42 publications

Understanding the Stability of Etched or Platinized p-GaInP Photocathodes for Solar-Driven H₂ Evolution

Understanding the Stability of Etched or Platinized p-GaInP Photocathodes for Solar-Driven H₂ Evolution

Oxygen‐Insensitive Peroxide Reduction Catalysts for Reliable Electrochemical Bioassays

Should All Electrochemical Energy Materials Be Isomaterially Heterostructured to Optimize Contra and Co-varying Physicochemical Properties?

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Conformal SnOx heterojunction coatings for stabilized photoelectrochemical water oxidation using arrays of silicon microcones

Abstract: A protective tin oxide layer formed by atomic-layer deposition limits surface recombination at n-Si surfaces and produces ∼620 mV of photovoltage on planar n-Si photoanodes. The layer conformally coats structures such as Si microcone arrays.

Cited by 14 publications

References 42 publications

Understanding the Stability of Etched or Platinized p-GaInP Photocathodes for Solar-Driven H2 Evolution

Understanding the Stability of Etched or Platinized p-GaInP Photocathodes for Solar-Driven H2 Evolution

Oxygen‐Insensitive Peroxide Reduction Catalysts for Reliable Electrochemical Bioassays

Should All Electrochemical Energy Materials Be Isomaterially Heterostructured to Optimize Contra and Co-varying Physicochemical Properties?

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Resources

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Conformal SnO_x heterojunction coatings for stabilized photoelectrochemical water oxidation using arrays of silicon microcones

Understanding the Stability of Etched or Platinized p-GaInP Photocathodes for Solar-Driven H₂ Evolution

Understanding the Stability of Etched or Platinized p-GaInP Photocathodes for Solar-Driven H₂ Evolution