p‐Type InP Nanopillar Photocathodes for Efficient Solar‐Driven Hydrogen Production

Lee, Min Hyung; Takei, Kuniharu; Kapadia, Rehan; Zheng, Maxwell; Nah, Junghyo; Matthews, Tyler S.; Chueh, Yu‐Lun; Ager, Joel W.; Javey, Ali

doi:10.1002/ange.201203174

Cited by 61 publications

(84 citation statements)

References 31 publications

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“…Atomic layer deposition (ALD) has been used to form conformal coatings in high surface area structures, including water oxidation photoelectrodes. 43,[46][47][48][49] However, this process requires a low pressure environment and suitable precursor molecules for growth of the desired materials. 50 In contrast, the nitrogen flow assisted electrostatic spray pyrolysis process developed here operates at atmospheric pressure with a simpler precursor chemistry.…”

Section: Resultsmentioning

confidence: 99%

Undoped and Ni-Doped CoO_x Surface Modification of Porous BiVO₄ Photoelectrodes for Water Oxidation

et al. 2016

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ABSTRACT:Surface modification of photoanodes with oxygen evolution reaction (OER) catalysts is an effective approach to enhance water oxidation kinetics, to reduce external bias, and to improve the energy harvesting efficiency of photoelectrochemical (PEC) water oxidation. Here, the surface of porous BiVO4 photoanodes was modified by the deposition of undoped and Ni-doped CoOx via nitrogen flow assisted electrostatic spray pyrolysis. This newly developed atmospheric pressure deposition technique allows for surface coverage throughout the porous structure with thickness and composition control. PEC testing of modified BiVO4 photoanodes show that after deposition of an undoped CoOx surface layer, the onset potential shifts negatively by ca. 420 mV and the photocurrent density reaches 2.01 mA·cm -2 at 1.23 vs. VRHE under AM 1.5G illumination.Modification with Ni-doped CoOx produces even more effective OER catalysis and yields a photocurrent density of 2.62 mA·cm -2 at 1.23 VRHE under AM 1.5G illumination. The valence band X-ray photoelectron spectroscopy and synchrotron-based X-ray absorption spectroscopy results show the Ni doping reduces the Fermi level of the CoOx layer; the increased surface band bending produced by this effect is partially responsible for the superior PEC performance.3

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Section: Resultsmentioning

confidence: 99%

Undoped and Ni-Doped CoO_x Surface Modification of Porous BiVO₄ Photoelectrodes for Water Oxidation

et al. 2016

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“…A superficial treatment could improve the device's stability, but the implemented PEC would only reach few hundreds of hours of lifetime. Although the absorber protection realized through deposition of a passivation layer is an active research field [74,75], the ultimate approach would be the use of stable and earth-abundant materials.…”

Section: Plasmon-enhanced Water Splittingmentioning

confidence: 99%

Solar-Powered Plasmon-Enhanced Heterogeneous Catalysis

et al. 2016

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Photocatalysis uses semiconductors to convert sunlight into chemical energy. Recent reports have shown that plasmonic nanostructures can be used to extend semiconductor light absorption or to drive direct photocatalysis with visible light at their surface. In this review, we discuss the fundamental decay pathway of localized surface plasmons in the context of driving solar-powered chemical reactions. We also review different nanophotonic approaches demonstrated for increasing solar-tohydrogen conversion in photoelectrochemical water splitting, including experimental observations of enhanced reaction selectivity for reactions occurring at the metalsemiconductor interface. The enhanced reaction selectivity is highly dependent on the morphology, electronic properties, and spatial arrangement of composite nanostructures and their elements. In addition, we report on the particular features of photocatalytic reactions evolving at plasmonic metal surfaces and discuss the possibility of manipulating the reaction selectivity through the activation of targeted molecular bonds. Finally, using solar-tohydrogen conversion techniques as an example, we quantify the efficacy metrics achievable in plasmon-driven photoelectrochemical systems and highlight some of the new directions that could lead to the practical implementation of solar-powered plasmon-based catalytic devices.

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“…In the case of the photoanode, self-oxidation makes it difficult to utilize non-oxide materials. In contrast, the photocathode can be made of a non-oxide material, such as p-type Si [16][17][18][19], copper oxide [20,21], phosphides [22][23][24][25], and oxysulfides [26,27]. Most photocathodes showing a relatively high half-cell solar-to-hydrogen conversion efficiency (HC-STH) [28] have been composed of single-crystalline materials, as in the cases of Si, InP, and InGaP2, owing to their low defect densities; however, these electrodes require time-consuming and costly processes to fabricate.…”

Section: Introductionmentioning

confidence: 99%

Chalcopyrite Thin Film Materials for Photoelectrochemical Hydrogen Evolution from Water under Sunlight

2015

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Abstract:Copper chalcopyrite is a promising candidate for a photocathode material for photoelectrochemical (PEC) water splitting because of its high half-cell solar-to-hydrogen conversion efficiency (HC-STH), relatively simple and low-cost preparation process, and chemical stability. This paper reviews recent advances in copper chalcopyrite photocathodes. The PEC properties of copper chalcopyrite photocathodes have improved fairly rapidly: HC-STH values of 0.25% and 8.5% in 2012 and 2015, respectively. On the other hand, the onset potential remains insufficient, owing to the shallow valence band maximum mainly consisting of Cu 3d orbitals. In order to improve the onset potential, we explored substituting Cu for Ag and investigate the PEC properties of silver gallium selenide (AGSe) thin film photocathodes for varying compositions, film growth atmospheres, and surfaces. The modified AGSe photocathodes showed a higher onset potential than copper chalcopyrite photocathodes. It was demonstrated that element substitution of copper chalcopyrite can help to achieve more efficient PEC water splitting.

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p‐Type InP Nanopillar Photocathodes for Efficient Solar‐Driven Hydrogen Production

Cited by 61 publications

References 31 publications

Undoped and Ni-Doped CoO_x Surface Modification of Porous BiVO₄ Photoelectrodes for Water Oxidation

Undoped and Ni-Doped CoO_x Surface Modification of Porous BiVO₄ Photoelectrodes for Water Oxidation

Solar-Powered Plasmon-Enhanced Heterogeneous Catalysis

Chalcopyrite Thin Film Materials for Photoelectrochemical Hydrogen Evolution from Water under Sunlight

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p‐Type InP Nanopillar Photocathodes for Efficient Solar‐Driven Hydrogen Production

Cited by 61 publications

References 31 publications

Undoped and Ni-Doped CoOx Surface Modification of Porous BiVO4 Photoelectrodes for Water Oxidation

Undoped and Ni-Doped CoOx Surface Modification of Porous BiVO4 Photoelectrodes for Water Oxidation

Solar-Powered Plasmon-Enhanced Heterogeneous Catalysis

Chalcopyrite Thin Film Materials for Photoelectrochemical Hydrogen Evolution from Water under Sunlight

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Product

Resources

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Undoped and Ni-Doped CoO_x Surface Modification of Porous BiVO₄ Photoelectrodes for Water Oxidation

Undoped and Ni-Doped CoO_x Surface Modification of Porous BiVO₄ Photoelectrodes for Water Oxidation