High Photocurrent in Silicon Photoanodes Catalyzed by Iron Oxide Thin Films for Water Oxidation

Jun, Kimin; Lee, Yun Seog; Buonassisi, Tonio; Jacobson, Joseph M.

doi:10.1002/anie.201104367

Cited by 79 publications

(62 citation statements)

References 34 publications

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“…[30] On the other hand, under light illumination and positive bias, the positive-charged inversion layer (induced by alkaline electrolyte) beneath the SiO x /Si interface can repel electrons into the Si substrate, reducing the charge recombination in the inversion Extensive efforts have been devoted to the development of clean and renewable energy sources because of the increasing energy demands and environmental issues. [11] To address this problem, a variety of metal and/or oxide coatings (e.g., doped SiO x , [12] transparent conductive oxides, [13] transition metals, and their oxides [9,[14][15][16][17][18][19][20][21][22][23] ) have been explored to protect Si photoanodes. [4,5] However, it is still a great challenge to develop effective techniques for the utilization of solar energy cheaply, conveniently, and efficiently.…”

Section: Doi: 101002/aenm201601805mentioning

confidence: 99%

NiFe Alloy Protected Silicon Photoanode for Efficient Water Splitting

Chen

et al. 2016

Advanced Energy Materials

132

117

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time-saving, ecofriendly, and controllable, avoiding the expensive and complicated ALD process. [22] The resulting np + -Si/ SiO x /NiFe photoanode exhibited an extremely large photovoltage of 620 mV, and a high solar-to-O 2 efficiency of 3.3%, a low onset potential of 0.89 V versus RHE (Reversible Hydrogen Electrode) for OER, and achieved a light-limited photocurrent density of 30.7 mA cm −2 at 1.23 V versus RHE in 1.0 m KOH electrolyte. To the best of our knowledge, the performance of np + -Si/SiO x /NiFe photoanode is much superior to those of the counterparts reported previously. The NiFe OEC/electrolyte interface has also been studied by introducing H 2 O 2 as a hole scavenger, revealing that the hole injection efficiency at NiFe/electrolyte interface is much higher than those at single metal (Fe or Ni)/electrolyte interfaces.The structure of np + -Si/SiO x /NiFe photoanode is schematically illustrated in Figure 1a.

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Section: Doi: 101002/aenm201601805mentioning

confidence: 99%

NiFe Alloy Protected Silicon Photoanode for Efficient Water Splitting

Chen

et al. 2016

Advanced Energy Materials

132

117

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“…For example for the Si/Fe 2 O 3 electrodes, Mayer et al have shown the reduction of photoanodic turn-on potential through the dual-absorber nature of the n-Si/n-Fe 2 O 3 junction [18], while Jun et al have reported the photoanodic onset potential decrease due to the catalytic effect of n-Fe 2 O 3 on n-Si [33]. Building full PEC systems based on nanowire (NW) heterojunction photoelectrodes is a promising approach for solar hydrogen production due to unique characteristics of NWs, facile NW fabrication methods, ability to form different NW heterostructures, etc.…”

Section: Introductionmentioning

confidence: 99%

Nanowire/nanotube array tandem cells for overall solar neutral water splitting

et al. 2016

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In this study, we report the fabrication and characterization of a novel PEC tandem cell, consisting of p-Si/TiO 2 /Fe 2 O 3 core/shell/hierarchical nanowire (csh-NW) array photocathode and TiO 2 /TiO 2 core/shell nanotube (cs-NT) array photoanode, for overall solar water splitting in a neutral pH water. The p-Si/n-TiO 2 /n-Fe 2 O 3 csh-NWs, made mainly by solution-processed methods, offer significantly improved performance in the neutral pH water with a low (positive) onset potential and photoactivity at zero bias, due to the increased reaction surface area, effective energy band alignment among p-Si, n-TiO 2 and n-Fe 2 O 3 enhancing the charge separation, improved optical absorption, and enhanced gas evolution. Nitrogen modification (annealing under N 2 ) is used to further enhance the csh-NWs photocathodic performance. The PEC tandem cell is then able to handle overall solar water splitting in the neutral pH water with a solar-to-hydrogen (STH) efficiency of $ 0.18%. The achieved results demonstrate initial steps toward the realization of full PEC devices using earth-abundant materials for solar hydrogen generation suggesting competitive performance when solar matched photoanode core material and co-catalysts are used.

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“…Si dominates the current solar cell market mainly because of the low cost in manufacturing highly pure and crystalline substrates [14]. However, when used as a photoanode, it faces critical challenges of corrosion by the electrolyte.…”

Section: Silicon (Si) Photoanodementioning

confidence: 99%

The Principle of Photoelectrochemical Water Splitting

Ma¹,

Wang²

2017

Nanomaterials for Energy Conversion and Storage

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Photoelectrochemical (PEC) water splitting has been attracted significant attention lately due to its utilization of solar energy and H2 production. The critical challenge in PEC research is the O2 evolution half reaction (OER) occurring on the photoanode. This chapter consists of an introduction of PEC system, the detailed process of OER, the development of several semiconductor photoanodes, OER mechanism, highefficient elelctrocatalysts and tandem cell based on PEC system. This chapter provides a review of the principles, research route and prospect of PEC and analysis of the microstructure, interface engineering and performance in some important samples. It will be a guide for the beginners in the PEC area.

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High Photocurrent in Silicon Photoanodes Catalyzed by Iron Oxide Thin Films for Water Oxidation

Cited by 79 publications

References 34 publications

NiFe Alloy Protected Silicon Photoanode for Efficient Water Splitting

NiFe Alloy Protected Silicon Photoanode for Efficient Water Splitting

Nanowire/nanotube array tandem cells for overall solar neutral water splitting

The Principle of Photoelectrochemical Water Splitting

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