Transient Behavior of Ni@NiOx Functionalized SrTiO3 in Overall Water Splitting

Kai Han; Tomas Kreuger; Bastian Mei; Guido Mul

doi:10.1021/acscatal.6b03662

Transient Behavior of Ni@NiO_x Functionalized SrTiO₃ in Overall Water Splitting

Kai Han, Tomas Kreuger, Bastian Mei, Guido Mul^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

Transients in the composition of Ni@NiO_x core-shell co-catalysts deposited on SrTiO₃ are discussed on the basis of state-of-the-art continuous analysis of photocatalytic water splitting, and post-XPS and TEM analyses. The formation of excessive hydrogen (H₂:O₂ ≫ 2) in the initial stages of illumination demonstrates oxidation of Ni(OH)₂ to NiOOH (nickel oxyhydroxide), with the latter catalyzing water oxidation. A disproportionation reaction of Ni and NiOOH, yielding Ni(OH)₂ with residual embedded Ni, occurs when illumination is discontinued, which explains repetitive transients in (excess) hydrogen and oxygen formation when illumination is reinitiated. (Chemical Equation Presented).

Original language	English
Pages (from-to)	1610-1614
Number of pages	5
Journal	ACS catalysis
Volume	7
Issue number	3
DOIs	https://doi.org/10.1021/acscatal.6b03662
Publication status	Published - 3 Mar 2017

Keywords

Ni@NiOx co-catalysts
Regeneration
Solar water splitting
SrTiO3
Transient behavior

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title = "Transient Behavior of Ni@NiOx Functionalized SrTiO3 in Overall Water Splitting",

abstract = "Transients in the composition of Ni@NiOx core-shell co-catalysts deposited on SrTiO3 are discussed on the basis of state-of-the-art continuous analysis of photocatalytic water splitting, and post-XPS and TEM analyses. The formation of excessive hydrogen (H2:O2 ≫ 2) in the initial stages of illumination demonstrates oxidation of Ni(OH)2 to NiOOH (nickel oxyhydroxide), with the latter catalyzing water oxidation. A disproportionation reaction of Ni and NiOOH, yielding Ni(OH)2 with residual embedded Ni, occurs when illumination is discontinued, which explains repetitive transients in (excess) hydrogen and oxygen formation when illumination is reinitiated. (Chemical Equation Presented).",

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author = "Kai Han and Tomas Kreuger and Bastian Mei and Guido Mul",

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TY - JOUR

T1 - Transient Behavior of Ni@NiOx Functionalized SrTiO3 in Overall Water Splitting

AU - Han, Kai

AU - Kreuger, Tomas

AU - Mei, Bastian

AU - Mul, Guido

PY - 2017/3/3

Y1 - 2017/3/3

N2 - Transients in the composition of Ni@NiOx core-shell co-catalysts deposited on SrTiO3 are discussed on the basis of state-of-the-art continuous analysis of photocatalytic water splitting, and post-XPS and TEM analyses. The formation of excessive hydrogen (H2:O2 ≫ 2) in the initial stages of illumination demonstrates oxidation of Ni(OH)2 to NiOOH (nickel oxyhydroxide), with the latter catalyzing water oxidation. A disproportionation reaction of Ni and NiOOH, yielding Ni(OH)2 with residual embedded Ni, occurs when illumination is discontinued, which explains repetitive transients in (excess) hydrogen and oxygen formation when illumination is reinitiated. (Chemical Equation Presented).

AB - Transients in the composition of Ni@NiOx core-shell co-catalysts deposited on SrTiO3 are discussed on the basis of state-of-the-art continuous analysis of photocatalytic water splitting, and post-XPS and TEM analyses. The formation of excessive hydrogen (H2:O2 ≫ 2) in the initial stages of illumination demonstrates oxidation of Ni(OH)2 to NiOOH (nickel oxyhydroxide), with the latter catalyzing water oxidation. A disproportionation reaction of Ni and NiOOH, yielding Ni(OH)2 with residual embedded Ni, occurs when illumination is discontinued, which explains repetitive transients in (excess) hydrogen and oxygen formation when illumination is reinitiated. (Chemical Equation Presented).

KW - Ni@NiOx co-catalysts

KW - Regeneration

KW - Solar water splitting

KW - SrTiO3

KW - Transient behavior

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JO - ACS catalysis

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ER -

Transient Behavior of Ni@NiO_x Functionalized SrTiO₃ in Overall Water Splitting

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