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

被引：94

作者：

Han, Kai ^{[1
]}

Kreuger, Tomas ^{[1
]}

Mei, Bastian ^{[1
]}

Mul, Guido ^{[1
]}

机构：

[1] Univ Twente, Fac Sci & Technol, MESA Inst Nanotechnol, Photocatalyt Synth Grp, Meander 229,POB 217, NL-7500 AE Enschede, Netherlands

来源：

ACS CATALYSIS | 2017年 / 7卷 / 03期

关键词：

solar water splitting; SrTiO3; Ni@NiOx co-catalysts; transient behavior; regeneration; NICKEL METAL; COCATALYSTS; EVOLUTION; FACETS; OXIDE;

D O I：

10.1021/acscatal.6b03662

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 (H-2:O-2 >> 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.

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收藏

页码：1610 / 1614

页数：5

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