Hydrogen Evolution from Water Based on Plasmon-Induced Charge Separation at a TiO2/Au/NiO/Pt System
Hydrogen Evolution from Water Based on Plasmon-Induced Charge Separation at a TiO2/Au/NiO/Pt System
复制标题
基于 TiO2/Au/NiO/Pt 系统中等离激元诱导电荷分离的水析氢
DOI：
10.1039/c7cp06527b
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
and T. Tatsuma
中科院分区：
文献类型：
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作者：
K.-C. Kao;Y. Kuroiwa;H. Nishi;and T. Tatsuma
金属-半导体等离子体纳米结构能够通过等离子体诱导的电荷分离（PICS）转换光能，为在包括太阳能在内的各个领域利用太阳能提供了富有成效的新策略。在这里，我们通过在TiO 2/Au上涂覆p型NiO层，在该层上沉积Pt助催化剂，来增强在与TiO 2/Au光阳极耦合的Pt阴极处从水中析氢的PICS效率。可见光下，PICS发生在Au-TiO 2界面。从Au纳米颗粒注入到TiO 2中的电子被传输到Pt阴极并引起从水中析氢，其作用光谱与Au纳米颗粒的等离子体消光光谱相匹配。NiO层从Au纳米颗粒提取分离的正电荷，积累电荷并驱动甲醇在具有正电荷的NiO上的Pt助催化剂处氧化。由于引入了Pt改性的NiO层，零偏置电压下甲醇氧化和伴随的氢析出速率提高了0.3.5倍。NiO层还可以保护Au纳米颗粒免于自氧化。
Metal-semiconductor plasmonic nanostructures are capable of converting light energy through plasmon-induced charge separation (PICS), providing fruitful new strategies to utilize solar energy in various fields, including photocatalysis. Here, we enhance the PICS efficiencies for hydrogen evolution from water at a Pt cathode coupled with a TiO2/Au photoanode by coating the TiO2/Au with a p-type NiO layer on which a Pt co-catalyst is deposited. PICS occurs at the Au–TiO2 interface under visible light. The electrons injected from the Au nanoparticles into TiO2 are transported to the Pt cathode and cause hydrogen evolution from water, the action spectrum of which matches the plasmonic extinction spectrum of the Au nanoparticles. The NiO layer extracts the separated positive charges from the Au nanoparticles, accumulates the charges and drives methanol oxidation at the Pt co-catalyst on NiO with the positive charges. As a result of the introduction of the Pt-modified NiO layer, the rates of methanol oxidation and accompanying hydrogen evolution at zero bias voltage were improved by ∼3.5 times. The NiO layer may also protect the Au nanoparticles from self-oxidation.