ATR-SEIRAS 研究在光照下 GaN 光催化剂上 Pt 共催化剂的费米能级对析氢反应的影响。
ATR-SEIRAS investigation of the Fermi level of Pt cocatalyst on a GaN photocatalyst for hydrogen evolution under irradiation.
机构信息
Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
出版信息
J Am Chem Soc. 2009 Sep 23;131(37):13218-9. doi: 10.1021/ja904991p.
The interaction of photogenerated carries in GaN photocatalyst with Pt cocatalyst for hydrogen evolution under irradiation was investigated from in situ ATR-SEIRAS measurement by following the CO vibrational frequency. After irradiation, the CO frequency shifted higher, indicating that the Fermi level of Pt particles was positively shifted by the photogenerated holes. Thereafter, a lower frequency peak appeared, indicating that the Fermi level of some Pt particles was negatively shifted to the hydrogen evolution potential by photogenerated electrons, which is the essential function of cocatalysis for hydrogen evolution.
采用原位衰减全反射表面增强红外吸收光谱（ATR-SEIRAS）技术，通过跟踪 CO 的振动频率，研究了 GaN 光催化剂中光生载流子与 Pt 助催化剂在光照下进行析氢反应的相互作用。光照后，CO 的振动频率向高频移动，表明 Pt 颗粒的费米能级被光生空穴正移。此后，出现了一个较低频率的峰，表明部分 Pt 颗粒的费米能级被光生电子负移至析氢电位，这是析氢助催化的基本功能。
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