In Situ Loading Transition Metal Oxide Clusters on TiO2 Nanosheets As Co-catalysts for Exceptional High Photoactivity
In Situ Loading Transition Metal Oxide Clusters on TiO2 Nanosheets As Co-catalysts for Exceptional High Photoactivity
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在 TiO2 纳米片上原位负载过渡金属氧化物簇作为具有极高光活性的助催化剂
DOI：
10.1021/cs4002755
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发表时间：
2013-09-01
期刊：
影响因子：
12.9
通讯作者：
Dong, Lin
中科院分区：
文献类型：
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作者：
Liu, Lichen;Ji, Zeyang;Dong, Lin
在本工作中，通过一锅法将过渡金属氧化物簇合物(MnOx、FeOx、CoOx、NiOx和CuOx，记为Tm-TiOx)原位负载到二氧化钛纳米片上。结构和孔结构表征表明，金属离子没有掺杂到二氧化钛纳米片的骨架中。透射电子显微镜和扫描电子显微镜分析表明，∼纳米片上分散着尺寸为2 nm的团簇。光致发光光谱和光电化学测量表明，这些金属氧化物团簇可以作为空穴陷阱。时间分辨光谱分析表明，Tm-TiO2光催化剂的电荷转移过程明显加快，电荷分离效率提高。与传统浸渍法制备的RuO2/TiO2光催化剂和IrO2/TiO2光催化剂相比，金属氧化物纳米片(Ru-TiO2IM)和Ir-TiO2光催化剂(Ir-TiO2IM)在光催化水氧化反应中表现出明显的促进作用。通过原位负载法制备了RuO2/TiO2光催化剂和Ir/TiO2光催化剂纳米片(分别记为Ru-TiO2光催化剂和Ir-TiO2光催化剂).
In this work, transition metal oxide clusters (MnOx, FeOx, CoOx, NiOx, and CuOx, denoted as TM-TiO2) are in situ loaded on TiO2 nanosheets through one-pot reaction. Structural and pore structural characterizations prove that metal ions do not dope into the frameworks of TiO2 nanosheets. Through TEM and STEM, we can determine that clusters with ∼2 nm size are finely dispersed on TiO2 nanosheets. PL spectra and photoelectrochemical measurements suggest that these metal oxide clusters can serve as hole traps. Time-resolved PL spectra demonstrate that the charge-transfer process in TM-TiO2 is significantly accelerated, leading to higher charge separation efficiency. Metal oxide clusters show significant promotion effect in photocatalytic water oxidation to O2 compared to RuO2/TiO2 and IrO2/TiO2 nanosheets (denoted as Ru-TiO2(IM) and Ir-TiO2(IM)) prepared through conventional impregnation method. We also prepared RuO2/TiO2 and Ir/TiO2 nanosheets (denoted as Ru-TiO2(HT) and Ir-TiO2(HT)) through the in situ load...