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Au Nanorod Photosensitized La2Ti2O7 Nanosteps: Successive Surface Heterojunctions Boosting Visible to Near-Infrared Photocatalytic H2 Evolution
ACS Catalysis ( IF 11.3 ) Pub Date : 2017-11-30 00:00:00 , DOI: 10.1021/acscatal.7b02972
Xiaoyan Cai 1, 2 , Mingshan Zhu 2 , Ossama A. Elbanna 2 , Mamoru Fujitsuka 2 , Sooyeon Kim 2 , Liang Mao 1 , Junying Zhang 1 , Tetsuro Majima 2
ACS Catalysis ( IF 11.3 ) Pub Date : 2017-11-30 00:00:00 , DOI: 10.1021/acscatal.7b02972
Xiaoyan Cai 1, 2 , Mingshan Zhu 2 , Ossama A. Elbanna 2 , Mamoru Fujitsuka 2 , Sooyeon Kim 2 , Liang Mao 1 , Junying Zhang 1 , Tetsuro Majima 2
Affiliation
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Visible and near-infrared (NIR) light utilization is a high-priority target for solar-to-chemical energy conversion. In this work, a promising surface heterojunction-based plasmonic photocatalyst was developed by integrating Au nanorods (NRs) with La2Ti2O7 nanosteps (Au-LTO NSP) for photocatalytic H2 evolution in visible and near-infrared (NIR) regions. At wavelengths longer than 420 nm, Au-LTO NSP displayed H2 production rate that was separately 2.4 and 4.7 times that of Au-LTO nanosheets (NS) and Au–P25 composites, using methanol as the sacrificial agent. At wavelengths longer than 780 nm, the enhancement was 2.3 and 5.8 times, respectively. The high apparent quantum efficiency (AEQ) of 1.4% at 920 nm irradiation makes the Au-LTO NSP photocatalyst especially efficient for the NIR light utilization. The broadband photocatalytic activity of Au-LTO NSP was mainly caused by longitudinal surface plasmon resonance of Au NRs, generating and injecting hot electrons into LTO NSP. Substantial electrons transferred from Au NRs to the (010) facets and then directionally migrated to the (012) facets of LTO NSP, as consequence of the successive (010) and (012) surface heterojunctions within a LTO NSP single particle. The unique step structure of LTO retarded the recombination of the photoinduced electrons and holes in Au NRs, showing the powerful role of the semiconductor surface heterojunction in favoring the plasmon-induced interfacial hot electron transfer.
中文翻译：
金纳米棒光敏的La 2 Ti 2 O 7纳米步骤：连续的表面异质结促进可见光到近红外光催化H 2的演化
可见光和近红外（NIR）光利用率是太阳能转化为化学能的高度优先目标。在这项工作中，通过将Au纳米棒（NRs）与La 2 Ti 2 O 7纳米台阶（Au-LTO NSP）集成在一起，开发了一种有前途的基于表面异质结的等离激元光催化剂，用于在可见光和近红外（NIR）区中光催化H 2的演化。 。在波长大于420 nm时，Au-LTO NSP显示H 2使用甲醇作为牺牲剂，其生产率分别是Au-LTO纳米片（NS）和Au-P25复合材料的2.4倍和4.7倍。在大于780 nm的波长处，增强分别为2.3倍和5.8倍。在920 nm辐射下1.4％的高表观量子效率（AEQ）使Au-LTO NSP光催化剂对NIR光的利用特别有效。Au-LTO NSP的宽带光催化活性主要是由于Au NRs的纵向表面等离子体激元共振，产生热电子并将其注入LTO NSP。由于LTO NSP单个粒子内连续的（010）和（012）表面异质结，大量的电子从Au NRs转移到（010）面，然后定向迁移到LTO NSP的（012）面。
更新日期：2017-11-30
中文翻译：
金纳米棒光敏的La 2 Ti 2 O 7纳米步骤：连续的表面异质结促进可见光到近红外光催化H 2的演化
可见光和近红外（NIR）光利用率是太阳能转化为化学能的高度优先目标。在这项工作中，通过将Au纳米棒（NRs）与La 2 Ti 2 O 7纳米台阶（Au-LTO NSP）集成在一起，开发了一种有前途的基于表面异质结的等离激元光催化剂，用于在可见光和近红外（NIR）区中光催化H 2的演化。 。在波长大于420 nm时，Au-LTO NSP显示H 2使用甲醇作为牺牲剂，其生产率分别是Au-LTO纳米片（NS）和Au-P25复合材料的2.4倍和4.7倍。在大于780 nm的波长处，增强分别为2.3倍和5.8倍。在920 nm辐射下1.4％的高表观量子效率（AEQ）使Au-LTO NSP光催化剂对NIR光的利用特别有效。Au-LTO NSP的宽带光催化活性主要是由于Au NRs的纵向表面等离子体激元共振，产生热电子并将其注入LTO NSP。由于LTO NSP单个粒子内连续的（010）和（012）表面异质结，大量的电子从Au NRs转移到（010）面，然后定向迁移到LTO NSP的（012）面。
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