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In-situ one-pot fabrication of MoO3-x clusters modified polymer carbon nitride for enhanced photocatalytic hydrogen evolution
江治
上海交通大学燃烧与环境技术研究中心, 上海200240
Abstract:
Developing low-cost and high-efficient noble-metal-free cocatalysts has been a challenge to achieve economic hydrogen production. In this work, molybdenum oxides (MoO3-x) were in-situ loaded on polymer carbon nitride (PCN) via a simple one-pot impregnation-calcination approach. Different from post-impregnation method, intimate coupling interface between high-dispersed ultra-small MoO3-x nanocrystal and PCN was successfully formed during the in-situ growth process. The MoO3-x-PCN-x photocatalyst without noble platinum (Pt) finally exhibited enhanced photocatalytic hydrogen performance under visible light irradiation (λ>420 nm), with the highest hydrogen evolution rate of 15.6 μmol/h, which was more than 3 times that of bulk PCN. Detailed structure-performance revealed that such improvement in visible-light hydrogen production activity originated from the intimate interfacial interaction between high-dispersed ultra-small MoO3-x nanocrystal and polymer carbon nitride as well as efficient charge carriers transfer brought by Schottky junction formed.
Key words:  Noble-metal-free cocatalyst, Polymer carbon nitride, MoO3-x clusters, Schottky junction, Photocatalytic hydrogen production
FundProject:
MoO3-x/PCN的原位合成及其增强光催化产氢性能的研究
江治
上海交通大学燃烧与环境技术研究中心, 上海200240
摘要:
开发低成本,高效的非贵金属助催化剂一直以来是实现低成本规模化太阳能光解水制氢面临的重要挑战。在本工作中,通过简单的一步浸渍煅烧法原位合成了氧化钼纳米晶/聚合物氮化碳复合光催化剂。上述不含铂基助催化剂的氧化钼修饰聚合物氮化碳光催化剂在可见光照射下表现出增强的光催化产氢性能,最高产氢速率为15.6 μmol/ h,是普通聚合物氮化碳样品的3倍以上。相应的结构与性能的分析表明,与后浸渍法不同,在原位生长过程中高分散的超小氧化钼纳米晶体与聚合物氮化碳之间形成了紧密的耦合界面结构,可见光产氢活性的提升源自高分散的超小氧化钼纳米晶与聚合物氮化碳之间形成的紧密界面,以及该界面结构形成的肖特基结带来的有效电荷载流子转移。
关键词:  非贵金属助催化剂  聚合物氮化碳  氧化钼  肖特基结  光催化制氢
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