Polypyrrole nanostructures modified with mono- and bimetallic nanoparticles for photocatalytic H2 generation
Polypyrrole nanostructures modified with mono- and bimetallic nanoparticles for photocatalytic H2 generation
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DOI：
10.1039/c9ta11088g
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发表时间：
2020
影响因子：
--
通讯作者：
Xiaojiao Yuan;D. Dragoe;P. Beaunier;D. Uribe;L. Ramos;M. G. Méndez-Medrano;H. Remita
中科院分区：
文献类型：
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作者：
Xiaojiao Yuan;D. Dragoe;P. Beaunier;D. Uribe;L. Ramos;M. G. Méndez-Medrano;H. Remita
光催化分解水制氢技术是解决环境和能源问题的一条很有前途的绿色途径。共轭聚合物纳米结构（CPNs）是一类具有高π共轭结构的新型光催化剂。然而，由于快速的电荷载流子复合和缓慢的动力学，原始CPNs显示出较差的光催化制氢活性。聚吡咯在光催化制氢方面的应用研究也不多见。在这里，我们报告的表面改性的聚吡咯纳米结构（NS）与Pt和Ni基纳米粒子的光催化析氢。以层状中间相为软模板合成了聚吡咯纳米结构。采用辐射裂解法制备了单、双（Pt，Ni，Pt-Ni）助催化剂纳米粒子对PPy-NS进行改性。所制备的Pt-PPy、Ni-PPy和PtNi-PPy具有优异的光催化产氢活性，Pt和Ni的共修饰具有协同效应。研究了金属前驱体的性质和负载比对合成的影响。我们发现，负载率的助催化剂是至关重要的H2生成，和过量的助催化剂可以大大降低活性。复合光催化剂Pt-Ni-PPy纳米结构具有很高的活性和循环稳定性。我们的研究结果表明，与单-和cNONPs的改性CPNs是有前途的光催化剂的析氢。
Green hydrogen production by photocatalytic water splitting offers a promising way to solve environment and energy issues. Conjugated polymer nanostructures (CPNs), with highly π-conjugated structures, have been demonstrated as a new class of photocatalysts. However, pristine CPNs show poor photocatalytic activity for hydrogen generation owing to fast charge carrier recombination and sluggish kinetics. The investigation of application of polypyrrole in photocatalytic hydrogen generation is also rare. Here, we report the surface modification of polypyrrole nanostructures (NSs) with Pt- and Ni-based nanoparticles for photocatalytic hydrogen evolution. PPy nanostructures (NSs) were synthesized using lamellar mesophases as soft templates. The PPy-NSs were modified with mono- and bimetallic (Pt, Ni, Pt–Ni) co-catalyst nanoparticles induced by radiolysis. The prepared Pt-PPy, Ni-PPy and PtNi-PPy exhibit excellent photocatalytic activity for H2 generation and a synergistic effect is obtained with co-modification with Pt and Ni. The effects of the nature of the metal precursors and the loading ratio were studied. We show that the loading rate of co-catalysts is crucial for H2 generation, and an excess of co-catalyst can drastically decrease the activity. The composite photocatalyst Pt-Ni-PPy nanostructures are very active and stable with cycling. Our results indicate that modified CPNs with mono- and bimetallic NPs are promising photocatalysts for hydrogen evolution.