Visible-light-driven catalytic activity enhancement of Pd in AuPd nanoparticles for hydrogen evolution from formic acid at room temperature
Visible-light-driven catalytic activity enhancement of Pd in AuPd nanoparticles for hydrogen evolution from formic acid at room temperature
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DOI：
10.1016/j.apcatb.2016.11.059
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发表时间：
2017-05-05
影响因子：
22.1
通讯作者：
Su, Haiquan
中科院分区：
文献类型：
--
作者：
Liu, Penglong;Gu, Xiaojun;Su, Haiquan
采用易浸渍还原法制备了一系列氧化石墨烯（GO）负载的双金属AuPd纳米颗粒（NPs），并将其作为催化剂，在298 K可见光照射下进行甲酸（HCOOH）的析氢反应（HER）。结果表明，双金属催化剂对可见光有较强的吸收，且与不同Au/Pd摩尔比的催化剂在暗处的活性相比，其在可见光照射下的活性显著增强。其中Au-1 Pd-2/GO表现出最高的活性，在298 K时TOF值为954.2 h(-1)，是所报道的多相催化剂中最高的。双金属催化剂的光催化活性增强的主要原因是具有局部表面等离子体共振（LSPR）效应的非活性Au组分的电子有效转移到活性Pd位点。催化剂中的负载氧化石墨烯可以看作是电子的收集器和转运体，也有助于提高催化活性。此外，Au-1 Pd-2/GO的催化活性强烈依赖于入射光的强度和波长，表明可见光照射确实在催化活性增强中发挥了关键作用。(C) 2016 Elsevier B.V.版权所有
A series of bimetallic AuPd nanoparticles (NPs) supported by graphene oxide (GO) were synthesized using a facile impregnation-reduction method, which were used as catalysts for the hydrogen evolution reaction (HER) from formic acid (HCOOH) under visible light irradiation at 298 K. The results showed that the bimetallic catalysts strongly absorbed visible light, and in comparison with the activities of all the catalsyts with various molar ratios of Au/Pd in the dark, their activities were remarkably enhanced under visible light irradiation. Especially, Au-1 Pd-2/GO exhibited the highest activity featuring initial turnover frequency (TOF) value of 954.2 h(-1) at 298 K, which was among the highest values for the reported heterogeneous catalysts. The enhanced photocatalytic activities of bimetallic catalysts could be mainly attributed to the efficient electron transfer from inactive Au species with localized surface plasmori resonance (LSPR) effect to active Pd sites. Support GO in the catalysts could be regarded as the electron collector and transporter and then also contributed to the enhanced catalytic activity. Furthermore, the catalytic activity of Au-1 Pd-2/GO strongly depended on the intensity and wavelength of incident light, indicating that the visible light irradiation indeed played a key role in the enhanced catalytic activity. (C) 2016 Elsevier B.V. All rights reserved.