Enhanced Electrocatalysis via Boosted Separation of Hot Charge Carriers of Plasmonic Gold Nanoparticles Deposited on Reduced Graphene Oxide,ChemElectroChem

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Enhanced Electrocatalysis via Boosted Separation of Hot Charge Carriers of Plasmonic Gold Nanoparticles Deposited on Reduced Graphene Oxide
ChemElectroChem ( IF 3.5 ) Pub Date : 2019-01-10 , DOI: 10.1002/celc.201801683
Xue‐Wei Liao ₁ , Shan‐Shan Wang ₂ , Gui‐Yin Xu ₃ , Chen Wang ₂

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Plasmon enhancement in electrocatalysis was investigated on pure Au nanoparticles (AuNPs) and an AuNPs‐reduced graphene oxide (AuNPs/rGO) hybrid. Upon localized surface plasmon resonance (LSPR) excitation, hot charge carriers (hot electrons and holes) generate on the AuNPs. In the experiments, hot holes were scavenged by glucose and hot electrons could be efficiently transferred to the external electric circuit under a potential bias, resulting in an observable current enhancement. Then, the hot electrons′ transfer efficiency can be quantitatively compared by the increased current response. It was found that the current density increased more obviously on the AuNPs/rGO hybrid than on pure AuNPs upon light irradiation. Due to the excellent electron mobility of rGO and the perfect electron affinity capacity, the hot electrons generated on AuNPs are efficiently transferred to the closely contacted rGO, then flow into the external circuit, generating current. The present study highlights the role of rGO in improving the separation of hot charge carriers to promote photocatalytic reactions.

中文翻译：

通过增强的还原性氧化石墨烯上沉积的等离子金纳米颗粒的热电荷载体的增强分离增强电催化作用。

研究了纯金纳米颗粒（AuNPs）和AuNPs还原的氧化石墨烯（AuNPs / rGO）杂化物对等离子体中电催化增强的影响。在局部表面等离子体共振（LSPR）激发后，AuNPs上会生成热电荷载流子（热电子和空穴）。在实验中，热空穴被葡萄糖清除，并且热电子可以在电势偏置下有效地转移到外部电路，从而产生可观察到的电流增强。然后，可以通过增加的电流响应来定量比较热电子的传输效率。发现在光照射下，AuNPs / rGO杂化物上的电流密度比纯AuNPs上的电流密度增加更明显。由于rGO的出色电子迁移率和完美的电子亲和力，在AuNPs上产生的热电子被有效地转移到紧密接触的rGO，然后流入外部电路，产生电流。本研究强调了rGO在改善热载流子的分离以促进光催化反应中的作用。

更新日期：2019-01-10

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