当前位置: X-MOL 学术Appl. Catal. B Environ. Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Direct unassisted hydrogen peroxide generation from oxygen and water on plasmonic Ag-graphene-Cu nanosandwitch
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2017-11-11 , DOI: 10.1016/j.apcatb.2017.11.026
Yaxing Liu , Fuyi Chen , Qiao Wang , Junpeng Wang , Jiali Wang

A nanosandwich made from Ag nanoparticles (Ag NPs) arrays, the two-dimension single-layer graphene (SG) and metallic Cu contact was constructed for the hydrogen peroxide (H2O2) generation utilizing solar energy without an external bias. The shifting of binding energy towards lower energy in Ag core-level electronic spectrum is an evidence of strong coupling between Ag and graphene, which can efficiently transfer hot-holes from Ag to Cu by a built-in electric field so that the hot-electrons on Ag NPs are directly utilized to initiate the H2O2 generation. This Ag-graphene-Cu nanosandwitch can provide a stable photocurrent of −15.8 μA cm−2, a stable photovoltaic voltage of 17.5 mV cm−2, and a H2O2 yield of 229.33 μM after 6 h. To understand the mechanism of oxygen reduction reaction (ORR) in Ag-graphene-Cu systems, the electron transfer number for photocatalytic ORR and the surface facet of Ag NPs were studied. The Ag NPs in Ag-graphene-Cu systems with the deposition time of 180 s clearly shows that an amount of 〈200〉 facets are distributed on Ag nanoparticle surface, which can catalyze ORR by 2-electron pathway to generate H2O2 efficiently. This novel Ag-graphene-Cu nanosandwitch offers a new transfer path for hot-electrons and potentially provides a new concept for driving efficient solar energy to chemical energy.



中文翻译:

在等离激元Ag-石墨烯-铜纳米砂岩上由氧气和水直接无​​助地产生过氧化氢

构建了由银纳米粒子(Ag NPs)阵列,二维单层石墨烯(SG)和金属Cu接触制成的纳米三明治,利用太阳能在没有外部偏压的情况下生成过氧化氢(H 2 O 2)。Ag核心能级电子光谱中结合能向较低能的转移表明了Ag和石墨烯之间的强耦合,这可以通过内置电场有效地将热空穴从Ag转移到Cu,从而使热电子Ag上的NP直接用于引发H 2 O 2生成。该Ag-石墨烯-Cu纳米砂可以提供-15.8μAcm -2的稳定光电流,17.5 mV cm -2的稳定光伏电压。6小时后H 2 O 2产量为229.33μM。为了了解Ag-石墨烯-Cu体系中氧还原反应(ORR)的机理,研究了光催化ORR的电子转移数和Ag NPs的表面。沉积时间为180 s的Ag-石墨烯-Cu体系中的Ag NPs清楚地表明,大量的<200>刻面分布在Ag纳米颗粒表面,可以通过2电子途径催化ORR高效生成H 2 O 2。。这种新颖的银-石墨烯-铜纳米夹层女巫为热电子提供了一条新的转移途径,并有可能为将有效的太阳能转化为化学能提供新的概念。

更新日期:2017-11-11
down
wechat
bug