Modification of eosin Y and cobalt molecular catalyst system with reduced graphene oxide for enhanced photocatalytic hydrogen production,Catalysis Science & Technology

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Modification of eosin Y and cobalt molecular catalyst system with reduced graphene oxide for enhanced photocatalytic hydrogen production
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-06-22 , DOI: 10.1039/d0cy00937g
Anna Lewandowska-Andralojc _{1,

2,

3,

4,

5} , Artur Malolepszy _{4,

6,

7,

8} , Anika Stritt _{9,

10,

11,

12} , Andreas Grohmann _{9,

10,

11,

12}

Affiliation

By using reduced graphene oxide (RGO) as a support for the molecular cobalt catalyst (Co(bpy)₃²⁺), a new composite material RGO–Co(bpy)₃²⁺ for photocatalytic hydrogen production was prepared. The photocatalytic system, containing eosin Y (EY) as a sensitizer, Co(bpy)₃²⁺ as a catalyst, RGO as a support and triethylamine (TEA) as a sacrificial electron donor, exhibited under visible light irradiation a 2.2 times increase in hydrogen production in comparison to the system without RGO. The composites display a higher turnover number (TON), up to 185 based on Co(bpy)₃²⁺ and the highest apparent quantum yield reached 7.4% at 505 nm. Hydrogen production enhancement in the presence of RGO is attributed to the more efficient electron-transfer to the catalyst and retardation of the self-degradation path of EY radical anion mediated by RGO, which was verified using steady-state and time-resolved spectroscopy.

中文翻译：

还原氧化石墨烯对曙红Y和钴分子催化剂体系的改性，以提高光催化制氢能力

通过使用氧化石墨烯（RGO）作为分子钴催化剂（Co（bpy）₃²⁺）的载体，制备了用于光催化制氢的新型复合材料RGO-Co（bpy）₃²⁺。包含曙红Y（EY）作为敏化剂，Co（bpy）₃²⁺作为催化剂，RGO作为载体和三乙胺（TEA）作为牺牲电子供体的光催化系统在可见光照射下的光催化活性增加了2.2倍。与没有RGO的系统相比，氢气的产生。复合材料显示更高的周转率（TON），基于Co（bpy）₃²⁺最高为185505nm处的最高表观量子产率达到7.4％。RGO存在下氢产量的提高归因于更有效的电子转移至催化剂和RGO介导的EY自由基阴离子自降解路径的阻滞，这已通过稳态和时间分辨光谱学进行了验证。

更新日期：2020-07-21

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