| 原位合成石墨烯负载的Co-P催化剂及光解水制氢 |
| In Situ Synthesis of Co-P/GP Photocatalysts for H2 Evolution from Water |
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| 摘要: 在石墨烯（GP）基底上利用光电子原位还原合成了具有非晶态结构的Co-P/GP光催化剂。通过X射线衍射仪（XRD）和透射电子显微镜（TEM）表征，证明所制备的催化剂在石墨烯载体上分散性好、粒径小，具有非晶态结构。由XPS表征了催化剂的表面电子状态，发现催化剂表面的Co和P主要是以还原态存在，有利于表面富集电子。经过曙红敏化，催化剂在可见光辐照下具有很好的光催化制氢性能。考察了不同物质的量之比nCo：nP的制氢速率，当nCo：nP =5：1时，3 h的平均制氢量为24.5 mmol·h-1·gCo-1。考察了不同波长条件下催化剂制氢的量子效率，当波长为430 nm时，Co-P/GP催化剂的制氢量子效率AQE达到8.4%，比没有添加P的Co/GP催化剂提高了1.5倍。 |
| 关键词: 非晶态合金 光催化 原位合成 石墨烯 制氢 |
| 基金项目: 国家自然科学基金（No.21173242）和国家自然科学基金重点项目（No.21433007）资助。 |
| Abstract: Utilizing the reducibility of photogenerated electrons, graphene (GP) supported Co-P/GP catalysts were synthesized via the in situ synthesis strategy. XRD characterizations showed that the synthesized catalysts were amorphous and the TEM showed the catalysts were deposited on the graphene surface homogeneously. The X-ray photoelectron spectroscopy (XPS) of Co-P/GP catalyst indicated that Co and P were over Co and P elements the catalysts with. The Co-P/GP catalyst exhibited high photocatalytic activities for hydrogen evolution sensitized by Eosin Y (EY). Photoactivities under different wavelength were investigated. The highest rate of the H2 evolution reached 24.5 mmol·h-1·gCo-1 under visible light with wavelength longer than 420 nm. The apparent quantum efficiency (AQE) over Co-P/GP (5:1) catalyst under 430 nm illuminations was achieved up to 8.4%, which was 50% higher than the Co/GP catalyst. |
| Keywords: amorphous alloy photocatalyst in situ synthesis graphene hydrogen evolution |
| 投稿时间：2015-12-23 修订日期：2016-05-17 |
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| 郭跃萍,吕功煊.原位合成石墨烯负载的Co-P催化剂及光解水制氢[J].无机化学学报,2016,32(7):1177-1182. |
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