当前位置: X-MOL 学术Adv. Sci. › 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.)
Reduced Graphene Oxide-Based Spectrally Selective Absorber with an Extremely Low Thermal Emittance and High Solar Absorptance.
Advanced Science ( IF 14.3 ) Pub Date : 2020-02-27 , DOI: 10.1002/advs.201903125
Qihua Liao 1 , Panpan Zhang 1 , Houze Yao 1 , Huhu Cheng 1 , Chun Li 2 , Liangti Qu 1, 2, 3
Affiliation  

Carbon-based black materials exhibit strong solar absorptance (αsolar >0.90), which play key roles in transforming solar energy into available power for solar-thermal, thermophotovoltaic, thermoelectric, and many other systems. However, because of high thermal emittance (>95%), these carbon-based materials always cause huge energy loss that hinders the solar-thermal conversion efficiency tremendously. In this study, a reduced graphene oxide-based spectrally selective absorber (rGO-SSA) is demonstrated, which possesses a recorded low thermal emittance (≈4%) and high solar absorptance (αsolar ≈ 0.92) by easily regulating the reduction level of inner 2D graphene sheets. Compared to conventional carbon-based black materials, thermal emittance of this rGO-SSA is largely reduced by ≈95.8% and the cutoff wavelength of rGO-SSA is broadband-tunable that can range from 1.1 to 3.2 µm. More importantly, this simply sol-gel coated rGO-SSA has high temperature tolerance at 800 °C for 96 h that is hardly achieved by other cermet-based or photonic-based SSAs. Based on this rGO-SSA, ultrafast solar steam escape (0.94 mg cm-2 s-1) under concentrated solar irradiance is achieved directly. The insight from this study will provide a new strategy for constructing thermally stable carbon-based SSAs and greatly facilitate the solar-thermal practical significance.

中文翻译:


具有极低热发射率和高太阳能吸收率的还原氧化石墨烯光谱选择性吸收剂。



碳基黑色材料表现出很强的太阳能吸收率(αsolar >0.90),在将太阳能转化为光热、热光伏、热电和许多其他系统的可用电力方面发挥着关键作用。然而,由于这些碳基材料的热发射率较高(>95%),往往会造成巨大的能量损失,极大地阻碍了光热转换效率。在这项研究中,展示了一种基于还原氧化石墨烯的光谱选择性吸收剂(rGO-SSA),通过轻松调节内部还原水平,该吸收剂具有记录的低热发射率(约4%)和高太阳吸收率(αsolar约0.92)。二维石墨烯片。与传统的碳基黑色材料相比,该rGO-SSA的热发射率大大降低了约95.8%,并且rGO-SSA的截止波长是宽带可调的,范围为1.1至3.2 µm。更重要的是,这种简单的溶胶凝胶涂层的 rGO-SSA 具有 800 °C 96 小时的高温耐受性,这是其他基于金属陶瓷或基于光子的 SSA 很难实现的。基于该rGO-SSA,直接实现了集中太阳辐照度下的超快太阳蒸汽逸出(0.94 mg cm-2 s-1)。这项研究的见解将为构建热稳定的碳基SSAs提供新的策略,并极大地促进太阳能热的实际意义。
更新日期:2020-04-21
down
wechat
bug