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首页> 外文期刊>RSC Advances >Self-dispersible graphene quantum dots in ethylene glycol for direct absorption-based medium-temperature solar-thermal harvesting
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Self-dispersible graphene quantum dots in ethylene glycol for direct absorption-based medium-temperature solar-thermal harvesting

机译：用于直接吸收的中温太阳能热收割机的乙二醇中的自分散石墨烯量子点

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摘要

Poor dispersion stability of carbon nanofluids is one of the key issues limiting their solar-thermal applications especially under medium-to-high temperatures. Herein, this work reported a facile way to prepare stably dispersed graphene quantum dot-ethylene glycol (GQD-EG) medium-temperature solar-thermal nanofluids. The hydroxyl-terminated GQDs were synthesized by a scalable hydrothermal approach. The obtained GQDs have a small particle size, narrow particle size distribution and are self-dispersible within EG fluids. The GQD-EG nanofluids maintained their uniform dispersion after continuous heating at 180 °C for 7 days. The hydrogen bonding between the hydroxyl group on the surface of GQDs and the EG molecules helped achieve homogenous dispersion of GQDs in the nanofluids, and the small particle size and low density of GQDs helped mitigate the sedimentation tendency. The dispersed GQD-EG nanofluids have demonstrated broadband absorption of sunlight, high specific heat capacity and low viscosity, which are all desired for high-performance direct absorption-based solar-thermal energy. The prepared GQD-EG nanofluids have exhibited consistent volumetric harvesting of solar-thermal energy under concentrated solar illumination with a heating temperature up to 170 °C.
机译：碳纳米流体的不良分散稳定性是限制其太阳能热应用的关键问题之一，尤其是在中至高温下。这里，该工作报告了制备稳定分散的石墨烯量子点 - 乙二醇（GQD-EG）中温太阳能热纳米流体的容易方式。通过可伸缩的水热方法合成羟基封端的GQD。所获得的GQD具有小的粒度，窄粒度分布，并且在例如流体内是自分散的。 GQD-例如纳米流体在连续加热180℃下保持均匀的分散体7天。 GQDS表面的羟基与例如分子之间的氢键合有助于在纳米流体中实现GQD的均匀分散，并且GQD的小粒度和低密度有助于减轻沉降趋势。分散的GQD-例如纳米流体已经证明了阳光，高比热容量和低粘度的宽带吸收，这一切都需要高性能直接吸收的太阳能热能。制备的GQD-例如纳米流体已经在浓缩的太阳能照射下表现出一致的太阳能测量，加热温度高达170℃。

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