Efficient photothermal conversion of Fe₂O₃–RGO guided from ultrafast quenching effect of photoexcited state

Abstract

In solar thermal utilization, effective photo capture and photothermal conversion are crucial. Improving the nonradiative transition rate of photoexcited electrons is important to enhance the photothermal conversion efficiency and develop efficient solar thermal utilization. Herein, we designed a new kind of light absorption-enhanced and efficient photothermal conversion material, namely, Fe 2 O 3 -functionalized reduced graphene oxide (Fe 2 O 3 -RGO). On the basis of the selective absorption (350-560 nm) of Fe 2 O 3 and the synergistic effect of RGO on the quenching energy transfer of the excited state of Fe 2 O 3 and ultrafast nonradiative thermal decay of RGO, the optical absorption capacity, and photothermal conversion efficiency of the composites were effectively improved. Fe 2 O 3 -RGO can be successfully applied to photothermal conversion phase change materials and seawater solar desalination, showing excellent photothermal conversion ability and application prospect. K E Y W O R D S enhanced light absorption, Fe 2 O 3 -RGO, photothermal conversion, quenching effect, seawater solar desalination

Graphene-Based Double-Sided Light Absorption Evaporators with Enhanced Water Supply for Solar Desalination

“…The photothermic conversion capacity of the evaporator plays a critical role in ensuring efficient seawater desalination, which has a significant impact on the efficiency of evaporation. , The infrared camera is utilized for real-time monitoring of the evaporator surface temperature, as depicted in Figure b, and the surface of pure seawater exhibits slow temperature rise under 1 sun irradiation without any evaporator for 1 h. Therefore, an effective interface evaporation method is introduced, and the temperature response of seven evaporators at 1 sun is compared. It is noteworthy that the carbonized evaporator at 600 °C can achieve a temperature increase of 46.5 °C within 1 min, possibly attributing to the synergistic effect of excellent photothermal conversion properties of carbon materials and double-sided absorption capabilities of the graphene film.…”

Thermogalvanic organohydrogel-based non-contact self-powered electronics for advancing smart agriculture

“…17,18 Among the various forms of solar energy conversion, solar thermal technology is a commonly used technique for harnessing solar energy that achieves the highest conversion efficiency, making it suitable for various applications in industries, households, and daily life. [19][20][21][22][23] As demonstrated in the literature, photothermal materials can generate heat under solar irradiation and increase the conversion efficiency of devices by combining photovoltaic and solar-thermoelectric effects for driving mechanical systems or solar thermometry generators. [24][25][26][27][28] However, expensive materials, complex synthesis processes and structural configurations, as well as undesirable long-term reliability greatly limit their applications.…”

Preparation of polyether based form-stable phase change hydrogel: towards high performance cold energy storage

“…Based on phase change temperature, PCMs are divided into two main types; heat energy storage PCMs and cold energy storage PCMs. Traditionally, heat energy storage PCMs have been widely used in industrial waste heat recovery [2][3][4] , solar energy storage [5][6][7] , building energy conservation [8] , thermal management of battery packs [9,10] etc. Several research groups have studied functionalization [11] , shape stability [12][13][14][15] , thermal conductivity improvement [16,17] and applications of heat storage PC [18,19] .…”