Solar energy fits well with the increasing demand for clean sustainable energy. This paper describes a freestanding hybrid film composed of a conductive metal–organic framework layered on cellulose nanofibres which enables efficient solar power generation. The working principle, which is different from the mechanisms of traditional photovoltaic or solid-state thermoelectric generation systems, is based on ionic thermophoresis and electrokinetic effects. Given the strong light absorption and low thermal conductivity of the film, a large thermal gradient can be produced on the surface under light illumination to induce fast water evaporation in an aqueous electrolyte. The thermal gradient and the water evaporation drive selective ion transport through the charged nanochannels, which generates ionic thermoelectric and streaming potentials, respectively. The assembled device can produce a sustained voltage output of ∼1.1 V, with a high power density of up to 15 W m⁻² under one sun illumination. This study provides a new route for solar power generation.

中文翻译：

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通过纳米纤维素@导电金属有机框架的太阳能驱动离子发电

太阳能与对清洁可持续能源不断增长的需求非常吻合。本文介绍了一种独立的杂化膜，该杂化膜由一层导电的金属-有机骨架组成，层合在纤维素纳米纤维上，可实现高效的太阳能发电。该工作原理不同于传统的光伏或固态热电发电系统，其原理是基于离子热泳和电动效应。考虑到膜的强光吸收和低热导率，在光照下可以在表面上产生大的热梯度，以在水性电解质中引起快速的水蒸发。热梯度和水蒸发驱动选择性的离子通过带电的纳米通道传输，从而产生离子热电势和流电势，分别。组装后的设备可产生约1.1 V的持续电压输出，且功率密度高达15 W m^－2在一个阳光照射下。这项研究为太阳能发电提供了一条新途径。