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An integrated thermoelectric-assisted photoelectrochemical system to boost water splitting
Science Bulletin ( IF 18.9 ) Pub Date : 2020-03-30 , DOI: 10.1016/j.scib.2020.03.041
Yuyang Kang 1 , Runze Chen 2 , Chao Zhen 1 , Lianzhou Wang 3 , Gang Liu 1 , Hui-Ming Cheng 4
Affiliation  

Common solar-driven photoelectrochemical (PEC) cells for water splitting were designed by using semiconducting photoactive materials as working photoelectrodes to capture sunlight. Due to the thermodynamic requirement of 1.23 eV and kinetic energy loss of about 0.6 eV, a photo-voltage of 1.8 V produced by PEC cells is generally required for spontaneous water splitting. Therefore, the minimum bandgap of 1.8 eV is demanded for photoactive materials in single-photoelectrode PEC cells, and the bandgap of about 1 eV for back photoactive materials is appropriate in tandem PEC cells. All these PEC cells cannot effectively utilize the infrared light from 1250 to 2500 nm. In order to realize the full spectrum utilization of solar light, here, we develop a solar-driven PEC water splitting system integrated with a thermoelectric device. The key feature of this system is that the thermoelectric device produces a voltage as an additional bias for the PEC system by using the temperature difference between the incident infrared-light heated aqueous electrolyte in the PEC cell as the hot source and unirradiated external water as the cold source. Compared to a reference PEC system without the thermoelectric device, this system has a significantly improved overall water splitting activity of 1.6 times and may provide a strategy for accelerating the application of full spectrum solar light-driven PEC cells for hydrogen production.



中文翻译:

一种集成的热电辅助光电化学系统以促进水分解

用于水分解的普通太阳能驱动光电化学 (PEC) 电池是通过使用半导体光敏材料作为工作光电极来捕获阳光而设计的。由于 1.23 eV 的热力学要求和约 0.6 eV 的动能损失,自发水分解通常需要 PEC 电池产生的 1.8 V 光电压。因此,单光电极PEC电池中的光敏材料需要1.8 eV的最小带隙,串联PEC电池中背面光敏材料的带隙约为1 eV是合适的。所有这些 PEC 电池都不能有效利用 1250 至 2500 nm 的红外光。为了实现太阳光的全光谱利用,在这里,我们开发了一种与热电装置集成的太阳能驱动的 PEC 水分解系统。该系统的主要特点是热电装置利用 PEC 电池中入射红外光加热的含水电解质作为热源与未照射的外部水作为热源之间的温差,产生电压作为 PEC 系统的附加偏置。冷源。与没有热电装置的参考 PEC 系统相比,该系统的整体水分解活性显着提高了 1.6 倍,可能为加速全光谱太阳能光驱动 PEC 电池在制氢中的应用提供策略。

更新日期:2020-03-30
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