Integrating a redox flow battery into a Z-scheme water splitting system for enhancing the solar energy conversion efficiency†,Energy & Environmental Science

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Integrating a redox flow battery into a Z-scheme water splitting system for enhancing the solar energy conversion efficiency†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-12-17 00:00:00 , DOI: 10.1039/c8ee01299g
Zhen Li _{1,

2,

3,

4,

5} , Wangyin Wang _{1,

2,

3} , Shichao Liao _{1,

2,

3} , Mingyao Liu _{1,

2,

3,

6,

7} , Yu Qi _{1,

2,

3} , Chunmei Ding _{1,

2,

3} , Can Li _{1,

2,

3}

Affiliation

Photocatalytic Z-scheme water splitting is regarded as a promising approach for efficient conversion of solar energy into hydrogen. However, there is a considerable energy loss during the electron transfer process between two photosystems. How to cut down the energy loss becomes a critical issue for improving the solar energy conversion efficiency. Herein, we analyze and evaluate the maximal room for energy storage in photocatalytic water splitting systems and propose a strategy of integrating a redox flow battery (RFB) into a Z-scheme water splitting system to reduce the energy loss. Moreover, we construct a biohybrid photosystem II (PSII)–ZrO₂/TaON Z-scheme system with an integrated quinone/ferricyanide RFB. The platform system can generate both electricity and hydrogen utilizing solar energy through photocatalytic charge and discharge processes of the RFB and the water splitting reaction, resulting in the enhancement of the solar energy conversion efficiency. This proof-of-concept work opens a new avenue to save the energy dissipated in Z-scheme water splitting for more efficient solar energy conversion.

中文翻译：

将氧化还原液流电池集成到Z方案水分解系统中，以提高太阳能转换效率†

光催化Z方案水分解被认为是将太阳能有效转化为氢的有前途的方法。但是，在两个光系统之间的电子转移过程中，能量损失很大。如何减少能量损失成为提高太阳能转换效率的关键问题。本文中，我们分析和评估了光催化水分解系统中的最大能量存储空间，并提出了将氧化还原液流电池（RFB）集成到Z方案水分解系统中以减少能量损失的策略。此外，我们构建了生物混合光系统II（PSII）–ZrO ₂/ TaON Z方案系统，带有集成的醌/铁氰化物RFB。该平台系统可以通过RFB的光催化充电和放电过程以及水分解反应，利用太阳能发电和产生氢气，从而提高了太阳能转换效率。这项概念验证工作开辟了一条新途径，以节省Z方案水分解过程中所耗散的能量，从而实现更高效的太阳能转化。

更新日期：2018-12-17

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