Cascade utilization of full spectrum solar energy for achieving simultaneous hydrogen production and all-day thermoelectric conversion

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外文摘要：Solar-driven photocatalytic water/seawater splitting holds great potential for green hydrogen produc-tion.However,the practical application is hindered by the relatively low conversion efficiency resulting from the inadequate utilization of solar spectrum with significant waste in the form of heat.Moreover,current equipment struggles to maintain all-day operation subjected to the lack of light during nighttime.Herein,a novel hybrid system integrating photothermal catalytic(PTC)reactor,thermoelectric generator(TEG),and phase change materials(PCM)was proposed and designed(named as PTC-TEG-PCM)to address these challenges and enable simultaneous overall seawater splitting and 24-hour power gener-ation.The PTC system effectively maintains in an optimal temperature range to maximize photothermal-assisted photocatalytic hydrogen production.The TEG component recycles the low-grade waste heat for power generation,complementing the shortcoming of photocatalytic conversion and achieving cascade utilization of full-spectrum solar energy.Furthermore,exceptional thermal storage capability of PCM allow for the conversion of released heat into electricity during nighttime,contributing significantly to the overall power output and enabling PTC-TEG-PCM to operate for more than 12 h under the actual con-dition.Compared to traditional PTC system,the overall energy conversion efficiency of the PTC-TEG-PCM system can be increased by～500％,while maintaining the solar-to-hydrogen efficiency.The advancement of this novel system demonstrated that recycling waste heat from the PTC system and utilizing heat absorption/release capability of PCM for thermoelectric application are effective strategies to improve solar energy conversion.With flexible parameter designing,PTC-TEG-PCM can be applied in various sce-narios,offering high efficiency,stability,and sustainability.

外文关键词：

Hybrid solar energy conversion systemPhotocatalytic overall seawater splittingThermoelectric power generationPhase change materialsAll-day operation

作者：

Tuo Zhang、Liang Dong、Baoyuan Wang、Jingkuo Qu、Xiaoyuan Ye、Wengao Zeng、Ze Gao、Bin Zhu、Ziying Zhang、Xiangjiu Guan、Liejin Guo

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作者单位：

International Research Center for Renewable Energy(IRCRE),State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,Shaanxi,China

基金：

Basic Science Center Program for Ordered Energy Conversion of the National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Postdoctoral Science FoundationChina Postdoctoral Science FoundationChina Fundamental Research Funds for the Central Universities

项目编号：

52488201523762092020T1305032020M673386

出版年：

2024

DOI：

10.1016/j.jechem.2024.05.007

能源化学

中国科学院大连化学物理研究所中国科学院成都有机化学研究所

能源化学

CSTPCDEI

影响因子：0.654

ISSN：2095-4956

年,卷(期)：2024.96(9)