Guo Shaohui, Li Xuanhua, Li Ju, Wei Bingqing
State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, China.
Department of Nuclear Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
Nat Commun. 2021 Feb 26;12(1):1343. doi: 10.1038/s41467-021-21526-4.
Solar-driven hydrogen production from water using particulate photocatalysts is considered the most economical and effective approach to produce hydrogen fuel with little environmental concern. However, the efficiency of hydrogen production from water in particulate photocatalysis systems is still low. Here, we propose an efficient biphase photocatalytic system composed of integrated photothermal-photocatalytic materials that use charred wood substrates to convert liquid water to water steam, simultaneously splitting hydrogen under light illumination without additional energy. The photothermal-photocatalytic system exhibits biphase interfaces of photothermally-generated steam/photocatalyst/hydrogen, which significantly reduce the interface barrier and drastically lower the transport resistance of the hydrogen gas by nearly two orders of magnitude. In this work, an impressive hydrogen production rate up to 220.74 μmol h cm in the particulate photocatalytic systems has been achieved based on the wood/CoO system, demonstrating that the photothermal-photocatalytic biphase system is cost-effective and greatly advantageous for practical applications.
使用颗粒光催化剂从水中太阳能驱动制氢被认为是生产氢燃料最经济有效的方法，且几乎不涉及环境问题。然而，颗粒光催化系统中从水制氢的效率仍然很低。在此，我们提出一种由集成光热 - 光催化材料组成的高效双相光催化系统，该系统使用炭化木材基板将液态水转化为水蒸气，同时在光照下无需额外能量即可分解出氢气。光热 - 光催化系统呈现出光热产生的蒸汽/光催化剂/氢气的双相界面，这显著降低了界面屏障，并将氢气的传输阻力大幅降低了近两个数量级。在这项工作中，基于木材/CoO系统，在颗粒光催化系统中实现了高达220.74 μmol h cm的令人印象深刻的产氢速率，表明光热 - 光催化双相系统具有成本效益且在实际应用中具有很大优势。
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