Surface spintronics enhanced photo-catalytic hydrogen evolution: Mechanisms, strategies, challenges and future
Surface spintronics enhanced photo-catalytic hydrogen evolution: Mechanisms, strategies, challenges and future
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表面自旋电子学增强光催化析氢：机制、策略、挑战和未来
DOI：
10.1016/j.apsusc.2017.10.228
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发表时间：
2018
影响因子：
6.7
通讯作者：
Lu Gongxuan
中科院分区：
文献类型：
--
作者：
Zhang Wenyan;Gao Wei;Zhang Xuqiang;Li Zhen;Lu Gongxuan
氢是一种绿色能源载体，具有高焓、零环境污染排放的特点。光催化析氢（HER）是一种可持续的、有前途的制氢方法。尽管光催化HER的研究取得了很大的成就，但由于一些光催化剂的电子转移损失不理想、HER过电位高、稳定性低，导致其HER性能和抗光腐蚀性能不理想，其效率仍然受到限制。近年来，许多自旋电子学研究显示了它们对光催化HER的增强作用。例如，据报道，自旋极化光电子可以在光催化体系中产生更高的光电流和更高的HER翻转频率（高达200%）。电子自旋极化有两种策略，分别是利用重原子效应和磁感应效应。理论和实验研究表明，在光催化反应中控制oh自由基点自由基的自旋态不仅可以降低水裂解的OER过电位（甚至达到0 eV），还可以提高光催化剂的稳定性和电荷寿命。提出了一种利用手性分子自旋过滤光电子来调整oradical点自旋态的简便策略。通过手性诱导自旋滤波，电子极化率可接近74%，明显大于传统的过渡金属器件。这些成果显示了自旋电子学在增强光催化HER方面的光明前景，但目前还很少有系统的综述和分析。本文综述了近年来自旋电子学在光催化HER研究中的进展，系统地总结了相关机理和提出的重要策略。讨论了自旋电子学增强光催化HER研究面临的挑战和发展趋势，以期理解和探索光催化HER跨学科研究。
Hydrogen is a green energy carrier with high enthalpy and zero environmental pollution emission characteristics. Photocatalytic hydrogen evolution (HER) is a sustainable and promising way to generate hydrogen. Despite of great achievements in photocatalytic HER research, its efficiency is still limited due to undesirable electron transfer loss, high HER over-potential and low stability of some photocatalysts, which lead to their unsatisfied performance in HER and anti-photocorrosion properties. In recent years, many spintronics works have shown their enhancing effects on photo-catalytic HER. For example, it was reported that spin polarized photo-electrons could result in higher photocurrents and HER turn-over frequency (up to 200%) in photocatalytic system. Two strategies have been developed for electron spin polarizing, which resort to heavy atom effect and magnetic induction respectively. Both theoretical and experimental studies show that controlling spin state of OHradical dot radicals in photocatalytic reaction can not only decrease OER over-potential (even to 0 eV) of water splitting, but improve stability and charge lifetime of photocatalysts. A convenient strategy have been developed for aligning spin state of OHradical dot by utilizing chiral molecules to spin filter photo-electrons. By chiral-induced spin filtering, electron polarization can approach to 74%, which is significantly larger than some traditional transition metal devices. Those achievements demonstrate bright future of spintronics in enhancing photocatalytic HER, nevertheless, there is little work systematically reviewing and analysis this topic. This review focuses on recent achievements of spintronics in photocatalytic HER study, and systematically summarizes the related mechanisms and important strategies proposed. Besides, the challenges and developing trends of spintronics enhanced photo-catalytic HER research are discussed, expecting to comprehend and explore such interdisciplinary research in photocatalytic HER.