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Enhanced Electrochemical Water Splitting with Chiral Molecule-Coated Fe3O4 Nanoparticles
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-09-04 00:00:00 , DOI: 10.1021/acsenergylett.8b01454 Wenyan Zhang 1 , Koyel Banerjee-Ghosh 1 , Francesco Tassinari 1 , Ron Naaman 1
ACS Energy Letters ( IF 19.3 ) Pub Date : 2018-09-04 00:00:00 , DOI: 10.1021/acsenergylett.8b01454 Wenyan Zhang 1 , Koyel Banerjee-Ghosh 1 , Francesco Tassinari 1 , Ron Naaman 1
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Photoelectrochemical (PEC) water splitting is a promising approach for generating hydrogen from water. In order to enhance PEC water splitting efficiency, it is essential to inhibit the production of the hydrogen peroxide byproduct and to reduce the overpotential required by an inexpensive catalyst and with high current density. In the past, it was shown that coating TiO2 electrodes by chiral molecules or chiral films enhances the hydrogen production and reduces the production of H2O2 byproduct. This was explained to be a result of the chiral-induced spin selectivity (CISS) effect that induces spin correlation between the electrons transferred to the anode. However, typically the current observed in those studies was in the range of 1–100 μA/cm2. Here we report currents in the range of 10 mA/cm2 obtained by adsorbing chiral molecules on a well-established Fe3O4 nanoparticle (NP) catalyst deposited on the anode. The results indicate a new strategy for designing low-cost earth-abundant catalysts where the advantages of the CISS effect are combined with the large effective area provided by the NPs to promote PEC water splitting with high current density.
中文翻译：
手性分子包覆的Fe 3 O 4纳米颗粒增强的电化学水分解
光电化学（PEC）分解水是一种从水中产生氢的有前途的方法。为了提高PEC的水分解效率，必须抑制过氧化氢副产物的产生并减少廉价催化剂和高电流密度所需的过电势。过去，显示出用手性分子或手性膜涂覆TiO 2电极可提高氢的产生并减少H 2 O 2副产物的产生。这被解释为是手性诱导的自旋选择性（CISS）效应的结果，该效应引起转移到阳极的电子之间的自旋相关性。但是，这些研究中观察到的电流通常在1–100μA/ cm 2的范围内。在这里，我们报告通过将手性分子吸附在沉积在阳极上的完善的Fe 3 O 4纳米颗粒（NP）催化剂上而获得的10 mA / cm 2范围内的电流。结果表明，设计低成本低成本地球富集催化剂的新策略将CISS效果的优点与NP提供的大有效面积相结合，以高电流密度促进PEC水的分解。
更新日期：2018-09-04
中文翻译：
手性分子包覆的Fe 3 O 4纳米颗粒增强的电化学水分解
光电化学（PEC）分解水是一种从水中产生氢的有前途的方法。为了提高PEC的水分解效率，必须抑制过氧化氢副产物的产生并减少廉价催化剂和高电流密度所需的过电势。过去，显示出用手性分子或手性膜涂覆TiO 2电极可提高氢的产生并减少H 2 O 2副产物的产生。这被解释为是手性诱导的自旋选择性（CISS）效应的结果，该效应引起转移到阳极的电子之间的自旋相关性。但是，这些研究中观察到的电流通常在1–100μA/ cm 2的范围内。在这里，我们报告通过将手性分子吸附在沉积在阳极上的完善的Fe 3 O 4纳米颗粒（NP）催化剂上而获得的10 mA / cm 2范围内的电流。结果表明，设计低成本低成本地球富集催化剂的新策略将CISS效果的优点与NP提供的大有效面积相结合，以高电流密度促进PEC水的分解。
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