Laser-induced periodic surface structured electrodes with 45% energy saving in electrochemical fuel generation through field localization

IF 15.3 1区 物理与天体物理 Q1 OPTICS Opto-Electronic Advances Pub Date : 2021-12-13 DOI:10.29026/oea.2022.210105
C. S. Saraj, S. Singh, Gopal Verma, R. Rajan, Wei Li, Chunlei Guo
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引用次数: 4

Abstract

Electrochemical oxidation/reduction of radicals is a green and environmentally friendly approach to generate fuels. These reactions, however, suffer from sluggish kinetics due to a low local concentration of radicals around the electrocatalyst. A large electrode potential can enhance the fuel generation efficiency via enhancing the radical concentration around the electrocatalyst sites, but this comes at the cost of electricity. Here, we report about 45 % saving in energy to achieve an electrochemical hydrogen generation rate of 3×1016 molecules cm-2s-1 (current density: 10 mA/cm2) through localized electric field-induced enhancement in the reagent concentration (LEFIRC) at laser-induced periodic surface structured (LIPSS) electrodes. The finite element model is used to simulate the spatial distribution of the electric field to understand the effects of LIPSS geometric parameters in field localization. When the LIPSS patterned electrodes are used as substrates to support Pt/C and RuO2 electrocatalysts, the 10 overpotentials for HER and OER are decreased by 40 and 25 %, respectively. Moreover, the capability of the LIPSS-patterned electrodes to operate at significantly reduced energy is also demonstrated in a range of electrolytes including alkaline, acidic, neutral, and seawater. Importantly, when two LIPSS patterned electrodes were assembled as the anode and cathode into a cell, it requires 330 mVs of lower electric potential with enhanced stability over a similar cell made of pristine electrodes to drive a current density of 10 mA/cm2. This work demonstrates a physical and versatile approach of electrode surface patterning to boost electrocatalytic fuel generation performance and can be applied to any metal and semiconductor catalysts for a range of electrochemical reactions.
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激光诱导周期性表面结构电极,通过场定位实现电化学燃料发电节能45%
自由基的电化学氧化/还原是一种绿色环保的燃料生产方法。然而,由于电催化剂周围自由基的低局部浓度,这些反应的动力学缓慢。大的电极电势可以通过提高电催化剂位点周围的自由基浓度来提高燃料产生效率,但这是以电为代价的。在这里,我们报道了通过在激光诱导的周期性表面结构(LIPSS)电极处的局部电场诱导的试剂浓度(LEFIRC)的增强,实现3×1016分子cm-2s-1(电流密度:10mA/cm2)的电化学氢生成率,从而节省了约45%的能量。有限元模型用于模拟电场的空间分布,以了解LIPSS几何参数在场定位中的影响。当LIPSS图案化电极用作支撑Pt/C和RuO2电催化剂的衬底时HER和OER的10个过电位分别降低了40%和25%。此外,在包括碱性、酸性、中性和海水在内的一系列电解质中,也证明了LIPSS图案化电极在显著降低的能量下工作的能力。重要的是,当将两个LIPSS图案化电极作为阳极和阴极组装到电池中时,与由原始电极制成的类似电池相比,需要330mV的较低电势和增强的稳定性来驱动10mA/cm2的电流密度。这项工作展示了一种物理和通用的电极表面图案化方法,以提高电催化燃料生成性能,并可应用于任何金属和半导体催化剂,用于一系列电化学反应。
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来源期刊
CiteScore
19.30
自引率
7.10%
发文量
128
期刊介绍: Opto-Electronic Advances (OEA) is a distinguished scientific journal that has made significant strides since its inception in March 2018. Here's a collated summary of its key features and accomplishments: Impact Factor and Ranking: OEA boasts an impressive Impact Factor of 14.1, which positions it within the Q1 quartiles of the Optics category. This high ranking indicates that the journal is among the top 25% of its field in terms of citation impact. Open Access and Peer Review: As an open access journal, OEA ensures that research findings are freely available to the global scientific community, promoting wider dissemination and collaboration. It upholds rigorous academic standards through a peer review process, ensuring the quality and integrity of the published research. Database Indexing: OEA's content is indexed in several prestigious databases, including the Science Citation Index (SCI), Engineering Index (EI), Scopus, Chemical Abstracts (CA), and the Index to Chinese Periodical Articles (ICI). This broad indexing facilitates easy access to the journal's articles by researchers worldwide. Scope and Purpose: OEA is committed to serving as a platform for the exchange of knowledge through the publication of high-quality empirical and theoretical research papers. It covers a wide range of topics within the broad area of optics, photonics, and optoelectronics, catering to researchers, academicians, professionals, practitioners, and students alike.
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