Evaluation of the photoelectrochemical properties of mono and dual single-atom catalysts

IF 2.6 4区化学 Q3 ELECTROCHEMISTRY Journal of Solid State Electrochemistry Pub Date : 2024-08-06 DOI:10.1007/s10008-024-06029-8

Sirlon F. Blaskievicz, Ivo F. Teixeira, Lucia H. Mascaro

引用次数: 0

Abstract

Herein, we prepared poly(heptazine imide) (PHI), a layered structure of carbon nitride material containing sodium cations that were later exchanged, allowing us to obtain single-atom catalyst (SAC) sites of nickel, cobalt, and iron. In addition, combinations among these metals (NiCo, NiFe, and CoFe) were evaluated as dual single-atom catalysts (DSAC). The samples containing transition metal presented a photocurrent response far superior to the unmodified Na-PHI. The maximum photocurrent obtained was for the sample NiCo-PHI in alkaline media, being ~ 70 µA cm⁻² at 1.2 V vs. RHE; this value was higher than both Ni-PHI and Co-PHI combined, indicative of a cooperative effect in the DSAC sample. Lastly, all samples containing transition metal, when studied in acidic media, presented both cathodic and anodic photocurrent indicating a bifunctionality potential for application in both reduction and oxidation of water.

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评估单原子和双原子单原子催化剂的光电化学特性

在此，我们制备了聚庚嗪亚胺（PHI），这是一种含有钠阳离子的氮化碳材料的层状结构，经过交换后，我们获得了镍、钴和铁的单原子催化剂（SAC）位点。此外，我们还将这些金属（镍钴、镍铁和钴铁）的组合作为双单原子催化剂（DSAC）进行了评估。含有过渡金属的样品的光电流响应远远优于未改性的 Na-PHI。在碱性介质中，NiCo-PHI 样品获得的光电流最大，在 1.2 V 相对于 RHE 时约为 70 µA cm-2；该值高于 Ni-PHI 和 Co-PHI 的总和，表明 DSAC 样品具有协同效应。最后，在酸性介质中研究所有含有过渡金属的样品时，它们都显示出阴极和阳极光电流，这表明它们具有双功能潜力，可同时应用于水的还原和氧化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Solid State Electrochemistry 工程技术-电化学

CiteScore

4.80

自引率

4.00%

发文量

227

审稿时长

4.1 months

期刊介绍： The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.