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等离子处理碳纤维上的水莲花状铱

来源：花匠小妙招时间：2025-01-08 14:12

等离子处理碳纤维上的水莲花状铱-碳酸钴氢氧化物工程，用于增强电催化氧进化。

IF 4.3 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

摘要

碱性水电解过程中氧进化反应（OER）的缓慢动力学仍是开发高效电催化系统的一大挑战。在本研究中，我们提出了一种三维、微米级的氧化铱（IrO2）装饰碳酸钴氢氧化物（IrO2-P-CoCH）电催化剂，它是在经过常压介质阻挡放电（DBD）等离子体（PCC）预处理的碳布（CC）基底上原位设计的。这种电催化剂具有由纳米棒组成的花瓣状结构，提供了丰富的反应区域和位点，包括由空气-DBD 等离子体造成的氧空位。因此，IrO2-P-CoCH/PCC 电催化剂具有出色的 OER 性能，在 1.0 M KOH 中实现 10 mA cm-2 (j10) 和 300 mA cm-2 (j300) 的电流密度所需的过电位分别仅为 190 mV 和 300 mV，塔菲尔斜率低至 48.1 mV dec-1。值得注意的是，得益于暴露在 IrO2-P-CoCH (Ir) 异质结构上的丰富活性位点，IrO2 和 CoCH 之间的协同效应提高了电荷传输速率，与商业基准 RuO2/PCC (470 mV/j300)相比，IrO2-P-CoCH/PCC 在高电流密度（300 mV/j300）下表现出更高的电催化活性。此外，IrO2-P-CoCH/PCC 电催化剂显示出卓越的 OER 稳定性，在 100 小时测试中，电流密度为 j10 时仅降低 1.3%，超过了大多数基于 CC 基底的 OER 催化剂。这项研究为在柔性电极基底上设计高性能 OER 电催化剂提供了一种新方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Engineering Water-Lotus-like Iridium-Cobalt Carbonate Hydroxides on Plasma-Treated Carbon Fibers for Enhanced Electrocatalytic Oxygen Evolution.

The sluggish kinetics of the oxygen evolution reaction (OER) in alkaline water electrolysis remains a significant challenge for developing high-efficiency electrocatalytic systems. In this study, we present a three-dimensional, micrometer-sized iridium oxide (IrO2)-decorated cobalt carbonate hydroxide (IrO2-P-CoCH) electrocatalyst, which is engineered in situ on a carbon cloth (CC) substrate pretreated with atmospheric-pressure dielectric barrier discharge (DBD) plasma (PCC). The electrocatalyst features petal-like structures composed of nanosized rods, providing abundant reactive areas and sites, including the oxygen vacancy caused by the air-DBD plasma. As a result, the IrO2-P-CoCH/PCC electrocatalyst demonstrates an outstanding OER performance, with overpotentials of only 190 and 300 mV required to achieve current densities of 10 mA cm-2 (j10) and 300 mA cm-2 (j300), respectively, along with a low Tafel slope of 48.1 mV dec-1 in 1.0 M KOH. Remarkably, benefiting from rich active sites exposed on the IrO2-P-CoCH (Ir) heterostructure, the synergistic effect between IrO2 and CoCH enhances the charge delivery rates, and the IrO2-P-CoCH/PCC exhibits a superior electrocatalytic activity at a high current density (300 mV/j300) compared to the commercial benchmarked RuO2/PCC (470 mV/j300). Furthermore, the IrO2-P-CoCH/PCC electrocatalyst shows exceptional OER stability, with a mere 1.3% decrease with a current density of j10 for 100 h testing, surpassing most OER catalysts based on CC substrates. This work introduces a novel approach for designing high-performance OER electrocatalysts on flexible electrode substrates.

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来源期刊

Inorganic Chemistry

期刊介绍： Inorganic Chemistry publishes fundamental studies in all phases of inorganic chemistry. Coverage includes experimental and theoretical reports on quantitative studies of structure and thermodynamics, kinetics, mechanisms of inorganic reactions, bioinorganic chemistry, and relevant aspects of organometallic chemistry, solid-state phenomena, and chemical bonding theory. Emphasis is placed on the synthesis, structure, thermodynamics, reactivity, spectroscopy, and bonding properties of significant new and known compounds.