One-step synthesis of carbon-onion-supported PtCo alloy by underwater arc discharge for pH-universal hydrogen evolution reaction

IF 8.6 2区 工程技术 Q1 ENERGY & FUELS Sustainable Materials and Technologies Pub Date : 2024-10-29 DOI:10.1016/j.susmat.2024.e01160
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Abstract

Exploring low-cost and highly efficient electrocatalysts for pH-universal hydrogen evolution reaction (HER) is critical for the development of hydrogen energy conversion but challenging. In this study a novel catalyst of well-dispersed PtCo alloy nanoparticles with a size of ∼2 nm anchored on carbon nano onions (CNOs) has been constructed by a one-step underwater arc discharge method. The optimized Pt0.91Co0.09@CNOs catalyst with a Pt loading of 17.5 wt% and Co loading of 0.54 wt% exhibits excellent HER performances with overpotentials of 24 mV, 15 mV and 39 mV at the current density of 10 mA cm−2, and 137 mV, 108 mV and 63 mV at 100 mA cm−2 in alkaline, neutral, and acidic electrolytes, respectively, as well as superior continuous stability. Density functional theory calculations indicate the formation of PtCo nano alloy is beneficial for the modulation of the electron structure of catalysts, and thus presents a moderate H* adsorption energy and d-band center. This work provides a simple and economical strategy on constructing efficient alloy catalysts for pH-universal HER and offers an opportunity for the real-world application of hydrogen energy conversions.

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利用水下电弧放电一步合成碳离子支撑的铂钴合金,用于 pH 值通用氢进化反应
探索低成本、高效的 pH 值通用氢进化反应(HER)电催化剂对于氢能转换的发展至关重要,但也极具挑战性。本研究采用一步水下电弧放电法,构建了一种新型催化剂,该催化剂由锚定在碳纳米管(CNOs)上的分散良好的铂钴合金纳米颗粒(尺寸为 2 纳米)组成。优化后的 Pt0.91Co0.09@CNOs 催化剂的铂负载量为 17.5 wt%,钴负载量为 0.54 wt%,在碱性、中性和酸性电解质中,电流密度为 10 mA cm-2 时的过电位分别为 24 mV、15 mV 和 39 mV,电流密度为 100 mA cm-2 时的过电位分别为 137 mV、108 mV 和 63 mV,并且具有优异的连续稳定性。密度泛函理论计算表明,铂钴纳米合金的形成有利于调节催化剂的电子结构,从而呈现出适度的 H* 吸附能和 d 带中心。这项工作为构建 pH 值通用的高效合金催化剂提供了一种简单而经济的策略,并为氢能转换的实际应用提供了机会。
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来源期刊
Sustainable Materials and Technologies
Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment
CiteScore
13.40
自引率
4.20%
发文量
158
审稿时长
45 days
期刊介绍: Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.
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