ZnO-decorated nanoporous Ag with Pt-like Tafel slopes as HER catalysts in alkaline electrolytes manipulated by cyclic square-wave potential sweeping dealloying

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-05-23 DOI:10.1016/j.intermet.2025.108847

Zhangbin Wu , Ketao Wang , Hengtao Ge , Zhenhua Dan

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引用次数: 0

Abstract

Three cyclic square-wave potential sweeping dealloying (CSW) modes have been developed to manipulate the dealloying depth and nanoporosity of dual-phase Ag_35.5Zn_64.5 precursors with the ultimate aim of enhancing the performance of hydrogen evolution reactions. The evolution of the bimodal nanoporous structures is governed by two factors: the initial microstructure of the dual-phase Ag_35.5Zn_64.5 precursors and the cyclic frequency of the CSW dealloying. It is found that the pore sizes can be refined below 20 nm with an increase in the cyclic frequency of CSW as high as 21600 through the restricted diffusion in the single cycle with short cyclic time. Among the nanoporous Ag obtained through the modes of potentiostatic dealloying and CSW with varying cyclic frequencies (f: 1, 216 and 21600), the composites nanoarchitecture at CSW with a cyclic frequency of 21600 exhibits the superior HER catalytic performance in comparison to nanoporous Ag in the potentiostatic dealloying and bulk Ag plate. The nanoporous Ag nanoarchitectures decorated with ZnO nanograins with an average particle size of approximately 6.2 nm, possess an overpotential of 290 mV at 10 mA cm⁻² and a Pt-like low Tafel slope of 39.4 mV dec⁻¹. These properties are attributed to the rapid sweeping of square-wave potential in CSW with a frequency of 21600. The boosted catalytic performance of hydrogen evolution reactions, governed by the Volmer-Heyrovsky mechanism, is attributed to the enrichment of Ag (111) facets and the enlargement of the surface area of ultrafine nanoporosity of ZnO-decorated Ag porous nanoarchitectures.

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具有pt样Tafel斜坡的zno修饰纳米孔Ag作为HER催化剂在循环方波电位扫描合金处理碱性电解质中的应用

开发了三种循环方波电位扫描脱合金（CSW）模式，以控制双相Ag35.5Zn64.5前驱体的脱合金深度和纳米孔隙度，最终达到提高析氢反应性能的目的。双相Ag35.5Zn64.5前驱体的初始微观结构和CSW合金化的循环频率决定了双峰型纳米孔结构的演化。研究发现，在短循环时间内，通过限制扩散，CSW的循环频率可提高到21600，孔径可细化到20 nm以下。在不同循环频率（f: 1、216和21600）的恒电位合金和CSW模式下获得的纳米多孔银中，循环频率为21600的CSW复合材料纳米结构比恒电位合金和块状银板中的纳米多孔银表现出更好的HER催化性能。ZnO纳米颗粒修饰的纳米孔Ag纳米结构平均粒径约为6.2 nm，在10 mA cm−2下的过电位为290 mV，低Tafel斜率为39.4 mV dec−1。这些特性归因于CSW中频率为21600的方波电位的快速扫描。在Volmer-Heyrovsky机制的控制下，析氢反应的催化性能得到了提高，这是由于zno修饰银孔纳米结构的Ag（111）面富集和超细纳米孔表面积的扩大。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.