A strongly coupled Pt-W2N heterostructure embedded in porous carbon nanoflowers for seawater electrolysis

IF 7.4 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Science China Materials Pub Date : 2025-07-29 DOI:10.1007/s40843-025-3454-7

Zhiyuan Liu (, ), Lulu Chen (, ), Sixuan Huang (, ), Meiqi Liu (, ), Qiming Ye (, ), Yichao Huang (, )

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引用次数: 0

Abstract

Constructing heterostructures with favorable catalytic activities is crucial for improving the seawater electrolysis. Herein, we report a strongly coupled Pt-W₂N heterostructure embedded within porous conductive carbon nanoflowers (Pt-W₂N@C) as a highly efficient and durable cathode electrocatalyst for seawater electrolysis. Through in situ Raman spectroscopy and electrochemical analysis, we elucidate that the Pt-W₂N@C system leverages synergistic electronic interactions at the heterointerface to concurrently optimize the adsorption of H* and OH* intermediates while enhancing water dissociation kinetics. The optimized Pt-W₂N@C catalyst exhibits superior hydrogen evolution reaction (HER) performance across acidic, neutral, and alkaline electrolytes, achieving overpotentials of 1.2, 7, and 32.2 mV, respectively, at 10 mA cm⁻², significantly outperforming commercial 20 wt% Pt/C benchmarks. Notably, the Pt-W₂N@C catalyst exhibits exceptional performance in alkaline seawater electrolysis, achieving ultra-low HER overpotential (163.8 mV at 700 mA cm⁻²) alongside superior chloride tolerance and HER performance under 0.5–2.5 M NaCl. Remarkably, in a practical seawater electrolyzer (Pt-W₂N@C∥ NiFe-layered double hydroxide (LDH)), it requires only 1.992 V to drive 500 mA cm⁻² while maintaining 95.8% activity retention over 80 h of continuous operation. These findings highlight the advantages of heterostructures and their cooperative effects in designing next-generation electrocatalysts for practical seawater electrolysis.

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多孔碳纳米花中嵌入的强耦合Pt-W2N异质结构用于海水电解

构建具有良好催化活性的异质结构是提高海水电解性能的关键。在此，我们报道了嵌入多孔导电碳纳米花（Pt-W2N@C）中的强耦合Pt-W2N异质结构作为海水电解的高效耐用阴极电催化剂。通过原位拉曼光谱和电化学分析，我们阐明了Pt-W2N@C体系利用异质界面上的协同电子相互作用，同时优化了H*和OH*中间体的吸附，同时增强了水的解离动力学。优化后的Pt-W2N@C催化剂在酸性、中性和碱性电解质中表现出优异的析氢反应（HER）性能，在10 mA cm - 2下分别达到1.2、7和32.2 mV的过电位，显著优于20 wt% Pt/C的商业基准。值得注意的是，Pt-W2N@C催化剂在碱性海水电解中表现出优异的性能，具有超低的HER过电位（在700 mA cm−2时为163.8 mV），以及卓越的氯化物耐受性和0.5-2.5 M NaCl下的HER性能。值得注意的是，在实际的海水电解槽（Pt-W2N@C∥nfe层状双氢氧化物（LDH））中，仅需要1.992 V就可以驱动500 mA cm - 2，同时在连续运行80小时内保持95.8%的活性保持。这些发现突出了异质结构及其协同效应在设计新一代实际海水电解电催化剂中的优势。

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来源期刊

Science China Materials Materials Science-General Materials Science

CiteScore

11.40

自引率

7.40%

发文量

949

期刊介绍： Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.