Durable, pure water–fed, anion-exchange membrane electrolyzers through interphase engineering

IF 45.8 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-10-16 DOI:10.1126/science.adw7100

Shujin Hou, Archana Sekar, Yang Zhao, Minkyoung Kwak, Juhyun Oh, Kelvin Kam-Yun Li, Peiyao Wu, Ryan T. Hannagan, Valeria Cartagena, Anthony C. Ekennia, Hui Duan, Michael J. Zachman, Joelle Frechette, Gregory M. Su, Balsu Lakshmanan, Yushan Yan, Thomas F. Jaramillo, Shannon W. Boettcher

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引用次数: 0

Abstract

Anion-exchange membrane water electrolyzers (AEMWEs) promise scalable, low-cost hydrogen production but are limited by the electrochemical instability of their anode ionomers. We report interphase engineering using inorganic-containing molecular additives that coassemble with ionomer, enabling pure water–fed AEMWEs to operate with a degradation rate <0.5 millivolt per hour at 2.0 amperes per square centimeter and 70°C—a >20-fold durability improvement. Analysis of different additives and ionomers shows that the stabilization mechanism involves cross-links between metal oxo/hydroxo oligomers and ionomers. Under operation, the inorganic additive enriches, forming an interphase near the water-oxidation catalyst that passivates the anode ionomer against continuous degradation while maintaining mechanical integrity and hydroxide conductivity. This additive-based interphase-engineering strategy provides a path to durable AEMWEs that operate without supporting electrolytes and is adaptable across diverse catalysts and ionomers for electrochemical technologies.

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耐用，纯水，阴离子交换膜电解槽通过间相工程

阴离子交换膜水电解槽（AEMWEs）有望大规模、低成本地制氢，但其阳极离聚体的电化学不稳定性限制了它的发展。我们报告了使用含无机分子添加剂与离子聚体组合的间相工程，使纯水AEMWEs在2.0安培/平方厘米和70°c下以0.5毫伏/小时的降解速率运行，耐久性提高了20倍。对不同添加剂和离聚物的分析表明，金属氧/羟基低聚物与离聚物之间的交联是稳定机理。在运行过程中，无机添加剂富集，在水氧化催化剂附近形成界面相，使阳极离聚体钝化，防止持续降解，同时保持机械完整性和氢氧化物导电性。这种基于添加剂的相间工程策略为制造耐用的AEMWEs提供了一条途径，这种AEMWEs无需辅助电解质即可运行，并且适用于各种催化剂和电化学技术的离子聚合物。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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