Lattice modulation strategy toward efficient and durable RuO2-based catalysts for acidic water oxidation

IF 3.5 3区工程技术 Q2 ENGINEERING, CHEMICAL

AIChE Journal Pub Date : 2024-12-08 DOI:10.1002/aic.18665

Linkai Han, Zhonghua Xiang

引用次数: 0

Abstract

Rutile RuO₂ is recognized for its outstanding acidic oxygen evolution reaction (OER) activity and notable cost advantage compared to iridium oxide for proton exchange membrane water electrolyzers (PEMWEs). However, the unsatisfactory stability of RuO₂ hinders its practical application. Here, we report a lattice modulation strategy to enhance both the OER activity and stability of RuO₂. Interestingly, the newly synthesized Mo_0.15Nb_0.05-RuO₂, with Mo doped first and then Nb, presents the greatest lattice spacing and possesses an overpotential of merely 205 mV at 10 mA cm⁻², which significantly outperforms Nb_0.05Mo_0.15-RuO₂ (239 mV), where Nb was doped first followed by Mo, as well as the initial RuO₂ (323 mV). Remarkably, Mo_0.15Nb_0.05-RuO₂ requires only 1.76 V to achieve 1 A cm⁻² and exhibits exceptional stability in PEMWE testing, with a voltage rise of only 58 mV at 200 mA cm⁻² for more than 80 h.

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晶格调制策略制备高效耐用的酸性水氧化钌基催化剂

与氧化铱相比，金红石RuO2因其出色的酸性析氧反应（OER）活性和显著的成本优势而被认可用于质子交换膜水电解槽（PEMWEs）。然而，若o2的稳定性不理想，阻碍了它的实际应用。在这里，我们报告了一种晶格调制策略来提高RuO2的OER活性和稳定性。有趣的是，新合成的先掺杂Mo后掺杂Nb的Mo0.15Nb0.05-RuO2具有最大的晶格间距，并且在10 mA cm−2下具有仅为205 mV的过电位，显著优于先掺杂Nb后掺杂Mo的Nb0.05Mo0.15-RuO2 （239 mV）和初始的RuO2 （323 mV）。值得注意的是，Mo0.15Nb0.05-RuO2只需要1.76 V就可以达到1 A cm - 2，并且在PEMWE测试中表现出优异的稳定性，在200 mA cm - 2下电压上升仅为58 mV，持续时间超过80小时。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

AIChE Journal 工程技术-工程：化工

CiteScore

7.10

自引率

10.80%

发文量

411

审稿时长

3.6 months

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