Engineering eg filling of RuO2 enables a robust and stable acidic water oxidation

IF 9.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY Chinese Chemical Letters Pub Date : 2024-11-05 DOI:10.1016/j.cclet.2024.110612

Qing Li , Yumei Feng , Yingjie Yu , Yazhou Chen , Yuhua Xie , Fang Luo , Zehui Yang

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Abstract

Efficient and stable electrocatalyst for oxygen evolution reaction (OER) in acidic environment is vital for polymer electrolyte membrane water electrolysis (PEMWE). In this work, we have devised the formation of heterostructured RuO₂/MnO₂ with nanoflower structure for acidic OER catalysis. Compared to commercial RuO₂, the overpotential at 50 mA/cm² is decreased by 36 mV, corresponding to a 3.7-fold better mass activity. The boosted acidic OER performance is attributed to the heterostructure inducing more electrons are filled in e_g orbital of Ru atom triggering a better deprotonation of bridge oxygen atom in Ru-O_bri-Mn structure evidenced by pH-independent cyclic voltammetry test. Moreover, RuO₂/MnO₂ sustains its acidic OER activity within 20 h, longer than commercial RuO₂. The membrane electrode assembly (MEA) test suggests than only 2.18 V is required to achieve a current density of 5 A/cm². The theoretical calculation reveals that the e_g filling of Ru atom is increased from 2.18 to 2.39 after MnO₂ incorporation, reducing the energy for the formation of *OOH moiety.

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来源期刊

Chinese Chemical Letters 化学-化学综合

CiteScore

14.10

自引率

15.40%

发文量

8969

审稿时长

1.6 months

期刊介绍： Chinese Chemical Letters (CCL) (ISSN 1001-8417) was founded in July 1990. The journal publishes preliminary accounts in the whole field of chemistry, including inorganic chemistry, organic chemistry, analytical chemistry, physical chemistry, polymer chemistry, applied chemistry, etc.Chinese Chemical Letters does not accept articles previously published or scheduled to be published. To verify originality, your article may be checked by the originality detection service CrossCheck.

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