Four-functional iron/copper sulfide heterostructure for alkaline hybrid zinc batteries and water splitting

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2023-02, Vol.457, p.141357, Article 141357
• Main Authors: Dang, Jiaxin, Yin, Mingming, Pan, Dianhui, Tian, Ziqi, Chen, Genman, Zou, Jiaqun, Miao, He, Wang, Qin, Yuan, Jinliang
• Format: Article
• Language: English
• Subjects: Alkaline hybrid zinc batteries; Ion conversion reactions; Iron/copper sulfides; Oxygen catalysis; Water splitting
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2023.141357

[Display omitted] •Four-functional INF-FeCuS heterostructure is developed by a facile one-step method.•INF-FeCuS shows the remarkable ORR/OER/HER catalytic performances and ion conversion properties.•AHZB with INF-FeCuS shows the superior charge–discharge properties and cyclic stability.•A single AHZB with INF-FeCuS can drive the electrolyzer with both INF-FeCuS electrodes. Developing the tri-functional catalysts to facilitate the oxygen evolution, oxygen reduction and hydrogen evolution reactions (OER, ORR and HER) is meaningful for zinc-air batteries (ZABs) and water splitting. Herein, we construct a novel metal sulfide heterostructure (INF-FeCuS) composed of Cu7S4 and Fe0.95S1.05. INF-FeCuS exhibits the superior tri-functional catalytic property with the OER, ORR and HER potentials of 1.45 V at 100 mA cm−2, 0.68 V at 10 mA cm−2, 292 mV at 100 mA cm−2 respectively. INF-FeCuS with a high ion conversion ability also can be used in the alkaline zinc battery with a discharge specific capacity of 446.0 mAh/g. Using the four-functional INF-FeCuS, we can fabricate a new-type of alkaline hybrid zinc battery (AHZB) with a peak power density of 203.4 mW cm−2 and energy efficiency of over 70 %. Interestingly, a single AHZB with INF-FeCuS can drive the electrolyzer with INF-FeCuS to produce hydrogen.