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Tunable Catalytic Performance on Iridium Clusters-Interspersed CoxSy-CoO Nanosheet-Built Hollows for Enhanced Water
Tran Thien An Nguyen1, Khoa Dang Tran1, Duy Thanh Tran1
1Department of Nano Convergence Engineering, Jeonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea.
Abstract:
To reach sustainable and robust green hydrogen energy production, the development of effective and long-lasting electrocatalysts for hydrogen and oxygen evolution reactions (HER and OER) during overall electrochemical water splitting is a critical requirement. In this study, a novel hierarchical nanosheet-based hollow heterostructure of CoxSy-CoO integrated with active iridium clusters (IrCs-CoxSy-CoO) is prepared by a straightforward chemical synthesis approach. The heterostructure offers extensive tunnels, and abundant mesopores, and features a high-density active site at the interfaces, thus greatly improving the overall catalytic performance through the promotion of synergistic effects. The IrCs-CoxSy-CoO catalyst demonstrates low overpotentials of 97 mV for HER and 243 mV for OER at 10 mA cm-2, showcasing remarkable stability and efficiency. The two-electrode cell test demonstrates reliable current response of 10 mA cm-2 at voltage of 1.497 and 1.58 V at temperature of 75 and 25 °C, respectively. Furthermore, the IrCs-CoxSy-CoO catalyst exhibits enhanced durability and performance when compared to the Pt/C(-)//RuO2(+). In practical application, significant current of 0.5/1.0 A cm-2 at 1.8/1.97 V has been achieved in an anion exchange membrane electrolyzer stack, while maintaining high efficiency (68%) and exceptional stability (over 500 h), underscoring the promising potential for sustainable H2 energy production.
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