Hierarchically porous nanoarchitecture constructed by ultrathin CoSe2 embedded Fe-CoO nanosheets as robust electrocatalyst for water oxidation

• 作者: Manigandan Ramadoss Yuanfu Chen Yang Hu Bin Wang Ramkumar Jeyagopal Karpuraranjith Marimuthu Xinqiang Wang Dongxu Yang
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2021,（19）
• 页码范围: 229-237
• 页数: 9页
• 语种: 英文

摘要

The sluggish kinetics and high cost of the noble-metal based electrocatalyst for oxygen evolution reaction(OER)still seriously limits the efficiencies of water splitting.Herein,for the first time,we rationally design a porous hierarchical nanoarchitecture,constructed by ultrathin CoSe2 embedded Fe-CoO nanosheets(CoSe2@Fe-CoO),which is synthesized via self-assembly hydrolysis driven in-situ synergetic selenization of Fe/Co/O/Se precursor followed by Ostwald ripening.As an OER catalyst,the porous CoSe2@Fe-CoO hybrid with abundant CoOOH electroactive sites delivers a small Tafel of 56.2 mV/dec with very low onset overpotential of 280 mV@10 mA/cm2 and excellent long-term physicochemical stability till 62 h without obvious decay,which outperforms well-established benchmark electrocatalysts(RuO2).The boosted OER performance of CoSe2@Fe-CoO nanosheets is mainly attributed to its iron-doping effect,porous nanoarchitecture,and multicomponent synergetic/interfacial effect between ultrathin cobalt(Ⅱ)oxide and conductive cobalt selenide(CoSe2)nanoframework.This work presents a facile construction strategy to find a nonprecious hybrid OER electrocatalyst with excellent performance and long-term stability.