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Metal-organic frameworks derived Ag-CoSO4 nanohybrids as efficient electrocatalysts for oxygen evolution reaction
Qianwang Chen
Author NameAffiliationE-mail
Qianwang Chen 中国科大材料系 cqw@ustc.edu.cn 
Abstract:
Cobalt-based nanomaterials have been intensively explored as one of the most promising noble-metal-free oxygen evolution reaction (OER) electrocatalysts. However, most of their performances are still inferior to state-of-the-art precious metals especially for Ru and Ir. Herein, we apply a continuous ion exchange method and further hydrothermal treatment to synthesize flake-like Ag-CoSO4 nanohybrids beginning from Co-BTC metal-organic frameworks (MOFs) precursor. The catalyst exhibits superior OER performance under the alkaline electrolyte solution (a low overpotential of 282 mV at 10 mA cm?2 in 1M KOH), which is even better than RuO2 due to the improved conductivity and rapid electrons transfer process via introducing small amount of Ag. The existence of Ag in the hybrids is beneficial for increasing the Co (IV) concentration thus promoting the *OOH intermediate formation process. Besides, due to the very low requirement of Ag content (lower than 1 atom%), the cost of the catalyst is also limited. This work provides a new insight for designing of inexpensive OER catalysts with high performance and low cost.
Key words:  metal-organic frameworks,Ag-CoSO4,oxygen evolution reaction,electrons transfer
FundProject:
Metal-organic frameworks derived Ag-CoSO4 nanohybrids as efficient electrocatalysts for oxygen evolution reaction
陈乾旺
摘要:
Cobalt-based nanomaterials have been intensively explored as one of the most promising noble-metal-free oxygen evolution reaction (OER) electrocatalysts. However, most of their performances are still inferior to state-of-the-art precious metals especially for Ru and Ir. Herein, we apply a continuous ion exchange method and further hydrothermal treatment to synthesize flake-like Ag-CoSO4 nanohybrids beginning from Co-BTC metal-organic frameworks (MOFs) precursor. The catalyst exhibits superior OER performance under the alkaline electrolyte solution (a low overpotential of 282 mV at 10 mA cm?2 in 1M KOH), which is even better than RuO2 due to the improved conductivity and rapid electrons transfer process via introducing small amount of Ag. The existence of Ag in the hybrids is beneficial for increasing the Co (IV) concentration thus promoting the *OOH intermediate formation process. Besides, due to the very low requirement of Ag content (lower than 1 atom%), the cost of the catalyst is also limited. This work provides a new insight for designing of inexpensive OER catalysts with high performance and low cost.
关键词:  metal-organic frameworks,Ag-CoSO4,oxygen evolution reaction,electrons transfer
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