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SnO2 QDs@CoFe2O4 NPs as an efficient electrocatalyst for methanol oxidation and oxygen evolution reactions in alkaline media
Journal of Electroanalytical Chemistry ( IF 4.1 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jelechem.2020.114363
T.V.M. Sreekanth , Nguyen Dang Nam , J. Kim , K. Yoo

Abstract We successfully decorated SnO2 quantum dots (SQDs) on the surface of spinel cobalt ferrite (CFO) at room temperature by cost-effective method. Pristine CFO and CFO nanocomposites (CFO-Sn1 and CFO-Sn2) were used as an electrocatalyst for methanol oxidation reaction (MOR) and oxygen evolution reaction (OER). CFO-Sn2 led to superior MOR and OER in alkaline media owing to the improved conductivity and higher electrochemically active surface area compared to the pristine CFO and CFO-Sn1. CFO-Sn2 exhibited the highest anodic peak intensity (Ipc) for MOR and significant peak separation upto 4.0 M concentration of MeOH. CFO-Sn2 exhibited the lowest overpotential value of 290 mV at 10 mA cm−2 vs RHE for OER, which was the highest among the electrocatalyst, and a Tafel slope of 85 mV/dec.

中文翻译:

SnO2 QDs@CoFe2O4 NPs作为碱性介质中甲醇氧化和析氧反应的有效电催化剂

摘要 我们通过低成本的方法在室温下成功地在尖晶石钴铁氧体 (CFO) 表面装饰了 SnO2 量子点 (SQD)。原始的 CFO 和 CFO 纳米复合材料(CFO-Sn1 和 CFO-Sn2)被用作甲醇氧化反应 (MOR) 和析氧反应 (OER) 的电催化剂。由于与原始 CFO 和 CFO-Sn1 相比,CFO-Sn2 具有更高的导电性和更高的电化学活性表面积,因此在碱性介质中具有优异的 MOR 和 OER。CFO-Sn2 表现出最高的 MOR 阳极峰强度 (Ipc) 和高达 4.0 M 甲醇浓度的显着峰分离。CFO-Sn2 在 10 mA cm-2 相对于 RHE 的 OER 下表现出最低的过电位值 290 mV,这是电催化剂中最高的,并且 Tafel 斜率为 85 mV/dec。
更新日期:2020-09-01
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