Sapner Vijay S, Mulik Balaji B, Digraskar Renuka V, Narwade Shankar S, Sathe Bhaskar R
Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University Aurangabad 431004 Maharashtra India
RSC Adv. 2019 Feb 22;9(12):6444-6451. doi: 10.1039/c8ra10286d.
Development of highly efficient oxygen evolution reaction (OER) electrocatalysts is a critical challenge in the cost-effective generation of clean fuels. Here, a metal-free tyramine functionalized graphene oxide (T-GO) electrocatalyst is proposed to use in alkaline electrolytes for enhanced OER. Moreover, the T-GO and GO nanomaterials are well characterized by SEM, XRD, FTIR, XPS and Raman spectroscopy. T-GO exhibits an electrocatalytic OER with a current density of 2 mA cm at a low onset potential of ∼1.39 V and a small Tafel slope of about 69 mV dec and GO exhibits an onset potential of 1.51 V and Tafel slope of about 92 mV dec. Additionally, the current stability and RRDE based diffusion controlled response of the T-GO electrocatalyst are outstanding compared to GO. This study establishes metal free T-GO as an efficient electrocatalyst for the OER and used for cathodic production of hydrogen as a counter reaction in the field of water splitting.
开发高效析氧反应（OER）电催化剂是经济高效地生产清洁燃料的一项关键挑战。在此，提出了一种无金属的酪氨酸官能化氧化石墨烯（T-GO）电催化剂，用于碱性电解质中以增强析氧反应。此外，通过扫描电子显微镜（SEM）、X射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）和拉曼光谱对T-GO和氧化石墨烯（GO）纳米材料进行了充分表征。T-GO在约1.39 V的低起始电位下表现出电流密度为2 mA cm的电催化析氧反应，塔菲尔斜率约为69 mV dec，而GO的起始电位为1.51 V，塔菲尔斜率约为92 mV dec。此外，与GO相比，T-GO电催化剂的电流稳定性和基于旋转环盘电极（RRDE）的扩散控制响应非常出色。本研究确立了无金属的T-GO作为一种高效的析氧反应电催化剂，并将其用于水分解领域中作为反向反应的阴极产氢。
