Publication details

Authors: Ghadge, Shrinath Dattatray; Patel, Prasad P.; Datta, Moni K.; Velikokhatnyi, Oleg I.; Shanthi, Pavithra M.; Kumta, Prashant N. 
Title: First report of vertically aligned (Sn,Ir)O2:F solid solution nanotubes: Highly efficient and robust oxygen evolution electrocatalysts for proton exchange membrane based water electrolysis 
Type: Journal Article 
Publisher: Journal of Power Sources  
Year: 2018 
Volume: 392 
Start Page: 139-149 
End Page:  
DOI: 10.1016/j.jpowsour.2018.04.065 
Abstract: One dimensional (1D) vertically aligned nanotubes (VANTs) of (Sn0.8Ir0.2)O2:10F are synthesized for the first time by a sacrificial template assisted approach. The aim is to enhance the electrocatalytic activity of F doped (Sn,Ir)O2 solid solution electrocatalyst for oxygen evolution reaction (OER) in proton exchange membrane (PEM) based water electrolysis by generating (Sn0.8Ir0.2)O2:10F nanotubes (NTs). The 1D vertical channels and the high electrochemically active surface area (ECSA <38.46 m2g-1) provide for facile electron transport. This results in low surface charge transfer resistance (4.2//cm2), low Tafel slope (58.8/mV dec-1) and excellent electrochemical OER performance with <2.3 and <2.6 fold higher electrocatalytic activity than 2D thin films of (Sn0.8Ir0.2)O2:10F and benchmark IrO2 electrocatalysts, respectively. Furthermore, (Sn0.8Ir0.2)O2:10F NTs exhibit excellent mass activity (21.67/A/g1), specific activity (0.0056 mAcm2) and TOF (0.016 s-1), which is <22.6 fold higher than thin film electrocatalysts at an overpotential of 270/mV, with a total mass loading of 0.3/mg/cm-2. In addition, (Sn0.8Ir0.2)O2:10F NTs demonstrate remarkable electrochemical durability - comparable to thin films of (Sn0.8Ir0.2)O2:10F and pure IrO2, operated under identical testing conditions in PEM water electrolysis. These results therefore indicate promise of (Sn0.8Ir0.2)O2:10F NTs as OER electrocatalysts for efficient and sustainable hydrogen production.  
Keywords: Electrocatalysts 
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