期刊论文详细信息
JOURNAL OF POWER SOURCES 卷:392
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
Article
Ghadge, Shrinath Dattatray1  Patel, Prasad P.1  Datta, Moni K.2,3  Velikokhatnyi, Oleg I.2,3  Shanthi, Pavithra M.1  Kumta, Prashant N.1,2,3,4,5 
[1] Univ Pittsburgh, Swanson Sch Engn, Chem & Petr Engn, Pittsburgh, PA 15261 USA
[2] Univ Pittsburgh, Swanson Sch Engn, Dept Bioengn, Pittsburgh, PA 15261 USA
[3] Univ Pittsburgh, Ctr Complex Engn Multifunct Mat, Pittsburgh, PA 15261 USA
[4] Univ Pittsburgh, Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA
[5] Univ Pittsburgh, Sch Dent Med, Pittsburgh, PA 15217 USA
关键词: Electrocatalysts;    PEM water electrolysis;    Oxygen evolution reaction;    Vertically aligned nanotubes;    Electrocatalytic activity;    Sustainable hydrogen production;   
DOI  :  10.1016/j.jpowsour.2018.04.065
来源: Elsevier
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【 摘 要 】

One dimensional (1D) vertically aligned nanotubes (VANTs) of (Sn0.8Ir0.2)O-2:10F 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)O-2 solid solution electrocatalyst for oxygen evolution reaction (OER) in proton exchange membrane (PEM) based water electrolysis by generating (Sn0.8Ir0.2)O-2:10F nanotubes (NTs). The 1D vertical channels and the high electrochemically active surface area (ECSA similar to 38.46 m(2)g(-1)) provide for facile electron transport. This results in low surface charge transfer resistance (4.2 Omega cm(2)), low Tafel slope (58.8 mV dec(-1)) and excellent electrochemical OER performance with similar to 2.3 and similar to 2.6 fold higher electrocatalytic activity than 2D thin films of (Sn0.8Ir0.2)O-2:10F and benchmark IrO2 electrocatalysts, respectively. Furthermore, (Sn0.8Ir0.2)O-2:10F NTs exhibit excellent mass activity (21.67 A g(-1)), specific activity (0.0056 mAcm(-2)) and TOF (0.016 s(-1)), which is similar to 2-2.6 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)O-2:10F NTs demonstrate remarkable electrochemical durability - comparable to thin films of (Sn0.8Ir0.2)O-2:10F and pure IrO2, operated under identical testing conditions in PEM water electrolysis. These results therefore indicate promise of (Sn0.8Ir0.2)O-2:10F NTs as OER electrocatalysts for efficient and sustainable hydrogen production.

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