scholarly journals Inhibiting Surface Diffusion to Synthesize 3D Bicontinuous Nanoporous N‐Doped Carbon for Boosting Oxygen Reduction Reaction in Flexible All‐Solid‐State Al‐Air Batteries (Adv. Funct. Mater. 38/2021)

2021 ◽  
Vol 31 (38) ◽  
pp. 2170284
Author(s):  
Kailong Hu ◽  
Tingting Yu ◽  
Yanyi Zhang ◽  
Xiaorong Lin ◽  
Yilu Zhao ◽  
...  
Keyword(s):  
Solid State ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Surface Diffusion ◽  
Reduction Reaction

Electrocatalytic Activities of Trirutiles Based on MTaO6 (M=Co, Ni, Mg) for Oxygen Reduction Reaction

2009 ◽  
Vol 421-422 ◽  
pp. 459-462
Author(s):  
Takayuki Konishi ◽  
Hideki Kawai ◽  
Morihiro Saito ◽  
Jun Kuwano ◽  
Hidenobu Shiroishi
Keyword(s):  
Solid State ◽  
Acid Solution ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Disk Electrode ◽  
Conventional Solid State Reaction ◽  
Rotating Ring Disk Electrode ◽  
Current Densities ◽  
Electron Reduction

The trirutile oxides MTa2O6 (M=Co,Ni,Mg) [MTs] and the substitution products M1-xNxTa2-yLyO6 (N=Mn, L=Sn,Ti,Zr) [M1-xNxTa2-yLy] were prepared by a conventional solid-state reaction. The oxygen reduction reaction (ORR) activities were evaluated with the onset potentials (Eon) of the ORR currents, the disk current densities (iD) and the efficiencies (Eff4) of 4-electron reduction, measured by a rotating ring-disk electrode (RRDE) technique. All the samples showed ORR activities and the Eon values were around +0.8 V vs. RHE in 0.1 M KOH. The CoTa2O6 electrocatalyst showed the best ORR property of the MTs samples: its Eff4 value was as high as ~80%. With substitution of Ti or Sn, the ORR activities of MgTa1.9T0.1O6, CoTa1.8Sn0.2O6 and NiTa1.9Ti0.1O6 were improved in alkaline solution, compared with those of MTa2O6. In acid solution, the same substitution of Ti and Sn resulted in improvement of Eff4, but no significant improvements of Eon and iD.

Sign in / Sign up

Export Citation Format

Share Document