首页|Electrocatalytic Activities of Trirutiles Based on MTaO_6 (M=Co, Ni, Mg) for Oxygen Reduction Reaction
Electrocatalytic Activities of Trirutiles Based on MTaO_6 (M=Co, Ni, Mg) for Oxygen Reduction Reaction
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NETL
NSTL
Trans Tech Publications Ltd
The trirulile oxides MTa_2O_6 (M=Co,Ni,Mg) [MTs] and the substitution products M_(1-x)N_xTa_(2-y)L_yO_6 (N=Mn, L=Sn,Ti,Zr) [M_(1-x)N_xTa_(2-y)L_y] were prepared by a conventional solid-state reaction. The oxygen reduction reaction (ORR) activities were evaluated with the onset potentials (E_(on)) of the ORR currents, the disk current densities (i_D) and the efficiencies (Eff_4) of 4-electron reduction, measured by a rotating ring-disk electrode (RRDE) technique. All the samples showed ORR activities and the E_(on) values were around +0.8 V vs. RHE in 0.1 M KOH. The CoTa_2O_6 electrocatalyst showed the best ORR property of the MTs samples: its Eff_4 value was as high as -80%. With substitution of Ti or Sn, the ORR activities of MgTa_(1.9)T_(0.1)O_6, CoTa_(1.8)Sn_(0.2)O_6 and NiTa_(1.9)Ti_(0.1)O_6 were improved in alkaline solution, compared with those of MTa_2O_6. In acid solution, the same substitution of Ti and Sn resulted in improvement of Eff_4, but no significant improvements of E_(on) and i_D.
NETL
NSTL
Trans Tech Publications Ltd
