TY - JOUR
T1 - Influence of Fe contamination and temperature on mechanically alloyed Co-Ni-Mo electrodes for hydrogen evolution reaction in alkaline water
AU - Domínguez-Crespo, M. A.
AU - Plata-Torres, M.
AU - Torres-Huerta, A. M.
AU - Ortiz-Rodríguez, I. A.
AU - Ramírez-Rodríguez, C.
AU - Arce-Estrada, E. M.
N1 - Funding Information:
Authors wish to thanks the financial support from CGPI-IPN, DGPA-UNAM, and CONACYT.
PY - 2006/3
Y1 - 2006/3
N2 - Ni-Co-Mo-Fe solid solutions, such as Co30Ni70, Co30Mo70, Ni30Mo70, Co 10Ni20Mo70, Fe10Co 25Ni65, Fe20Co20Ni60 and Fe30Co15Ni55 wt.% alloys, have been produced by mechanical alloying using commercial Ni, Co, Mo and Fe powders. The electrocatalytic properties of these nanocrystalline materials have been studied for hydrogen evolution reaction (HER) in 30 wt.% KOH aqueous solution at three different temperatures (308, 323 and 343 K) to determine the effect of Fe contamination. The methods employed were cyclic voltammetry, steady-state polarization (Tafel) techniques and ac impedance. For comparison, it was found that iron improved electrocatalytic activity for the hydrogen evolution reaction. Important changes in the activity were obtained when the temperature was increased. The electrocatalytic effect of Mo became important at high overvoltages and temperatures. The MA Fe30Co15Ni 55 and Co10Ni20Mo70 alloyed powders showed the best catalytic activities for HER.
AB - Ni-Co-Mo-Fe solid solutions, such as Co30Ni70, Co30Mo70, Ni30Mo70, Co 10Ni20Mo70, Fe10Co 25Ni65, Fe20Co20Ni60 and Fe30Co15Ni55 wt.% alloys, have been produced by mechanical alloying using commercial Ni, Co, Mo and Fe powders. The electrocatalytic properties of these nanocrystalline materials have been studied for hydrogen evolution reaction (HER) in 30 wt.% KOH aqueous solution at three different temperatures (308, 323 and 343 K) to determine the effect of Fe contamination. The methods employed were cyclic voltammetry, steady-state polarization (Tafel) techniques and ac impedance. For comparison, it was found that iron improved electrocatalytic activity for the hydrogen evolution reaction. Important changes in the activity were obtained when the temperature was increased. The electrocatalytic effect of Mo became important at high overvoltages and temperatures. The MA Fe30Co15Ni 55 and Co10Ni20Mo70 alloyed powders showed the best catalytic activities for HER.
KW - Ac impedance
KW - Electrocatalysts
KW - Fe contamination
KW - Hydrogen evolution reaction
KW - Mechanical alloying
UR - http://www.scopus.com/inward/record.url?scp=33244484105&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2005.10.003
DO - 10.1016/j.matchar.2005.10.003
M3 - Artículo
SN - 1044-5803
VL - 56
SP - 138
EP - 146
JO - Materials Characterization
JF - Materials Characterization
IS - 2
ER -