TY - JOUR
T1 - Platinum group metal-free NiMo hydrogen oxidation catalysts
T2 - High performance and durability in alkaline exchange membrane fuel cells
AU - Kabir, Sadia
AU - Lemire, Kenneth
AU - Artyushkova, Kateryna
AU - Roy, Aaron
AU - Odgaard, Madeleine
AU - Schlueter, Debbie
AU - Oshchepkov, Alexandr
AU - Bonnefont, Antoine
AU - Savinova, Elena
AU - Sabarirajan, Dinesh C.
AU - Mandal, Pratiti
AU - Crumlin, Ethan J.
AU - Zenyuk, Iryna V.
AU - Atanassov, Plamen
AU - Serov, Alexey
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2017.
PY - 2017
Y1 - 2017
N2 - We introduce a new platinum group metal-free (PGM-free) hydrogen oxidation electrocatalyst with superior performance in anodes of alkaline exchange membrane fuel cells (AEMFCs). A carbon-supported bimetallic nickel-molybdenum catalyst was synthesized by thermal reduction of transition metal precursors on the surface of a carbon support (KetjenBlack 600J). The mass-weighted activity of 4.5 A gMe-1 determined in a liquid electrolyte 0.1 M NaOH using a rotating disk electrode (RDE) technique is comparable to the value reported for Pd/C with a comparable particle size under similar conditions. This NiMo/KB catalyst was integrated in a membrane electrode assembly (MEA) using an alkaline exchange membrane and ionomer. Single AEMFC tests performed in a H2/O2 configuration resulted in a record power density output of 120 mW cm-2 at 0.5 V, the MEA was found to be durable under the conditions of potential hold of 0.7 V for 115 h. For the first time, operando X-ray computed tomography (CT) experiments were performed demonstrating liquid water formation at the PGM-free anode during cell operation, and in situ ambient pressure X-ray photoelectron spectroscopy (APXPS) and X-ray absorption spectroscopy (APXAS) were used to study the role of molybdenum in hydrogen adsorption.
AB - We introduce a new platinum group metal-free (PGM-free) hydrogen oxidation electrocatalyst with superior performance in anodes of alkaline exchange membrane fuel cells (AEMFCs). A carbon-supported bimetallic nickel-molybdenum catalyst was synthesized by thermal reduction of transition metal precursors on the surface of a carbon support (KetjenBlack 600J). The mass-weighted activity of 4.5 A gMe-1 determined in a liquid electrolyte 0.1 M NaOH using a rotating disk electrode (RDE) technique is comparable to the value reported for Pd/C with a comparable particle size under similar conditions. This NiMo/KB catalyst was integrated in a membrane electrode assembly (MEA) using an alkaline exchange membrane and ionomer. Single AEMFC tests performed in a H2/O2 configuration resulted in a record power density output of 120 mW cm-2 at 0.5 V, the MEA was found to be durable under the conditions of potential hold of 0.7 V for 115 h. For the first time, operando X-ray computed tomography (CT) experiments were performed demonstrating liquid water formation at the PGM-free anode during cell operation, and in situ ambient pressure X-ray photoelectron spectroscopy (APXPS) and X-ray absorption spectroscopy (APXAS) were used to study the role of molybdenum in hydrogen adsorption.
UR - https://www.scopus.com/pages/publications/85036478940
U2 - 10.1039/c7ta08718g
DO - 10.1039/c7ta08718g
M3 - Article
AN - SCOPUS:85036478940
SN - 2050-7488
VL - 5
SP - 24433
EP - 24443
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 46
ER -