期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 2, 页码 2023-2036出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b03444
关键词
Methanol fuel cell; Spinel; Mesoporous zeolite; Noble metal free electrocatalyst; Multifunctional catalyst
资金
- Nano Mission, DST, New Delhi [SR/NM-NS-1054/2015]
- MHRD, New Delhi
- DST-FIST
A unique strategy to obtain highly efficient electrocatalysts based on the spinel Ni0.5Cu0.5Co2O4 and mesoporous ZSM-5 (Zeolite Socony Mobil-5) is reported here for methanol oxidation in an alkaline medium. To develop an efficient catalyst, Ni2+-Cu2+ ion-exchanged mesoporous ZSM-5 and Ni0.5Cu0.5Co2O4 are prepared. 30 wt % of Ni0.5Cu0.5Co2O4 decorated Ni2+-Cu2+ ion-exchanged mesoporous ZSM-5 exhibits exceptionally higher catalytic activity with reasonably low onset potential than that of Ni0.5Cu0.5Co2O4, NiCo2O4, CuCo2O4, and Ni2+-Cu2+ ion-exchanged mesoporous ZSM-5. Electrochemical oxidation of HCHO and HCOOH also takes place over this catalyst at the same condition. The material exhibits high current density (21.4 mA/cm(2)) and stable electrocatalytic activity (with 99% retention) even after 1000 potential cycles. However, the benchmark catalyst Pt(20%)/C exhibits low activity (1.6 mA/cm(2)) and significant deactivation phenomenon (with 25% activity retention) at the identical condition. The cooperative contributions provided by Ni0.5Cu0.5Co2O4 and Ni2+-Cu2+ ion-exchanged mesoporous ZSM-5 support having Bronsted acidity, large external surface area, and intercrystalline mesoporosity deliver excellent electrocatalytic activity. The ease of synthesis, scale-up, stable and exceptional electrocatalytic activity paves the path toward the development of highly efficient alkaline direct methanol fuel cells.
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