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Filanovsky B.,Tel Aviv University | Granot E.,Tel Aviv University | Dirawi R.,Tel Aviv University | Presman I.,Nanergy Ltd. | And 2 more authors.
Nano Letters | Year: 2011

Fuel cells (FCs) are promising electrochemical devices that convert chemical energy of fuels directly into electrical energy. We present a new anode material based on nanotextured metal copper for fuel cell applications. We have demonstrated that low-cost copper catalyst anodes act as highly efficient and ultra-long-lasting materials for the direct electro-oxidation of ammonia-borane and additional amine derivatives. High power densities of ca. 1W· cm -2 (ca. -1 V vs Ag/AgCl at 1 A) are readily achieved at room temperature. We fabricate fuel cell devices based on our nanotextured Cu anodes in combination with commercial air cathodes. © 2011 American Chemical Society. Source


Granot E.,Tel Aviv University | Filanovsky B.,Tel Aviv University | Presman I.,Nanergy Ltd. | Kuras I.,Nanergy Ltd. | Patolsky F.,Tel Aviv University
Journal of Power Sources | Year: 2012

Fuel cells (FCs) are promising electrochemical devices that convert the chemical energy of fuels directly into electrical energy, as long as the fuel is supplied. This paper describes a room-temperature hydrazine/air direct-liquid fuel cell (DLFC) based on the use of nanostructured copper electrodes. We show that nanostructured copper electrodes function as highly efficient and ultra-long-lasting catalyst for the electro-oxidation of hydrazine. Our Cu/hydrazine anodes show high electrical efficiency for long periods of continuous operation (more than 500 h). A hydrazine/air fuel cell prototype was built with a nanostructured Cu/hydrazine anode, combined with a commercial air cathode. The output of this cell is about 0.45 W at 1 A (0.1 A cm -2 corresponds to the anode area), and supplies about 2.3 Wh and 1300 Wh kg -1 hydrazine. The hydrazine discharge efficiency is higher than 85%. © 2011 Elsevier B.V. All rights reserved. Source


Filanovsky B.,Tel Aviv University | Granot E.,Tel Aviv University | Presman I.,Nanergy Ltd. | Kuras I.,Nanergy Ltd. | Patolsky F.,Tel Aviv University
Journal of Power Sources | Year: 2014

We present here a long-term room-temperature (RT) direct-liquid hydrazine/air fuel cell device. This hydrazine/air fuel cell is based on low-cost easily-prepared nanotextured Cu-Ni anodes as the hydrazine (Hz) catalyst, combined with a commercial anion-exchange membrane film and a commercial air cathode. In addition, our hydrazine/air fuel cell consists on an improved novel design that results in remarkably high mechanical and chemical stabilities for long periods of operation. This hydrazine/air fuel cell can operates continuously for about ∼2000 h (limited mainly by cathode and membrane deterioration) with continuous fuel supply, and supplies about 0.58 V at 1 A (14.3 mA cm-2, with a discharge efficiency of about 70% (drift is less than 0.01% h-1), and appears to be suitable for mass production. The use of optimally-combined multi-metal electrodes suggests the possibility to create novel catalysts of improved electrochemical efficiency and stability. Our fuel cell devices can find broad applications in different civilian and military field mobile and stationary uses, for instance, in future fuel-cell operated vehicles and stationary back-up power electrical stations. © 2013 Elsevier B.V. All rights reserved. Source

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