Abstract
Eu 2O 3 as a cathodic electrocatalyst was for the first time investigated and found to exhibit not only a high electrocatalytic activity for oxygen reduction, but also a strong tolerance to the attack of BH 4 −. Based on these experimental findings, a simple membraneless direct borohydride fuel cell (DBFC) is assembled and exhibits a peak power density of 66.4 mW cm − 2 at 0.495 V under ambient condition by using the Eu 2O 3-catalyzed cathode and hydrogen storage alloy anode. Since this new configuration of DBFCs can operate very well without the help of expensive cation-exchange membranes, it may provide a simple way to construct cost-effective and high efficient DBFCs for a number of portable applications.
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