For
many types of fuel cells (FCs), the electrochemical oxygen
reduction reaction (ORR) is the bottleneck reaction. At present, a
major challenge to the industrialization of these devices is attributed
to the high price and inferior stability of the common platinum group
metal (PGM) catalysts. To address this issue, a zeolitic imidazolate
framework (ZIF-8) derived tungsten (W) single-atom electrocatalyst
has been synthesized and evaluated for the ORR. It was found that
the prepared catalyst (W–N–C) possesses a W single-atom
catalysis center coordinated in a nitrogen-rich carbon matrix with
a half-wave potential (E
1/2) of 0.86 V
and a negligible current decay over a long-term durability test, which
surpass those of many reported nonprecious metals and even commercial
Pt/C catalysts.
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