Carbon
Quantum Dot/NiFe Layered Double-Hydroxide Composite as a Highly Efficient
Electrocatalyst for Water Oxidation
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Abstract
The
design of highly efficient, durable, and earth-abundant catalysts
for the oxygen evolution reaction is crucial to a variety of important
energy conversion and storage processes. Here, we use carbon quantum
dots (CQDs, ∼5 nm) to form hybrids with the ultrathin nickel–iron
layered double-hydroxide (NiFe-LDH) nanoplates. The resulting CQD/NiFe-LDH
complex exhibits high electrocatalytic activity (with an overpotential
of ∼235 mV in 1 M KOH at a current density of 10 mA cm<sup>–2</sup>) and stability for oxygen evolution, which almost
exceed the values of all previously reported Ni-Fe compounds and were
comparable to those of the most active perovskite-based catalyst