At present, a variety of catalysts
have been studied and used for
the electrocatalytic reduction of nitrate. However, it is still a
great challenge to improve the selectivity of the electrocatalytic
nitrate reduction reaction (NO3
–RR) catalyst
for ammonia and reduce the activity of the competitive reaction. Herein,
two-dimensional CuO
x
nanosheets with abundant
oxygen vacancy defects were in situ grown on Cu nanoparticles to construct
Cu/2D-CuO
x
composite nanomaterials as
nitrate reduction electrocatalysts. The two-dimensional (2D) nanosheet
morphology facilitated the exposure of active sites and promoted the
mass/charge transfer process during electrocatalysis. As a result,
the synergistic effect of abundant oxygen vacancy defects and the
2D nanosheet-like structure on the surface of the catalyst endows
the Cu/2D-CuO
x
with superior performance
for the nitrate reduction reaction, achieving high ammonia selectivity
(97.56%) and NH4
+ yield (1476 μg h–1 mg–1).