Electrocatalytic
NO reduction to NH3 (NORR)
offers a
prospective approach to attain both harmful NO removal and efficient
NH3 electrosynthesis. Main-group p-block metals are promising
NORR candidates but still lack adequate exploration. Herein, p-block
Sb single atoms confined in amorphous MoO3 (Sb1/a-MoO3) are designed as an efficient NORR catalyst, exhibiting
the highest NH3 yield rate of 273.5 μmol h–1 cm–2 and a NO-to-NH3 Faradaic efficiency
of 91.7% at −0.6 V vs RHE. In situ spectroscopic characterizations
and theoretical computations reason that the outstanding NORR performance
of Sb1/a-MoO3 arises from the isolated Sb1 sites, which can optimize the adsorption of *NO/*NHO to lower
the reaction energy barriers and simultaneously exhibit a higher affinity
to NO than to H2O/H species. Moreover, our strategy can
be extended to prepare Bi1/a-MoO3, showing a
high NORR property, demonstrating the immense potential of p-block
metal single-atom catalysts toward the high-performing NORR electrocatalysis.
A new electrochemical model has been carefully established to explain the carbonation behavior of cement mortar, and the model has been validated by the experimental results. In fact, it is shown by this study that the electrochemical impedance behavior of mortars varies in the process of carbonation. With the cement/sand ratio reduced, the carbonation rate reveals more remarkable. The carbonation process can be quantitatively accessed by a parameter, which can be obtained by means of the electrochemical impedance spectroscopy (EIS)-based electrochemical model. It has been found that the parameter is a function of carbonation depth and of carbonation time. Thereby, prediction of carbonation depth can be achieved.
We demonstrate Pd metallene as an efficient catalyst for electrocatalytic NO reduction to NH3, showing the maximum NO-to-NH3 Faradaic efficiency of 89.6% with a corresponding NH3 yield rate of 112.5...
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