Fe₁N₄–O₁ site with axial Fe–O coordination for highly selective CO₂ reduction over a wide potential range

Abstract

The proposed working mechanism of the electrochemical CO2 reduction reaction on Fe1N4, Fe1N4–N1, and Fe1N4–O1 active sites.

Boosting CO2Electroreduction over a Cadmium Single‐Atom Catalyst by Tuning of the Axial Coordination Structure

“…In addition, this phenomenon has also been observed on FeN 4 -O 1 and CoN 5 SACs. [43,53] Moreover,t he difference between thermodynamic limiting potentials for CO 2 RR and HER (U L (CO 2 )-U L (H 2 )) has been calculated to understand the selectivity of the models. [54] As shown in Figure 1D,the U L (CO 2 )-U L (H 2 )values of FeN 4 , CoN 4 ,NiN 4 ,and CdN 4 are negative,indicating that the HER occurred preferentially,a nd the *H may suppress the adsorption of *COOH and *CO,l eading to the poor selectivity for CO 2 RR.…”

Atomically-dispersed NiN4–Cl active sites with axial Ni–Cl coordination for accelerating electrocatalytic hydrogen evolution

“…Meanwhile, the same conclusion can be drawn from the rst derivative curve (Fig. 2b), 33,42 24,25 The wavelet transforms (WT) was resorted to demonstrate the existence of single-atom dispersed Ni species in the samples. 42,43 As shown in Fig.…”

“…2e and S12 †) to optimize the active site structure. 22,24 Under the alkaline condition, we examined the Volmer-Heyrovsky mechanism (Fig. 4a), which involves three steps: (i) the water molecule is physically adsorbed at rst on the Ni metal center and is then dissociated into H* adatom and OH À ; (ii) another H 2 O molecule is adsorbed on the H-Ni bond and it directly reacts with the H* adatom that forms H 2 *, accompanied by the OH À desorption.…”

“…[19][20][21] However, most of the reported regulation of SACs is mainly carried out in the plane and the study of axial coordination is rarely proposed. 22,23 Chen et al 24 achieved coordination at the Fe site by chelating the Fe precursor with an O-doped carbonaceous carrier, preparing atom-dispersed FeN 4 -O active sites with axial Fe-O coordination. Wang et al 25 reported a novel CO 2 reduction reaction catalyst consisting of coordination of the dispersed Ni-N 4 site with the axial traction O atom (Ni-N 4 -O).…”

Boosting CO2Electroreduction over a Cadmium Single‐Atom Catalyst by Tuning of the Axial Coordination Structure

“…It can be seen SACs. [43,53] Moreover,t he difference between thermodynamic limiting potentials for CO 2 RR and HER (U L (CO 2 )-U L (H 2 )) has been calculated to understand the selectivity of the models. [54] As shown in Figure 1D,the U L (CO 2 )-U L (H 2 )values of FeN 4 , CoN 4 ,NiN 4 ,and CdN 4 are negative,indicating that the HER occurred preferentially,a nd the *H may suppress the adsorption of *COOH and *CO,l eading to the poor selectivity for CO 2 RR.…”