Atomically Dispersed W₁–O₃ Bonded on Pd Metallene for Cascade NO Electroreduction to NH₃

Abstract

Electrocatalytic NO reduction to NH 3 (NORR) offers a prospective method for removing hazardous NO and producing valuable NH 3 simultaneously. Herein, we demonstrate that atomically dispersed W on Pd metallene (W 1 Pd) can be an efficient and robust NORR catalyst. Atomic coordination characterizations unravel that W single atoms exist as W 1 −O 3 moieties bonded on Pd metallene. In situ spectroscopic measurements and theoretical calculations reveal the synergistic cascade effect of W 1 − O 3 and Pd metallene to promote the NORR energetics of W 1 Pd, in which the activation and hydrogenation of NO occur on W 1 −O 3 , while Pd metallene dissociates H 2 O and donates protons required for hydrogenation of NO to NH 3 . Consequently, W 1 Pd exhibits an NH 3 yield rate of 758.5 μmol h −1 cm −2 with an NH 3 -Faradaic efficiency of 91.3% in a flow cell (272.1 μmol h −1 cm −2 and 93.7% in H-type cells), ranking almost the highest performance among all reported NORR catalysts.

Atomically Dispersed Sn Confined in FeS2 for Nitrate‐to‐Ammonia Electroreduction

“…The absence of Sn-Sn bond proves that the introduced Sn exists in an atomically dispersed state. [51][52][53][54][55][56] This finding can be further verified by the wavelet transform (WT, Figure 2c) contour plots, showing no Sn-Sn intensity maximum. Quantitative EXAFS fitting reveals that single-atomic Sn bonds with the neighboring Fe atoms to construct the unique p-d hybridized Sn-Fe pair sites in the form of Fe 2 -Sn-S configuration (Figure S4, Table S1, Supporting Information).…”

Low-coordination single Ni atoms on graphitic C3N4 for nitrite electroreduction to ammonia

“…Notably, no Ni–Ni (Ni foil) or Ni–O (NiO) bonds are detected, confirming that the metallic/oxidized Ni species are absent and Ni in Ni 1 /C 3 N 4 exists in atomic dispersion state. 37–40 The atomic-level dispersion of Ni on C 3 N 4 can also be proved by wavelet transform (WT) analysis (Fig. 2d–f), signifying that Ni 1 /C 3 N 4 exhibits an intense WT signal of Ni–N bond, which distinguishes remarkably from the WT signals of other references.…”

Defective boron nitride nanosheets: an efficient non-metal catalyst for electrochemical reduction of NO to NH3

“…As a start, we estimate the NO adsorption behavior on D-BN, since NO adsorption is the initial pivotal step in activating the NORR. 45 As presented in Fig. 4a, the NO molecule is barely absorbed on pristine BN, where NO bond extension is negligible and electron transfer from BN to NO is close to zero.…”