Fast and facile synthesis of carbonate-modified NiFe layered double hydroxide nanosheets by dielectric barrier discharge microplasma: mechanism and application in enhanced water oxidation

Abstract

A fast and facile approach was designed to fabricate carbonate (Ci)-modified NiFe layered double hydroxide (LDH) nanosheets array on carbon cloth (CC) by dielectric barrier discharge (DBD) microplasma. The whole synthetic process can be completed within 1 h at ambient temperature and pressure. The prepared NiFe LDH-Ci/CC emerges a superior catalytic activity for oxygen evolving reaction in alkaline media, which only demands an overpotential of 240 mV at 20 mA cm -2 with a high stability for at least 90 h, and shows an excellent turnover frequency value of 0.323 mol O 2 s -1 at 350 mV. Time-resolved measurements of direct emission spectra for nitrogen second positive system N 2 (C-B) were measured in the DBD microplasma discharge. And a high vibrational temperature (T vib , 3100 K) and rotational temperature (T rot , 340 K) were obtained, indicating a great chemical reactivity. In addition, the intermediate products of hydroxyl radicals ( Á OH) were identified and the possible synthesis mechanism was tentatively proposed.

Three-Dimensional Coral-Like NiFe-Layered Double Hydroxides on Biomass-Derived Nitrogen-Doped Carbonized Wood as a Sensitive Probe for Nonenzymatic Urea Determination

“…Furthermore, the concrete docking of redox active flaky corals over the NCW without any binders promises the high interfacial electron transfer behavior and robustness under harsh electrochemical cycling. Although numerous research efforts focused on growing NF-LDHs on different substrates, 3D coral-like microstructures have not been reported yet, indicating the impact of the NCW substrate on the development of distinct structural features. − Figures S2 and S3 represent the elemental mapping and the EDAX analysis performed for the NF-75 electrode. The presence of C, N, O, Ni, and Fe was confirmed from the EDAX analysis.…”

CuO Nanosheets Prepared by Dielectric Barrier Discharge Microplasma as Catalysts for the Oxygen Evolution Reaction

“…In addition, compared with Cu-based catalysts prepared by traditional hydrothermal and redox methods, DBD synthesis has the advantages of being fast and green and possessing many active sites. Based on this preparation strategy, catalysts, such as CoO@NiFe LDH/NF, NiFe LDH-Ci/CC, etc., are prepared and applied.…”