A NiCo-MOF nanosheet array based electrocatalyst for the oxygen evolution reaction

Abstract

Metal organic frameworks (MOFs) are excellent materials for energy storage and conversion.

The Passive Effect of MXene on Electrocatalysis: A Case of Ti3C2Tx/CoNi−MOF nanosheets for Oxygen Evolution Reaction

“…The corresponding high‐resolution XPS spectra of Co 2p and Ni 2p were compared in Figure 4. As observed in the pristine CoNi 20 −MOFNs, the Co 2p spectrum can be deconvoluted into five peaks centered at 775.1, 780.9, 797.1, 784.6, and 802.7 eV, which can be ascribed to the Co LMM Auger peak, Co 2p 3/2 , Co 2p 1/2 , and the Co 2+ satellite features, respectively (Figure 4a) [33,39–41] . The Co 2p spectrum of CoNi 20 −MOFNs@MX shows five deconvoluted peaks located at 775.5, 780.9, 796.9, 784.7, and 802.7 eV (Figure 4b), showing a similar binding feature as that of the CoNi 20 −MOFNs compound.…”

“…As shown in Figure 3a, Co−MOFNs reveals a small oxidation peak at 1.28 V vs RHE referring to the Co 2+ /Co 3+ redox couple [29–31] . While Ni−MOFNs reveals a broad oxidation peak at the potential window of 1.35∼1.50 V vs RHE referring to the Ni 2+ /Ni 3+ redox couple before the onset of OER, indicating a redox reaction mediated OER process [32–33] . With the incorporation of Ni in the Co−MOFNs, a new precatalytic oxidation peak emerges at the potential window of 1.15∼1.30 V vs. RHE, which featured with Co 2+ /Co 3+ and Ni 2+ /Ni 3+ conversion, and can be ascribed to the strong electronic coupling between Co and Ni [29] .…”

Adsorption of Co(II) from aqueous solution using municipal sludge biochar modified by HNO3

“…30, 286.40, 285.60, 285.10 and 284.70 eV corresponding to -COOH, C ¼ O, C À OH, C-H and C À C bonds respectively (Kuang et al 2015). Figure 4(c (Thangasamy et al 2020). It also demonstrates that Co(II) is successfully adsorbed on the surface of CSB and cobalt was adsorbed in Co(II) form.…”

Preparation of a Bimetallic NiFe‐MOF on Nickel Foam as a Highly Efficient Electrocatalyst for Oxygen Evolution Reaction

“…[37] The peaks of the O 1s spectra (Figure 3e) are 532.6 eV, 531.4 eV and 530.7 eV, corresponding to the absorption water, carboxyl group (OÀ C=O) and M (Ni or Fe)À O, respectively. [38] For the N 1s spectra (Figure 3f), the peak of 399.5 eV corresponds to pyrrolic-N or MÀ N. The spectra of C 1s, O 1s and N 1s have the same peak position in these samples, which indicates that they have the same chemical state. These results correspond to the FT-IR results.…”