CO₂-Assisted synthesis of a crystalline/amorphous NiFe-MOF heterostructure for high-efficiency electrocatalytic water oxidation

Abstract

Modulating the crystalline phase and structure of metal organic frameworks (MOFs) for superior electrocatalytic oxygen evolution reaction (OER) performance is a significant but challenging topic. Herein, a facile CO2-assisted strategy...

Improved Performance of g-C3N4 for Optoelectronic Detection of NO2 Gas by Coupling Metal–Organic Framework Nanosheets with Coordinatively Unsaturated Ni(II) Sites

“…One can see that the binding energy of N 1s in NiMOF/CN shifts slightly to a lower energy as compared to those of CN (Figure d). Remarkably, in the XPS Ni 2p spectrum of NiMOF, the characteristic peaks at 855.7 and 873.6 eV can be attributed to the Ni 2p 3/2 and Ni 2p 1/2 orbitals of Ni 2+ , respectively . For NiMOF/CN, the Ni 2p peaks demonstrate a slight offset to a higher energy, which further confirms the existing interactions between NiMOF and CN (Figure e).…”

“…Remarkably, in the XPS Ni 2p spectrum of NiMOF, the characteristic peaks at 855.7 and 873.6 eV can be attributed to the Ni 2p 3/2 and Ni 2p 1/2 orbitals of Ni 2+ , respectively. 36 For NiMOF/CN, the Ni 2p peaks demonstrate a slight offset to a higher energy, which further confirms the existing interactions between NiMOF and CN (Figure 1e). Also, the peak of the FT-IR spectrum of NiMOF (Figure S6) at 3603 cm −1 is red-shifted by 161 cm −1 after coupling CN, which is assigned to the formation of a hydrogen bond.…”

Amorphous/crystalline heterophase electrocatalysts: synthesis, applications and perspectives

“…In addition to the above synthetic strategies, other strategies, such as magnetic-field-assisted chemical deposition method, CO 2 -assisted synthesis and so on, have also been developed for the preparation of a/c heterophase nanomaterials. 60–62…”

“…In addition to the above synthetic strategies, other strategies, such as magnetic-field-assisted chemical deposition method, CO 2 -assisted synthesis and so on, have also been developed for the preparation of a/c heterophase nanomaterials. [60][61][62] For instance, Yang and co-workers designed a hierarchical nanoarray (Ni x Fe 1Àx -AHNAs) consisting of amorphous NiFe oxyhydroxide shell and crystalline NiFe alloy nanowire core by a facile magnetic-field-assisted chemical deposition strategy (Fig. 5(k)).…”

“…In addition, CO 2 -assisted synthesis was employed to fabricate an a/c heterostructure NiFe-based MOF (a/c-NiFe-MOF). 62 In detail, CO 2 was charged into the mixed solution up to the high pressure of 7.5 MPa at 35 1C for 3 h, and then a/c-NiFe-MOF was obtained. For comparison, a-NiFe-MOF was obtained by changing the reaction time to 1 h, and c-NiFe- MOF was obtained at higher reaction temperature and time without CO 2 charged.…”