A 2D NiFe Bimetallic Metal–Organic Frameworks for Efficient Oxygen Evolution Electrocatalysis

Abstract

Figure 4. Chronopotentiometry tests for Ni 0.75 Fe 0.25 BDC and RuO 2 (with a constant current density of 10 mA cm À2 ).

NiFeCo oxide as an efficient and sustainable catalyst for the oxygen evolution reaction

“…The overpotentials at various current densities are shown in Figure 5C for each catalyst. The lowest overpotential (248 mV at 1 mA cm −2 ) obtained from the ternary NiFeCo oxide electrode is comparable to the values reported for complex binary and ternary compound electrodes such as NiFe-LDH/rGO catalyst (296 mV), 38 NiFe (OH)x/FeS/IF (245 mV), 39 Fe 0.2 Ni 1.8 OOH/EGSI (237 mV), 40 Ni 2 Fe/ rGO is as low as 285 mV, 41 2D NiFe-based metal-organic framework (310 mV), 42 NiCoFe layered triple hydroxides (239 mV), 17 FeCoNi (288 mV), 14 and trimetallic NiFeMo (238 mV). 19 For fair comparison, we provided additional FeCo and NiCo metal oxide data as Supporting Information.…”

Single Step Grown NiFe Sponges as Efficient Water Splitting Electrocatalysts in Alkaline Medium

“…A detailed literature review shows that among the various transition TM‐based catalysts, Ni and Ni‐based compounds exhibit ‘good’ electrocatalytic activity for both the OER and HER processes . It has been reported that Ni together with Fe (NiFe) can have good OER properties compared to Ni alone in an alkaline medium .…”

Heterometallic Feed Ratio‐Dominated Oxygen Evolution Activity in Self‐Supported Metal‐Organic Framework Nanosheet Arrays Electrocatalyst

“…It was found that various factors including the feed ratio of the reactant components, preparation process, condition control, and characterization method have been found to be significantly regulated the morphologies and electronic structures of the resulting electrocatalysts. In particular, the cooperated effects from different components, such as mixed metallic species, structurally related organic ligand as well as the nanomaterials and the substrate, can greatly improve the electrocatalytic performances by modulating the morphological and electronic structures, which then further enhance the electrocatalytic activity and durability through the optimized absorption energy towards the active species . For example, a bimetallic MOF with mixed terephthalate and 2‐aminoterephthalate ligands directly immobilizated on the NF has exhibited enhanced OER performance than the single ligand‐derived counterpart resulting from the cooperated electronic interaction between the two organic linkers with different electron‐donating group .…”

“…All these observations clearly indicate the successful preparation of NF‐supported heterometallic MOF nanosheet arrays via solvothermal treatment. Previously reported nanomaterials with the same chemical compositions have owned various morphology including nanopolydra, nanoclusters, sheet‐like two‐dimensional structure nanosheet arrays by controlling the fabrication conditions,, , which are highly important for the electrocatalytic performances.…”

“…The latter two BEs should be assigned to the arylcarbon from the phenyl ring (C=C) and the carboxylate carbon of O–C=O . High‐resolution O 1s region contains three peaks at 531.5 eV, 532.7 eV and 534.0 eV (Figure S2), corresponding respectively to Fe–O and Ni–O, O–C=O bonds and absorbed water molecule , . As shown in Figure a, the high‐resolution Fe 2p region includes two main peaks at 713.4 eV and 726.7 eV for the Fe 2p 3/2 and Fe 2p 1/2 , showing the existence of Fe III species.…”