Boosting oxygen evolution reaction by FeNi hydroxide-organic
Bao, F. et al. Host, suppressor, and promoter-the roles of Ni and Fe on oxygen evolution reaction activity and stability of NiFe alloy thin films in alkaline media.
Bao, F. et al. Host, suppressor, and promoter-the roles of Ni and Fe on oxygen evolution reaction activity and stability of NiFe alloy thin films in alkaline media.
For oxygen reduction reaction (ORR), Ni-Fe SA/N-C shows excellent activity, and the initial potential and half-wave potential are 0.96 and 0.90 V, respectively, which are higher than those of commercial Pt/C; for oxygen evolution reaction (OER), a low overpotential of 330 mV at 10 mA·cm−2 is obtained for Ni-Fe NP/N-C, prominently better …
Meanwhile, the newly formed Ni-O-Fe bonds create spin channels for electron transfer, resulting in a significant improvement of the oxygen evolution reaction …
OverviewElectrochemistryUsesDurabilityHistoryPlate design of the original Edison batteryChargeDischarge
The half-cell reaction at the positive plate from black nickel(III) oxide-hydroxide NiO(OH) to green nickel(II) hydroxide Ni(OH)2 : and at the negative plate: (Discharging is read left to right, charging is from right to left.) The open-circuit voltage is 1.4 volts, dropping to 1.2 volts during discharge. The electrolyte mixtu…
Pan et al. provide a theory-guided design and fabrication strategy of atomic Fe–Ni dual sites in N,P-co-doped C as catalysts for the oxygen evolution reaction (OER). The enhanced OER activity originates from the geometric and electron matching between Fe–Ni dual sites with P doping and OOH∗ intermediates. This strategy, considering configuration …
The Ni/Fe battery presents also some drawbacks such as the use of relatively expensive Ni(OH) 2 used for the positive electrode but more importantly, the relatively low full cell energy efficiency (65–70%). This last point explains the low interest received by the Ni/Fe technology recently. ... inducing a competitive water splitting reaction ...
The bifunctional atomic Fe–Ni dual-metal pairs are formed in hollow Fe–NiNC catalysts. Fe and Ni atoms in dual-metal pairs undergo charge redistribution …
Whatever the initial Fe/Ni ratio of the Fe–Ni alloy (varying between 0.004 and 7.4), the best oxygen evolution reaction performance (beyond that of commercial IrO2) and durability was obtained ...
Aqueous Zinc-ion batteries are one of the most attractive battery systems due to the zinc metal anode exhibits a low redox potential (−0.76 V vs. SHE in an acidic solution and −1.25 V vs. SHE in an alkaline solution), high theoretical specific capacity (gravimetric capacity of 820 mAh g −1 and volumetric capacity of 5851 mAh cm −3), and …
The Fe–NiNC catalysts were synthesized by the dual-solvent ion deposition method as illustrated in Fig. 1 a. Briefly, the as-synthesized Ni-doped polydopamine (Ni-PDA) (see Materials and methods for detailed preparation) was used as the host and dispersed in n-hexane under sonication bsequently, a certain amount of aqueous …
The development of inexpensive and high-performance bifunctional electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of crucial significance for rechargeable metal-air batteries, but remains challenging. Herein, we report an ingenious bifunctional oxygen electrocatalyst integrating ZIF-derived …
The charge–discharge reactions of the battery are (5) 2 NiOOH + Fe +2 H 2 O ⇄ charge discharge 2 Ni (OH) 2 + Fe (OH) 2 (E cell =1.37 V) Under deep-discharge, a Ni–Fe cell with a negative-limited configuration will undergo a further discharge reaction at a potential that is lower than the first step represented by reaction (5), i.e. (6 ...
Pan et al. provide a theory-guided design and fabrication strategy of atomic Fe–Ni dual sites in N,P-co-doped C as catalysts for the oxygen evolution reaction (OER). The enhanced OER activity originates from the …
| (A) The OER polarization curves of Ni, Fe-O-G SACs with different Ni, Fe ratio (Ni, Ni 6 Fe 1, Ni 4 Fe 1, Ni 1 Fe 1, Fe) obtained at scan rate of 2 mV s −1 and 80% iR correction.
The following cell reactions are: ... As a result, the flexible Ni/Fe fiber battery with gel electrolyte exhibits good battery capacity, performance, and durability, with a volumetric energy density of 61.0 mW h/cm 3 and a power density of 48.4 W/cm 3, maintaining 91.2 % performance after 30,000 repeated cycles. In order to fabricate high ...
Once optimized the pyrolysis conditions and the Fe:Ni ratio, the Fe/Ni@N–C catalyst showed high bifunctional OER/ORR activity in a three-electrode cell in an alkaline environment (KOH 1 M), with an overall ΔE for the ORR-OER reaction of 0.75 V. Fe/Ni@N–C was assembled in a rechargeable zinc-air battery, resulting in an excellent ...
The preparation of platinum-free electrocatalysts with ideal oxygen reduction reaction (ORR) activity is of great significance for cost-effective fuel cells. Herein, we synthesize a series of Pd-based (PdFe, PdCo, PdNi, and Pd) nanowires (PdM NWs). Their diameters are about 10 nm. And the lengths are up to even micrometers. The mass …
Synthesis of Co/Ni/Fe doped dicyandiamide-formaldehyde resin (CoFeNi-DCFR) To synthesize CoFeNi-DCFR, 5 g of DCDA, 1.455 g of Co(NO 3) 2 ·6H 2 O, 0.808 g of Fe(NO 3) 2 ·9H 2 O, 0.873 g of Ni(NO 3) 2 ·6H 2 O, and 10 mL of deionized water were mixed in a flask (Co:Ni:Fe = 50:30:20). Subsequently, 4.5 mL of formaldehyde solution …
These values are higher than for lead/acid and Ni-Fe battery systems, but lower than for Ni-MH batteries. ... the cell reaction in the Ni-MH battery involves the generation and consumption of water upon charge and discharge. This prevents the cell from drying, and hence results in good gas recombination, good high-and low …
The assembled battery performance based on the Fe-Ni-N-P-C cathode was superior to that of not only commercial Pt/C + RuO 2 but also many other reported …
For instance, at relatively high operating temperatures (about 40°C), the battery lifecycle and lifetime of Ni-Fe cells are only 1500 cycles and 8 years, respectively. Several corrosion reactions may occur in Ni-Fe cells. These reactions can lead to self-discharge of about 1%–2% of the cell''s nominal capacity at room temperature.
In this paper, we report on the preparation and catalysis of a bifunctional molecular catalyst (Fe[Pc(I) 4]+Ni[Pc(I) 4]@NC PDI) for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in rechargeable Zn-air batteries.This catalyst is prepared by self-assembling tetraiodo metal phthalocyanines (Fe[Pc(I) 4] and Ni[Pc(I) 4]) …
Instead, energy is consumed in hydrogen production and a much smaller amount is dissipated through side reactions of the cell, Eq. 8: ... The electrical performance of a Ni-Fe battolyser is therefore almost as good as a Ni-Fe battery. Elevated temperature reduces the measured cell capacity by a modest amount, but also reduces the voltage at ...
With the reactions involved, a Ni-Fe battery can provide an open circuit voltage of ~1.4 V and a nominal voltage of 1.2 V, which is lower compared to lead–acid …
The nickel-iron (Ni-Fe) battery is a century-old technology that fell out of favor compared to modern batteries such as lead–acid and lithium-ion batteries.
There are some shreds of evidence that the first iron-based battery was developed by artisans of Baghdad, way back in 200 BC. 51 Historically, iron-based batteries came into the picture with the invention of nickel–iron (Ni–Fe) alkaline batteries in 1901 by Edison and Junger. Around 1910 or so, Ni–Fe batteries containing iron-based anodes and nickel …
The synthetic process of Fe, Ni-SAs/DNSC for the dual single atomic Fe and Ni sites co-anchored on defect-rich porous nitrogen and sulfur carbon frameworks is schematically illustrated in Fig. 1 a rst, the ZIF-8 was prepared by the assembly of Zn 2+ and 2-methylimidazole (MeIM). Then, S-ZIF-8@SiO 2 was synthesized via the …
The chemical valence states and compositions of Fe-NiTe 2 /Ni 2 P were further studied by X-ray photoelectron spectroscopy (XPS). Fig. 3 and S5 show XPS spectra of Fe-NiTe 2 /Ni 2 P before and after stability, indicating that the catalyst is composed of Ni, Fe, Te and P. In Fig. 3 a, it can be clearly seen that there are 6 fitting peaks belonging to …
Recently, significant progress has been achieved in the development of Fe-based anodes for Ni-Fe batteries via nanostructural design, componential regulation, interface engineering, and elemental …
In order to reveal the relationship between the structure and the electrochemical oxygen reduction reaction (ORR) activity of different double transition metal decorated catalysts, three different double transition metal and N co-doped carbon material cathode catalyst materials (FeCo–NC, FeNi–NC and CoNi–NC) were prepared in this …
The introduction of these compounds in the cathode can inhibit the shuttling of polysulfide and accelerate the overall redox reaction. In the following sections, the working mechanism of the Fe-, Co-, and Ni-based compounds on the Li-S battery systems are discussed. 3.1. Confining the sulfur to the cathodic side
(D) The TOF value at 300 mV overpotential of Ni, Fe-O-G SACs with different Ni, Fe ratio (Ni, Ni 6 Fe 1, Ni 4 Fe 1, Ni 1 Fe 1, Fe), obtained at scan rate of 2 mV s −1 and 80% iR correction.
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