Recent advances in highly active nanostructured NiFe LDH catalyst for electrochemical water splitting

Bodhankar, Pradnya M.; Sarawade, Pradip B.; Singh, Gurwinder; Vinu, Ajayan; Dhawale, Dattatray S.

doi:10.1039/d0ta10712c

Cited by 300 publications

(170 citation statements)

References 232 publications

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“…EIS was carried out from 100 kHz to 0.1 Hz at an overpotential of 300 mV. [ 6 ] TOF was calculated through the following equation: [ 43,57,58 ] TOF = jS /4 Fn , where j is current density (A cm −2 ) at η = 190 mV, S is geometric area of working electrode (cm 2 ), F is Faraday constant with a value of 96 485 C mol −1 , and n is the number of moles of active materials (mol). The FE was calculated based on the equation:

FE = \frac{V_{\exp .}}{V_{the normal.}} = \frac{V_{\exp .}}{\frac{V_{m} Q}{n F}}

, where V exp is the measured volume of generated O 2 (mL), V the is the theoretical volume of O 2 (mL), V m is the molar volume of gas (24.5 L mol −1 ), Q is the quantity of electric charge (C), n is the number of electrons transferred for the generation of a O 2 molecule, F is the Faraday constant with a value of 96 485 C mol −1 .…”

Section: Methodsmentioning

confidence: 99%

Ultrafast Room‐Temperature Synthesis of Self‐Supported NiFe‐Layered Double Hydroxide as Large‐Current–Density Oxygen Evolution Electrocatalyst

Liu

Fang

et al. 2021

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Water splitting is a promising sustainable technology to produce high purity hydrogen, but its commercial application remains a giant challenge due to the kinetically sluggish oxygen evolution reaction (OER). In this work, a time‐ and energy‐saving approach to directly grow NiFe‐layered double hydroxide (NiFe‐LDH) nanosheets on nickel foam under ambient temperature and pressure is reported. These NiFe‐LDH nanosheets are vertically rooted in nickel foam and interdigitated together to form a highly porous array, leading to numerous exposed active sites, reduced resistance of charge/mass transportation and enhanced mechanical stability. As self‐supported electrocatalyst, the representative sample (NF@NiFe‐LDH‐1.5‐4) shows an excellent large‐current–density catalytic activity for OER in alkaline electrolyte, requiring low overpotentials of 190 and 220 mV to reach the current densities of 100 and 657 mA cm−2 with a Tafel slope of 38.1 mV dec−1. In addition, NF@NiFe‐LDH‐1.5‐4 as an overall water splitting electrocatalyst can stably achieve a large current density of 200 mA cm−2 over 300 h at a low cell voltage of 1.83 V, meeting the requirement of industrial hydrogen production. This exceedingly simple and ultrafast synthesis of low‐cost and highly active large‐current–density OER electrocatalysts can propel the commercialization of hydrogen producing technology via water splitting.

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FE = \frac{V_{\exp .}}{V_{the normal.}} = \frac{V_{\exp .}}{\frac{V_{m} Q}{n F}}

Section: Methodsmentioning

confidence: 99%

Ultrafast Room‐Temperature Synthesis of Self‐Supported NiFe‐Layered Double Hydroxide as Large‐Current–Density Oxygen Evolution Electrocatalyst

Liu

Fang

et al. 2021

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“…During HER and OER mechanistic steps, the presence of metal phosphides showed enhanced charge transfer with high electrical conductivity of phosphides compared to their own oxide counterparts [16,55–61] . Hence, it is highly desired to visualize the importance of Ni and Co based phosphides towards electrocatalytic water splitting with such high improvements towards AWS [1,62–65] . Figure 2 shows the schematic representation of metal phosphides that can be used as both anode and cathode (bi‐functional catalyst) towards water splitting.…”

Section: Introductionmentioning

confidence: 99%

Recent Progresses in Engineering of Ni and Co based Phosphides for Effective Electrocatalytic Water Splitting

et al. 2021

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Producing pure hydrogen (H2) is presumably an alternative way for replacing the fossil fuels. Since the last few decades finding alternatives for state‐of‐the‐art catalysts such as IrO2 and RuO2 for oxygen evolution reaction (OER) and platinum for hydrogen evolution reaction (HER) has been a major challenge in the field of water electrolysis. To replace such precious metals, many efforts have been made to develop transition metal based bifunctional catalyst for alkaline water electrolysis. Among them, transition metal phosphides (TMPs) show superior activity in both OER and HER with varying pH conditions. Moreover, the different phases of phosphides, P‐rich or P deficient metal composites (Ni/Co−P) offer a great opportunity in total water splitting (TWS) applications. There is no detailed review in the literature outlining the possible combinations, synthesis methods and morphologies of Ni and Co based phosphides. Based on the above shortage about TMPs as a bi‐functional catalyst for water electrolysis, this review summarizes the activity and stability Ni and Co phosphides. Furthermore, the review highlights monometallic phosphides such as NiP and CoP, bi‐metallic phosphides such as NiCoP, and the synergistic effect of doping Fe into NiP/CoP or Fe ‐NiCoP systems while detailing their preparation methods. Overall, this review extends the role of designing Ni and Co phosphides for efficient large scale electrocatalysis of hydrogen production.

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“…Among various reported non‐noble metal‐based OER catalysts, nickel‐iron (NiFe) oxides/hydroxides with the attractive electrocatalytic activity and fast OER conversion capability have been a class of competitive catalyst candidates in alkaline electrolytes [17–19] . To date, although the exact OER active sites remain controversial, great efforts have been made to advance the OER activity of NiFe oxides/hydroxides by modulating the morphology, changing the Ni/Fe ratio, doping heteroatoms, creating defects, and so on [20–23] .…”

Section: Introductionmentioning

confidence: 99%

“…The different Ni/Fe ratios in NiFe oxides/hydroxides lead to different chemical composition, crystal structure, and even charge density, [3,25] which, to some extent, is also answerable to the catalytic capacity of NiFe oxides/hydroxides towards OER [26] . Heteroatom doping and defect engineering can cause lattice distortion and alter the electronic structure, thus creating more highly active catalytic sites and optimizing the adsorption of the intermediates [17,27–30] . Moreover, the structure also affects the charge transfer ability of NiFe oxides/hydroxides [31] .…”

Section: Introductionmentioning

confidence: 99%

Promoting Electrocatalytic Oxygen Evolution of Ultrasmall NiFe (Hydr)oxide Nanoparticles by Graphene‐Support Effects

et al. 2021

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Although the activity of electrocatalysts towards oxygen evolution reaction (OER) has achieved considerable improvement by modulating the intrinsic electron structure, the role of supports to OER performance, often being reduced to enhancing the conductivity, is not fully explored. In this paper, a proof‐of‐concept study based on a series of hybrids of nickel iron (hydr)oxide nanoparticles (NiFeO NPs) and carbon supports with different oxidation level compared the motivation of supports for OER activity. The key to implementation lay in anchoring and growing of NiFeO NPs on the various carbon supports by electrostatic assembly and subsequent in‐situ reduction. A series of experiments indicated that the strong coupling of metal ions and graphene oxide (GO) contributed to the formation of ultrasmall NiFeO NPs (≈2 nm) and the firm interaction between NiFeO NPs and GO, which in turn resulted in exposing more metal atoms, modulating local electron structure of active sites, and accelerating the charge‐transfer ability. The OER activity of optimal NiFeO NPs anchored on rGO (NiFeO NPs/rGO) was significantly elevated, achieving an overpotential as small as 201 mV at 10 mA cm−2 and a low Tafel slope of 68 mV dec−1, as well as remarkable stability. Such exciting capacity for catalyzing OER prevailed over the vast majority of previously reported transition‐metal electrocatalysts, even superior to numerous noble metal‐containing catalysts. The electrolyzer employing NiFeO NPs/rGO and commercial Pt/C for anode and cathode could be powered by a solar cell for efficient alkaline seawater splitting. This work opens up a universal and scalable way for further advancing the intrinsic activity of energy‐related materials.

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Recent advances in highly active nanostructured NiFe LDH catalyst for electrochemical water splitting

Abstract: The progress in the design strategies and synthetic mechanisms for each class of NiFe LDH electrocatalysts as well as the key trends in structural characterizations in catalyzing the water splitting process are discussed.

Cited by 300 publications

References 232 publications

Ultrafast Room‐Temperature Synthesis of Self‐Supported NiFe‐Layered Double Hydroxide as Large‐Current–Density Oxygen Evolution Electrocatalyst

Ultrafast Room‐Temperature Synthesis of Self‐Supported NiFe‐Layered Double Hydroxide as Large‐Current–Density Oxygen Evolution Electrocatalyst

Recent Progresses in Engineering of Ni and Co based Phosphides for Effective Electrocatalytic Water Splitting

Promoting Electrocatalytic Oxygen Evolution of Ultrasmall NiFe (Hydr)oxide Nanoparticles by Graphene‐Support Effects

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