Dual Doping Induced Interfacial Engineering of Fe<sub>2</sub>N/Fe<sub>3</sub>N Hybrids with Favorable d‐Band towards Efficient Overall Water Splitting

Hu, Yuwen; Huang, Dongwei; Zhang, Jingnan; Huang, Yongchao; Balogun, Muhammad‐Sadeeq; Tong, Yexiang

doi:10.1002/cctc.201901224

Cited by 97 publications

(57 citation statements)

References 88 publications

(38 reference statements)

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“…Hence, it is an urgent desire for researchers to develop many different kinds of bifunctional electrocatalysts with different performance to promote the development of H 2 fuels [30]. Transition metal oxide [31,32], transition metal sulfides [33][34][35][36][37][38][39] and selenides [40][41][42][43], transition metal phosphides [44][45][46][47][48][49], transition metal nitrides [50][51][52] become potential candidates as non-noble metal electrocatalysts for electrolysis of water. The Ni 3 S 2 /MnS-O nanosheets on Ni foam (NF/T(Ni 3 S 2 /MnS-O)) were employed as anode and cathode for overall water splitting ( Fig.…”

Section: Electrocatalysts For Overall Water Splittingmentioning

confidence: 99%

Water Splitting: From Electrode to Green Energy System

et al. 2020

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HIGHLIGHTS • Bifunctional electrode and electrolytic cell configuration for electrochemical water splitting are reviewed. • The different green energy systems powered water splitting are summarized and discussed. • An outlook of future research prospects for the development of green energy system powered water splitting in practical application process is proposed. ABSTRACT Hydrogen (H 2) production is a latent feasibility of renewable clean energy. The industrial H 2 production is obtained from reforming of natural gas, which consumes a large amount of nonrenewable energy and simultaneously produces greenhouse gas carbon dioxide. Electrochemical water splitting is a promising approach for the H 2 production, which is sustainable and pollution-free. Therefore, developing efficient and economic technologies for electrochemical water splitting has been an important goal for researchers around the world. The utilization of green energy systems to reduce overall energy consumption is more important for H 2 production. Harvesting and converting energy from the environment by different green energy systems for water splitting can efficiently decrease the external power consumption. A variety of green energy systems for efficient producing H 2 , such as two-electrode electrolysis of water, water splitting driven by photoelectrode devices, solar cells, thermoelectric devices, triboelectric nanogenerator, pyroelectric device or electrochemical water-gas shift device, have been developed recently. In this review, some notable progress made in the different green energy cells for water splitting is discussed in detail. We hoped this review can guide people to pay more attention to the development of green energy system to generate pollution-free H 2 energy, which will realize the whole process of H 2 production with low cost, pollution-free and energy sustainability conversion.

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Section: Electrocatalysts For Overall Water Splittingmentioning

confidence: 99%

Water Splitting: From Electrode to Green Energy System

et al. 2020

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“…Impressively, after incorporating Fe species into CoP@Ru, CoFeP@Ru exhibits excellent durability with negligible degradation after 18000 s at 10 mA cm −2 (Figure d). As reported, the resulting high valence Co and Fe act as the active sites, facilitating the formation of peroxide intermediates during OER (Table S2) …”

Section: Resultsmentioning

confidence: 57%

“…As reported, the resulting high valence Co and Fe act as the active sites, facilitating the formation of peroxide intermediates during OER (Table S2). [20,31,32] Inspired by the remarkable HER and OER catalytic performances by choosing CoFeP@Ru, we further assembled an electrolyzer in two-electrode system with CoFeP@Ru in both the cathode and anode to test the overall water splitting. [32] As show in Figure 4e, among CoP, CoP@Ru, CoFeP@Ru electrodes, the electrolyzer with CoFeP@Ru electrodes affords the highest activity with the need for a cell voltage of � 1.76 V to drive the current density of 10 mA cm À 2 .…”

Section: Resultsmentioning

confidence: 99%

“…Hitherto, transition metal phosphides (TMPs), such as Fe-, [5,6] Co-, [3,7,8] and Ni-based phosphides, [9,10] are potentially promising catalysts in electrocatalysis owing to the abundant and dispersive active centers, rich chemical states, and suitable delectron configuration. Recently, construction of metal-transition metal phosphides (M/TMPs) interface materials has become significant and attractive.…”

Section: Introductionmentioning

confidence: 99%

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Constructing a Rod‐like CoFeP@Ru Heterostructure with Additive Active Sites for Water Splitting

Liu

et al. 2020

ChemCatChem

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Interfacial engineering and defect modulation can provide abundant active sites for catalysts to further boost the catalysis process. In this work, we develop a strategy to grow multiheterogeneous cobalt phosphide (CoP) nanorods with rich interfaces and defects along the one-dimensional (1D) nanostructure by dual incorporation of Fe and Ru (CoFeP@Ru). Such a catalyst exhibits high activity and stability towards the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), with overpotentials of only 38 mV in 0.5 M H 2 SO 4 and 48 mV in 1.0 M KOH for HER, and an overpotential of 340 mV in 0.1 M KOH for OER at 10 mA cm À 2. Finally, as the bifunctional catalyst, an alkali electrolyzer is assembled and delivers at a low cell voltage, with almost 100 % Faradaic efficiency. Our experimental results demonstrate that Fe incorporation can disturb or even break the periodic structure of cobalt phosphides, causing a redistribution of the electronic structure and electron density of activity sites, while Ru can significantly enhance the catalytic kinetics, as well as electrochemical and mechanical stability.

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“…Interstitial iron nitride (ε-Fe 3 N), possesses metallic characteristics with continuous Fe 6 octahedral structure, has been showing great potential in OER catalysis. [14][15][16] Intriguingly, all Fe atoms in Fe 3 N are nominally in monovalent state (Fe(I)) and coordinated with two neighboring N atoms; this uniform coordination environment makes Fe 3 N an ideal model to identify the active state. [17] However, the catalytic activity of pristine Fe 3 N is low largely due to the stable octahedral feature of Fe 3 N and therefore induces the difficulty of the structure reconstruction.…”

mentioning

confidence: 99%

Genuine Active Species Generated from Fe₃N Nanotube by Synergistic CoNi Doping for Boosted Oxygen Evolution Catalysis

Dong

Tian

et al. 2020

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The surface reconstruction of oxygen evolution reaction (OER) catalysts has been proven favorable for enhancing its catalytic activity. However, what is the active site and how to promote the active species generation remain unclear and are still under debate. Here, the in situ synthesis of CoNi incorporated Fe3N nanotubes (CoNi–Fe3N) on the iron foil through the anodization/electrodeposition/nitridation process for use of boosted OER catalysis is reported. The synergistic CoNi doping induces the lattice expansion and up shifts the d‐band center of Fe3N, which enhances the adsorption of hydroxyl groups from electrolyte during the OER catalysis, facilitating the generation of active CoNi–FeOOH on the Fe3N nanotube surface. As a result of this OER‐conditioned surface reconstruction, the optimized catalyst requires an overpotential of only 285 mV at a current density of 10 mA cm−2 with a Tafel slope of 34 mV dec−1, outperforming commercial RuO2 catalysts. Density functional theory (DFT) calculations further reveal that the Ni site in CoNi–FeOOH modulates the adsorption of OER intermediates and delivers a lower overpotential than those from Fe and Co sites, serving as the optimal active site for excellent OER performance.

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Dual Doping Induced Interfacial Engineering of Fe₂N/Fe₃N Hybrids with Favorable d‐Band towards Efficient Overall Water Splitting

Cited by 97 publications

References 88 publications

Water Splitting: From Electrode to Green Energy System

Water Splitting: From Electrode to Green Energy System

Constructing a Rod‐like CoFeP@Ru Heterostructure with Additive Active Sites for Water Splitting

Genuine Active Species Generated from Fe₃N Nanotube by Synergistic CoNi Doping for Boosted Oxygen Evolution Catalysis

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Dual Doping Induced Interfacial Engineering of Fe2N/Fe3N Hybrids with Favorable d‐Band towards Efficient Overall Water Splitting

Cited by 97 publications

References 88 publications

Water Splitting: From Electrode to Green Energy System

Water Splitting: From Electrode to Green Energy System

Constructing a Rod‐like CoFeP@Ru Heterostructure with Additive Active Sites for Water Splitting

Genuine Active Species Generated from Fe3N Nanotube by Synergistic CoNi Doping for Boosted Oxygen Evolution Catalysis

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Dual Doping Induced Interfacial Engineering of Fe₂N/Fe₃N Hybrids with Favorable d‐Band towards Efficient Overall Water Splitting

Genuine Active Species Generated from Fe₃N Nanotube by Synergistic CoNi Doping for Boosted Oxygen Evolution Catalysis