Hierarchical Ni3N/Ni0.2Mo0.8N heterostructure nanorods arrays as efficient electrocatalysts for overall water and urea electrolysis

Li, Ruiqing; Wan, Xiaoyu; Chen, Baoli; Cao, Ruyuan; Ji, Qinghong; Deng, Jie; Qu, Konggang; Wang, Xuebing; Zhu, Yachao

doi:10.1016/j.cej.2020.128240

Cited by 109 publications

(46 citation statements)

References 42 publications

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“…Using the UOR to replace the OER for hydrogen generation has appealed much attention Figure a presents two polarization curves for the OER and UOR using V-FeNi 3 N/Ni 3 N as anodes in 1.0 M KOH solution with the absence and presence of 0.33 M urea.…”

Section: Resultsmentioning

confidence: 99%

“…Using the UOR to replace the OER for hydrogen generation has appealed much attention. 80 Figure 6a presents two polarization curves for the OER and UOR using V-FeNi 3 N/ Ni 3 N as anodes in 1.0 M KOH solution with the absence and presence of 0.33 M urea. To achieve current densities of 10 and 100 mA cm −2 , 1.382 and 1.42 V (vs RHE) potentials are required for the UOR, respectively.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Vanadium-Doping and Interface Engineering for Synergistically Enhanced Electrochemical Overall Water Splitting and Urea Electrolysis

Wang

Sun

et al. 2021

ACS Appl. Mater. Interfaces

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Fabricating effective non-precious metal-based catalysts for hydrogen production via electrochemical water splitting is of considerable importance but remains challenging. Transition metal nitrides possessing metallic character and corrosion resistance have been considered as potential replacements for precious metals. However, their activities for water electrolysis are impeded by the strong hydrogen adsorption and low water adsorption energies. Herein, V-doped bimetallic nitrides, V-FeNi3N/Ni3N heterostructure, are synthesized via a hydrothermal–nitridation protocol and used as electrocatalysts for water splitting and urea electrolysis. The V-FeNi3N/Ni3N electrode exhibits superior HER and OER activities, and the overpotentials are 62 and 230 mV to acquire a current density of 10 mA cm–2, respectively. Moreover, as a bifunctional electrocatalyst for overall water splitting, a two-electrode device needs a voltage of 1.54 V to reach a current density of 10 mA cm–2. The continuous electrolysis can be run for more than 120 h, surpassing most previously reported electrocatalysts. The excellent performance for water electrolysis is dominantly due to V-doping and interface engineering, which could enhance water adsorption and regulate the adsorption/desorption of intermediates species, thereby accelerating HER and OER kinetic processes. Besides, a urea-assisted two-electrode electrolyzer for electrolytic hydrogen production requires a cell voltage of 1.46 V at 10 mA cm–2, which is 80 mV lower than that of traditional water electrolysis.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Vanadium-Doping and Interface Engineering for Synergistically Enhanced Electrochemical Overall Water Splitting and Urea Electrolysis

Wang

Sun

et al. 2021

ACS Appl. Mater. Interfaces

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“…Among these transition metal compounds, NiMoO 4 on Ni foam has been researched as a promising electrocatalyst for its facile synthesis in large quantities. However, its intrinsic activity still remains defective, especially for its deficient active site (only Ni site) [ 29 , 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Oxygen-Plasma-Induced Hetero-Interface NiFe2O4/NiMoO4 Catalyst for Enhanced Electrochemical Oxygen Evolution

Wei

et al. 2022

Materials

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The electrolysis of water to produce hydrogen is an effective method for solving the rapid consumption of fossil fuel resources and the problem of global warming. The key to its success is to design an oxygen evolution reaction (OER) electrocatalyst with efficient conversion and reliable stability. Interface engineering is one of the most effective approaches for adjusting local electronic configurations. Adding other metal elements is also an effective way to enrich active sites and improve catalytic activity. Herein, high-valence iron in a heterogeneous interface of NiFe2O4/NiMoO4 composite was obtained through oxygen plasma to achieve excellent electrocatalytic activity and stability. In particular, 270 mV of overpotential is required to reach a current density of 50 mA cm−2, and the overpotential required to reach 500 mA cm−2 is only 309 mV. The electron transfer effect for high-valence iron was determined by X-ray photoelectron spectroscopy (XPS). The fast and irreversible reconstruction and the true active species in the catalytic process were identified by in situ Raman, ex situ XPS, and ex situ transmission electron microscopy (TEM) measurements. This work provides a feasible design guideline to modify electronic structures, promote a metal to an active oxidation state, and thus develop an electrocatalyst with enhanced OER performance.

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“…A typical work reported by Wang's group proposed that NOR is a two-step, oneelectron reaction including an electrogenerated catalyst dehydrogenation reaction from lattice hydroxyl to electron-deficient lattice oxygen and a spontaneous nucleophile dehydrogenation reaction on model Ni(OH) 2 catalysts 20 . Compared to Ni(OH) 2 , some recent studies have shown that nickel non-hydroxides exhibit better performance [23][24][25] . Nevertheless, the surface species transformation of metallic catalysts often occurs during electrooxidation, leading to much controversy regarding the activity origin 20 .…”

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confidence: 99%

Insights into the activity of nickel boride/nickel heterostructures for efficient methanol electrooxidation

et al. 2022

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Designing efficient catalysts and understanding the underlying mechanisms for anodic nucleophile electrooxidation are central to the advancement of electrochemically-driven technologies. Here, a heterostructure of nickel boride/nickel catalyst is developed to enable methanol electrooxidation into formate with a Faradaic efficiency of nearly 100%. Operando electrochemical impedance spectroscopy and in situ Raman spectroscopy are applied to understand the influence of methanol concentration in the methanol oxidation reaction. High concentrations of methanol inhibit the phase transition of the electrocatalyst to high-valent electro-oxidation products, and electrophilic oxygen species (O* or OH*) formed on the electrocatalyst are considered to be the catalytically active species. Additional mechanistic investigation with density functional theory calculations reveals that the potential-determining step, the formation of *CH2O, occurs most favorably on the nickel boride/nickel heterostructure rather than on nickel boride and nickel. These results are highly instructive for the study of other nucleophile-based approaches to electrooxidation reactions and organic electrosynthesis.

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Hierarchical Ni3N/Ni0.2Mo0.8N heterostructure nanorods arrays as efficient electrocatalysts for overall water and urea electrolysis

Cited by 109 publications

References 42 publications

Vanadium-Doping and Interface Engineering for Synergistically Enhanced Electrochemical Overall Water Splitting and Urea Electrolysis

Vanadium-Doping and Interface Engineering for Synergistically Enhanced Electrochemical Overall Water Splitting and Urea Electrolysis

Oxygen-Plasma-Induced Hetero-Interface NiFe2O4/NiMoO4 Catalyst for Enhanced Electrochemical Oxygen Evolution

Insights into the activity of nickel boride/nickel heterostructures for efficient methanol electrooxidation

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