Nitrogen dopants in nickel nanoparticles embedded carbon nanotubes promote overall urea oxidation

Zhang, Quan; Kazim, Farhad M. D.; Ma, Shuangxiu; Qu, Konggang; Li, Min; Wang, Yangang; Hu, Hao; Cai, Weiwei; Yang, Zehui

doi:10.1016/j.apcatb.2020.119436

Cited by 183 publications

(101 citation statements)

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“…Recently, Yang and co-workers prepared nickel nanoparticles embedded in nitrogen doped carbon nanotubes (Ni@NCNT) for the UOR. 147 The obtained Ni@NCNT catalyst showed much better UOR performance than Ni@CNT (Ni nanoparticles embedded in carbon nanotubes), and the optimal Ni@NCNT sample only required 1.5 V vs. RHE to afford 45.8 mA cm −2 in 1 M KOH with 0.5 M urea. DFT results revealed that the introduction of nitrogen dopants vastly weakened the binding strength between CO 2 and catalytically active sites, thus making the CO 2 desorption step more facile on Ni@NCNT, leading to enhanced UOR activities.…”

Section: Strategies For Designing Efficient Uor Electrocatalystsmentioning

confidence: 92%

Strategies for designing more efficient electrocatalysts towards the urea oxidation reaction

et al. 2022

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Section: Strategies For Designing Efficient Uor Electrocatalystsmentioning

confidence: 92%

Strategies for designing more efficient electrocatalysts towards the urea oxidation reaction

et al. 2022

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“…41 Yang's group proposed that Ni nanoparticles encapsulated in N-doped carbon nanotubes could facilitate the generation of the active Ni 3+ species, which led to a low UOR onset of 1.332 V vs. RHE and satisfactory operational stability. 81 The pioneering research from the Wu group further proved the critical role of elemental surface modification on regulating the UOR activity. 82 In their work, metallic S-modified b-Ni(OH) 2 nanosheets can be facilely obtained by simply treating the insulating b-Ni(OH) 2 in H 2 S, which exhibit outstanding electric conductivity benefiting from the sharply changed electronic structures brought by the S dopants (Fig.…”

Section: Elemental Incorporationmentioning

confidence: 99%

Recent advances in the pre-oxidation process in electrocatalytic urea oxidation reactions

Sun

Gao

et al. 2022

Chem. Commun.

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“…Urea, which always exists in sanitary sewage and waste water of industrial or agricultural production, does not only show low industrial value but could also be easily oxidized with only 0.37 V of thermodynamic oxidation potential, which is far lower than the theoretical potential of 1.23 V for OER. 15,16 That is, simultaneous hydrogen production and urea-rich waste water purification could be achieved by this urea electrolysis. In essence, owing to a sixelectron transfer process, UOR still faces a relatively slow reaction kinetics.…”

Section: Introductionmentioning

confidence: 99%

Heterostructured Ni₃S₂–Ni₃P/NF as a Bifunctional Catalyst for Overall Urea–Water Electrolysis for Hydrogen Generation

Liu

Wang

Liao

et al. 2021

ACS Appl. Mater. Interfaces

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Urea oxidation reaction (UOR) has been proposed to replace the formidable oxygen evolution reaction (OER) to reduce the energy consumption for producing hydrogen from electrolysis of water owing to its much lower thermodynamic oxidation potential compared to that of the OER. Therefore, exploring a highly efficient and stable hydrogen evolution and urea electrooxidation bifunctional catalyst is the key to achieve economical and efficient hydrogen production. In this paper, we report a heterostructured sulfide/phosphide catalyst (Ni 3 S 2 −Ni 3 P/ NF) synthesized via one-step thermal treatment of Ni(OH) 2 /NF, which allows the simultaneous occurrence of phosphorization and sulfuration. The obtained Ni 3 S 2 −Ni 3 P/NF catalyst shows a sheet structure with an average sheet thickness of ∼100 nm, and this sheet is composed of interconnected Ni 3 S 2 and Ni 3 P nanoparticles (∼20 nm), between which there are a large number of accessible interfaces of Ni 3 S 2 −Ni 3 P. Thus, the Ni 3 S 2 −Ni 3 P/NF exhibits superior performance for both UOR and hydrogen evolution reaction (HER). For the overall urea−water electrolysis, to achieve current densities of 10 and 100 mA cm −2 , cell voltage of only 1.43 and 1.65 V is required using this catalyst as both the anode and the cathode. Moreover, this catalyst also maintains fairly excellent stability after a long-term testing, indicating its potential for efficient and energy-saving hydrogen production. The theoretical calculation results show that the Ni atoms at the interface are the most efficient catalytically active site for the HER, and the free energy of hydrogen adsorption is closest to thermal neutrality, which is only 0.16 eV. A self-driven electron transfer at the interface, making the Ni 3 S 2 sides become electron donating while Ni 3 P sides become electron withdrawing, may be the reason for the enhancement of the UOR activity. Therefore, this work shows an easy treatment for enhancing the catalytic activity of Ni-based materials to achieve high-efficiency urea−water electrolysis.

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Nitrogen dopants in nickel nanoparticles embedded carbon nanotubes promote overall urea oxidation

Cited by 183 publications

References 50 publications

Strategies for designing more efficient electrocatalysts towards the urea oxidation reaction

Strategies for designing more efficient electrocatalysts towards the urea oxidation reaction

Recent advances in the pre-oxidation process in electrocatalytic urea oxidation reactions

Heterostructured Ni₃S₂–Ni₃P/NF as a Bifunctional Catalyst for Overall Urea–Water Electrolysis for Hydrogen Generation

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Nitrogen dopants in nickel nanoparticles embedded carbon nanotubes promote overall urea oxidation

Cited by 183 publications

References 50 publications

Strategies for designing more efficient electrocatalysts towards the urea oxidation reaction

Strategies for designing more efficient electrocatalysts towards the urea oxidation reaction

Recent advances in the pre-oxidation process in electrocatalytic urea oxidation reactions

Heterostructured Ni3S2–Ni3P/NF as a Bifunctional Catalyst for Overall Urea–Water Electrolysis for Hydrogen Generation

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Heterostructured Ni₃S₂–Ni₃P/NF as a Bifunctional Catalyst for Overall Urea–Water Electrolysis for Hydrogen Generation