Mediating Self‐Oxidation and Competitive Adsorption for Achieving High‐Selective Urea Oxidation Catalysis at Industrial‐Level Current Densities DOI Open Access
Pengfei Qiao, Guorui Li, Xiujuan Xu

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 23, 2024

Abstract Inhibiting the deactivation of nickel‐based catalysts caused by self‐oxidation and competitive adsorption behavior is still a major challenge for urea oxidation reaction (UOR), especially under industrial‐level current densities. In this study, crystalline NiSe 2 /amorphous NiFe‐LDH (NiSe /NiFe‐LDH) heterojunction catalyst rationally constructed selective electrocatalytic UOR. situ Raman spectra ex characterization results reveal that such structure can tailor impede accumulation NiOOH species during UOR process. Density function theory simulations disclose self‐driven charge transport from electron‐deficient region to electron‐rich would induce formation local electrophilic/nucleophilic adsorb electron‐donating ‐NH electron‐withdrawing C = O groups, respectively. This optimizes molecules hinders overaccumulation OH − ions on surface /NiFe‐LDH, which beneficial priority occurrence over oxygen evolution (OER) realization high selectivity. Benefiting tailored favorable adsorption, /NiFe‐LDH could act as high‐selective anode achieve ultrahigh 800 mAcm −2 only at 1.447 V. Besides, UV–vis spectrophotometry also unveiled has capability electrochemically degrade urea, offering great promise practical application potentials.

Language: Английский

Manipulating Trimetal Catalytic Activities for Efficient Urea Electrooxidation-Coupled Hydrogen Production at Ampere-Level Current Densities DOI

Huachuan Sun,

Zhiqiang Luo, Mingpeng Chen

et al.

ACS Nano, Journal Year: 2024, Volume and Issue: 18(52), P. 35654 - 35670

Published: Dec. 11, 2024

Replacing the oxygen evolution reaction (OER) with urea oxidation (UOR) in conjunction hydrogen (HER) offers a feasible and environmentally friendly approach for handling urea-rich wastewater generating energy-saving hydrogen. However, deactivation detachment of active sites powder electrocatalysts reported hitherto present significant challenges to achieving high efficiency sustainability production. Herein, self-supported bimetallic nickel manganese metal–organic framework (NiMn-MOF) nanosheet its derived heterostructure composed NiMn-MOF decorated ultrafine Pt nanocrystals (PtNC/NiMn-MOF) are rationally designed. By leveraging synergistic effect Mn Ni, along strong electronic interaction between PtNC at interface, optimized catalysts (NiMn-MOF PtNC/NiMn-MOF) exhibit substantially reduced potentials 1.459 −0.129 V reach 1000 mA cm–2 during UOR HER. Theoretical calculations confirm that Mn-doping heterointerface regulate d-band center catalyst, which turn enhances electron transfer facilitates charge redistribution. This manipulation optimizes adsorption/desorption energies reactants intermediates both HER UOR, thereby significantly reducing energy barrier rate-determining step (RDS) enhancing electrocatalytic performance. Furthermore, degradation rates PtNC/NiMn-MOF (96.1%) (90.3%) higher than those Ni-MOF most advanced catalysts. work provides valuable insights designing applicable treatment

Language: Английский

Citations

3
Organic fuels oxidation: A common misunderstanding related to non-noble fuel cell catalysts DOI
Galina A. Tsirlina

Current Opinion in Electrochemistry, Journal Year: 2024, Volume and Issue: 47, P. 101567 - 101567

Published: July 2, 2024

Language: Английский

Citations

2
Anion intercalation of NiMn-LDH accelerating urea electrooxidation on trivalent nickel DOI
Qian Zheng, Yuandong Yan,

Shaonan Zhang

et al.

Journal of Catalysis, Journal Year: 2024, Volume and Issue: unknown, P. 115814 - 115814

Published: Oct. 1, 2024

Language: Английский

Citations

1
Boosting electrocatalytic urea oxidation performance of NiSx-VS4-C mediated via glycerol coking DOI
Ming Yang, Zirui Liu, Fei Liu

et al.

Journal of Alloys and Compounds, Journal Year: 2024, Volume and Issue: 1008, P. 176743 - 176743

Published: Sept. 27, 2024

Language: Английский

Citations

0
Mediating Self‐Oxidation and Competitive Adsorption for Achieving High‐Selective Urea Oxidation Catalysis at Industrial‐Level Current Densities DOI Open Access
Pengfei Qiao, Guorui Li, Xiujuan Xu

et al.

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 23, 2024

Abstract Inhibiting the deactivation of nickel‐based catalysts caused by self‐oxidation and competitive adsorption behavior is still a major challenge for urea oxidation reaction (UOR), especially under industrial‐level current densities. In this study, crystalline NiSe 2 /amorphous NiFe‐LDH (NiSe /NiFe‐LDH) heterojunction catalyst rationally constructed selective electrocatalytic UOR. situ Raman spectra ex characterization results reveal that such structure can tailor impede accumulation NiOOH species during UOR process. Density function theory simulations disclose self‐driven charge transport from electron‐deficient region to electron‐rich would induce formation local electrophilic/nucleophilic adsorb electron‐donating ‐NH electron‐withdrawing C = O groups, respectively. This optimizes molecules hinders overaccumulation OH − ions on surface /NiFe‐LDH, which beneficial priority occurrence over oxygen evolution (OER) realization high selectivity. Benefiting tailored favorable adsorption, /NiFe‐LDH could act as high‐selective anode achieve ultrahigh 800 mAcm −2 only at 1.447 V. Besides, UV–vis spectrophotometry also unveiled has capability electrochemically degrade urea, offering great promise practical application potentials.

Language: Английский

Citations

0