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

Engineering of novel vanadium-doped [email protected] heterostructure for enhancing urea oxidation reaction at high current density DOI
Guangfu Qian, Haotian Xu, Liancen Li

et al.

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 679, P. 1320 - 1329

Published: Sept. 30, 2024

Language: Английский

Citations

4
Sub-3 nm Pt3Ni nanoparticles for urea-assisted water splitting DOI Creative Commons
Shun Lu, Xingqun Zheng,

Kaixin Jiang

et al.

Advanced Composites and Hybrid Materials, Journal Year: 2025, Volume and Issue: 8(2)

Published: Feb. 24, 2025

Language: Английский

Citations

0
Electron Shuttling of Iron‐Oxygen‐Cobalt Bridging in Cobalt Assembled Iron Oxyhydroxide Catalyst Boosts the Urea Oxidation Stability and Activity DOI Open Access

Guizeng Liang,

Rongrong Zhang, C. S. Ji

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 21, 2025

Abstract Iron (Fe)‐based materials hold great potential as urea oxidation reaction (UOR) catalysts, however, the deactivation of active Fe‐oxyhydroxide (FeOOH) species induced by its dissolution during catalytic process under high current densities is still significant challenge. Herein, cobalt (Co) assembled FeOOH constructed, and formation Iron‐Oxygen‐Cobalt (Fe‐O‐Co) bridging triggers electron transfer from Co to Fe sites. This shuttling induces low valence state sites in FeOOH. Co‐FeOOH catalyst achieves a density 1000 mA cm −2 at voltage merely 1.59 V, showing substantial improvement compared pure (1.97 V). Meanwhile, urea‐assisted anion exchange membrane electrolyzer, after 24 h continuous operation , fluctuation 12.4%, significantly lower than that (49.9%). The situ experiments theoretical calculations demonstrate Fe‐O‐Co endows suppressive Fe‐segregation, fast charge Fe(Co)OOH phase negative‐shifted d‐band center metal sites, boosting UOR stability activity.

Language: Английский

Citations

0
Constructing efficient-active-centers selenide heterointerface for enhanced urea oxidation-driven hydrogen evolution DOI
Jichao Shi, Tong Wei, Xiaoqing Yan

et al.

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 127, P. 576 - 585

Published: April 15, 2025

Language: Английский

Citations

0
Local Charge Density Regulation of NiP2 Nanosheets via Ru Doping for Electrocatalytic Urea Oxidation DOI

J.K. Jian,

Yi Qiao, Fengyi Chen

et al.

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125390 - 125390

Published: April 1, 2025

Language: Английский

Citations

0
Metal-Doped CoS Nanosheets: Breaking Scaling Limitations for Enhanced Urea Electrooxidation and Hydrogen Evolution DOI
Xue‐Feng Cheng, Lihua Jiang, Xiaopeng Zhao

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 23, 2025

The electrocatalytic urea oxidation reaction (UOR) is a promising approach to lowering the energy barrier of anode half-reaction in water splitting for energy-efficient hydrogen production and remove excess from blood or dialysis fluid. However, sluggish kinetics large overpotential caused by scaling relationships significantly limit development UOR technology. Herein, bifunctional amorphous M-CoS (M = Zr, Cu, Mn, Fe) nanosheets were synthesized via one-step electrodeposition process. Among them, Zr-CoS exhibited exceptional performance, achieving 10 mA cm-2 at an 1.26 V, outperforming recently reported catalysts, while CoS demonstrated evolution impressively low -175 mV. Density functional theory calculations revealed that doped Cu Zr ions migrated adsorption sites N atoms before after C-N cleavage, breaking limitation relationships. Meanwhile, cleavage step showed good linear relationship with variation integrated crystal orbital Hamilton population (ΔICOHP), indicating ΔICOHP was descriptor evaluate performances. This work not only emphasized outstanding performances but also offered innovative insights into role metal sulfides UOR.

Language: Английский

Citations

0
Heterogeneous Engineering of Ni–Co–S Nanosheets for Efficient Urea Electrolysis DOI
Bing Wang,

Hejing Wang,

Wenya Li

et al.

The Journal of Physical Chemistry C, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

Language: Английский

Citations

0
Salt-assisted synthesis of transition metal-based catalysts: Basic principles, recent progress in the synthetic strategy and multifunctional applications DOI

Chengxu Jin,

Dongxu Wang, Aiping Wu

et al.

Coordination Chemistry Reviews, Journal Year: 2025, Volume and Issue: 538, P. 216725 - 216725

Published: April 21, 2025

Language: Английский

Citations

0
Multi-Functional Amorphous Nickel Phosphide Electrocatalytic Reduction of Nitrate for Ammonia Production: Unraveling the Anode-Driven Enhancement Mechanism DOI Open Access

Qiwen Yao,

Yanping Xiao,

Haoqing Wang

et al.

Sustainability, Journal Year: 2025, Volume and Issue: 17(9), P. 3835 - 3835

Published: April 24, 2025

The electrocatalytic reduction of nitrate (ERN) to ammonia offers a promising route address energy shortages and environmental pollution, but its practical application is hindered by low selectivity due complex eight-electron transfer pathways high consumption (EC) from the kinetically sluggish oxygen evolution reaction (OER). This study proposes dual strategy: (1) designing multi-functional self-supported ANP electrode via vapor deposition enhance ERN activity (2) replacing OER with thermodynamically favorable anodic reactions (urea oxidation (UOR), sodium metabisulfite (S(IV)OR), sulfite urea (S(IV)/UOR)) reduce EC. cathode achieved removal rate (R%) 97.7%, (SE%) 91.8%, Faradaic efficiency (FE) 97.3% at −1.2 V, an yield 0.0616 mmol h−1 mg−1 EC 8.239 kWh/kg, while in situ-generated atomic hydrogen (*H) was identified as key improving selectivity. Replacing alternative significantly improved system efficiency: UOR reduced 17.5%, S(IV)OR saved 27.6% 7.1% higher yield, hybrid S(IV)/UOR 32.1% lower 12.6% greater than OER. These differences stemmed variations cell voltage production rates. work provides viable approach for selective nitrate-to-ammonia conversion guides design energy-efficient systems sustainable nitrogen recovery.

Language: Английский

Citations

0
Electrochemical Exfoliation of the Two-Dimensional Conjugated Metal–Organic Framework for High-Performance Urea Electrooxidation DOI
Yong Li, Yu Xiang, Yu Fan

et al.

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: May 11, 2025

Two-dimensional (2D) conjugated metal-organic frameworks (c-MOFs) have attracted extensive interest in electrochemical fields due to their inherent electrical conductivity. However, the severe interlayer stacking still poses barriers toward potential applications. The reliable synthesis of ultrathin c-MOF nanosheets is crucial yet remains challenging. Herein, we demonstrate an exfoliation approach obtain from layer-stacked crystals. Our results reveal electric field-induced ion intercalation mechanism and provide a viable method for M-HHTP (M = Ni, Cu, Co; HHTP 2,3,6,7,10,11-hexahydroxytriphenylene) nanosheets. To prove utility, obtained Ni-HHTP as urea oxidation reaction (UOR) catalysts achieve ultrahigh current density 165.7 mA cm-2 at 1.35 V versus reversible hydrogen electrode nearly 100% selectivity N-products. Experimental characterization theoretical calculations that fully exposed square planar NiO4 active centers effectively reduce energy barrier C-N bond cleavage UOR suppress parasitic oxygen evolution reaction.

Language: Английский

Citations

0