Synergistic Effect of N-Doped Carbon and Mn in NiFe LDH To Achieve 1 A cm–2 Current Density for the Oxygen Evolution Reaction DOI
Ayaz Muzammil, Rizwan Haider, Wenrui Wei

et al.

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

Published: April 5, 2025

The development of highly efficient oxygen evolution reaction (OER) electrocatalysts is pivotal to enhance the performance alkaline water electrolyzers. Herein, a facile two-step electrodeposition method developed for fabrication nitrogen-doped carbon (NC) and manganese-incorporated NiFe layered double hydroxides (LDHs) supported on Ni foam (NF). When evaluated in 1.0 M KOH solution, optimized material NC20-Mn-NiFe LDH showed excellent OER requiring low overpotentials 298 331 mV achieve high current densities 500 1000 mA cm-2, respectively, no loss density was observed at fixed potentials 1.53 1.57 V 125 h each case. This not only better than that state-of-the-art RuO2/NF but also most recently reported LDH-based catalysts. Such remarkable mainly attributed vertical growth sheets NF, facilitated electron transfer charge modulation active metal sites due electron-withdrawing electron-donating effects NC Mn, resulting shift rate-determining step from OOH* formation O2 desorption with decreased free energy. research work provides further insights into modulating structure materials delivering industrial-level overpotentials.

Language: Английский

Fabrication of TiO2/MOF Type II Heterojunction by Growth of TiO2 on Cr-Based MOF for Enhanced Photocatalytic Hydrogen Production DOI
Xiaoxiao Li,

Xinya Feng,

Delong Meng

et al.

Crystal Growth & Design, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 5, 2025

MOF-based heterojunctions can significantly enhance the efficiency of photocatalytic hydrogen production; however, construction efficient remains a formidable challenge. In this study, we successfully developed series Type II by growing TiO2 on Cr-based MOF, thereby regulating generation, separation, and transportation photogenerated charge carriers to improve evolution performance. Among these, 23%TiO2/MIL-101(Cr) photocatalyst exhibited highest production activity, achieving 884.01 μmol g–1 in just 5 h, which is 6.8 6.0 times that pure MIL-101(Cr) TiO2, respectively. Additionally, demonstrated excellent cyclic stability. Tiny particles were proven mainly deposited surface N2 sorption isotherm analyses, transmission electron microscopy (TEM), high-resolution TEM, high-angle annular dark field scanning microscopy, etc. Characterization techniques such as situ XPS confirmed formation TiO2/MIL-101(Cr) heterostructure. Band structure analysis indicates meets thermodynamic requirements for production. Furthermore, transient photocurrent measurements, electrochemical impedance analysis, photoluminescence reveal possesses superior capabilities carrier transport, resulting from kinetic perspective. This research offers valuable insights into preparation development photocatalysts

Language: Английский

Citations

2
Superhydrophilic Bimetallic Sulfide Nanosheets for Hydrogen Production Using Urea-Assisted Electrocatalytic Water Splitting DOI
Yuqian Bao, Ying Yang,

Jiayao Jiang

et al.

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

Published: March 26, 2025

Electrolysis of industrial and human urea-containing wastewater is beneficial to the environment, using urea oxidation reaction (UOR) instead oxygen evolution (OER) saves energy effectively improves performance electrocatalytic hydrolysis for hydrogen production. The Co9S8/Ni3S2 nanosheet structures on nickel foam (NF) are an active hydrophilic catalyst UOR (HER). This electrocatalyst needs a low overpotential 136 mV attain 10 mA·cm–2 HER, it can reach current density 100 at working potential 1.36 V vs RHE. introduction Co element regulates both morphology electronic structure. former results in Co9S8/Ni3S2/NF offering more sites with larger specific surface area morphology, while latter drives S move direction binding energy. examination cobalt sulfides as bifunctional energy-efficient electrolytic H2 production purification urea-rich harmless has significantly advanced due this work.

Language: Английский

Citations

0
Synergistic Cu2O@Ni(OH)2 Core–Shell Electrocatalyst for High-Efficiency Nitrate Reduction to Ammonia DOI

Zunjie Zhang,

Bingcheng Ge, Mengran Liu

et al.

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

Published: April 23, 2025

The electrocatalytic reduction reaction of nitrate (NO3RR) is anticipated to convert nitrogen-containing pollutants into valuable ammonia products. Copper-based catalysts have received great attention because their good performance in the NO3RR due strong binding energy with *NO3 intermediates. However, poor H2O dissociation ability Cu unable provide H• time for hydrogenation NOx, thus hindering electroreduction NO3-. Herein, we designed a shell-core nanocube electrocatalyst Cu2O@Ni(OH)2-x (x represents molar ratio Ni/Cu) using liquid phase combined etching and precipitation method NO3RR. Due synergistic effect between activation excellent Ni(OH)2, Cu2O@Ni(OH)2-3.3% shows an impressive yield rate (557.9 μmol h-1 cm-2) Faradaic efficiency (97.4%) at -0.35 V vs. RHE. Operando Raman Auger electron spectroscopy observe Cu2O during process. Density functional theory calculations paramagnetic resonance analysis reveals that Ni(OH)2 can lower barrier dissociation, thereby promoting generation accelerating *NO This research provides efficient Cu-based catalyst reducing NO3- may motivate development effective electrocatalysts further experimentation.

Language: Английский

Citations

0
Leafy ZIF‐Derived Bi‐Metallic Phosphate‐Mxene Nanocomposites for Overall Water Splitting DOI
Rupali S. Mane,

Dilkhush Zaroliwalla,

Ganga Periyasamy

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: April 28, 2025

Abstract Electrocatalytic water splitting is a significant method of hydrogen production to overcome energy scarcity and tackle the environmental pollution caused by extreme consumption fossil fuels. This work directs focus on development an efficient catalyst toward oxygen evolution reactions (HER OER). Herein, highly active robust bi‐metallic phosphate nanocomposite supported Mxene derived from in situ technique, using 2D (leafy) zeolitic imidazolate framework (ZIF 67) phosphorus‐doped nickel hydroxide [P‐Ni(OH) 2 ] as primary precursor for first time. The synergy between reaction mechanism leads formation porous, needle‐like morphology with layer boundary interface. A remarkable performance obtained significantly low overpotential excellent stability HER OER. In conjunction structural merits catalytic activity, attributed optimized porosity owing 2D/3D conducting interface channel. theoretical experimental insights study affirm conducive nature overall splitting. finding exposed new avenue chemistry MOF substrate develop electrocatalyst

Language: Английский

Citations

0
Ir NCs Embedded Co-MOF Nanosheets for Boosting Electrochemical Nitrate Reduction to Ammonia Performance DOI
Yunqing Zhu,

Gaigai Dong,

Fan Pan

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: 17(19), P. 28084 - 28093

Published: May 2, 2025

In this study, Ir nanoclusters adorned with abundant p-mercaptobenzoic acid (p-MBA) ligands were employed to fabricate an electrocatalytic material consisting of embedded within two-dimensional Co-MOF nanosheets (Ir NCs@Co-MOF) for the NO3- reduction reaction (NO3-RR). TEM analysis confirmed that are uniformly distributed in 2D nanosheets, average diameter about 1.8 nm. At a potential -0.8 V vs RHE, NCs@Co-MOF catalyst achieved nitrate conversion rate, ammonia selectivity, and yield 92.5, 81.4%, 230.1 μg·h-1·cm-2, respectively, over duration 120 min. The strong interaction between serves enhance activity accelerate rate reduction. Stability tests indicated after 20 cycles, both selectivity demonstrated relative stability, thereby indicating robust performance catalytic system. results EPR TBA quenching experiments indicate *H plays key role NO3-RR process. situ DEMS investigations revealed during process, pathway was as follows: *NO3 → *NO2 *NO *NOH *NH2OH *NH2 *NH3 NH3.

Language: Английский

Citations

0
Boosting Reaction Kinetics and Stability of Electrocatalytic Oxygen Evolution with Ir/CoV‐LDH/Graphene Heterogeneous Electrocatalyst DOI
Xianjun Zhu,

Le Fang,

Zichao Zhou

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: May 8, 2025

Abstract To address the challenge of low catalytic performance in electrocatalytic oxygen evolution reaction (OER) caused by slow kinetics, a novel approach is developed utilizing crystalline properties iridium (Ir) and hydrogen‐related layered double hydroxide (LDH) to enhance corrosion resistance. These materials are integrated into CoV‐LDH structure design an Ir/CoV‐LDH/G heterogeneous electrocatalyst. This innovative not only enhances kinetics but also optimizes electronic catalyst through interactions at interface, leading excellent OER performance. Notably, requires overpotentials merely 203 289 mV achieve current densities 10 100 mA cm −2 , respectively. Furthermore, when utilized Ir/CoV‐LDH/G||Pt/C electrolytic cell for overall water splitting, it delivers density mA·cm voltage 1.46 V, surpassing most commercial IrO₂||Pt/C previously reported Ir‐based LDH electrocatalysts. The exhibits remarkable stability, maintaining h without significant degradation.

Language: Английский

Citations

0
Bringing Porous Framework Materials toward Photocatalytic H2O2 Production DOI

Chenhao Bao,

Lan Li, Xiaofei Wang

et al.

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

Published: March 6, 2025

Photocatalytic H2O2 production driven by renewable solar energy is a promising and sustainable approach, with porous framework materials such as metal-organic frameworks (MOFs), covalent organic (COFs), hydrogen-bonded (HOFs) emerging highly efficient catalysts. This Review first presents the current research state of in photosynthesis, focusing on progress across different mechanism insights gained through advanced techniques. Furthermore, systematic categorization material modifications aimed at enhancing photocatalytic efficiency provided, linking structural to improved performance. Key factors charge carrier separation transfer, reaction pathways, stability are comprehensively analyzed. Finally, challenges related stability, scalability, cost-effectiveness, discussed alongside opportunities for future advancements. aims provide into understanding optimizing scalable photosynthesis.

Language: Английский

Citations

0
Synergistic Effect of N-Doped Carbon and Mn in NiFe LDH To Achieve 1 A cm–2 Current Density for the Oxygen Evolution Reaction DOI
Ayaz Muzammil, Rizwan Haider, Wenrui Wei

et al.

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

Published: April 5, 2025

The development of highly efficient oxygen evolution reaction (OER) electrocatalysts is pivotal to enhance the performance alkaline water electrolyzers. Herein, a facile two-step electrodeposition method developed for fabrication nitrogen-doped carbon (NC) and manganese-incorporated NiFe layered double hydroxides (LDHs) supported on Ni foam (NF). When evaluated in 1.0 M KOH solution, optimized material NC20-Mn-NiFe LDH showed excellent OER requiring low overpotentials 298 331 mV achieve high current densities 500 1000 mA cm-2, respectively, no loss density was observed at fixed potentials 1.53 1.57 V 125 h each case. This not only better than that state-of-the-art RuO2/NF but also most recently reported LDH-based catalysts. Such remarkable mainly attributed vertical growth sheets NF, facilitated electron transfer charge modulation active metal sites due electron-withdrawing electron-donating effects NC Mn, resulting shift rate-determining step from OOH* formation O2 desorption with decreased free energy. research work provides further insights into modulating structure materials delivering industrial-level overpotentials.

Language: Английский

Citations

0