Lattice Oxygen Redox Mechanisms in the Alkaline Oxygen Evolution Reaction

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(32)

Published: March 25, 2024

Abstract Understanding of fundamental mechanism and kinetics the oxygen evolution reaction (OER) is pivotal for designing efficient OER electrocatalysts owing to its key role in electrochemical energy conversion devices. In past few years, lattice oxidation (LOM) arising from anodic redox chemistry has attracted significant attention as it involves a direct O─O coupling thus bypasses thermodynamic limitations traditional adsorbate (AEM). Transition metal‐based oxyhydroxides are generally acknowledged real catalytic phase alkaline media. particular, their low‐dimensional layered structures offer sufficient structural flexibility trigger LOM. Herein, comprehensive overview provided recent advances anion LOM‐based electrocatalysts. Based on analyses electronic structure LOM, strategy proposed activate Possible identification techniques corroboration also reviewed. addition, reconstruction process induced by LOM focused importance multiple situ/operando characterizations highlighted unveil chemical origins To conclude, prospect remaining challenges future opportunities presented.

Language: Английский

---

Simple synthesis of peanut shell-like MoCoFe-HO@CoMo-LDH for efficient alkaline oxygen evolution reaction

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 664, P. 748 - 755

Published: March 6, 2024

Language: Английский

---

Rational construction of MOF derived α-Fe2O3/g-C3N4 composite for effective photocatalytic degradation of organic pollutants and electrocatalytic oxygen evolution reaction

Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy, Journal Year: 2024, Volume and Issue: 310, P. 123972 - 123972

Published: Feb. 1, 2024

In recent years, researchers have been actively investigating metal oxide-based materials with narrow bandgaps due to their potential applications toward wastewater treatment and oxygen evolution reactions (OER). this study, we successfully synthesized g-C3N4 (GCN), Fe2O3, Fe2O3/g-C3N4 (FGCN) using thermal polymerization hydrothermal methods. We characterized the physicochemical structural properties of these through various analytical techniques including XRD, FT-IR, UV-DRS, XPS, FE-SEM, HR-TEM analyses, confirming effective construction FGCN composite catalyst. evaluated photocatalytic activity GCN, catalysts by assessing ability degrade rhodamine B (RhB) crystal violet (CV) exposing them sunlight for 150 min. Among catalysts, demonstrated excellent performance, achieving 93 % 95 degradation RhB CV, respectively, under min exposure. The developed Fe2O3/g-C3N4@Nickel foam (FGCN@NF) catalyst exhibits remarkable OER a reduced Tafel slope 64 mV/dec low overpotential 290 mV at current density 10 mA/cm2 shows durable performance over long time (15 h). Total Organic Carbon (TOC) analysis confirmed mineralization both dyes. remained largely unchanged after five consecutive experiments, demonstrating reusability photostability. Trapping experiments revealed that O2●– is main species responsible decomposition dyes Therefore, development versatile photo/electrocatalytic system can efficiently promote energy conversion in environmental has attracted great attention.

Language: Английский

---

Tuning d–p Orbital Hybridization of NiMoO₄@Mo₁₅Se₁₉/NiSe₂ Core‐Shell Nanomaterials via Asymmetric Coordination Interaction Enables the Water Oxidation Process

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(20)

Published: April 3, 2024

Abstract The electrocatalytic performance of MoNi‐based nanomaterials undergo selenization has garnered significant interest due to their modified electronic structure, while still posses certain challenges for obtained bimetallic selenides. Here, a novel electrocatalyst NiMoO 4 @Mo 15 Se 19 /NiSe 2 core‐shell is constructed promote the desorption OOH * which can facilitate water oxidation process. nanoarrays show that “cores” are mainly nanorods “shells” selenides nanoflakes, super architectures expand more active sites and accelerate electron transfer. Moreover, hybridization interaction between Ni 3d, Mo 4d, 4p orbitals leads an asymmetric distribution electric clouds, decreases adsorption energy transformation oxygen‐containing species. Electrochemical data displays overpotentials only 195 mV, 220 224 mV oxygen evolution reaction (OER) in alkaline freshwater, simulated seawater, natural seawater. current density decay negligible after 100 h stability at about 1.46 V with three‐electrode system low cost unique this work provide constructive solution designing efficient stable OER catalysts future.

Language: Английский

---

Mo-doping and construction of the heterostructure between NiFe LDH and NiSx co-trigger the activity enhancement for overall water splitting

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 664, P. 980 - 991

Published: March 11, 2024

Language: Английский

---

Iron Active Center Coordination Reconstruction in Iron Carbide Modified on Porous Carbon for Superior Overall Water Splitting

Advanced Science, Journal Year: 2024, Volume and Issue: 11(25)

Published: April 24, 2024

Abstract In this work, a novel liquid nitrogen quenching strategy is engineered to fulfill iron active center coordination reconstruction within carbide (Fe 3 C) modified on biomass‐derived nitrogen‐doped porous carbon (NC) for initiating rapid hydrogen and oxygen evolution, where the chrysanthemum tea (elm seeds, corn leaves, shaddock peel, etc.) treated as biomass source Fe C NC. Moreover, original thermodynamic stability changed through corresponding force generated by phase transformation induced with rich vacancies increasing instantaneous temperature drop amplitude. Noteworthy, optimizing intermediate absorption/desorption achieved new phases, coordination, vacancies. The C/NC‐550 (550 refers temperature) demonstrates outstanding overpotential evolution reaction (26.3 mV at −10 mA cm −2 ) (281.4 10 ), favorable overall water splitting activity (1.57 V ). Density functional theory (DFT) calculations further confirm that treatment can enhance intrinsic electrocatalytic efficiently adsorption free energy of intermediates. Overall, above results authenticate open up possibilities obtaining highly electrocatalysts generation green conversion systems.

Language: Английский

---

Design of advanced electrocatalysts for the high-entropy alloys: Principle, progress, and perspective

Journal of Alloys and Compounds, Journal Year: 2023, Volume and Issue: 958, P. 170479 - 170479

Published: May 9, 2023

Language: Английский

---

Optimizing d‐p Orbital Hybridization with Abundant Unfilled Antibonding Orbital in Multi‐Metal Layered Double Hydroxide: Motivating Efficient Oxygen Evolving

Advanced Functional Materials, Journal Year: 2024, Volume and Issue: 34(22)

Published: Feb. 4, 2024

Abstract Manipulating the electronic structure and coordination configuration of heterogeneous electrocatalyst is an advantageous strategy to motivate intrinsic activity but remains challenging. Herein, guided by theoretical mechanism d‐band center valence‐bond theory, high‐valence metal‐modulated nickel‐vanadium layered double hydroxides (M‐NiV LDH, M = Zr, Mo) with interfacial oxygen bridge bonding are rationally designed fabricated, affording a 3D vertically staggered porous nanosheets array network. Benefitting from abundant unfilled antibonding orbitals induced optimized Zr d‐orbital O p‐orbital hybridization, introduction site beneficial accelerate charge transfer kinetics optimize deprotonation OH* as well lower O* → OOH* free energy. As result, as‐prepared Zr‐NiV LDH exhibits promising evolution reaction performance low overpotential favorable long‐term stability. This work provides valuable insights into design electrocatalysts for regulation improvement.

Language: Английский

---

Highly-dispersed 2D NiFeP/CoP heterojunction trifunctional catalyst for efficient electrolysis of water and urea

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 667, P. 543 - 552

Published: April 10, 2024

Language: Английский

---

Advances in the design of highly stable NiFe-LDH electrocatalysts for oxygen evolution in seawater

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 496, P. 153187 - 153187

Published: June 16, 2024

Language: Английский

---