Assembly and Valence Modulation of Ordered Bimetallic MOFs for Highly Efficient Electrocatalytic Water Oxidation DOI Creative Commons

Yaling Wu,

Zhaopeng Sun, Yingying Chen

et al.

Molecules, Journal Year: 2024, Volume and Issue: 29(24), P. 5845 - 5845

Published: Dec. 11, 2024

Metal synergy can enhance the catalytic performance, and a prefabricated solid precursor guide ordered embedding, of secondary metal source ions for rapid synthesis bimetallic organic frameworks (MM'-MOFs) with stoichiometric ratio 1:1. In this paper, Co-MOF-1D containing well-defined binding sites was synthesized by mechanical ball milling, which used as template induced introduction Fe to successfully assemble Co1Fe1-MOF-74@2 (where @2 denotes template-directed MOF-74). Its electrocatalytic performance is superior that conventional one-step-synthesized Co1Fe1-MOF-74@1 @1 one-step MOF-74), two sources, Co Fe, close Meanwhile, iron valence states (FeII FeIII) in were further regulated obtain materials Co1Fe1(II)-MOF-74@2 Co1Fe1(III)-MOF-74@2. The electrochemical test results confirm state has better than Co1Fe1(III)-MOF-74@2 oxygen evolution reaction (OER) process. This phenomenon related gradual increase Co1Fe1(II)-MOF-74@2, promotes continuous improvement MOF before reaching optimal steady makes OER reach optimum when FeII/FeIII mixed-valence reaches certain proportion. provides new idea directed optimization highly efficient catalysts.

Language: Английский

Dual Doping in Precious Metal Oxides: Accelerating Acidic Oxygen Evolution Reaction DOI Open Access

Guoxin Ma,

Fei Wang, Rui Jin

et al.

International Journal of Molecular Sciences, Journal Year: 2025, Volume and Issue: 26(4), P. 1582 - 1582

Published: Feb. 13, 2025

Developing a highly active and stable catalyst for acidic oxygen evolution reactions (OERs), the key half-reaction proton exchange membrane water electrolysis, has been one of most cutting-edge topics in electrocatalysis. A dual-doping strategy optimizes electronic environment, modifies coordination generates vacancies, introduces strain effects through synergistic effect two elements to achieve high catalytic performance. In this review, we summarize progress dual doping RuO2 or IrO2 OERs. The three main mechanisms OERs are dicussed firstly, followed by detailed examination development history catalysts, from experimentally driven systems machine learning (ML) theoretical screening systems. Lastly, provide summary remaining challenges future prospects, offering valuable insights into

Language: Английский

Citations

3
Be Aware of Transient Dissolution Processes in Co3O4 Acidic Oxygen Evolution Reaction Electrocatalysts DOI Creative Commons
Tatiana Priamushko, Evanie Franz, Anja Logar

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 14, 2025

Recently, cobalt-based oxides have received considerable attention as an alternative to expensive and scarce iridium for catalyzing the oxygen evolution reaction (OER) under acidic conditions. Although reported materials demonstrate promising durability, they are not entirely intact, calling fundamental research efforts understand processes governing degradation of such catalysts. To this end, work studies dissolution mechanism a model Co3O4 porous catalyst different electrochemical conditions using online inductively coupled plasma mass spectrometry (online ICP-MS), identical location scanning transmission electron microscopy (IL-STEM), differential (DEMS). Despite high thermodynamics tendency reflected in Pourbaix diagram, it is shown that cobalt kinetics sluggish can be lowered further by modifying protocol. For latter, identified study, several (electro)chemical pathways lead must considered. Hence, uncovers transient character provides valuable insights help stability already published works facilitate knowledge-driven design novel, stable, abundant catalysts toward OER environment.

Language: Английский

Citations

2
Advances in rare earth catalysts for small molecule electrosynthesis☆ DOI

Junfeng Du,

Jing Yu,

Chaohui Guan

et al.

Journal of Rare Earths, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 1, 2025

Language: Английский

Citations

1
Proton Exchange Membrane Water Splitting: Advances in Electrode Structure and Mass‐Charge Transport Optimization DOI Creative Commons
Wenting Feng, Bin Chang, Yuanfu Ren

et al.

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

Published: March 4, 2025

Abstract Proton exchange membrane water electrolysis (PEMWE) represents a promising technology for renewable hydrogen production. However, the large‐scale commercialization of PEMWE faces challenges due to need acid oxygen evolution reaction (OER) catalysts with long‐term stability and corrosion‐resistant electrode assemblies (MEA). This review thoroughly examines deactivation mechanisms acidic OER crucial factors affecting assembly instability in complex environments, including catalyst degradation, dynamic behavior at MEA triple‐phase boundary, equipment failures. Targeted solutions are proposed, improvements, optimized designs, operational strategies. Finally, highlights perspectives on strict activity/stability evaluation standards, situ/operando characteristics, practical electrolyzer optimization. These insights emphasize interrelationship between catalysts, MEAs, activity, stability, offering new guidance accelerating systems.

Language: Английский

Citations

1
Tailoring Coordinated Steps with Ni-Substituted Co3o4 Asymmetric Active Unit for Durable and Efficient Acidic Water Oxidation DOI
Yue Qin, Lili Guo, Chang Liu

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
A Dual-Function Fe-Doped Co3O4 Nanosheet Array for Efficient OER and HER in an Alkaline Medium DOI Creative Commons
Yibo Su, Bo Liu,

Zijun Shi

et al.

Molecules, Journal Year: 2025, Volume and Issue: 30(5), P. 1046 - 1046

Published: Feb. 25, 2025

The electrocatalysts of heteroatom-doped non-precious metal oxide materials are great significance for efficient and low-cost electrochemical water-splitting systems. Herein, an innovative Fe-doped Co3O4 nanoflake (Fe-Co3O4/NF) on nickel foam has been developed, which exhibits excellent electrocatalytic activity both hydrogen evolution reactions (HERs) oxygen (OERs). Benefiting from the synergy charge redistribution d-band center shift caused by doping engineering, as-obtained Fe-Co3O4/NF shows HER (η10 = 196 mV) OER 290 activities with low Tafel slopes (109 mV dec-1 49 OER, respectively) stability. This work provides effective method designing synthesizing bifunctional high stability hybrids HER/OER.

Language: Английский

Citations

0
Recent advances in lanthanide-based materials for oxygen evolution reaction: Challenges and future prospects DOI

Sheraz Muhammad,

Lixia Wang,

Zhiyang Huang

et al.

Coordination Chemistry Reviews, Journal Year: 2025, Volume and Issue: 534, P. 216573 - 216573

Published: March 4, 2025

Language: Английский

Citations

0
Synergistic Modulation of Multisite Electronic States via Erbium Doping and NiCoP Hybridization for Enhanced Anion Exchange Membrane Water Splitting DOI
Fan Zhang, Huigang Zhang, Weiwei Han

et al.

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

Published: March 6, 2025

Water dissociation in anion exchange membrane water electrolysis (AEMWE) faces significant energy barriers, posing a challenge for reducing cell voltage. Herein, we engineered CoP nanosheets by doping Er and hybridizing with NiCoP to optimize local electronic states accelerate H2O during the hydrogen evolution reaction. The resulting Er0.1-CoP/NiCoP catalyst achieves low overpotential of 154 mV at -500 mA cm-2 1.0 M KOH. An AEM electrolyzer comprising an Er0.1-CoP/NiCoP@NF cathode demonstrates voltage 1.672 V stability exceeding 1000 h 500 (50 °C). Characterization, density functional theory (DFT) calculations, ab initio molecular dynamics (AIMD) simulations reveal that hybridization synergistically modulate charge distribution across multisites, shifting p-band centers away from Fermi level. These adjustments free H* adsorption (ΔGH*) improve OH*/H2O* adsorption, thereby facilitating H2 evolution.

Language: Английский

Citations

0
One-Step Preparation of Trinary Co(III)/Co(II)/Co(0) Bifunctional Catalysts with Controllable Co Valence Distribution via Solution Combustion Synthesis and Its Application to Oxygen Reduction and Evolution in Zinc–Air Batteries DOI
Chuandong Zuo, Hui Liu,

Yihuan Wang

et al.

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: May 2, 2025

Regulating the electronic structure and chemical valence of active site for electrocatalysis is highly crucial challenging. In this work, a cost-effective facile strategy regulating cobalt distribution through one-step solution combustion synthesis via nitrate (oxidizer) glycine (fuel) was developed to prepare bifunctional Co(III)/Co(II)/Co(0) catalyst oxygen reduction reaction (ORR) evolution (OER) in zinc-air battery. Experimental findings show that when increasing fuel/oxidizer ratio φ, composition synthesized gradually changes from binary Co(III)/Co(II) trinary Co(III)/Co(II)/Co(0), average Co keeps decreasing. As content Co(II)/Co(0) increases, ORR performance sample improves. The at φ = 1.2 shows best catalytic activity employed assemble rechargeable Overall, compared with published data, proposed has comparable ORR/OER stability, an excellent battery life, efficiency, stability (up 160 h). This work provides promising pathway designing state non-noble cobalt-based catalysts, which can be easily prepared on large scale low cost used various technologies involved OER reactions.

Language: Английский

Citations

0
Surface coverage and reconstruction analyses bridge the correlation between structure and activity for electrocatalysis DOI Creative Commons
Zhongyuan Guo, Tianyi Wang, Jiang Xu

et al.

Chemical Communications, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Electrocatalysis is key to realizing a sustainable future for our society. However, the complex interface between electrocatalysts and electrolytes presents an ongoing challenge in electrocatalysis, hindering accurate identification of effective/authentic structure-activity relationships determination favourable reaction mechanisms. Surface coverage reconstruction analyses are important address each conjecture and/or conflicting viewpoint on surface-active phases their corresponding electrocatalytic origin,

Language: Английский

Citations

3