Molten Salt Assisted Ni‐Doped α‐FeOOH on Regulating Spin State for Efficient Oxygen Evolution Reactions DOI
Shan Jiang, Qing Zhao, Shuo Liu

et al.

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

Published: April 7, 2025

Abstract α‐FeOOH is a promising catalyst for oxygen evolution reaction (OER). However, owing to the high spin state (HS, t 2g 3 e g 2 ) of Fe 3+ in typical structure, bonding strength oxygen‐containing intermediates are usually too strong. In this work, successful synthesis intermediate (IS) structure on iron foam (IF) by introducing Ni atom reported. Refined structural analysis and theoretical calculations reveal that doped‐Ni enlarged d orbital splitting energy, thus converting crystal field stable HS state. The IS optimized adsorption energy reduced barrier rate‐determining step (RDS, O* OOH*). Moreover, doped generation 4+ during OER, combined with amorphous layer formed molten salt method, inhibiting dissolution Fe. as‐obtained exhibited excellent OER activity an overpotential 178 mV at 10 mA cm −2 Tafel slope 27 dec −1 , which outperforms those state‐of‐the‐art oxyhydroxides catalysts. paper, fast efficient method construction low‐cost high‐activity iron‐based provided.

Language: Английский

Advances in Oxygen Evolution Reaction Electrocatalysts via Direct Oxygen–Oxygen Radical Coupling Pathway DOI Creative Commons
Chengli Rong, Xinyi Huang, Hamidreza Arandiyan

et al.

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

Published: Jan. 15, 2025

Abstract Oxygen evolution reaction (OER) is a cornerstone of various electrochemical energy conversion and storage systems, including water splitting, CO 2 /N reduction, reversible fuel cells, rechargeable metal‐air batteries. OER typically proceeds through three primary mechanisms: adsorbate mechanism (AEM), lattice oxygen oxidation (LOM), oxide path (OPM). Unlike AEM LOM, the OPM via direct oxygen–oxygen radical coupling that can bypass linear scaling relationships intermediates in avoid catalyst structural collapse thereby enabling enhanced catalytic activity stability. Despite its unique advantage, electrocatalysts drive remain nascent are increasingly recognized as critical. This review discusses recent advances OPM‐based electrocatalysts. It starts by analyzing mechanisms guide design Then, several types novel materials, atomic ensembles, metal oxides, perovskite molecular complexes, highlighted. Afterward, operando characterization techniques used to monitor dynamic active sites examined. The concludes discussing research directions advance toward practical applications.

Language: Английский

Citations

4
Mixed Ionic Conductor Brings Extra Gain in Oxygen-Evolving Activity of Nife Hydroxide Electrocatalyst at Practical Working Temperature DOI
Lu Li, Liqi Bai,

Sixuan She

et al.

Published: Jan. 1, 2025

Industrial water electrolysis typically occurs at temperatures higher than ambient. The anodic oxygen evolution reaction (OER) in is inherently temperature-dependent, with enhancements thermodynamics and kinetics temperatures. However, it often overlooked that material properties elevated can differ significantly from those room temperature. In this study, NiFe-based layered double hydroxide (LDH)/CeO2 utilized as electrocatalyst for both ambient- elevated-temperature water/seawater electrolysis. optimal catalyst displays favorable conductivity thus enhanced OER activity. partial coverage of LDH CeO2 effectively mitigates direct chlorine adsorption. Additionally, its high proton prevents accumulation within interlayers ensures stability. Notably, the mixed ionic conductivities temperature contribute to significant improvements performance. This study underscores effectiveness employing conductors highlights importance characterizing process under practical applications.

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
Mixed ionic conductor brings extra gain in oxygen-evolving activity of NiFe hydroxide electrocatalyst at practical working temperature DOI Creative Commons
Lu Li, Liqi Bai,

Sixuan She

et al.

Applied Catalysis B Environment and Energy, Journal Year: 2025, Volume and Issue: unknown, P. 125271 - 125271

Published: March 1, 2025

Language: Английский

Citations

0
Molten Salt Assisted Ni‐Doped α‐FeOOH on Regulating Spin State for Efficient Oxygen Evolution Reactions DOI
Shan Jiang, Qing Zhao, Shuo Liu

et al.

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

Published: April 7, 2025

Abstract α‐FeOOH is a promising catalyst for oxygen evolution reaction (OER). However, owing to the high spin state (HS, t 2g 3 e g 2 ) of Fe 3+ in typical structure, bonding strength oxygen‐containing intermediates are usually too strong. In this work, successful synthesis intermediate (IS) structure on iron foam (IF) by introducing Ni atom reported. Refined structural analysis and theoretical calculations reveal that doped‐Ni enlarged d orbital splitting energy, thus converting crystal field stable HS state. The IS optimized adsorption energy reduced barrier rate‐determining step (RDS, O* OOH*). Moreover, doped generation 4+ during OER, combined with amorphous layer formed molten salt method, inhibiting dissolution Fe. as‐obtained exhibited excellent OER activity an overpotential 178 mV at 10 mA cm −2 Tafel slope 27 dec −1 , which outperforms those state‐of‐the‐art oxyhydroxides catalysts. paper, fast efficient method construction low‐cost high‐activity iron‐based provided.

Language: Английский

Citations

0