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

Carboxyl‐CNTs Act as “Defensive Shield” to Boost Proton Insertion for Stable and Fast‐Charging Aqueous Zn‐Mn Batteries DOI Open Access
Yanchen Fan, Meng Xu, Qi Li

et al.

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

Published: March 13, 2025

Abstract Proton insertion mechanism with fast reaction kinetics is attracting more and attention for high‐rate durable aqueous Zn─MnO 2 batteries. However, hydrated Zn 2+ accompanied Jahn–Teller effect Mn 3+ disproportionation generally leads to sluggish rate capability irreversible structure transformation. Here, carboxyl‐carbon nanotubes supported α‐MnO nanoarrays (C─MnO ) cathode successfully fabricated by a convent grinding process high‐performance Specifically, the (CNTs) skeleton endows shorter ion diffusion route active sites proton adsorption, benefiting electron transport reversible evolution of MnO . More importantly, electronegative carboxyl groups Mn─O─C interfacial bonds can effectively restrain dissolution shuttle improved structural integrity redox reactivity. Consequently, C─MnO exhibits high capacity, superior capability, outstanding cycling stability over 10 000 cycles. Even at ultra‐high mass loading (20 mg cm −2 ), Zn//C─MnO punch cell displays excellent capacity (202 mAh) 94.5% retention after 114 cycles, providing new insights practical application advanced Zn‐Mn

Language: Английский

Citations

0
Stabilization of Cu+ Sites in Cu2O-PdO Heterostructures via Orbital Engineering for Enhanced Electrochemical CO2 Reduction to Ethylene DOI

Xiaojun Wang,

Weikun Ren,

Lanlan Shi

et al.

The Journal of Physical Chemistry Letters, Journal Year: 2025, Volume and Issue: unknown, P. 3063 - 3071

Published: March 18, 2025

Electrochemical CO2 reduction to multicarbon products is vital for renewable fuels. While copper catalysts are effective C2+ production, the instability of Cu+ species hinders long-term performance. The present study reports development a Cu2O-PdO heterojunction and investigates influence an unoccupied orbital energy level regulation strategy on stabilization interfacial crystalline Cu2O during reaction (CO2RR). hybrid catalyst showed significant improvement, with 84% higher Faradaic efficiency C2H4, lasted over 7 h, vastly outperforming 2 h benchmark Cu2O. In-situ Raman, ex-situ XRD, theoretical calculations reveal that broadened d-orbital in PdO provides lower electrons, which contributes adjacent ions, high active interface significantly lowers barrier CO-CO dimerization step (2*CO → *OCCO) enhances selectivity activity CO2RR ethylene.

Language: Английский

Citations

0
Insight into the effect of d-orbital electron rearrangements induced by Zr–H interactions: first-principles calculations DOI

Tuman Zhang,

Jianxu Ding, Yangyang Jiang

et al.

Journal of Materials Chemistry A, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

The study elucidates the differences in hydrogen adsorption mechanisms between zirconium and hydride from perspective of orbital bonding, offering a theoretical basis for understanding embrittlement.

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