Facile Microwave Synthesis of Kilogram‐Scale Electrocatalysts with Nanocarbons Bridged Cobalt Active Sites for Enhanced Oxygen Electrocatalysis

Advanced Energy Materials, Год журнала: 2025, Номер unknown

Опубликована: Март 30, 2025

Abstract Oxygen reductions and evolution reactions (ORR/OER) are pivotal electrochemical processes in fuel cells metal‐air batteries, yet the rapid, large‐scale production of efficient ORR/OER electrocatalysts remains challenging. Herein, a groundbreaking microwave‐synthesis strategy is presented that enables rapid facile preparation kilogram‐scale electrocatalysts. The unique microwave irradiation generates instantaneous thermal energy, facilitating formation nano‐carbon bridges interconnect high‐density active sites comprising cobalt single atoms nanoparticles. This innovative architectural configuration significantly enhances kinetics electron/mass transfer maximizing accessibility sites. optimized carbon‐bridged catalyst (CBCo‐800) demonstrates commendable half‐wave potential ( E 1/2 ) 0.86 V versus RHE minimal overpotential difference (Δ 0.696 V. Furthermore, lab‐assembled zinc‐air battery utilizing CBCo‐800 achieved great specific capacity 794 mAh g −1 sustained over 650 h, outperforming commercial Pt/C RuO 2 catalysts. Density functional theory (DFT) calculations elucidate nanocarbon bridge between dual‐active boosts oxygen activation optimizes adsorption/desorption dynamics *OH/*OOH intermediates, thereby lowering energy barriers for ORR/OER. study offers solution producing site materials, also establishes robust platform mass high‐performance

Язык: Английский

Entropy‐Increase Assisted Anti‐Sintering for Synthesis of High‐Loaded Pt Intermetallic Compounds as Electrocatalysts in PEMFCs

Advanced Functional Materials, Год журнала: 2025, Номер unknown

Опубликована: Май 15, 2025

Abstract High‐loaded Pt intermetallic compounds (IMCs) present the practical application potential in low‐Pt PEM fuel cells while ordering transformation under high temperature inevitably leads to severe sintering of high‐density IMC nanoparticles (NPs), thus decayed oxygen reduction reaction (ORR) performance. Herein, an entropy‐increase assisted anti‐sintering concept is proposed fundamentally reduce surface energy NPs by increasing mixing entropy, hindering migration and coalescence NPs. Ex/in situ electron microscopy density functional theory (DFT) corroborate that higher entropy pristine NPs, lower energy, smaller average size, more uniform distribution after annealing. The prepared high‐entropy (Pt‐HEI@Pt/C) demonstrates metal loading (40.53 wt.%) small particle size (≈3.15 nm), which endow it with excellent ORR activity mass ([email protected], 0.65 A mg −1 ) durability over 20k potential‐cycling. Membrane electrode assembly integrated this catalyst delivers a peak power 0.96 W cm −2 exceptional stability (12.5% decline MA) H2‐air condition at 0.1 . DFT reveals reinforced strain regulation effect HEI core on shell, optimizes *OOH adsorption elevates barrier dissolution, simultaneously enhancing intrinsic durability.

Язык: Английский

Charge regulation through rare earth metal oxides for single-atomic/cluster Co-based electrocatalysts towards boosting oxygen reduction reaction

Applied Catalysis B Environment and Energy, Год журнала: 2025, Номер unknown, С. 125493 - 125493

Опубликована: Май 1, 2025

Язык: Английский