Structural, Magnetic and Catalytic Properties of FeCo Nanoparticles Synthesized by Polyol Process

Yıl 2023, Cilt: 13 Sayı: 1&2, 74 - 88, 31.12.2023

Emre Can Tayfun Kaan Erman Doğan Kaya Faruk Karadağ Ahmet Ekicibil

https://doi.org/10.37094/adyujsci.1338847

Öz

Multi-functional FeCo nanoparticles (NPs) exhibit unique structural, magnetic, and catalytic properties, making them versatile materials with potential applications in diverse fields. In this work, we investigated the structural, electrochemical, and magnetic properties of as- prepared FeCo NPs synthesis by polyol method. X-ray diffraction analysis revealed multiphase structures: FeCo and α-Fe2O3 phases and scanning electron microscopy images confirmed spherical-like structures of FeCo NPs with an average size of 12.4 ± 0.1 nm. The electrochemical properties of FeCo NPs were investigated using a three-electrode setup in a 1 M KOH electrolyte at room temperature. The onset potentials for FeCo catalysts were found to be -0.15 V for ORR, 0.25 V for OER, and -1.26 V for HER. Tafel measurements further elucidated the reaction mechanism, revealing corrosion potentials of -0.165 V for ORR and 0.215 V for OER, with Tafel slopes of 228 mV dec-1 and 48 mV dec-1, respectively. A significant increase in magnetization was observed below 25 K in both zero-field-cooled and field-cooled curves, a magnetic transition temperature, Ts, occurs at 15 K, possibly indicating a ferromagnetic-to-antiferromagnetic phase transition. The hysteresis loop measurements revealed coercive field values ranging from 968 Oe at 5 K to approximately 206 Oe at 320 K, indicating a relaxation in magnetic spin orientation with increasing temperature. The saturation magnetization (Ms) values were recorded as 15.2 emu/g under a 5 T magnetic field, and the remanent magnetization (Mr) showed dominant ferromagnetic properties at 5 K with an Mr/Ms ratio indicating soft magnetic behavior. The magnetic susceptibility of FeCo NP exhibited a peak at approximately 25 K, and the Curie-Weiss law provided an estimated θ angle of -9.58°, suggesting antiferromagnetic interactions.

Anahtar Kelimeler

FeCo NPs, Polyol, Structural, Magnetic, Catalytic

Destekleyen Kurum

Cukurova Unıversıty

Proje Numarası

FBA-2021-13479

Poliol Prosesi ile Sentezlenen FeCo nanoparçacıkların Yapısal, Manyetik ve Katalitik Özellikleri

Öz

Çok işlevli FeCo nanoparçacıkları (NP'ler), manyetik, katalitik ve yapısal özelliklerin bir kombinasyonunu sergileyerek, çeşitli alanlarda potansiyel uygulamalara sahip çok yönlü malzemelerdir. Bu çalışmada, poliol yöntemi ile sentezlenen FeCo NP'lerin yapısal, elektrokimyasal ve manyetik özelliklerini araştırdık. X-ışını kırınım analizi, FeCo ve α-Fe2O3 fazlarını gösteren çoklu yapılar ortaya çıkardı ve taramalı elektron mikroskobu görüntüleri, ortalama boyutu 12.4 ± 0.1 nm olan küresel yapıları doğruladı. FeCo NP'lerin elektrokimyasal özellikleri, oda sıcaklığında 1 M KOH elektroliti içinde üç elektrot düzeneği kullanılarak incelendi. FeCo katalizörleri için başlangıç potansiyelleri, ORR (Oksijen indirgeme reaksiyonu) için -0.15 V, OER (Oksijen oluşum reaksiyonu) için 0.25 V ve HER (Hidrojen oluşum reaksiyonu) için -1.26 V olarak bulundu. Tafel ölçümleri, ORR için -0.165 V ve OER için 0.215 V'lik korozyon potansiyellerini ve sırasıyla 228 mV dec-1 ve 48 mV dec-1'lik Tafel eğimlerini ortaya çıkardı. Hem manyetik alanla soğutulmuş hem de manyetik alansız soğutulmuş eğrilerde 25 K'nin altında belirgin bir manyetizasyon artışı gözlendi ve 15 K'de bir manyetik bir geçiş sıcaklığı, Ts, gözlendi, bu da ferromanyetikten antiferromanyetik bir faz geçişini gösterebilir. Histerezis döngüsü ölçümleri, 5 K'de 968 Oe'den 320 K'de yaklaşık 206 Oe'ye kadar olan koersiv alan değerleri göstererek manyetik spin yönelmesinde bir gevşeme olduğunu gösterdi. 5 T manyetik alan altında doyum mıknatıslanması (Ms) değerleri 15.2 emu/g olarak kaydedildi ve 5 K'de kalıcı mıknatıslanma (Mr), domine ferromanyetik özellikleri gösterirken Mr/Ms oranı yumuşak manyetik davranışı gösterdi. Manyetik duyarlılık analizi, yaklaşık 25 K'de bir pik gösterdi ve Curie-Weiss yasası -9.58°'lik tahmini bir θ açısı sağlayarak antiferromanyetik etkileşimleri düşündürdü.

Anahtar Kelimeler

FeCo nanoparçacıklar, Poliol, Yapısal, Manyetik, Katalitik

Proje Numarası

FBA-2021-13479

Kaynakça

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