掺杂天然钙的LaCoFeO钙钛矿作为析氧反应和氧还原反应的双功能电催化剂。

LaCoFeO perovskites doped with natural Ca as bifunctional electrocatalysts for oxygen evolution and reduction reactions.

作者信息

Saad Islam, El-Dek S I, Eissa M F, Assaud Loïc, Amin Rafat M

机构信息

Physics Department, Faculty of Science, Beni-Suef University Beni-Suef 62511 Egypt

Materials Science and Nanotechnology Department, Faculty of Postgraduate Studies for Advanced Sciences, Beni-Suef University Beni-Suef 62511 Egypt.

出版信息

RSC Adv. 2024 Aug 29;14(38):27488-27503. doi: 10.1039/d4ra04105d.

DOI:10.1039/d4ra04105d

PMID:39221128

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11360433/

Abstract

Perovskite oxides are promising electrocatalysts for various energy applications due to their exceptional catalytic activity, flexible architecture, and low cost. In this study, LCFO was doped with different ratios of Ca from eggshells, resulting in dual-purpose electrocatalysts for oxygen reduction and evolution processes. The nanoparticles were characterized using various techniques, including Brunauer-Emmett-Teller analysis and XRD. Results clarified the relative surface area and roughness, increasing with Ca doping. LCFO also demonstrated highly magnetic properties, improved charge transfer, catalytic activity, and long-term durability. The results demonstrated the perovskite's cost-effectiveness as a bifunctional electrocatalyst, and the role of Ca in enhancing its properties. LaCaCoFeO(LCCFO-0.4) showed higher magnetic properties ( = 13.36 emu g and = 2.54 emu g). The LCFO sample showed a current density of 5.13 mA cm and 3 mA cm for OER and ORR respectively, at 1.7 V and 0.57 V ( RHE). The LCFO electrochemical active surface area is 0.033 cm.

摘要

钙钛矿氧化物因其卓越的催化活性、灵活的结构和低成本，在各种能源应用中是很有前景的电催化剂。在本研究中，LCFO被掺杂了来自蛋壳的不同比例的钙，从而得到了用于氧还原和析氧过程的双功能电催化剂。使用包括布鲁诺尔-埃米特-泰勒分析和XRD在内的各种技术对纳米颗粒进行了表征。结果明确了相对表面积和粗糙度随钙掺杂而增加。LCFO还表现出高磁性、改善的电荷转移、催化活性和长期耐久性。结果证明了钙钛矿作为双功能电催化剂的成本效益，以及钙在增强其性能方面的作用。LaCaCoFeO（LCCFO-0.4）表现出更高的磁性（( \mu_s = 13.36 emu g)和( \mu_{eff}= 2.54 emu g)）。LCFO样品在( 1.7 V)和( 0.57 V)（相对于可逆氢电极）时，析氧反应（OER）和氧还原反应（ORR）的电流密度分别为( 5.13 mA cm)和( 3 mA cm)。LCFO的电化学活性表面积为( 0.033 cm)。