{"title":"CoFe/N doped biomass-derived carbon as multi-layer porous efficient bifunctional composite for zinc-air battery","authors":"","doi":"10.1016/j.est.2024.114047","DOIUrl":null,"url":null,"abstract":"<div><div>The development of bifunctional electrocatalysts to overcome the slow kinetics of the oxygen reduction reaction (ORR)/the oxygen evolution reaction (OER) is a significant challenge. Herein, Fe<sub>80</sub>-ZIF-67@CN, a CoFe alloy nitrogen-doped multilayer porous carbon electrocatalysts is designed and successful prepared, natural eggshell membrane (ESM) as precursor, Graphitic carbon nitride (G-C<sub>3</sub>N<sub>4</sub>) as nitrogen source, and a small amount of iron and cobalt salts as non-noble metal sources. Due to the synergistic effect between the CoFe alloy and FeN<sub>X</sub>, CoN<sub>X</sub> sites, the Fe<sub>80</sub>-ZIF-67@CN electrocatalysts display a half-wave potential (E<sub>1/2</sub>) of 0.86 V (ORR), an overpotential (E<sub>j10</sub>) of 339 mV (OER), and a potential difference (∆E) of 0.71 V. In addition, the Tafel slopes for the ORR and OER are 90.36 mV dec<sup>−1</sup> and 52.35 mV dec<sup>−1</sup>, respectively. More importantly, the Zn-air battery assembled with Fe<sub>80</sub>-ZIF-67@CN exhibits a large power density of 126.47 mW cm<sup>−2</sup>, the open circuit voltage (OCP) of 1.54 V and excellent stability without significant voltage changes even after 176 h, which are superior to that of 20 % Pt/C + RuO<sub>2</sub>. This work paves a new design option for oxygen electrocatalysts for zinc-air batteries.</div></div>","PeriodicalId":15942,"journal":{"name":"Journal of energy storage","volume":null,"pages":null},"PeriodicalIF":8.9000,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of energy storage","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2352152X24036338","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
The development of bifunctional electrocatalysts to overcome the slow kinetics of the oxygen reduction reaction (ORR)/the oxygen evolution reaction (OER) is a significant challenge. Herein, Fe80-ZIF-67@CN, a CoFe alloy nitrogen-doped multilayer porous carbon electrocatalysts is designed and successful prepared, natural eggshell membrane (ESM) as precursor, Graphitic carbon nitride (G-C3N4) as nitrogen source, and a small amount of iron and cobalt salts as non-noble metal sources. Due to the synergistic effect between the CoFe alloy and FeNX, CoNX sites, the Fe80-ZIF-67@CN electrocatalysts display a half-wave potential (E1/2) of 0.86 V (ORR), an overpotential (Ej10) of 339 mV (OER), and a potential difference (∆E) of 0.71 V. In addition, the Tafel slopes for the ORR and OER are 90.36 mV dec−1 and 52.35 mV dec−1, respectively. More importantly, the Zn-air battery assembled with Fe80-ZIF-67@CN exhibits a large power density of 126.47 mW cm−2, the open circuit voltage (OCP) of 1.54 V and excellent stability without significant voltage changes even after 176 h, which are superior to that of 20 % Pt/C + RuO2. This work paves a new design option for oxygen electrocatalysts for zinc-air batteries.
期刊介绍:
Journal of energy storage focusses on all aspects of energy storage, in particular systems integration, electric grid integration, modelling and analysis, novel energy storage technologies, sizing and management strategies, business models for operation of storage systems and energy storage developments worldwide.