Feng Zhu , Weishan Cao , Weihao Song , Jiaying Peng , Na Yang , Jin Niu , Feng Wang
{"title":"Biomass-derived carbon prepared through a quadruple-functional-salt approach for application in K-ion capacitors","authors":"Feng Zhu , Weishan Cao , Weihao Song , Jiaying Peng , Na Yang , Jin Niu , Feng Wang","doi":"10.1016/j.cej.2022.137561","DOIUrl":null,"url":null,"abstract":"<div><p>Heteroatom-doped porous carbons are regarded as promising electrodes for K-ion capacitors. However, current synthetic methods suffer from problems of low efficiency and use unsustainable precursors, and this has restricted wide application of these materials. Moreover, the mechanisms of energy-storage by heteroatom-doped porous carbon electrodes in K-ion capacitors are not well understood. In this work, we prepare porous carbons having honeycomb-like hierarchical structures and doped with P/N heteroatoms by using a low-cost fish scale and K<sub>3</sub>PO<sub>4</sub> as precursor and auxiliary, respectively. K<sub>3</sub>PO<sub>4</sub> and its derivatives not only serve as collagen-hydrolysis reagents during the pre-treatment process, but also act as dopants, templates, and activators during the subsequent carbonization process. Deionized water is the only solvent required in the whole synthesis process. The as-prepared carbons were used as electrodes in K-ion capacitors and their energy-storage mechanisms studied by detailed <em>in-situ</em> characterization methods and DFT calculations. The optimized carbon anode and cathode were used to assemble a pouch K-ion capacitor, which showed high energy density (184.6 Wh kg<sup>−1</sup>), high power density (4.8 kW kg<sup>−1</sup>), and long lifetime (retaining 90% of the initial capacity after 10,000 cycles).</p></div>","PeriodicalId":270,"journal":{"name":"Chemical Engineering Journal","volume":null,"pages":null},"PeriodicalIF":13.3000,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"10","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Engineering Journal","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1385894722030480","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 10
Abstract
Heteroatom-doped porous carbons are regarded as promising electrodes for K-ion capacitors. However, current synthetic methods suffer from problems of low efficiency and use unsustainable precursors, and this has restricted wide application of these materials. Moreover, the mechanisms of energy-storage by heteroatom-doped porous carbon electrodes in K-ion capacitors are not well understood. In this work, we prepare porous carbons having honeycomb-like hierarchical structures and doped with P/N heteroatoms by using a low-cost fish scale and K3PO4 as precursor and auxiliary, respectively. K3PO4 and its derivatives not only serve as collagen-hydrolysis reagents during the pre-treatment process, but also act as dopants, templates, and activators during the subsequent carbonization process. Deionized water is the only solvent required in the whole synthesis process. The as-prepared carbons were used as electrodes in K-ion capacitors and their energy-storage mechanisms studied by detailed in-situ characterization methods and DFT calculations. The optimized carbon anode and cathode were used to assemble a pouch K-ion capacitor, which showed high energy density (184.6 Wh kg−1), high power density (4.8 kW kg−1), and long lifetime (retaining 90% of the initial capacity after 10,000 cycles).
期刊介绍:
The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.