DeCarbon最新文献_第7页

A numerical model for a thermally regenerative electrochemical cycled flow battery for low-temperature thermal energy harvesting 低温蓄热式电化学循环液流电池的数值模型

DeCarbon Pub Date : 2023-06-01 DOI: 10.1016/j.decarb.2023.100007

Sitong Li , Weiguang Wang , Yusong Liu , Hua Tian , Gequn Shu

{"title":"A numerical model for a thermally regenerative electrochemical cycled flow battery for low-temperature thermal energy harvesting","authors":"Sitong Li , Weiguang Wang , Yusong Liu , Hua Tian , Gequn Shu","doi":"10.1016/j.decarb.2023.100007","DOIUrl":"https://doi.org/10.1016/j.decarb.2023.100007","url":null,"abstract":"<div><p>Low-temperature thermal energy (<130 °C) recycling and utilization can significantly increase energy efficiency and reduce CO<sub>2</sub> emissions. Among various technologies for heat-to-electricity conversion, thermally regenerative electrochemical cycle (TREC) has garnered significant attention for remarkable efficiency in thermal energy utilization. The thermally regenerative electrochemical cycled flow battery (TREC-FB) in this paper offers several advantages, including continuous power output and operating without an external power supply. The goal of this investigation is to enhance the understanding of how various parameters affect system performance through simulation, thus optimizing cell performance. In this work, based on the conservation equations and electrochemical equations, the two-dimensional steady models coupled with the flow field and electrochemical field of high-temperature cell and low-temperature cell are constructed separately by COMSOL Multiphysics. The diffusion coefficient and kinetic parameters in the model were obtained by cyclic voltammetry (CV), chronoamperometry (CA) and Tafel electrochemical measurements for subsequent application in the models. Experimental results have confirmed the validity of this model. The main focus of this work is to examine how the system performance is impacted by various factors including current density, electrolyte flow rate, temperature coefficient, porous electrode geometry, heat recuperation efficiency, and temperature difference between hot and cold cells. The results indicate that a larger electrolyte flow rate leads to larger power density, but reduces system efficiency. Smaller porous electrode thickness, higher temperature coefficient, higher heat recuperation efficiency and larger temperature difference between the cells can enhance the system performance. This work offers a new guide for further enhancing TREC-FB performance.</p></div>","PeriodicalId":100356,"journal":{"name":"DeCarbon","volume":"1 ","pages":"Article 100007"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49755240","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Flexible combinatorial ionic/electronic thermoelectric converters to efficiently harvest heat from both temperature gradient and temperature fluctuation 灵活的组合离子/电子热电转换器，有效地从温度梯度和温度波动中收集热量

DeCarbon Pub Date : 2023-06-01 DOI: 10.1016/j.decarb.2023.100003

Qiujian Le, Hanlin Cheng, Jianyong Ouyang

{"title":"Flexible combinatorial ionic/electronic thermoelectric converters to efficiently harvest heat from both temperature gradient and temperature fluctuation","authors":"Qiujian Le, Hanlin Cheng, Jianyong Ouyang","doi":"10.1016/j.decarb.2023.100003","DOIUrl":"https://doi.org/10.1016/j.decarb.2023.100003","url":null,"abstract":"<div><p>It is of great significance to develop novel heat-harvesting technology due to abundant waste heat on earth. Although thermoelectric generators (TEGs) based on the Seebeck effect under temperature gradient has been studied for more than 200 years, their thermoelectric (TE) performance is still not good enough for large-scale practical application. Ionic TE materials can exhibit much higher thermovoltage than electronic conductors, but they can be used to harvest heat merely from temperature fluctuation. In order to take the advantages of these two types of TE materials, we developed flexible combinatorial TE converters (CTECs) with an ionic TE capacitor (ITEC) made of an ionogel and a TEG consisted of poly (3,4-ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS), which were connected in parallel, that is, the electrodes of the ITEC and TEG at the hot end are wired together, while those at the cold end are connected. These CTECs can harvest heat from both temperature gradient by the TEG and temperature fluctuation by the ITEC. Their TE performances are sensitive to the factors like heating/cooling rates, temperature gradient profile and internal resistance of the TEG. The specific average power supplied by the CTEC can be up to 4.7 times as that of the control TEG with PEDOT:PSS. Moreover, the TE performance can be further improved by combining an ITEC with a TEG consisted of both <em>p</em>- and <em>n</em>-type legs in series, which can generate a specific average power as 5.8 times as the CTECs with the TEG of only one p-type leg.</p></div>","PeriodicalId":100356,"journal":{"name":"DeCarbon","volume":"1 ","pages":"Article 100003"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49760423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new platform for clean energy and sustainable environment in the new era of decarbonization 脱碳新时代的清洁能源与可持续环境新平台

DeCarbon Pub Date : 2023-06-01 DOI: 10.1016/j.decarb.2023.100001

Qiang Liao, Kuan Sun, John Wang

引用次数: 0

Binary hole transport layer enables stable perovskite solar cells with PCE exceeding 24% 双空穴传输层使得PCE超过24%的钙钛矿太阳能电池稳定

DeCarbon Pub Date : 2023-06-01 DOI: 10.1016/j.decarb.2023.100004

Xiao Chen , Bing Guo , Zeyu Zhang , Bo Zhang , Xinzhi Zu , Nabonswende Aida Nadege Ouedraogo , Jiyeon Oh , Yongjoon Cho , George Omololu Odunmbaku , Kun Chen , Yongli Zhou , Shanshan Chen , Changduk Yang , Juan Du , Kuan Sun

{"title":"Binary hole transport layer enables stable perovskite solar cells with PCE exceeding 24%","authors":"Xiao Chen , Bing Guo , Zeyu Zhang , Bo Zhang , Xinzhi Zu , Nabonswende Aida Nadege Ouedraogo , Jiyeon Oh , Yongjoon Cho , George Omololu Odunmbaku , Kun Chen , Yongli Zhou , Shanshan Chen , Changduk Yang , Juan Du , Kuan Sun","doi":"10.1016/j.decarb.2023.100004","DOIUrl":"https://doi.org/10.1016/j.decarb.2023.100004","url":null,"abstract":"<div><p>Hygroscopic dopant in hole transport layer (HTL) is a key factor contributing to moisture-induced perovskite degradation and the resulting performance loss over time. This poses obstacles to the commercialization of perovskite solar cells (PSCs). Herein, we mixed two popular hole transport materials, i.e., [2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)9,9′-spirobifluorene] (Spiro-OMeTAD) and poly (3-hexylthiophene-2,5-diyl) (P3HT), to form a binary mixed HTL. Due to the presence of hydrophobic P3HT component, the mixed HTL exhibits improved moisture resistance. In addition, P3HT demonstrates a great ability to interact with the dopants, which changes π-π packing orientation of P3HT from edge-on to face-on and improves its crystallinity, thus increasing hole mobility and hole extraction capability of the mixed HTL. As a result, PSCs equipped with the Spiro-OMeTAD/P3HT mixed HTL exhibit a champion power conversion efficiency (PCE) up to 24.3% and superior operational stability. The cells without encapsulation can maintain 90% initial efficiency after storage in dark ambient conditions (30% RH) for 1200 h. These results suggest that constructing Spiro-OMeTAD/P3HT mixed HTL is a promising strategy to meet the future photovoltaic applications demands with low-cost as well as excellent efficiency and device stability.</p></div>","PeriodicalId":100356,"journal":{"name":"DeCarbon","volume":"1 ","pages":"Article 100004"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49754992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3