A thermoelectric generator comprising selenium-doped bismuth telluride on flexible carbon cloth with n-type thermoelectric properties

Carbon cloth was used as a flexible substrate for bismuth telluride (Bi₂Te₃) particles to provide flexibility and improve the overall thermoelectric performance. Bi₂Te₃ on carbon cloth (Bi₂Te₃/CC) was synthesized via a hydrothermal reaction with various reaction times. After over 12 h, the Bi₂Te₃ particles showed a clear hexagonal shape and were evenly adhered to the carbon cloth. Selenium (Se) atoms were doped into the Bi₂Te₃ structure to improve its thermoelectric performance. The electrical conductivity increased with increasing Se-dopant content until 40% Se was added. Moreover, the maximum power factor was 1300 μW/mK² at 473 K for the 30% Se-doped sample. The carbon cloth substrate maintained its electrical resistivity and flexibility after 2000 bending cycles. A flexible thermoelectric generator (TEG) fabricated using the five pairs of 30% Se-doped sample showed an open-circuit voltage of 17.4 mV and maximum power output of 850 nW at temperature difference ΔT = 30 K. This work offers a promising approach for providing flexibility and improving the thermoelectric performance of inorganic thermoelectric materials for wearable device applications using flexible carbon cloth substrate for low temperature range application.     

Highly active and stable electrocatalytic transition metal phosphides (Ni2P and FeP) nanoparticles on porous carbon cloth for overall water splitting at high current density

Highly active and stable hydrogen production at high current densities is required for practical application of electrocatalytic water splitting. In this study, highly active self-supporting electrodes with excellent durability were designed and developed for high-performance overall water splitting at a high current density. First, a colloid-based dip-coating method using porous carbon cloth (PCC) was introduced to obtain uniformly coated Ni and Fe nanoparticles on a conductive substrate. Then, the desired phase transitions of Ni and Fe to Ni₂P and FeP, respectively, proceeded by thermal phosphidation at optimum temperature. The uniformly interconnected Ni₂P layers on the PCC substrate (Ni₂P@PCC) and FeP layers on the PCC substrate (FeP@PCC) exhibited outstanding oxygen and hydrogen evolution reactions, respectively. When each electrode was adopted as an anode and a cathode for the overall water splitting cell, excellent performance was achieved, with a low operational voltage of 1.76 V and high durability for 100 hours at a high current density of 50 mA cm⁻².     

浅谈碳纤维布加固混凝土中的技术应用

与具体工程相结合,阐述了碳纤维布在加固钢筋混凝土中的应用,介绍了碳纤维布和配套胶的主要性能指标,探讨了碳纤维布在加固工程中的计算方法和施工工艺,从而为设计施工人员提供参考。     

碳纤维加固技术在具体工程中的应用

碳纤维材料加固混凝土结构是一种新型结构加固方法。某商场由于电器故障引起火灾,导致该商场框架梁构件受到一定程度的损伤,危及结构安全,经分析比较多种加固方案,最终采用粘贴碳纤维布对该框架梁进行加固。     

浅谈厂房软基地面处理

采用碎石振动桩处理吹砂地面以及用土工布和塑料排水板加堆载预压是处理加固软基地面行之有效的方法。前者利用挤压原理将松散地面改造为密实度较高的地基。后者是利用砂井的原理，将水排出，让地基先压缩沉降。它们对提高软基的极限强度．增加地基的稳定性。减少地基沉降量有着显著的作用。     

外墙外保温施工技术

简述外墙保温的发展及常见施工方法,分析外保温的优越性;以常用的聚苯乙烯保温板、超轻保温砂浆为例,介绍其外墙外保温施工方法,及外墙外保温体系的性能要求、工程要求。     

施工质量对混凝土砌块墙体裂缝的影响分析

本文通过对混凝土空心砌块填充墙施工中的三大质量通病进行分析,提出材料选择和施工过程的质量控制要点。     

浅谈水南路路堤填筑加固技术

为了尽可能利用膨胀土，保证膨胀土路基的稳定性，结合工程实际对膨胀土路基加固技术进行了探讨，并对填筑材料的要求进行了介绍，有效地解决了工程问题，对实际工程具有一定的指导意义。     

碳纤维布滞后应变的简化计算方法

碳纤维抗弯加固中截面受拉边的初始应变（即碳纤维布的滞后应变）一般不可忽略，而按《碳纤维片材加固修复混凝土结构技术规程》（送审稿）的计算方法却相当繁琐。提出了计算碳纤维布滞后应变的两种简化计算方法，以便于工程应用。     

EPS板外墙外保温技术在现浇混凝土工程中的应用

膨胀型聚苯乙烯泡沫板(EPS)外墙外保温技术具有保温、解决热桥问题、保护外墙、增加建筑物使用面积和便于室内装修等优点。在现浇混凝土工程中应用的主要施工流程为绑外墙和柱钢筋，安装EPS板，支模，浇筑混凝土，处理门窗洞口、变形缝及墙面分格缝，粘贴网格布，抹聚苯砂浆等。为保证施工质量，应采取用聚苯胶堵变形缝、分格缝、洞口边缘缝，用封口胶封严门窗框四周，控制好墙面垂直度等措施。