Few-layer graphene on nickel enabled sustainable dropwise condensation

• 作者: Wei Chang Benli Peng Karim Egab Yunya Zhang Yaqi Cheng Xiaodong Li Xuehu Ma Chen Li
• 来源期刊: 科学通报（英文版）
• 年，卷（期）: 2021,（18）
• 所属期刊栏目: ARTICLES
• 页码范围: 1877-1884
• 页数: 8页
• 语种: 英文

摘要

Condensation is critical for a wide range of applications such as electrical power generation,distillation,natural gas processing,dehumidification and water harvest,and thermal management.Compared with"filmwise" mode of condensation (FWC) prevailing in industrial-scale systems,dropwise condensation(DWC) can provide an order of magnitude higher heat transfer rate owing to drastically reduced thermal resistance from the formation of discrete and mobile droplets.In the past,promoting DWC by controlling surface wetting has attracted wide attention,but DWC highly relies on non-wetting surfaces and only lasts days under practical conditions due to the poor reliability of coatings.Here,we developed nanos-tructured graphene coatings on nickel (Ni) substrates that we can control and enhance the nucleation of water droplets on graphene grain boundaries.Surprisingly,this enables DWC even under normal "wet-ting" conditions.This is contradictory to the widely accepted DWC mechanism.Moreover,the Ni-graphene surface enables exceptional long-term condensation from days to more than 3 years under practical or even more aggressive testing environments.