Electricity Harvesting from Water Evaporation on Hierarchical Pore Gradient Silica Aerogel-Based Generators

被引:2
作者
Tian, Zheyu [1 ]
Chang, Qing [1 ]
Liu, Zhenghong [1 ]
Xue, Chaorui [1 ]
Li, Ning [1 ]
Jia, Suping [1 ]
Fan, Xiangqian [1 ]
Yang, Jinlong [1 ,2 ]
Hu, Shengliang [1 ]
机构
[1] North Univ China, State Key Lab Coal & CBM Comining, Res Grp New Energy Mat & Devices, Taiyuan 030051, Peoples R China
[2] Tsinghua Univ, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
关键词
silica aerogel; pore gradient structure; modification; natural water evaporation; electricity generation;
D O I
10.1021/acsami.4c07729
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this study, the electric energy harvesting capability of the hierarchical pore gradient silica aerogel (HPSA) is demonstrated due to its unique porous structure and inherent hydroxyl groups on the surface. Taking advantage of the positively charged surface of unwashed HPSA credited by the preparation strategy, poly(4-styrene sulfonic acid) (PSS) can be spontaneously adsorbed onto unwashed HPSA and shows gradient distribution due to the pore-gradient structure of HPSA. By virtue of the gradient distribution and the stronger ionization of PSS, PSS-modified HPSA (PSS-HPSA) shows enhanced electricity generation performance from natural water evaporation with an average output voltage of 0.77 V on an individual device. The water evaporation-induced electricity property of PSS-HPSA can be maintained in the presence of a low concentration of salt. The desirable salt resistance capability benefits from the unique 3D hierarchical porous structure of HPSA which ensures rapid water replenishment so as to effectively avoid the salt accumulation. The HPSA-based devices with the advantages of unique porous structure, easy functionalization, good physicochemical stability, good salt resistance capability, and eco-friendliness show great potential as water evaporation-induced electricity generators.
引用
收藏
页码:42468 / 42475
页数:8
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