Polyelectrolyte‐Coated Copper Hexacyanoferrate and Bismuth Oxychloride Electrodes for Efficient Salinity Gradient Energy Recovery in Capacitive Mixing

Energy Technology - Tập 8 Số 1 - 2020
Guangcai Tan1, Xiuping Zhu1
1Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA

Tóm tắt

A mixing entropy battery (MEB) based on a pair of cationic and anionic electrodes is a novel method to extract salinity gradient (SG) energy. However, so far, only precious AgCl electrodes are reported as anionic electrodes in MEBs. Herein, it is demonstrated that bismuth oxychloride (BiOCl) can be an alternative anionic electrode for MEBs to harvest SG energy. In tests with 30 and 1 g L−1 NaCl solutions, the origin MEB with uncoated BiOCl anionic and copper hexacyanoferrate (CuHCF) cationic electrodes produces an energy density of 8 J m−2 and an average power density of 59 mW m−2. To boost the power output, the origin BiOCl and CuHCF electrodes are coated with polyelectrolytes. The energy density (12 J m−2) and average power density (87 mW m−2) of the coated MEB are nearly 50% higher than those of the origin MEB and are stable over 50 cycles, which is comparable and even higher than those with AgCl anionic electrodes. These results indicate that BiOCl can be a cheap alternative to the AgCl anionic electrode, and polyelectrolyte coatings can be a cheaper alternative to ion‐exchange membranes in MEBs for efficient SG energy recovery.

Từ khóa


Tài liệu tham khảo

10.1038/174660a0

10.15302/J-ENG-2015046

10.1016/j.apenergy.2018.04.111

10.1021/es104325z

10.1021/ez400117d

10.1021/es8004317

10.3390/e15041388

10.1016/j.jcis.2014.08.070

10.1016/j.electacta.2015.07.069

10.1103/PhysRevLett.103.058501

10.1039/c2ee23036d

10.1021/es100852a

10.1021/es302169c

10.1039/c2ee21548a

10.1021/nl200500s

10.1039/c3ra44902e

10.1039/C5RA03909F

10.1039/C4EE01034E

10.1002/anie.201307314

10.1016/j.jallcom.2016.01.267

10.1039/C7EE00855D

10.1016/j.ensm.2017.02.001

10.1016/j.electacta.2019.134724

10.1039/C4CP03527E

10.1016/j.memsci.2010.03.010

10.1016/j.jelechem.2016.02.041

10.1021/am503079e

10.1038/ncomms1563

10.1016/j.jpowsour.2015.11.065

10.1016/j.jpowsour.2015.10.076

10.1016/j.jpowsour.2016.04.026

10.1039/C7TA05736A

10.1021/ez5003314

10.1039/C2EE23562E

10.1002/cssc.201601656

10.1002/slct.201800312

10.1021/acsomega.9b00863

10.1016/j.memsci.2006.03.025

Thông tin
Thông tin xuất bản

Energy Technology

Tập 8 Số 1

Thông tin tác giả