Lee Jiho, Yoon Hongsik, Lee Jaehan, Kim Taeyoung, Yoon Jeyong
School of Chemical and Biological Engineering, Institute of Chemical Process (ICP), Seoul National University, Gwanak-gu, Daehak-dong, Seoul, 151-742, Republic of Korea.
Department of Civil and Environmental Engineering, Penn State University, University Park, PA, 16802, USA.
ChemSusChem. 2017 Apr 10;10(7):1600-1606. doi: 10.1002/cssc.201601656. Epub 2017 Mar 8.
Salinity-gradient energy (SGE) is a renewable energy source available wherever two solutions with different salinity mix. Capacitive-mixing (Capmix) is a technology that directly extracts the SG potential through the movements of ions in high- and low-concentration solutions. However, the energy-harvesting performance of Capmix needs further improvement. Herein, a hybrid Capmix that consists of a battery and capacitive electrodes is proposed. In this system, sodium ions and anions are captured/released by the metal oxide and carbon electrodes, respectively. The hybrid Capmix extracted an energy density that was approximately three times higher (130 J m ) and exhibited a notable power output (97 mW m ) compared to the previous Capmix using ion-exchange membranes. Furthermore, the hybrid system operated successfully with real river water and seawater. These results suggest that the hybrid Capmix could be a viable option to harvest energy from salinity gradients.
盐度梯度能（SGE）是一种可再生能源，只要两种盐度不同的溶液混合就能获得。电容混合（Capmix）是一种通过高浓度和低浓度溶液中离子的移动直接提取盐度梯度势能的技术。然而，电容混合的能量收集性能需要进一步提高。在此，提出了一种由电池和电容电极组成的混合电容混合装置。在该系统中，金属氧化物电极和碳电极分别捕获/释放钠离子和阴离子。与之前使用离子交换膜的电容混合装置相比，这种混合电容混合装置提取的能量密度高出约三倍（130 J/m³），并展现出显著的功率输出（97 mW/m²）。此外，该混合系统在实际河水和海水中成功运行。这些结果表明，混合电容混合装置可能是从盐度梯度中获取能量的可行选择。
