Efficient electricity production coupled with water treatment via a highly adaptable, successive water-energy synergistic system
Efficient electricity production coupled with water treatment via a highly adaptable, successive water-energy synergistic system
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DOI：
10.1016/j.nanoen.2019.104237
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发表时间：
2020
期刊：
影响因子：
17.6
通讯作者：
Qingyi Zeng;Sheng Chang;Ahmad Beyhaqi;Ming-Qiu Wang;Chun Hu
中科院分区：
文献类型：
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作者：
Qingyi Zeng;Sheng Chang;Ahmad Beyhaqi;Ming-Qiu Wang;Chun Hu
迫切需要可持续的能源和清洁水源。在此，一种新型的高效，经济，可扩展，适应性强，连续的水-能量协同系统（WESS）开发使用串联的灵活和可渗透的光催化电池（PC）单元的电力生产与水处理耦合。每个PC单元组装成一个单片器件，通过集成钛网为基础的，高长径比，单晶，3-D纳米TiO 2纳米线阵列作为光阳极，低成本的尼龙网作为分离器，和碳毡与改进的表面石墨化和石墨N作为有效的氧还原反应阴极。WESS在不同电解质浓度、处理能力、基质浓度和污染物类型下均表现出良好的能量回收和有机物去除效果。值得注意的是，随着单元数量的增加，在功率输出和有机降解方面都实现了非线性和奇妙的改善。我们将这种行为归因于PC单元之间的协同效应，源自串联系统中的介电电位，其加速了光阳极和电极/电解质界面的电荷转移。在这种情况下，9个单元的WESS连续去除>99.8%的甲基橙子，伴随着~10.53 mW cm−2的最大功率密度（Pmax），这是迄今报道的光燃料电池的最高Pmax的~120倍。该系统在长期实施中也表现出出色的稳定性。此外，WESS在真实的阳光下和盐水/海水输入下实现了有效的发电和有机物去除。该新策略将为清洁能源生产和废水资源化领域的水-能关联技术的进一步系统设计铺平道路。
There is an urgent need for sustainable sources of both energy and clean water. Herein, a novel highly efficient, cost-effective, scalable, adaptable and successive water-energy synergistic system (WESS) is developed using in-series flexible and permeable photocatalytic cell (PC) units for electricity production coupled with water treatment. Each PC unit is assembled as a monolithic device by integrating a Ti-mesh-based, high length-diameter ratio, single crystalline, 3–D anatase TiO2nanowire array as a photoanode, a low-cost nylon net as a separator, and a carbon felt with improved surface graphitization and graphitic N as an efficient oxygen reduction reaction cathode. The WESS shows excellent energy recover and organic removal for different electrolyte concentrations, treatment capacities, substrate concentrations, and pollutant types. Notably, non-linear and marvellous improvements are achieved in both power output and organic degradation as the unit number increased. We attribute this behaviour to synergistic effects between the PC units, originating from the interactional potential in the serial system which accelerated the charge transfer of photoanode and electrode/electrolyte interface. In this case, a nine-unit WESS successively removed >99.8% of methyl orange accompanying with a maximum power density (Pmax) of ~10.53 mW cm−2, which was ~120 times as great as the highestPmaxof a photo-fuel-cell reported to date. This system also exhibited outstanding stability in long-term implementations. Moreover, efficient electricity generation and organic removal were achieved for the WESS under real sunlight and with an input of salty/seawater. The present novel strategy will pave the way for further systematic design of water-energy nexus techniques in clean energy production and wastewater resource utilization fields.