MnO_(2)负载碳纳米球的可控制备及其在“摇椅式”电容去离子中的应用

Facial Synthesize of MnO_(2) Coated Carbon Spherefor “Rocking-Chair” Capacitive Deionization

电容去离子(CDI)作为一种新兴的低能耗、绿色环保脱盐技术,受到研究者的广泛关注。近年来,为突破CDI脱盐容量的技术瓶颈,研究者开展了基于法拉第型离子嵌入型电极的法拉第基电容去离子(FDI)研究。然而,FDI虽然发展迅猛,却面临着氯离子去除能力不足、脱盐动力学过程不平衡等问题。针对上问题,采取了材料与器件相结合的研究思路,将温和可控制备的氧化锰负载碳纳米球(CS@MnO_(2))与对称型“摇椅式”电容去离子器件相结合,成功实现了器件脱盐容量(46.16 mg/g)和速率[0.167 mg/(g·s)]的大幅提升,30周期循环和衰减仅13.4%。该工作对FDI体系产业化的推进和应用具有重要意义。

Capacitive deionization(CDI),as an emerging eco-friendly desalination technique with minimum energy requirement,has attracted great attention in the desalination community.In recent years,in order to overcome the technical bottleneck of CDI desalting capacity,faradic-based capacitive deionization(FDI)based on faradic-based material was investigaed.Although developing rapidly,the FDI is plagued by the imbalanced desalination capacity between anode and cathode(Na^(+) vs.Cl^(-) -removal capacity).Herein,an innovative strategy was developed by integrating the advantage of both delicate material design〔MnO_(2) coated carbon sphere(CS@MnO_(2))to enhance the capacitance of MnO_(2)〕with rational cell architecture(symmetrical Rocking-chair CDI to avoid imbalance desalination capacity),and the desalination performance of our system was ultimately enhanced desalination capacity and rate up to 46.16 mg/g and 0.167 mg/(g·s),respecitvley.The decay in 30-cycle cycle is only 13.4%.This work is of great significance to the promotion and application of the industrialization of FDI system.