The Preparation And Performance Study On Electrode Materials Of Coke Powder Activated Carbon And Its Composites

Coke powder is different from carbonaceous porous materials, which has the characteristics of high ash content, complex components, compact structures and high graphitization degree. From the point of reuse the wastes, coke powder is focused widely for the characteristics of easy source, lower price, etc. At present, the recycle of coke powder which prepared by alkali activation mainly used in wastewater treatment and so on, however, which used in electrode materials had few reports. The purpose of preparation of coke powder activated carbons (CPACs) electrode materials is that it expands the application field of coke powder resources, protects the ecological environment and improves the utilization rate and economic benefit of coke powder.The electrode materials of coke powder activated carbon and its composites were prepared via certain methods in this subject. And we investigated the electrochemical performance of electrode materials under the different conditions of preparation and measurement, and then determining the optimal requirements. Main content as follows:(1) Coke powder as raw materials, we prepared CPACs by pretreatment via HNO3and activated through dipping-calcined activation method by the modifier of KOH. And we investigated the influence of electrochemical performance of electrode materials under the different activated temperature and time. It was concluded that coke powder activated carbons have certain good pore structure and relative large specific surface area characterized by field emission scanning electron microscopy (FESEM) and BET, respectively. And we could obtain that thay had some metallic oxides and certain graphitization structure by energy dispersive spectrometer (EDS) and X-ray diffraction (XRD). The specific capacitance of CPAC which prepared in the activated temperature of800℃and activated time reaches211F/g, and it also exhibited a good electrochemical performance.(2) The composite electrode materials of CPAC-800℃-3h/Al-substituted Ni(OH)2was synthesized successfully through the method of co-precipitation, and we investigated the influence of electrochemical performance of electrode materials under the different of doping quantity of aluminium and the ratio of CPAC-800℃-3h to nickel. The results proved that the composite electrode materials were schistose or petaliform and the crystal form was α-Ni(OH)2characterized by FESEM and XRD, respectively. The specific capacitance of the composite electrode material which the doping quantity of aluminium was4%and the ratio of CPAC-800℃-3h to nickel was1:1could reach1173.6F/g, and the electrochemical performance of electrode material was relative optimum.(3) The composite electrode materials of CPAC-800℃-3h/a-Co(OH)2was prepared by the method of the Sol-Gel, and we confirmed that the influence of electrochemical performance of electrode materials under the different composite quantity of Cobalt. The results proved that the composite electrode materials had flower-like structure characterized by FESEM and the crystal form was a-Co(OH)2via XRD. The results of electrochemical measurement showed that the specific capacitance of the composite electrode material which the compositing quantity of Cobalt was30%could reach472.3F/g, it exhibited relative good electrochemical performance.(4) The composite electrode materials of precursor were prepared by the method of the Sol-Gel, and then obtaining CPAC-800℃-3h/Mn3O4nanorods. We investigated the influence of electrochemical performance of electrode materials of precursor under the different composite quantity of manganese. And we also confirmed that the influence of electrochemical performance and apparent morphology on electrode materials under the different calcined temperature and time. The results showed that the composite electrode materials had nano-rod structure characterized by FESEM and the crystal form was Mn3O4mischcrystal by XRD. The results of electrochemical measurement proved that the composite electrode material of precursor had a good electrochemical performance when the compositing quantity of manganese, and the specific capacitance of composite electrode material of CPAC-800℃-3h/Mn3O4nanorods which prepared by calcined temperature of500℃and calcined time of3h could achieve277F/g, and the electrochemical performance of electrode material was relative optimum.