Co-Ni催化剂的还原动力学

采用硝酸盐为金属源,在淀粉辅助下通过一步热分解法制备了介孔Co_(3)O_(4)-NiO催化剂,在三种不同升温速率条件下,用氢气程序升温还原(H_(2)-TPR)分析技术表征了催化剂的还原性能,计算出初始还原反应活化能为43.6 kJ·mol^(-1),而体相氧化钴和体相氧化镍催化剂的初始还原活化能分别为47.9 kJ·mol^(-1)和49.6 kJ·mol^(-1),介孔Co-Ni催化剂的还原活化能降低与催化剂表面的粒子分散度和相互作用有关.通过对其还原性质的研究,可以为H_(2)-TPR方法研究催化作用机理提供一定的参考.

Possibility of Using Ni-Co Alloy As Catalyst for Oxygen Electrode of Fuel Cell

In recent years, the scale of use of fuel cells （FCs） has been increasing continuously. One of the essential elements that affect their work is a catalyst. Precious metals （mainly platinum） are known for their high efficiency as FC catalysts. However, their high cost holds back the FCs from application on a large scale. Therefore, catalysts that do not contain precious metals are sought. Studies are focused mainly on the search for fuel electrode catalysts, but for the efficiency of FCs also the oxygen electrode catalyst is of great significance. The paper presents an analysis of the possibilitiesof using Ni-Co alloy as a catalyst for the oxygen electrode of the FC.

催化裂解聚丙烯合成石墨烯碳纳米杂化材料及其电化学应用

研究了氧化石墨烯(GO)负载Co-Ni催化剂原位催化聚丙烯(PP)进行三维石墨烯碳纳米杂化材料的合成,同时考察材料作为超级电容器电极的电化学应用。将乙酸钴和乙酸镍按比例加入GO水溶液中,利用聚醚胺400(D-400)将二者还原为氢氧化物并自组装负载在GO表面,制备出GO负载Co-Ni催化剂(GO/Ni-Co)。将GO/Ni-Co熔融共混到PP中,在氮气保护下裂解碳化共混得到石墨烯基碳纳米杂化材料。采用SEM、TEM、XRD和Raman等对其形貌结构进行表征。结果表明:利用该方法可成功制备一种三维石墨烯碳纳米杂化材料(RGO/C)。将所制备的RGO/C应用于超级电容器,在扫描速率为2m V/s时,最大比电容达到595F/g,并且具有良好的循环稳定性。