In order to improve the electro-conductibility of new energy storage material-manganese carbonate(MnCO3) and the properties apply to supercapacitors. we produce MnCO3/CB composite at room temperature by using a simple and mild liquid phase deposition method. Using dilute HNO3 to purify and activate the CB(carbon black). then put the handled CB into NH4HCO3/MnSO4 mixed solution for liq... https://ashleyshomestores.shop/product-category/5-piece-outdoor-firepit-chat-set/