The effect of surface area and dopant percentage on hydrogen storage of Pt@ac loaded activated carbon and Cu-BTC composites

Abstract

Hydrogen storage as part of a hydrogen energy system needs to be investigated deeply for a common usage of the system. Many alternative hydrogen storage media have been investigated in the last decade to solve efficient hydrogen storage problems. Storing hydrogen in adsorbents physically is a significant solution. Carbon based materials and framework structured metal-organic compounds also have intense attention for hydrogen storage by physical adsorption. In this work, the effect of surface area and dopant percentage on hydrogen storage have been emphasized. Different amounts of platinum loaded with activated carbon as the dopant is milled with the activated carbon and Cu-BTC as matrix materials. It was found that the increased amount of dopant caused more adsorption on the adsorbent surfaces. Thus, the hydrogen storage properties increased. But, the excess amount of additives decreases the micro-porosity by way of the hydrogen storage. At 4 wt. % of the additive, platinum loaded activated carbon, increases the hydrogen uptake approx. 10 and 15% in activated carbon and Cu-BTC respectively. On the contrary, 10 wt. % of the additive decreases the hydrogen uptake approx. 2 and 25% of adsorbents in the same order.