Effects of ball milling and additives (activated carbon and copper) on hydrogen absorption characteristics of ZK60 alloy
Journal
Materials Chemistry and Physics
Journal Volume
271
Date Issued
2021
Author(s)
Abstract
Zk60 commercial magnesium alloy was used as hydrogen storage materials to investigate the effects of milling time and different weight percentages of additives (activated carbon, copper) on hydrogen absorption characteristics. The mechanically removed chips of ZK60 were blended with additives for different hours using high energy ball milling. The rate of hydrogenation was calculated by Sievert's apparatus at different temperatures for five cycles. The hydrogen absorption was found maximum (4.2 wt%) at 350 °C for 15 h of ball milling in monolithic ZK60. The addition of 5 wt% activated carbon enhances the hydrogen absorption capacity to 7 wt% at the sorption temperature of 300 °C. The addition of copper has reduced the absorption kinetics and increased the hydrogen capacity to 4.5 wt% at 350 °C. The addition of 5 wt% activated carbon has less endothermic peak (379 °C) than that of ZK60 with 5 wt% copper, which has an endothermic peak of 405 °C. The microstructural observations indicate that ball milling has reduced the grain size to 22 nm after 20hr of milling time. The addition of copper has produced new phases (CuMg2 and CuMgZn). ? 2021 Elsevier B.V.
Subjects
Ball milling
Differential scanning calorimetry
Hydrogen absorption capacity
Hydrogen storage materials
ZK60-Activated carbon-copper alloy
Activated carbon
Additives
Binary alloys
Copper
Hydrogen storage
Magnesium alloys
Milling (machining)
Zinc alloys
Absorption characteristics
Endothermic peaks
Hydrogen absorption
Milling time
Scanning calorimetry
Weight percentages
ZK60 alloy
Zk60-activated carbon-copper alloy
Copper alloys
SDGs
Type
journal article