Catalytic effect of EG and MoS ₂ on hydrolysis hydrogen generation behavior of high‐energy ball‐milled Mg‐10wt.%Ni alloys in NaCl solution—A powerful strategy for superior hydrogen generation performance

Abstract

Summary In this study, the metallurgical melting Mg‐10wt.%Ni (Mg10Ni) alloy is firstly modified by high‐energy ball milling (HEBM) and then surface catalysts expanded graphite (EG) or MoS2 or EG‐MoS2 are introduced to prepare Mg10Ni‐M (M = EG, MoS2, and EG‐MoS2) composites. The effects of surface catalysts on hydrolysis hydrogen generation of HEBM Mg10Ni alloy are comprehensively investigated. Their kinetics, rate‐limiting steps, and apparent activation energies are investigated by fitting the hydrolysis curves at different temperatures. The results indicate that the total hydrogen generation capacities of prepared Mg10Ni‐M (M = EG, MoS2, and EG‐MoS2) composites are 200, 170, 674, and 720 mL·g−1 within 1 minute at 291 K. The capacity and yield of Mg10Ni are 500 mL·g−1 and 56% within 15 minutes. The surface catalysts EG or MoS2 or EG‐MoS2 can distinctly elevate the initial H2 produce rate and promote the complete hydrolysis process. The highest capacity and generation yield within 15 minutes are 740.8 mL·g−1 and 91% obtained by HEBM Mg10Ni‐EG‐MoS2 composite at 291 K. The surface catalysis can promote high generation yield of Mg10Ni alloy in a short time.

Preparation and electrochemical hydrogen storage properties of Co 9 S 8 alloy coated with cobalt/graphene composite

“…A variety of materials, such as AB x ‐type, rare earth‐based, Ti‐based and Mg‐based alloys, nanocomposites etc. have been evaluated and proved to be effective anode materials for Ni‐MH batteries 3‐9 . Moreover, due to the high redox reaction activity, varied morphology and multiple valence states of cobalt atom, cobalt compounds have been studied as the promising electrodes for high‐performance energy storage device over the past years.…”

Comparative investigation on feasible hydrolysis H 2 production behavior of commercial Mg‐M (M = Ni, Ce, and La) binary alloys modified by high‐energy ball milling—Feasible modification strategy for Mg‐based hydrogen producing alloys

“…People have tried various strategies to regulate the H 2 production properties of Mg 39,55‐57 . In the past 10 decades, alloying, high‐energy ball milling and modifying the solution composition techniques are employed to accelerate the H 2 generation reaction of Mg by changing the activity and microstructure of matrix alloy, shorting the diffusion paths of medium and increasing the medium corrosivity 48,58‐60 .…”

Generation of hydrogen upon immersion of Mg in Mn(Ac) 2 and the reaction mechanism

“…Acceleration of metal‐water reactions is predominantly caused by the formation of a micro‐galvanic cell. Moreover, chlorides, especially NaCl or KCl solution, are a typical media used for metal corrosion due to pitting 26 . However, few reports focus on the evaluation of hydrogen generation and Mg corrosion in an acetate solution.…”

“…Moreover, chlorides, especially NaCl or KCl solution, are a typical media used for metal corrosion due to pitting. 26 However, few reports focus on the evaluation of hydrogen generation and Mg corrosion in an acetate solution. The generation of fresh metal and its participation in the further hydrogen generation have not been previously investigated.…”