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A Nanoscale Ternary Amide‐rGO Composite with Boosted Kinetics for Reversible H 2 Storage

Journal Article · · Advanced Materials Interfaces
 [1];  [2];  [1];  [3];  [3];  [2];  [3];  [1]
  1. The Molecular Foundry Lawrence Berkeley National Laboratory Berkeley CA 94720 USA
  2. Lawrence Livermore National Laboratory 7000 East Avenue Livermore CA 94550 USA
  3. Sandia National Laboratories Livermore CA 94550 USA
Abstract

Metal amides are attractive candidates for hydrogen storage due to their high volumetric and gravimetric hydrogen densities. However, the sluggish kinetics and competing side reactions during hydrogen uptake and release limit their practical use. Here, a novel nanoconfined Li 2 Mg(NH) 2 @reduced graphene oxide (rGO) composite is presented, which is fabricated using a melt‐infiltration method with a minimum weight penalty of only 2 wt.%. The presence of rGO ensures close contact between the active phases, effectively preventing aggregation during cycling process. As a result, the reversible capacity of Li 2 Mg(NH) 2 @rGO reaches 4.42 wt.%, with no capacity degradation observed after multiple cycling. Theoretical calculations show that rGO catalyzes the hydrogen bond cleavage at the Mg‐amide/Li hydride interface, leading to local dehydrogenation hotspots and significantly improves kinetics of dehydrogenation compared to the bulk counterpart. This study provides a promising strategy for designing metal imide‐based composites to overcome the kinetic limitations and improve their reversible hydrogen storage performance.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231
OSTI ID:
1993336
Alternate ID(s):
OSTI ID: 2204946
OSTI ID: 2234046
OSTI ID: 1995594
Journal Information:
Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 27 Vol. 10; ISSN 2196-7350
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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