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Title: Patched bimetallic surfaces are active catalysts for ammonia decomposition

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms9619· OSTI ID:1239294
 [1];  [2]
  1. Univ. of Delaware, Newark, DE (United States); Beijing Institute of Technology, Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)
  2. Univ. of Delaware, Newark, DE (United States)

In this study, ammonia decomposition is often used as an archetypical reaction for predicting new catalytic materials and understanding the very reason of why some reactions are sensitive on material’s structure. Core–shell or surface-segregated bimetallic nanoparticles expose outstanding activity for many heterogeneously catalysed reactions but the reasons remain elusive owing to the difficulties in experimentally characterizing active sites. Here by performing multiscale simulations in ammonia decomposition on various nickel loadings on platinum (111), we show that the very high activity of core–shell structures requires patches of the guest metal to create and sustain dual active sites: nickel terraces catalyse N-H bond breaking and nickel edge sites drive atomic nitrogen association. The structure sensitivity on these active catalysts depends profoundly on reaction conditions due to kinetically competing relevant elementary reaction steps. We expose a remarkable difference in active sites between transient and steady-state studies and provide insights into optimal material design.

Research Organization:
Univ. of Delaware, Newark, DE (United States); Energy Frontier Research Centers (EFRC) (United States). Catalysis Center for Energy Innovation (CCEI)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-98CH10886; SC0001004
OSTI ID:
1239294
Journal Information:
Nature Communications, Vol. 6; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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Cited By (8)

Plasma‐Assisted ammonia decomposition over Fe–Ni alloy catalysts for CO x ‐Free hydrogen journal December 2018
Supported Rhodium Catalysts for Ammonia-Borane Hydrolysis: Dependence of the Catalytic Activity on the Highest Occupied State of the Single Rhodium Atoms journal March 2017
Functional MXene Materials: Progress of Their Applications journal August 2018
Optimization of the facet structure of transition-metal catalysts applied to the oxygen reduction reaction journal April 2019
Ni-based bimetallic heterogeneous catalysts for energy and environmental applications journal January 2016
Acceleration and sensitivity analysis of lattice kinetic Monte Carlo simulations using parallel processing and rate constant rescaling journal October 2017
Supported Rhodium Catalysts for Ammonia-Borane Hydrolysis: Dependence of the Catalytic Activity on the Highest Occupied State of the Single Rhodium Atoms journal March 2017
Effect of Pore Confinement of NaNH 2 and KNH 2 on Hydrogen Generation from Ammonia journal August 2019