Anomalous metastable hcp Ni nanocatalyst induced by non-metal N doping enables promoted ammonia borane dehydrogenation  

作　　者：Ping Li Yuqi Huang Quhua Huang Ran Chen Jixin Li Shuanghong Tian 

机构地区：[1]School of Environmental Science and Engineering,Sun Yat-sen University,Guangzhou 510275,Guangdong,China [2]Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology,Guangzhou 510275,Guangdong,China

出　　处：《Journal of Energy Chemistry》2023年第4期72-82,共11页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China (52002412 and 22072186);the Natural Science Foundation of Guangdong Province (2021A1515010575);the Guangzhou Science and Technology Plan General Project (202102020862)。

摘　　要：Developing high-performing non-noble transition metal catalysts for H_(2) evolution from chemical hydrogen storage materials is of great significance for the hydrogen economy system, yet challenging. Herein,we present for the first time that anomalous metastable hexagonal close-packed Ni nanoparticles induced by heteroatom N doping encapsulated in carbon(N-hcp-Ni/C) can exhibit admirable catalytic performance for ammonia borane(AB) dehydrogenation, prominently outperforming conventional fcc Ni counterpart with similar morphology and favorably presenting the state-of-the-art level.Comprehensive experimental and theoretical studies unravel that unusual hcp phase engineering of Ni together with N doping could induce charge redistribution and modulate electronic structure, thereby facilitating H_(2)O adsorption and expediting H_(2)O dissociation(rate-determining step). As a result, AB dehydrogenation can be substantially boosted with the assistance of N-hcp-Ni/C. Our proposed strategy highlights that unconventional crystal phase engineering coupled with non-metal heteroatom doping is a promising avenue to construct advanced transition metal catalysts for future renewable energy technologies.

关 键 词：Hcp Ni Non-metal doping Phase engineering Electronic regulation Ammonia borane dehydrogenation 

分 类 号：TQ116.2[化学工程—无机化工] TQ426