期刊
NANO-MICRO LETTERS
卷 12, 期 1, 页码 -出版社
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-020-0400-z
关键词
MAB phase; N-2 reduction reaction; Electrocatalysis; Nanostructure
资金
- Australian Research Council (ARC) [DE150101306, LP160100927]
- Faculty of Science Strategic Investment Funding 2019 of University of Newcastle
- CSIRO Energy
- Australian Research Council [DE150101306] Funding Source: Australian Research Council
Achieving more meaningful N-2 conversion by reducing the energy input and carbon footprint is now being investigated through a method of N-2 fixation instead of the Haber-Bosch process. Unfortunately, the electrochemical N-2 reduction reaction (NRR) method as a rising approach currently still shows low selectivity (Faradaic efficiency < 10%) and high-energy consumption [applied potential at least - 0.2 V versus the reversible hydrogen electrode (RHE)]. Here, the role of molybdenum aluminum boride single crystals, belonging to a family of ternary transition metal aluminum borides known as MAB phases, is reported for the electrochemical NRR for the first time, at a low applied potential (- 0.05 V versus RHE) under ambient conditions and in alkaline media. Due to the unique nano-laminated crystal structure of the MAB phase, these inexpensive materials have been found to exhibit excellent electrocatalytic performances (NH3 yield: 9.2 mu g h(-1) cm(-2) mgcat.-1, Faradaic efficiency: 30.1%) at the low overpotential, and to display a high chemical stability and sustained catalytic performance. In conjunction, further mechanism studies indicate B and Al as main-group metals show a highly selective affinity to N-2 due to the strong interaction between the B 2p/Al 3p band and the N 2p orbitals, while Mo exhibits specific catalytic activity toward the subsequent reduction reaction. Overall, the MAB-phase catalyst under the synergy of the elements within ternary compound can suppress the hydrogen evolution reaction and achieve enhanced NRR performance. The significance of this work is to provide a promising candidate in the future synthesis of ammonia.
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