Nano-Micro Letters

Bismuth-Based Free-Standing Electrodes for Ambient-Condition Ammonia Production in Neutral Media

Ying Sun1, 2, Zizhao Deng1, Xi-Ming Song3, Hui Li1, Zihang Huang1, Qin Zhao1, Daming Feng1, Wei Zhang3, Zhaoqing Liu4, Tianyi Ma2, *

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Nano-Micro Lett. (2020) 12: 133

First Online: 19 June 2020 (Article)

DOI:10.1007/s40820-020-00444-y

*Corresponding author. E-mail: Tianyi.Ma@newcastle.edu.au (Tianyi Ma)

 

Abstract

 


Toc

Electrocatalytic nitrogen reduction reaction is a carbon-free and energy-saving strategy for efficient synthesis of ammonia under ambient conditions, which is seriously hampered by the inefficient and expensive electrocatalysts. Here, we report the synthesis of nano-sized Bi2O3 particles grown on functionalized exfoliated graphene (Bi2O3/FEG) via a facile electrochemical deposition method. The obtained free-standing Bi2O3/FEG with a tunable Bi mass loading of 2.47 wt%, achieves a high Faradaic efficiency of 11.2% and a large NH3 yield of 4.21±0.14 μgNH3 h-1 cm-2 (i.e., 5.68 μgNH3 mgBi-1 h-1) at -0.5 V vs. reversible hydrogen electrode (RHE) in 0.1 M Na2SO4 electrolyte, even better than that in the strong acidic and basic media under the same ambient condition. Benefiting from its strong interaction of Bi 6p band with the N 2p orbitals, binder-free characteristic, and facile electron transfer process through the graphene nanosheets, Bi2O3/FEG achieves superior catalytic performance and excellent long-term stability as compared with most of the previous reported catalysts. This study is significant to design low-cost, high-efficient Bi-based electrocatalysts for electrochemical ammonia synthesis.


 

Keywords

N2 reduction, Bi2O3 nanoplate, Electrocatalysis, Free-standing

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