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

Electrocatalytic nitrogen reduction reaction is a carbon-free and energy-saving strategy for efficient synthesis of ammonia under ambient conditions. Here, we report the synthesis of nanosized Bi 2 O 3 particles grown on functionalized exfoliated graphene (Bi 2 O 3 /FEG) via a facile electrochemical deposition method. The obtained free-standing Bi 2 O 3 /FEG achieves a high Faradaic efficiency of 11.2% and a large NH 3 yield of 4.21 ± 0.14 $$ \upmu{\text{g}}_{{{\text{NH}}_{3} }} $$ μ g NH 3 h −1 cm −2 at − 0.5 V versus reversible hydrogen electrode in 0.1 M Na 2 SO 4 , better than that in the strong acidic and basic media. Benefiting from its strong interaction of Bi 6 p band with the N 2 p orbitals, binder-free characteristic, and facile electron transfer, Bi 2 O 3 /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.

Abstract licence: CC BY

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