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S-Doped three-dimensional graphene (S-3DG): a metal-free electrocatalyst for the electrochemical synthesis of ammonia under ambient conditions

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Abstract

In this study, we report sulfur-doped three-dimensional graphene (S-3DG) as a metal-free electrocatalyst for N2 reduction reaction (NRR) under ambient conditions. Due to the high electron transport capacity and stable physicochemical properties of 3DG, it was utilized to improve the NRR catalytic performance dramatically. Hence, in 0.05 M H2SO4 the S-3DG achieved a remarkably large NH3 yield of 38.81 μgNH3 mgcat−1 h−1 and a high faradaic efficiency of 7.72% at −0.6 V versus a reversible hydrogen electrode (RHE), which is superior to most non-metal catalysts. Notably, it shows such outstanding selectivity that no hydrazine by-products were detected and the electrochemical stability passed a long-term durability test.

Graphical abstract: S-Doped three-dimensional graphene (S-3DG): a metal-free electrocatalyst for the electrochemical synthesis of ammonia under ambient conditions

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Article information


Submitted
20 Dec 2019
Accepted
17 Jan 2020
First published
18 Jan 2020

Dalton Trans., 2020, Advance Article
Article type
Paper

S-Doped three-dimensional graphene (S-3DG): a metal-free electrocatalyst for the electrochemical synthesis of ammonia under ambient conditions

J. Wang, S. Wang and J. Li, Dalton Trans., 2020, Advance Article , DOI: 10.1039/C9DT04827H

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