Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 46, Issue 1, Pages 439-448Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2020.09.187
Keywords
Nitrogen fixation; B,O dual-doping; Carbon sphere; Non-metallic catalyst; Heteroatom
Categories
Funding
- Sichuan Science and Technology Program [2018JY0447]
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The study synthesized B, O-decorated carbon microspheres by a hydrothermal method, achieving high-efficiency metal-free electrocatalytic nitrogen reduction with outstanding ammonia production rate and stability selectivity.
Recently, electrochemical nitrogen reduction (NRR) has attracted significant interest due to its green synthesis process. However, the slow kinetics caused by the difficulty of N N bond activation and the competitive hydrogen evolution reaction hinder the development and application of electrochemical nitrogen reduction. Herein, we synthesized a metal-free electrocatalyst of B, O-decorated carbon microspheres (B,O-CMS) by a hydrothermal method using nitrogen-free raw materials. The doping of B increases the specific surface area, induces abundant microporous structure and adjusts the electronic structure of the materials. As a result, in 0.1 M HCl, B,O-CMS achieves a high V-NH3 of 19.2 mg h(-1) mg(-1) cat. and a high FE of 5.57% at -0.25 V vs. RHE, along with outstanding selectivity for NH3 production and stability. This work provides an effective approach to rationally design high-performance metal-free catalysts for NRR by doping heteroatoms into carbon materials. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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