journal article·2019-08-26

ZIF-67-Derived Cobalt/Nitrogen-Doped Carbon Composites for Efficient Electrocatalytic N2 Reduction

Yunnan Gao, Zishan Han, Song Hong, Tianbin Wu, Xin Li, Jieshan Qiu, Zhenyu Sun

ACS Applied Energy Materials· Volume 2· Issue 8
Publisher page

Abstract

Electrochemical N2 reduction (ENR) provides a potential approach for NH3 synthesis. To facilitate ENR, the development of naturally abundant, cheap, and effective electrocatalysts is critically important. Herein, we report Co/nitrogen-doped carbon composites comprising a large number of single Co sites for efficient N2 electrofixation at ambient conditions. The N configurations and Co species in the catalysts are readily tunable by controlling the calcination temperatures. Such low-cost catalysts enhanced electrochemical reduction of dinitrogen to ammonia, yielding a maximum ammonia production rate of about 5.1 μgNH3 h–1 mgcat.–1 at −0.4 V (vs. the reversible hydrogen electrode, RHE) and a Faradaic efficiency of up to 10.1% at −0.1 V (vs. RHE) in 0.1 M KOH electrolyte. We inferred that single Co atoms together with pyrrolic N may be major active sites for N2 activation. This work would provide an easy and alternative method for the synthesis of transition-metal catalysts for ENR.
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Research context

OpenAlex topics: Ammonia Synthesis and Nitrogen Reduction · Advanced Photocatalysis Techniques · Caching and Content Delivery

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Organic−Inorganic Composites, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China

College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China

Beijing National Laboratory for Molecular Sciences, Key Laboratory of Colloid and Interface and Thermodynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China

Beijing Key Laboratory of Energy Environmental Catalysis, Beijing University of Chemical Technology, Beijing 100029, P. R. China

Funding

State Key Laboratory of Organic-Inorganic Composites · Beijing National Laboratory for Molecular Sciences · State Key Laboratory of Separation Membranes and Membrane Processes · Beijing Natural Science Foundation

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