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Electrodeposited NiCu bimetal on carbon paper as stable non-noble anode for efficient electrooxidation of ammonia

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Irvine_2017_ACBE_Electrodeposited_CCBY.pdf (2.821Mb)
Date
05/12/2018
Author
Xu, Wei
Du, Dongwei
Lan, Rong
Humphreys, John
Miller, David N.
Walker, Marc
Wu, Zucheng
Irvine, John T. S.
Tao, Shanwen
Funder
EPSRC
EPSRC
EPSRC
Grant ID
EP/G01244X/1
ep/l017008/1
EP/K031252/1
Keywords
Ammonia
Electrooxiation
Anode
Wastewater
Ni-Cu bimetal
QD Chemistry
NDAS
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Abstract
Electrochemical remediation of ammonia-containing wastewater at low cell voltage is an energy-effective technology which can simultaneously recover energy via hydrogen evolution reaction. One of the main challenges is to identify a robust, highly active and inexpensive anode for ammonia electrooxidation. Here we present an alternative anode, prepared by electrochemical co-deposition of Ni and Cu onto carbon paper. This NiCu bimetallic catalyst is characterised by scanning electron microscope, scanning transmission electron microscope, X-ray diffraction, x-ray photoelelectron spectroscopy, cyclic voltammetry, linear sweep voltammetry and chronoamperometry techniques. The stability and activity of NiCu bimetallic catalyst are largely improved in comparison with Ni or Cu catalyst. Moreover this noble-metal-free NiCu catalyst even performs better than Pt/C catalyst, as NiCu is not poisoned by ammonia. An ammonia electrolysis cell is fabricated with NiCu/carbon paper as anode for ammonia electrolysis. The influences of pH value, applied cell voltages and initial ammonia concentration on cell current density, ammonia removal and energy efficiency are tested. An ammonia removal efficiency of ∼80% and coulombic efficiency up to ∼92% have been achieved. Ni-Cu bimetal on carbon paper is a stable non-noble anode for efficient electrooxidation of ammonia.
Citation
Xu , W , Du , D , Lan , R , Humphreys , J , Miller , D N , Walker , M , Wu , Z , Irvine , J T S & Tao , S 2018 , ' Electrodeposited NiCu bimetal on carbon paper as stable non-noble anode for efficient electrooxidation of ammonia ' , Applied Catalysis B: Environmental , vol. 237 , pp. 1101-1109 . https://doi.org/10.1016/j.apcatb.2016.11.003
Publication
Applied Catalysis B: Environmental
Status
Peer reviewed
DOI
https://doi.org/10.1016/j.apcatb.2016.11.003
ISSN
0926-3373
Type
Journal article
Rights
© 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Description
The authors thank EPSRC for funding (Grant No. EP/G01244X/1 and EP/L017008/1). One of the authors (Xu) gratefully acknowledges the China Scholarship Council (CSC) for financial support.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/11457

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