Ultrathin Co 0.5 NiS Nanosheets for Hydrazine Oxidation Assisted Nitrite Reduction
Abstract Nitrite (NO 2 − ) and hydrazine (N 2 H 4 ) are common N‐pollutants in groundwater. The electrochemical method can realize the treatment of N‐pollutants and the synthesis of energy substance ammonia (NH 3 ). Designing and synthesizing efficient electrocatalysts is of great significance. Here...
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Published in | Advanced functional materials Vol. 34; no. 8 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.02.2024
|
Online Access | Get full text |
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Summary: | Abstract
Nitrite (NO
2
−
) and hydrazine (N
2
H
4
) are common N‐pollutants in groundwater. The electrochemical method can realize the treatment of N‐pollutants and the synthesis of energy substance ammonia (NH
3
). Designing and synthesizing efficient electrocatalysts is of great significance. Herein, ultrathin Co
0.5
NiS nanosheets attached on nickel foam (Co
0.5
NiS‐NSs/NF) are synthesized via cyanogel‐NaBH
4
hydrolysis process and succedent sulfurization approach. Owing to the ultrathin nanosheet structure and the interaction between Ni and Co, Co
0.5
NiS‐NSs/NF exhibits high activity for NO
2
−
reduction reaction (NO
2
−
RR), in which the Faraday efficiency is 92.2% and the NH
3
yield is 0.25 mmol h
−1
cm
−2
at −0.15 V potential. Meanwhile, Co
0.5
NiS‐NSs/NF also displays remarkable activity for N
2
H
4
oxidation reaction in KOH electrolyte. Therefore, a symmetrical Co
0.5
NiS‐NSs/NF||Co
0.5
NiS‐NSs/NF electrolyzer is assembled, which only needs the operating voltage of 0.36 V to reach 10 mA cm
−2
for NO
2
−
‐to‐NH
3
conversion in the presence of N
2
H
4
. This work reports a promising and efficient strategy for NH
3
production at a small operating voltage and treatment of the N‐pollutants. |
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ISSN: | 1616-301X 1616-3028 |
DOI: | 10.1002/adfm.202310288 |