TY - JOUR
T1 - Annealing enhancement in stability and performance of copper modified boron-doped diamond (Cu-BDD) electrode for electrochemical nitrate reduction
AU - Kuang, Peijing
AU - Natsui, Keisuke
AU - Einaga, Yasuaki
AU - Feng, Chuanping
AU - Cui, Yubo
AU - Zhang, Wanjun
AU - Deng, Yang
N1 - Funding Information:
The authors acknowledge the Inorganic Materials Chemistry Laboratory, Keio University (KU). This research was financed by the Science and Technology Innovation Foundation of Dalian, China ( 2018J12SN080 ), Natural Science Foundation (National Innovation Joint Fund) of Liaoning, China ( 2020-MZLH-02 ), Dalian Minzu University service national strategic special project, China ( 2020fwgj054 ) and ( 2020fwgj045 ). This research work was also supported by China Scholarship Council (CSC, No. 201706400005 ) during a visit of Peijing Kuang to KU.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/4
Y1 - 2021/4
N2 - Nitrate contamination in groundwater requires efficient remediation to prevent adverse environmental impacts. This study illustrates the improvement in nitrate reduction process using copper modified BDD (Cu-BDD) with higher stability after annealing treatment. The highest values for nitrate reduction and the selectivity of nitrogen gas were about 71% and 45%, respectively, which were obtained using annealed Cu-BDD electrode. Annealing process promoted the homogeneity of copper oxides that consolidated the electrodeposited copper oxides on the surface of Cu-BDD to enhance the stability of electrode. Meanwhile, annealed Cu-BDD exhibited higher conductivity to facilitate nitrate reduction initiating at a more positive potential. Furthermore, cuprous ions and metallic Cu were formed during the annealing treatment, and had active chemical reaction with nitrate and excellent catalytic capability for the reaction, which efficiently enhanced either the nitrate reduction efficiency or the selectivity of nitrogen gas. The findings advance the current understanding on the enhancement of electrochemical stability and nitrate reduction performance using Cu-BDD after the annealing treatment, and also offer a promising technology for remediation of nitrate-contaminated groundwater.
AB - Nitrate contamination in groundwater requires efficient remediation to prevent adverse environmental impacts. This study illustrates the improvement in nitrate reduction process using copper modified BDD (Cu-BDD) with higher stability after annealing treatment. The highest values for nitrate reduction and the selectivity of nitrogen gas were about 71% and 45%, respectively, which were obtained using annealed Cu-BDD electrode. Annealing process promoted the homogeneity of copper oxides that consolidated the electrodeposited copper oxides on the surface of Cu-BDD to enhance the stability of electrode. Meanwhile, annealed Cu-BDD exhibited higher conductivity to facilitate nitrate reduction initiating at a more positive potential. Furthermore, cuprous ions and metallic Cu were formed during the annealing treatment, and had active chemical reaction with nitrate and excellent catalytic capability for the reaction, which efficiently enhanced either the nitrate reduction efficiency or the selectivity of nitrogen gas. The findings advance the current understanding on the enhancement of electrochemical stability and nitrate reduction performance using Cu-BDD after the annealing treatment, and also offer a promising technology for remediation of nitrate-contaminated groundwater.
KW - Annealing treatment
KW - Copper modified boron doping diamond (Cu-BDD)
KW - Mechanism
KW - Nitrate reduction performance
KW - Stability
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U2 - 10.1016/j.diamond.2021.108310
DO - 10.1016/j.diamond.2021.108310
M3 - Article
AN - SCOPUS:85101763949
VL - 114
JO - Diamond and Related Materials
JF - Diamond and Related Materials
SN - 0925-9635
M1 - 108310
ER -