<p>Herein, a trinuclear coper(II) complex [Cu<sub>3</sub><sup>II</sup>(H<sub>2</sub>L<sup>1</sup>)<sub>2</sub>(HCOO)<sub>4</sub>], (<b>1</b>), stabilized by triethanolamine, H<sub>3</sub>L<sup>1</sup>, is isolated and characterized by various spectroscopic techniques and through single crystal X-ray structure. In the complex <b>1</b>, cooper(II) ions are in distorted octahedral coordination environment where two H<sub>3</sub>L<sup>1</sup> ligands and four formates are present to hold this tri-nuclear copper assembly. The complex <b>1</b> depicts as an efficient catalyst to produce ammonia (NH<sub>3</sub>) through electrocatalytic nitrate reduction (eNO<sub>3</sub>RR) in a 0.2&#xa0;M acetate buffer of pH 3, following a pseudo-first-order reaction kinetics producing 83% Faradaic Efficiency (FE%) of NH<sub>3</sub> at −0.3&#xa0;V vs. RHE with a yield rate of 21.56&#xa0;μmol&#xa0;h<sup>−1</sup>&#xa0;cm<sup>−2</sup> at −0.5&#xa0;V vs. RHE by suppressing the competitive HER.</p>

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Electrocatalytic nitrate reduction to ammonia by a triethanolamine Cu(II) complex

  • Swapnendu Dutta,
  • Dikshita Garg,
  • Subhasis Mondal,
  • Arindam Dey,
  • Ishita Mukherjee,
  • Arghyadip Bhowmik,
  • Madhubonti Pal,
  • Debobrata Sheet,
  • Biswarup Chakraborty,
  • Partha Halder

摘要

Herein, a trinuclear coper(II) complex [Cu3II(H2L1)2(HCOO)4], (1), stabilized by triethanolamine, H3L1, is isolated and characterized by various spectroscopic techniques and through single crystal X-ray structure. In the complex 1, cooper(II) ions are in distorted octahedral coordination environment where two H3L1 ligands and four formates are present to hold this tri-nuclear copper assembly. The complex 1 depicts as an efficient catalyst to produce ammonia (NH3) through electrocatalytic nitrate reduction (eNO3RR) in a 0.2 M acetate buffer of pH 3, following a pseudo-first-order reaction kinetics producing 83% Faradaic Efficiency (FE%) of NH3 at −0.3 V vs. RHE with a yield rate of 21.56 μmol h−1 cm−2 at −0.5 V vs. RHE by suppressing the competitive HER.