Heterogenous Cu@ZrO₂ nanofibers enable efficient electrocatalytic nitrate reduction to ammonia under ambient conditions

Abstract

In this work, we construct Cu@ZrO2 heterogenous structure as a new catalyst for nitrate reduction to ammonia and such catalyst achieves a large NH3 yield of 15.4 mg h-1 mg-1cat....

Copper-based electro-catalytic nitrate reduction to ammonia from water: Mechanism, preparation, and research directions

“…This improvement is attributed to the synergistic effect of TiO 2 /Cu 2 O/Cu and the steric limiting effect of the nanotube structure on the reaction intermediates. Other metal oxides have also been investigated for their synergistic interactions with Cu oxides [ [138] , [139] , [140] , [141] , [142] , [143] , [144] , [145] ], such as the Co-CuO x electrochemical filter composed of vertically aligned CuO x nanowalls embedded with CoO x nanoclusters [ 140 ]. This filter exhibited a N 2 selectivity of 96.0% and low energy consumption during NO 3 RR.…”

Fe(TCNQ)2 nanorod arrays: an efficient electrocatalyst for electrochemical ammonia synthesis via the nitrate reduction reaction

“…The eight electron transfer process associated electrochemical NO 3 − reduction reaction (NO 3 RR) to NH 3 is regarded as a promising means of converting NO 3 − without causing secondary contamination. 15,[27][28][29][30][31][32][33][34] Nevertheless, it is possible to mitigate the competitive hydrogen evolution reaction (HER) by designing a suitable electrocatalyst. Transition metal organic complexes, including cobalt phthalocyanine (CoPc), 35,36 copper phthalocyanine (CuPc), 10,37 and nickel phthalocyaninebased composites, 14,38,39 are regarded as promising electrocatalysts where the transition metal center is the active center of the electrochemical reduction reactions and organic ring phthalocyanine inhibits the competing HER.…”

Crystalline modulation of zirconia for efficient nitrate reduction to ammonia under ambient conditions

“…23 For the NITRR, Xia et al reported that Cu-loaded ZrO 2 nanofibers significantly inhibited the competitive hydrogen evolution reaction during nitrate reduction. 24 Mahmood et al reported that the energy barrier for the rate-determining hydrogenation step was reduced by doping Fe and Co into Pt/ZrO 2 . 25 Besides, the polycrystalline ZrO 2 can be readily regulated to meet various demands of catalytic reactions.…”

“…32 The fitted Zr 3d XPS spectrum has two peaks for Zr 3d 5/2 at 182.3 eV and Zr 3d 3/2 at 184.8 eV, verifying the existence of Zr 4+ . 24 The O 1s spectrum of t-ZSO is deconvoluted into three peaks including the peak at 530.1 eV related to the lattice oxygen, at 531.1 eV ascribed to the vacant oxygen and at 532.6 eV assigned to the absorbed oxygen. 9 Fig.…”