Recent Advances in the Application of Structural‐Phase Engineering Strategies in Electrochemical Nitrogen Reduction Reaction

Abstract

Figure 1. Reaction mechanisms of the nitrogen reduction reaction. Reproduced with permission. [7] Copyright 2019, Royal Society of Chemistry.

Synergistic Enhancement of Electrocatalytic Nitrogen Reduction Over Boron Nitride Quantum Dots Decorated Nb2CTx‐MXene

“…[3][4][5][6][7][8][9] However, the efficiency of the NRR process is largely limited by the large overpotential for N 2 activation due to strong nonpolar NN bond and poor Faradaic efficiency (FE) due to undesired competing H 2 evolution reaction (HER). [10][11][12][13][14][15] To tackle these limitations, tremendous efforts have been made to develop www.advancedsciencenews.com © 2021 Wiley-VCH GmbH www.small-journal.com…”

“…[3][4][5][6][7][8][9] However, the efficiency of the NRR process is largely limited by the large overpotential for N 2 activation due to strong nonpolar NN bond and poor Faradaic efficiency (FE) due to undesired competing H 2 evolution reaction (HER). [10][11][12][13][14][15] To tackle these limitations, tremendous efforts have been made to develop The BNQDs@Nb 2 CT x were prepared by a facile self-assembly method. As illustrated in Figure 1, the accordion-like Nb 2 CT x nanosheets (Figure S1, Supporting Information) were exfoliated from the parent Nb 2 AlC by selective etching Al layers in a HF solution, [55] while the BNQDs were prepared by cutting of BN nanosheets (Figure S2, Supporting Information) based on a solvothermal approach.…”

“…First, the controlled spectrophotometric tests confirm that the NH 3 generation can only be detected in N 2 electroreduction (Figure S14, Supporting Information). In addition, the isotope-labeling 1 H nuclear magnetic resonance (NMR, Figure 4e) experiments for NRR measurements show characteristic doublet and triplet peaks when using 15 N 2 and 14 N 2 as the feeding gases, respectively, whereas no peak is present upon using Ar as feed gas. We also use the 15 N 2 -labeling NMR technique to quantitatively determine the NH 3 yield of BNQDs@Nb 2 CT x , [35] which is found to be in good agreement with that based on the UV-vis test (Figure S15, Supporting Information).…”

“…In addition, the isotope-labeling 1 H nuclear magnetic resonance (NMR, Figure 4e) experiments for NRR measurements show characteristic doublet and triplet peaks when using 15 N 2 and 14 N 2 as the feeding gases, respectively, whereas no peak is present upon using Ar as feed gas. We also use the 15 N 2 -labeling NMR technique to quantitatively determine the NH 3 yield of BNQDs@Nb 2 CT x , [35] which is found to be in good agreement with that based on the UV-vis test (Figure S15, Supporting Information). Further, as shown in Figure 4f, the alternating NRR cycling test conducted between N 2 and Ar-saturated electrolyte shows that the NH 3 yield rate is remarkable and stable in each cycle of N 2 -saturated electrolyte, while the blank results can be found in each cycle of Ar-saturated electrolyte.…”

Direct In Situ Vertical Growth of Interlaced Mesoporous NiO Nanosheets on Carbon Felt for Electrocatalytic Ammonia Synthesis

“…Electroactive materials used in e-NRR mainly include noble metal nanoparticles, [8,9] single atoms, [10,11] transition metal oxides, [12][13][14][15] and metallic carbides/sulfides. [16,17] Among these materials, transition metal oxides, in particular nickel oxide, is one of the most promising NRR electroactive materials due to the tunable 3d electronic structure, relatively high natural abundance, and good safety. However, the poor intrinsic conductivity of NiO greatly hinders further improvements in its ammonia production performance.…”