MIL-101(Fe)@Nb₂C MXene for efficient electrocatalytic ammonia production: an experimental and theoretical study

Abstract

The environment-friendly electrochemical nitrogen reduction reaction (NRR) is considered to be a promising alternative to the traditional Haber-Bosh process for ammonia production. However, the stability of nitrogen and competitive hydrogen...

Boosting Electrocatalytic N2 Reduction to NH3 by Enhancing N2 Activation via Interaction between Au Nanoparticles and MIL‐101(Fe) in Neutral Electrolytes

“…In xAu/MIL‐101(Fe) catalysts, the R ct values decrease first and then increase with the increase of Au NPs loadings, which further confirms that the possibility of particle agglomeration increases when the Au loadings increase, resulting in an increase in the R ct instead. Figure S15 shows that the current density of 15 %Au/MIL‐101(Fe) is enhanced compared with MIL‐101 (Fe), which makes up for the poor conductivity of MOF itself [60] . Notably, the comparison of the LSV curves in Figure S16 shows that the current density between different catalysts follows the trend of Au NPs>15 %Au/MIL‐101(Fe)>MIL‐101(Fe), which indicates that Au NPs has relatively strong HER ability.…”

“…Figure S15 shows that the current density of 15 %Au/MIL-101(Fe) is enhanced compared with MIL-101 (Fe), which makes up for the poor conductivity of MOF itself. [60] Notably, the comparison of the LSV curves in Figure S16 shows that the current density between different catalysts follows the trend of Au NPs > 15 %Au/MIL-101(Fe) > MIL-101(Fe), which indicates that Au NPs has relatively strong HER ability. However, MIL-101(Fe) can enrich the N 2 concentration on the surface of the catalyst.…”

Emerging MXene-based electrocatalysts for efficient nitrate reduction to ammonia: recent advance, challenges, and prospects

“…Due to the self-stacking of MXenes and the poor electrical conductivity of metal-organic frames (MOF), the heterostructure of MXenes and MOF provides an effective strategy for improving electrical conductivity, structural stability and active site utilization [59][60][61] . Wang et al synthesized 2D hybridization copper 1,4-benzenedi-carboxylate (CuBDC)@Ti 3 C 2 T x heterostructures through a primary growth strategy [Figure 8G] [62] . It can be seen from the thermogravimetric (TG) curve that CuBDC@Ti 3 C 2 T x has a lower -RR for 10% CuPc@MXene.…”

“…Reproduced with permission from Ref. [62] . Copyright 2022 American Association for the Advancement of Science.…”

“…Due to the strong interaction between MXene and other component materials, MXene-based heterostructure catalysts showed better cyclic stability (BP/Nb 2 C = 15 cycles and Fe 1 Cu 2 @Mxene = 14 cycles) than MXene-based SACs (FeSA/Mxene = 5 cycles) [68] . However, MXene-based heterostructure catalysts usually have high metal loading (> 10 wt%), which inevitably leads to waste of active sites and higher preparation costs [62] . Due to the high atom utilization and excellent intrinsic activity of MXene-based monatomic catalysts, FeSA/MXene exhibited an NH 3 selectivity of nearly 100% (99.2%) [75] , higher than that of MXene-based heterostructure catalysts (CuPc@Mxene = 94% and Fe 1 Cu 2 @Mxene = 95.6%) [58] .…”