Electrocatalytic reduction of nitrate to ammonia on low-cost manganese-incorporated Co3O4 nanotubes

In Situ Construction of Metal–Organic Frameworks as Smart Channels for the Effective Electrocatalytic Reduction of Nitrate at Ultralow Concentrations to Ammonia

“…Tafel slopes derived from nitrate-to-ammonia conversion polarization curves (Figure S20) demonstrate the more kinetically favorable formation of adsorbed hydrogen (H ads ) (the Volmer reaction) and the subsequent protonation for *NO 3 − reduction to *NO 2 − over the catalyst/electrolyte surface for UiO-CuZn (105.8 mV dec −1 ). 64,65 In contrast, pristine UiO (315.5 mV dec −1 ), CuZn (332.6 mV dec −1 ), and UiO + CuZn (378.3 mV dec −1 ) electrodes show sluggish electron-transfer kinetics for ammonia production. 29,66 In addition, the enhancement of the intrinsic NO 3 RR catalytic performance of UiO-CuZn was further investigated by the turnover frequencies (TOFs) at each surface-active site (see the Experimental Section for the calculation in detail).…”

Electrocatalytic Synthesis of Nylon‐6 Precursor at Almost 100 % Yield

“…[13] There are two distinct pathways from *NO to NH 3 : (1) through the formation of *N; [14] (2) through the formation of *NH 2 OH. [15] The favorable pathway is determined by the properties of various electrocatalysts. Notably, coupling between *NH 2 OH and *CYC, instead of coupling between free NH 2 OH and free CYC, is the most likely pathway towards the formation of cyclohexanone oxime, due to the instability of free NH 2 OH in alkaline electrolytes (Figure S2).…”

“…The electrolysis was performed in 0.5 M K 2 CO 3 electrolyte (10 mL) with 1 M K 15 NO 3 and 0.1 M CYC. A molecular ion peak at 114, attributed to 15 Nmarked cyclohexanone oxime, indicates that the 15 N-marked cyclohexanone oxime originates from K 15 NO 3 (Figure 4d, and MS data of 14 N-marked cyclohexanone oxime is shown in Figure S13a). Therefore, the outstanding performance of the Fe electrocatalyst is due not only to the accumulation of *NH 2 OH and *CYC, but also to the prioritization of the CÀ N coupling step over the excessive reduction of key intermediates.…”

Co3O4nanoparticles embedded in porous carbon nanofibers enable efficient nitrate reduction to ammonia

“…16,17,[23][24][25] Among them, Co-based oxides have been demonstrated to be promising electrocatalysts for converting NO 3 À to NH 3 . [26][27][28][29][30][31][32] Here, we report The scanning electron microscope (SEM) image of Co@CNF presents a porous nanofibrous structure with an average diameter of about 300 nm (Fig. S1b, ESI †).…”

“…16,17,23–25 Among them, Co-based oxides have been demonstrated to be promising electrocatalysts for converting NO 3 − to NH 3 . 26–32 Here, we report Co 3 O 4 nanoparticle-decorated porous carbon nanofibers (Co 3 O 4 @CNF) as a superb NITRR electrocatalyst for NH 3 synthesis. Combination of Co 3 O 4 with CNF is beneficial to disperse Co 3 O 4 and enhance the conductivity.…”