Boosting nitrate-to-ammonia electrocatalysis through CoP-embedded phosphide doped carbon: Unrivaled efficiency and durability

Journal Article

Published in: https://www.sciencedirect.com/science/article/abs/pii/S0360319925062524

There are still not many meaningful alternatives to converting too-nitrogenated water into ammonia. This is mostly because it requires highly active and long-lasting catalysts. In this paper, we obtained a catalyst that meets these requirements by producing cobalt phosphide nanoparticles in a phosphorus-doped carbon matrix via an easy pyrolysis process. The composite was deposited onto carbon paper for the composite to better operate as an electrochemical material. A thorough structural and surface analysis confirmed that the CoP particles were embedded in the carbon matrix. This created a lot of reactive sites that made it easy for charges to move quickly through the material, which in turn created a lot of active sites that made it easy for charges to move quickly through the catalyst. As a result, the material produced ammonia at a rate of 0.5 mmol h-1 mgcat−1 and had a Faradaic efficiency of 86.18 % at −1.6 V vs. SCE. Computational research further indicated that the strong interaction between CoP and the doped carbon matrix makes it easier for important intermediates to stick to the surface, lowers the energy barrier for the rate-limiting phase, and effectively stops the competing hydrogen evolution pathway. These results suggest that the CoP-PC system is a strong and useful option for getting rid of nitrate pollution and making ammonia at the same time.