NiMoO4 nanorods with oxygen vacancies self-supported on Ni foam towards high-efficiency electrocatalytic conversion of nitrite to ammonia

Electroreduction of Nitrite to Ammonia over a Cobalt Single-Atom Catalyst

“…In addition, the excessive use of fertilizers in agricultural production and the discharge of industrial water result in a rapid accumulation of NO 2 – in the ecosystem, which is highly detrimental to public health and ecological equilibrium . Hence, NO 2 RR offers a feasible approach to attain sustainable NH 3 production while concurrently mitigating detrimental NO 2 – emissions. − However, the NO 2 RR process is impeded by the complicated NO 2 – → NH 3 process and competitive HER. To attain a high-efficiency NO 2 RR, the design of high-performance catalysts to promote the NO 2 RR while inhibiting the HER is highly desirable. − …”

An Amorphization-Engineered Catalyst for Electrocatalytic Reduction of Nitric Oxide to Ammonia

“…As depicted in Figure a, a-FeS 2 displays a notably higher LSV current density in NO-saturated solution with respect to Ar one, signifying the excellent reactivity of a-FeS 2 toward the NORR. Next, we quantitatively evaluate the NORR property of a-FeS 2 by combining chronoamperometry and colorimetric methods. − Figure b illustrates a distinctive volcano-like pattern in both NH 3 yield rate and FE NH3 , with the peak FE NH3 of 92.5% and corresponding NH 3 yield rate of 227.1 μmol h –1 cm –2 at −0.6 V. By comparing the performance of a-FeS 2 with catalysts previously reported (Figure c), it is apparent that a-FeS 2 stands out as one of the most efficient catalysts for the NORR. The pronounced reduction in NORR activity at −0.7 V is predominantly ascribed to the intensified competition from the HER .…”

Electrochemical reduction of nitrite to ammonia on amorphous MoO3 nanosheets

“…Diverse precious metals and non-precious metal-based compounds have been experimentally and theoretically explored for NO 2 RR, and their performances have been further improved by several strategies. 17–23 For instance, amorphization has been reported to be an efficient approach for effectively engineering the electronic structures of materials to enhance their catalytic properties. 24–27 Previous reports have demonstrated that amorphization can create abundant structural defects and dangling bonds on the catalyst surface, which can serve as active sites to accelerate ammonia electrosynthesis with high selectivity and activity, 27–29 rendering amorphous materials fascinating catalysts for efficient NO 2 RR.…”