Bifunctional Cu-Sn Oxides for Electrocatalytic Upgrade of Nitrate and Glucose to Ammonium Formate
Zhenjun Liu1,2, Yi Shen1,2
1School of Food Science and Engineering, South China University of Technology, Guangzhou, China.
Abstract:
A paired electrochemical system for cathodic electrocatalytic nitrate reduction reaction (NO3 -RR) and anodic glucose oxidation reaction (GOR) offers a green approach to the sustainable production of high-value-added ammonium formate. Herein, bifunctional Cu-Sn oxide catalysts supported on nickel foam were synthesized via a simple one-step soaking method for NO3 -RR and GOR. The optimized catalyst achieves a high NH3 yield rate of 26.57 mg h-1 cm-2 with a Faradaic efficiency (FE) of 85.3% at -0.4 V vs. RHE for NO3 -RR, along with excellent stability. As for GOR, a remarkable formate production rate of 44.88 mg h-1 cm-2 and a FE of 81.8% are achieved at 1.55 V vs. RHE. Encouraged by the outstanding performance, we constructed a NO3 -RR||GOR electrolyzer, using nitrate and glucose-containing wastes as feedstocks, yielding 6.13 g of ammonium formate after a 4-h electrolysis at 1.8 V. A comprehensive techno-economic analysis demonstrated that this coupled system is potentially profitable and commercially viable, with projected profits of approximately $700.50 for the co-production of 1 tonne of ammonium formate and 5.59 tonnes of K2SO4. This work provides a feasible strategy to design coupling systems for the electrocatalytic valorization of renewable biomass.
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