Electrochemical reduction of CO₂to HCOOH on a synthesized Sn electrocatalyst using a Co₃O₄anode

Abstract

The present work investigates the electrocatalytic effect of tin (Sn) and cobalt oxide (Co 3 O 4 ) towards reduction of CO 2 to products electrochemically (RCPE). Electrocatalyst (Sn) powder was synthesized by electrodeposition method from SnCl 2 . 2H 2 O solution. Experiments were conducted using Co 3 O 4 and Sn electrodes as anode and cathode, respectively, in 0.5M carbonates and bicarbonates of potassium and sodium solutions. Electrodes were prepared by coating electrocatalysts on graphite plate surface. The experiments were conducted at different applied voltages (1.5 to 3.5 V) and time intervals (5, 10, 15, 20 and 25 min) at various electrolyte solutions. It was observed that HCOOH acid was the only product formed for all the applied conditions. At 1.5 V and 2 V, maximum Faradaic efficiencies of 74.04 % and 92.6 % for HCOOH were obtained at 20 and 5 min reaction in KHCO 3 electrolyte solution. The ability of Co 3 O 4 for water oxidation and Sn electrocatalyst towards reduction of CO 2 to HCOOH was established from the obtained results. Optimized reaction conditions to get high Faradaic efficiencies were explained in detail. 8 was found in the range of 156.7 -278.9 nm. The distribution median size (D v50 ) of Sn electrocatalyst particle was found to be 192.5 nm. Figure 3. Characterization of Sn electrocatalyst (a) FTIR, (b) XRD, and (c) particle size analysis

Sn nanoparticles on gas diffusion electrodes: Synthesis, characterization and use for continuous CO 2 electroreduction to formate

“…Several metals have been used as electrocatalysts for CO2 electrochemical reduction to formic acid/formate, such as Pb [25,26], In [27], Ir [24], Cu [28], Pd [29,30], Co [31] or, specially, Sn [32][33][34][35][36][37][38][39][40][41][42]. These metals are usually deposited in form of particles to maximize the active surface with the minimum amount of metal, and recent studies show that the structure and size of these particles have a great influence on the selectivity and behaviour of the electrochemical reduction [32][33][34].…”

Electrochemical Reduction of CO2: A Review of Cobalt Based Catalysts for Carbon Dioxide Conversion to Fuels

“…The bimetallic cobalt oxide with other metals has also been explored for ECO 2 RR. The tin (Sn) and cobalt oxide (Co 3 O 4 ) electrocatalytic effect for reduction of CO 2 was investigated by Yadav and Purkait [ 136 ]. The process was performed by using Sn and Co 3 O 4 as cathode and anode, respectively, in 0.5 M KHCO 3 and NaHCO 3 electrolyte solutions at various applied voltages ranges and times.…”

Continuous Semi-Micro Reactor Prototype for the Electrochemical Reduction of CO2into Formic Acid

“…21,28−32 On the other hand, tetraethylammonium perchlorate/propylene carbonate 5 solution, KOH− methanol 33,34 36 The better solubility of CO 2 enhances the CO 2 reduction process, which ultimately helps to get higher FE for CO 2 reduction. 20,21,37 The FE depends not only on the electrolytes and the electrodes but also on different types of reactors. So designing a proper reactor is quite essential for achieving maximum FE and efficient conversion of CO 2 .…”