Fig. 2: Single-cell performance of the Ag-NP catalyst. | Nature Communications

Fig. 2: Single-cell performance of the Ag-NP catalyst.

From: Extrinsic hydrophobicity-controlled silver nanoparticles as efficient and stable catalysts for CO2 electrolysis

Fig. 2: Single-cell performance of the Ag-NP catalyst.

a Selectivity of CO and (b) CO partial current density versus applied cell voltage in a zero-gap CO2 electrolyzer for the Ag black and Ag-NP catalysts. Ag black catalyst is a commercial fine powder of metallic Ag. Each experiment was measured three times to obtain the average value and error. b, c Durability test results for the Ag-NP catalyst in the zero-gap CO2 electrolyzer at (b) 150 mA cm‒2 for 100 h and (c) 3.4 V for 50 h. d Durability test results for the Ag black catalyst in the zero-gap CO2 electrolyzer at 3.4 V for 15 h. Selectivity of CO and H2 measured during the durability tests. The electrodes of the CO2 electrolyzer were prepared with 0.3 mg cm‒2 of Ag catalysts on a 10-cm2 gas diffusion layer (GDL) on the cathode side. e–g Low-magnification TEM image of the (e) Ag-NP, (f) Ag black, (g) and Ag-PTFE catalysts after the durability test at 3.4 V. h Schematics (low and high magnifications) of the triple phase boundary for the hydrophilic Ag black and hydrophobic Ag-NP catalysts in the CO2 electrolyzer.

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