Inhibition of hydrogen evolution without debilitating electrochemical CO₂ reduction via the local suppression of proton concentration and blocking of step-edges by pyridine functionalization on Cu electrocatalysts

Abstract

Electrochemical carbon dioxide reduction reaction (CO2RR) to chemicals can store renewable electricity and simultaneously control global warming. Albeit inexpensive copper electro-catalyzing CO2 to hydrocarbons at reasonable rates, it suffers from...

Can the CO2 Reduction Reaction Be Improved on Cu: Selectivity and Intrinsic Activity of Functionalized Cu Surfaces

“…Plot of j C 2 H 4 as a function of applied potential E , calculated with respect to geometric surface area (top, a) and ECSA (bottom, b). Data were obtained from [A] Kuhl et al; [B] Hori et al; [C] Hori et al; [D] Ummireddi et al; [E] Xie et al; [F] Wei et al; [G–I] Takeuchi et al; [J] Liang et al; [K] Ahn et al; [L] Tao et al; [M, N] Buckley et al; [O] Pankhurst et al; [P] Zhong et al; and [Q] Zhong et al Any “missing letters” in the legend are due to the study not reporting the property in the figure, cf. Table S1.…”

Homogenizing Zn Deposition in Hierarchical Nanoporous Cu for a High‐Current, High Areal‐Capacity Zn Flow Battery

“…The double layer capacitance ( C dl ) can be attained via $${C}_{{\rm{dl}}} = \frac{{{{\Delta}}j}}{v}\ $$, where Δ j is the average of the magnitudes of the currents in the forward and backward scans, and v is the scan rate. This study refers to specific capacitances ( C s ) of smooth surface for carbon 20 µF cm −2 and for Cu 43.1 µF cm −2 , [ 55,56 ] and ECSA is then C dl /C s . All experiments were carried out at room temperature (≈22 °C).…”

“…The doublelayer capacitances of the Cu foam, NPCu foam and graphite felt are 0.34, 7.4, 8.0 mF cm −2 , respectively. Assuming the specific capacitances of planar Cu and graphite to be 20.0 and 43.1 μF cm −2 respectively, [55,56] we calculate the ECSA values to be 7.9, 171.7, and 400 cm 2 for the Cu foam, the NPCu foam and the GF, respectively. The ECSA of NPCu foam is over 20 times higher than the pristine Cu foam, consistent with the roughness differences observed under SEM (Figure S7A,B, Supporting Information).…”

Toward Unifying the Mechanistic Concepts in Electrochemical CO2 Reduction from an Integrated Material Design and Catalytic Perspective

“…[148] In the case of molecular catalysts, such mechanistic pathways are triggered by the potential induced oxidation state variation of the metal centers or the ligands. [149][150][151] For example, in post-transition metalloporphyrins of Rh, Sn, and In, the formate or formic acid production has been predicted to proceed through an anionic hydride as the key intermediate [152,153] with a nucleophilic attack on CO 2 carbon, producing the HCOO¯ species.…”