Carbon-coated nickel nanoparticles that make CO from CO2

N-doped carbon plus a carbon coat lets metallic Ni nanoparticles reach about 94% CO faradaic efficiency, suppressing hydrogen evolution.

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How do the authors keep Ni from just making H2?

Carbon coating plus an N-doped carbon support suppress HER and boost CO2-to-CO.

What peak CO faradaic efficiency is reported?

Approximately 94% at −0.7 V vs RHE.

What current density is quoted at −1.1 V?

22.7 mA cm−2.

Are these Ni single-atom catalysts?

No: HAADF-STEM shows 10–100 nm nanoparticles; the Ni–N XPS peak is absent.

What Ni 2p binding energy dominates?

~853.8 eV, assigned to metallic Ni0.

What Ni loadings were measured by ICP?

~3.6 wt% (ATPA@C) and ~4.0 wt% (TPA@C).

Which N 1s components are deconvoluted?

Pyridinic ~398.6, pyrrolic ~400.7, graphitic ~401.6, oxidic ~403.5 eV.

Was a typical N–Ni single-atom XPS peak seen?

No: the ~399.6 eV N–Ni peak was not observed.

How can catalytic properties be tuned?

Organic linker type and addition of carbon black.

How does this metallic Ni compare to prior Ni catalysts?

Superior to previous metallic Ni and comparable to the best Ni single-atom catalysts.

What cell setup was used for CO2RR tests?

A gas-tight three-electrode configuration.