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.
Source
Carbon-supported Ni nanoparticles for efficient CO<sub>2</sub> electroreduction
Study at a glance
- Design
- Other — Pyrolyzed carbon-supported Ni nanoparticles for aqueous CO2-to-CO electrolysis with DFT
- N
- Electrocatalysis materials study — no sample N
- Population
- Ni nanoparticle catalysts on N-doped carbon supports
- Outcome
- CO faradaic efficiency and current density in CO2 electroreduction
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Inspect source passages
Carbon-coated nickel nanoparticles that make CO from CO2
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
CO faradaic efficiency reaches approximately 94% at −0.7 V vs RHE.
This metallic Ni catalyst affords a high CO FE of up to approximately 94% (at –0.7 V vs. RHE) and a current density of 22.7 mA cm –2 (at –1.1 V), making it superior to all previous metallic Ni catalysts and even comparable to the best single Ni atom catalysts reported to date.
Ni content is ~3.6 wt% in Ni-NC_ATPA@C and ~4.0 wt% in Ni-NC_TPA@C.
The content of Ni in the catalysts was determined by inductively coupled plasma-atomic emission spectrometry (ICP-AES); it was ∼3.6 wt% in Ni-NC_ATPA@C and ∼4.0 wt% in Ni-NC_TPA@C.
What they did
Authors pyrolyzed Ni with organic linkers and carbon black, characterized Ni loading (~3.6–4.0 wt%), XPS (Ni0, no Ni–N single-atom peak), HAADF-STEM (10–100 nm particles), and measured aqueous CO2-to-CO electrolysis plus DFT.
What they found
CO FE up to ~94% at −0.7 V vs RHE and 22.7 mA cm−2 at −1.1 V. Carbon coating plus N-doped support suppress HER. XPS/STEM argue metallic nanoparticles, not Ni single atoms or nitride.
The limits
What it doesn't show
Long-term industrial MEA stacks and C2+ products are not claimed; performance is compared to prior Ni catalysts, not a full techno-economic plant.
Key terms
- Faradaic efficiency (FE)
- Fraction of current that produces CO rather than H2.
- HER suppression
- Carbon coat/N-support that make H2 evolution less competitive.
- Ni0 nanoparticles
- Metallic nickel particles 10–100 nm, not isolated Ni–N4 sites.
- N-doped carbon
- Support with pyridinic/pyrrolic/graphitic nitrogen.
- CO2-to-CO
- Two-electron electroreduction to carbon monoxide.
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Peak CO FE is about:
Common questions
Best CO FE?
About 94% at −0.7 V vs RHE.
Current density cited?
22.7 mA cm−2 at −1.1 V.
Single atoms?
No: STEM 10–100 nm particles; no Ni–N XPS peak.
Ni loading?
~3.6–4.0 wt%.
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