Ultrathin porous CoP nanosheets drive HER
Phosphidation of Co3O4 yields sub-1.1 nm porous CoP sheets with exposed {200} facets and high HER mass activity.
Source
Sub-1.1 nm ultrathin porous CoP nanosheets with dominant reactive {200} facets: a high mass activity and efficient electrocatalyst for the hydrogen evolution reaction
Study at a glance
- Design
- Other — Ultrathin porous CoP nanosheets for acidic HER with DFT H-adsorption analysis
- N
- Electrocatalysis materials study — no sample N
- Population
- CoP ultrathin porous nanosheet electrodes in 0.5 M H2SO4
- Outcome
- HER overpotential, Tafel slope, and mass activity
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
Ultrathin porous CoP nanosheets drive HER
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
56 and 131 mV give 10 and 100 mA cm–2; Tafel slope is 44 mV/decade.
The products exhibit outstanding performance for HER: low potential (only 56 and 131 mV are required for current densities of 10 and 100 mA cm –2 , respectively), small Tafel slope (44 mV per decade), high mass activity (151 A g –1 at an overpotential of 100 mV), nearly 100% faradic efficiency and good stability (at least 20 h).
Mass activity is 151 A g–1 at 100 mV overpotential.
Our theoretical calculations and experimental results demonstrate that CoP UPNSs are highly efficient catalysts for HER with a huge mass activity of 151 A g –1 at an overpotential of 100 mV.
What they did
Authors converted Co3O4 to CoP ultrathin porous nanosheets, measured HER in 0.5 M H2SO4, extracted capacitance/ECSA, and computed H adsorption on CoP(100).
What they found
56 and 131 mV reach 10 and 100 mA cm–2; Tafel slope 44 mV dec–1; mass activity 151 A g–1 at 100 mV; ~100% Faradaic efficiency and 20 h stability. P-terminated (200) is preferred.
The limits
What it doesn't show
Device-scale alkaline or seawater HER is untested; ECSA uses an assumed 40 μF cm–2 specific capacitance.
Key terms
- HER
- Hydrogen evolution reaction: 2H+ + 2e– → H2.
- Tafel slope
- mV per decade of current; encodes the rate-determining electron-transfer steps.
- Mass activity
- Current per gram of catalyst at a stated overpotential.
- {200} facet
- Preferentially exposed CoP plane; P-termination is computed more stable.
- Faradaic efficiency
- Fraction of charge that produces the intended product (here H2).
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Quiz yourself
CoP UPNSs are made by:
Common questions
How are CoP UPNSs made?
Low-temperature phosphidation of Co3O4 with NaH2PO2.
What overpotential gives 10 mA cm–2?
56 mV.
What is the mass activity at 100 mV?
151 A g–1.
Which termination is more stable?
P-terminated CoP(200)/ (100).
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