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.
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).
Flashcards
Research intelligence for this paper
See its role on concept claims, tensions it is part of, placement history, and related discoveries.
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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