Core-Shell ZIF-8@ZIF-67-Derived CoP Nanoparticle-Embedded N-Doped Carbon Nanotube Hollow Polyhedron for Efficient Overall Water Splitting.
Yuan PanKaian SunShoujie LiuXing CaoKonglin WuWeng-Chon CheongZheng ChenYu WangYang LiYunqi LiuDingsheng WangQing PengChen ChenYadong LiPublished in: Journal of the American Chemical Society (2018)
The construction of highly active and stable non-noble-metal electrocatalysts for hydrogen and oxygen evolution reactions is a major challenge for overall water splitting. Herein, we report a novel hybrid nanostructure with CoP nanoparticles (NPs) embedded in a N-doped carbon nanotube hollow polyhedron (NCNHP) through a pyrolysis-oxidation-phosphidation strategy derived from core-shell ZIF-8@ZIF-67. Benefiting from the synergistic effects between highly active CoP NPs and NCNHP, the CoP/NCNHP hybrid exhibited outstanding bifunctional electrocatalytic performances. When the CoP/NCNHP was employed as both the anode and cathode for overall water splitting, a potential as low as 1.64 V was needed to achieve the current density of 10 mA·cm-2, and it still exhibited superior activity after continuously working for 36 h with nearly negligible decay in potential. Density functional theory calculations indicated that the electron transfer from NCNHP to CoP could increase the electronic states of the Co d-orbital around the Fermi level, which could increase the binding strength with H and therefore improve the electrocatalytic performance. The strong stability is attributed to high oxidation resistance of the CoP surface protected by the NCNHP.
Keyphrases
- carbon nanotubes
- density functional theory
- metal organic framework
- electron transfer
- reduced graphene oxide
- molecular dynamics
- highly efficient
- quantum dots
- hydrogen peroxide
- human health
- molecularly imprinted
- high resolution
- cancer therapy
- mass spectrometry
- gold nanoparticles
- molecular dynamics simulations
- climate change
- risk assessment
- ion batteries
- transcription factor
- sewage sludge