Details

Autor(en) / Beteiligte

• Pan, Yuan
• Sun, Kaian
• Liu, Shoujie
• Cao, Xing
• Wu, Konglin
• Cheong, Weng-Chon
• Chen, Zheng
• Wang, Yu
• Li, Yang
• Liu, Yunqi
• Wang, Dingsheng
• Peng, Qing
• Chen, Chen
• Li, Yadong

Titel

Core–Shell ZIF-8@ZIF-67-Derived CoP Nanoparticle-Embedded N‑Doped Carbon Nanotube Hollow Polyhedron for Efficient Overall Water Splitting

Ist Teil von

• Journal of the American Chemical Society, 2018-02, Vol.140 (7), p.2610-2618

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.