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Surface Engineering of Porphyrin Coordination on a Carbon Nanotube for Efficient Hydrogen Evolution
Author(s) -
Wang Lidong,
Zhang Zhaosheng,
Li Meng,
Li Qiuhan,
Wang Bo,
Wang Shuwen,
Zhou Huang,
Mao Boyang
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202000104
Subject(s) - porphyrin , overpotential , catalysis , tafel equation , bimetallic strip , carbon nanotube , electrocatalyst , materials science , platinum , chemical engineering , nanotechnology , inorganic chemistry , chemistry , photochemistry , organic chemistry , electrode , electrochemistry , engineering
Functionalised porphyrins have attracted considerable attention owing to their ability to coordinate with numerous metal ions. We design and synthesize a novel composite system based on functionalised Pt(II)‐porphyrin and multiwalled carbon nanotubes for hydrogen evolution reaction (HER) electrocatalysis. Rather than qualitatively integrating porphyrin with carbon nanotubes, the optimized Pt(II)‐porphyrin loading and precisely morphology control could be fine‐tuned and quantitatively premeditated by using fluorescence and UV‐vis titration based on the unique π–π interactions behaviour of the porphyrin for the first time. The as‐prepared composites exhibit superior HER catalytic activity with an overpotential of 35 mV for an electrocatalytic current density of j=−10 mA cm −2 and a Tafel slope of 32.3 mV dec −1 . Moreover, such catalysts do not exhibit observable activity decay after a 1000‐cycle stability test, thus demonstrating their excellent durability. To further reduce Pt loading to achieve cost efficiency, we develop a Pt−Co bimetallic HER catalyst with an ultra‐low platinum content through a straightforward synthesis pathway with high catalytic activity and stability. This study provides a new approach for preparing a highly active and stable HER catalyst, which could potentially be extended to other reactions to improve the utilization efficiency of precious metal catalysts.