Open AccessStringing Bimetallic Metal–Organic Framework‐Derived Cobalt Phosphide Composite for High‐Efficiency Overall Water Splitting
Author(s) -
Chai Lulu,
Hu Zhuoyi,
Wang Xian,
Xu Yuwei,
Zhang Linjie,
Li TingTing,
Hu Yue,
Qian Jinjie,
Huang Shaoming
Publication year - 2020
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.201903195
Subject(s) - overpotential , materials science , oxygen evolution , water splitting , electrocatalyst , chemical engineering , hydrogen production , tafel equation , catalysis , electrochemistry , inorganic chemistry , nanotechnology , electrode , chemistry , biochemistry , photocatalysis , engineering
Abstract Water electrolysis is an emerging energy conversion technology, which is significant for efficient hydrogen (H 2 ) production. Based on the high‐activity transition metal ions and metal alloys of ultrastable bifunctional catalyst, the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are the key to achieving the energy conversion method by overall water splitting (OWS). This study reports that the Co‐based coordination polymer (ZIF‐67) anchoring on an indium–organic framework (InOF‐1) composite (InOF‐1@ZIF‐67) is treated followed by carbonization and phosphorization to successfully obtain CoP nanoparticles–embedded carbon nanotubes and nitrogen‐doped carbon materials (CoP‐InNC@CNT). As HER and OER electrocatalysts, it is demonstrated that CoP‐InNC@CNT simultaneously exhibit high HER performance (overpotential of 153 mV in 0.5 m H 2 SO 4 and 159 mV in 1.0 m KOH) and OER performance (overpotential of 270 mV in 1.0 m KOH) activities to reach the current density of 10 mA cm −2 . In addition, these CoP‐InNC@CNT rods, as a cathode and an anode, can display an excellent OWS performance with η 10 = 1.58 V and better stability, which shows the satisfying electrocatalyst for the OWS compared to control materials. This method ensures the tight and uniform growth of the fast nucleating and stable materials on substrate and can be further applied for practical electrochemical reactions.