Abstract
Water electrolysis is an emerging energy conversion technology, which is significant for efficient hydrogen (H2) 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 H2SO4 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 η10 = 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.
Highlights
Since the overall water splitting (OWS) process is different from the steam significant for efficient hydrogen (H2) production
The current findings indicate that the rational design of hierarchically bimetallic metal–organic frameworks (MOFs)-derived Co-based phosphide composite can be potentially applied in the practical OWS performance
The detailed synthetic method of the CoP-InNC@carbon nanotubes (CNTs) catalysts is well illustrated in Scheme 1
Summary
The detailed synthetic method of the CoP-InNC@CNT catalysts is well illustrated in Scheme 1. The analysis of PXRD pattern (Figure S20e, Supporting Information) demonstrates that the characteristic peaks of CoP after electrochemical OWS testing for 15 h are well preserved, indicating the good stability of the CoP-InNC@ CNT catalyst, which could be due to the CNT protection to avoid the CoP oxidation and/or decomposition. Thanks to the hierarchical MOF system, the special porous structure, high conductivity, fast electron transfer rate, and abundant active sites corresponding to the efficient synergetic interactions, the CoP-InNC@CNT microrod benefits the excellent electrocatalytic performance and long-term stability
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