Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 3, Pages 3372-3381Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b20184
Keywords
ZIF67; selenide reaction; carbon polyhedra; bifunctional electrocatalyst; overall water splitting
Funding
- Fundamental Research Funds for the Central Universities [2232016A3-02]
- National Natural Science Foundation of China [51433001, 21504012, 51773035]
- Program of Shanghai Subject Chief Scientist [17XD1400100]
- Science and Technology Commission of Shanghai Municipality [16520722100]
- Shanghai Rising-Star Program [18QA1400200]
- Natural Science Foundation of Shanghai [17ZR1439900]
- Shanghai Scientific and Technological Innovation Project [18JC1410600]
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Water electrolysis is a promising approach for green and large-scale hydrogen production; however, there are still challenges for developing efficient and stable bifunctional electrocatalysts toward the hydrogen and oxygen evolution reactions. Herein, zeolitic imidazolate framework-67 was used as the precursor for the construction of CoSe2 nanoparticles trapped in N-doped carbon (NC) polyhedra. Among as-obtained CoSe2-NC hybrid, highly active CoSe2 nanoparticles in sizes of 10-20 nm are encapsulated in N-doped few-layer carbon shell, avoiding their easy aggregations of CoSe2 nanoparticles as well as enhancing the long-term stability. The unique nanostructured CoSe2-NC hybrid with a hierarchical porosity and 3D conductive framework thus fully exerts outstanding bifunctional catalytic activity of CoSe2 centers. As a result, the CoSe2-NC hybrid as bifunctional catalysts for overall water splitting delivers a high current density of 50 mA cm(-2) with an applied voltage of similar to 1.73 V in an alkaline electrolyte, with a promising stability over 50 000 s.
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