Iron phosphide encapsulated in P-doped graphitic carbon as efficient and stable electrocatalyst for hydrogen and oxygen evolution reactionsElectronic supplementary information (ESI) available. See DOI: 10.1039/c8nr06752j
The development of durable and efficient non-noble electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is highly desirable but challenging for the commercialization of renewable energy systems. Herein, a facile strategy is developed for the synthesis of iro...
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Main Authors | , , , , , , , , , |
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Format | Journal Article |
Published |
22.11.2018
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Online Access | Get full text |
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Summary: | The development of durable and efficient non-noble electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is highly desirable but challenging for the commercialization of renewable energy systems. Herein, a facile strategy is developed for the synthesis of iron phosphide (FeP) nanoparticles protected with an overcoat of "multifunctional" P-doped graphitic carbon as a cost-effective electrocatalyst. The key point is the utilization of MOF-derived iron nanoparticles embedded in graphitic carbon (Fe@GC), which are synthesized
via
the pyrolysis of the Fe-MIL-88 template and subsequent phosphorization of Fe and simultaneous doping of P in carbon. Compared to the direct phosphorization of Fe-MIL-88, resulting in Fe
2
P on amorphous carbon (Fe
2
P@APC), this strategy gives easier access to phosphorization and P doping through pyrolysis temperature regulation. High-temperature pyrolysis can also yield the graphitic carbon encapsulated nanoparticle structure (FeP@GPC), which increases conductivity and prevents agglomeration as well as dissolution under harsh operating conditions, and thus contributes to enhanced activity and long-time stability. The optimized FeP@GPC exhibits superior activity compared to Fe
2
P/FeP@GPC and Fe
2
P@APC, which is attributed to the modified electronic structure of FeP due to its greater P proportion than Fe
2
P together with the strong synergy between the nanoparticles and graphitic carbon. In detail, FeP@GPC exhibits an ultralow overpotential of 72 mV and 278 mV to achieve the current density of 10 mA cm
−2
for the HER in acid and OER in alkaline media, respectively, together with negligible degradation after 20 h, which ranks among the best Fe-based electrocatalysts.
FeP encapsulated in P-doped graphitic carbon, which is fabricated
via
the pyrolysis of Fe-MIL-88 followed by phosphorization, exhibits excellent HER and OER activity. |
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Bibliography: | 10.1039/c8nr06752j Electronic supplementary information (ESI) available. See DOI |
ISSN: | 2040-3364 2040-3372 |
DOI: | 10.1039/c8nr06752j |