Journal
ACS NANO
Volume 12, Issue 12, Pages 12238-12246Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b06039
Keywords
transition metal phosphides; phosphorization; synthesis design; lithium-ion batteries; hydrogen evolution reaction
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Funding
- National Nature Science Foundation of China [21521092]
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Application of transition metal phosphides (TMPs) for electrochemical energy conversion and storage has great potential to alleviate the energy crisis. Although there are many methods to get TMPs, it is still immensely challenging to fabricate hierarchical porous TMPs with superior electrochemical performances by a simple, green, and secure approach. Herein, we report a facile method to synthesize the CoP/C nanoboxes by pyrolysis of phytic acid (PA) cross-linked Co complexes that are acquired from reaction of PA and ZIF-67. The PA can not only slowly etch ZIF-67 and gain a hollow structure but also act as a source of phosphorus to prepare CoP/C nanoboxes. The CoP/C nanoboxes deliver an ultrahigh specific capacity (868 mA h g(-1) at 100 mA g(-1)) and excellent cycle stability (523 mA h g(-1) after 1000 cycles at 500 mA h g(-1)) when used as anode materials for lithium-ion batteries. Moreover, when used as an electrocatalyst for hydrogen evolution reaction, the CoP/C nanoboxes exhibit ultralow overpotential, small Tafel slope, and excellent durability in acidic media. The method to produce CoP/C nanoboxes is easy and environmentally friendly and can be readily extended to design other TMPs/C nanocomposites.
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