Abstract
The electrocatalytic hydrogen evolution reaction (HER) for the preparation of hydrogen fuel is a very promising technology to solve the shortage of hydrogen storage. However, in practical applications, HER catalysts with excellent performance and moderate price are very rare. Molybdenum carbide (MoxC) has attracted extensive attention due to its electronic structure and natural abundance. Here, a comprehensive review of the preparation and performance control of hierarchical porous molybdenum carbide (HP-MoxC) based catalysts is summarized. The methods for preparing hierarchical porous materials and the regulation of their HER performance are mainly described. Briefly, the HP-MoxC based catalysts were prepared by template method, morphology-conserved transformations method, and secondary conversion method of an organic-inorganic hybrid material. The intrinsic HER kinetics are enhanced by the introduction of a carbon-based support, heteroatom doping, and the construction of a heterostructure. Finally, the future development of HP-MoxC based catalysts is prospected in this review.
Highlights
Hydrogen is a green energy with high energy density and excellent combustion performance (Martinez et al, 2019; Yang et al, 2019)
This review focuses on the preparation and performance of HP-MoxC based catalysts, including soft-hard template method, morphology-conserved transformations, secondary conversion of organic-inorganic hybrid materials to construct catalysts with specific morphology
This study provides an effective strategy for the synthesis of a MoxC@C catalyst
Summary
Hydrogen is a green energy with high energy density and excellent combustion performance (Martinez et al, 2019; Yang et al, 2019). Hierarchical Porous Molybdenum Carbide a d-band structure similar to Pt (Zhao et al, 2019b) This makes MoxC a promising alternative to precious metal catalysts. HP-MoxC based catalysts with a special morphology have many excellent properties such as rapid mass transfer, ultra-high surface area, controlled pore size and nano-effects (Niu et al, 2019; Wang et al, 2019b).
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