Journal
NANO-MICRO LETTERS
Volume 12, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-020-00486-2
Keywords
Electrocatalysis; Cobalt phosphide; Hydrogen purification; Ammonia oxidation reaction; Membrane-free architecture
Funding
- National Natural Science Foundation of China [51708543, 51438011, 51722811]
- Water Pollution Control and Treatment National Science and Technology Major Project [2017ZX07402001, 2018ZX07110-007]
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Electrochemical reduction of water to hydrogen (H-2) offers a promising strategy for production of clean energy, but the design and optimization of electrochemical apparatus present challenges in terms of H(2)recovery and energy consumption. Using cobalt phosphide nanoarrays (Co2P/CoP NAs) as a charge mediator, we effectively separated the H(2)and O(2)evolution of alkaline water electrolysis in time, thereby achieving a membrane-free pathway for H(2)purification. The hierarchical array structure and synergistic optimization of the electronic configuration of metallic Co2P and metalloid CoP make the Co2P/CoP NAs high-efficiency bifunctional electrocatalysts for both charge storage and hydrogen evolution. Theoretical investigations revealed that the introduction of Co2P into CoP leads to a moderate hydrogen adsorption free energy and low water dissociation barrier, which are beneficial for boosting HER activity. Meanwhile, Co2P/CoP NAs with high capacitance could maintain a cathodic H(2)evolution time of 1500 s at 10 mA cm(-2)driven by a low average voltage of 1.38 V. Alternatively, the energy stored in the mediator could be exhausted via coupling with the anodic oxidation of ammonia, whereby only 0.21 V was required to hold the current for 1188 s. This membrane-free architecture demonstrates the potential for developing hydrogen purification technology at low cost.
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