Journal
SMALL
Volume 14, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201802824
Keywords
all pH values; DFT calculations; hydrogen evolution reaction; ice-templating; ultrathin CoP nanosheet aerogel
Categories
Funding
- National Natural Science Foundation of China [21501105, 51473081, 51672143]
- Taishan Scholars Program and Outstanding Youth of Natural Science in Shandong Province [JQ201713]
Ask authors/readers for more resources
Transition metal phosphides (TMPs) are certified high performance electrocatalysts for the hydrogen evolution reaction (HER). The ultrathin 2D structure of TMPs can offer abundant adsorption sites to boost HER performance. Herein, an ice-templating strategy is developed to prepare CoP aerogels composed of 2D ultrathin CoP nanosheets (<1.5 nm) using sustainable alginate biomass (seaweed extract) as the precursor. The highly porous aerogel structure can not only deliver facile mass transfer, but also prevent aggregation of the nanosheets into layered structures. As expected, the obtained CoP nanosheet aerogels exhibit remarkable stability and excellent electrocatalytic HER performance at all pH values. For instance, the sample CoP-400 presents a low overpotential of 113, 154, and 161 mV versus RHE at a current density of 10 mA cm(-2) in 0.5 M H2SO4, 1 M KOH, and 1 M phosphate buffer solution, respectively. In addition, CoP-400 displays low Tafel slopes at all pH values due to the interconnected highly porous structure of the aerogel, indicating that the sample can provide low-resistance channels for mass transport. Density functional theory calculations reveal that P-top and Co bridge on (011) facet of CoP are more favorable sites during the process of HER in acid and alkaline solutions, respectively.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available