Journal
NANO ENERGY
Volume 82, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105732
Keywords
Hydrogen evolution reaction; Titanium oxide; Cobalt carbonate hydroxide; Surface reconstruction; Volmer
Categories
Funding
- National Natural Science Foundation of China [51772214, 51432006, 51701170]
- Ministry of Science and Technology of China [2011DFG52970]
- Ministry of Education of China [IRT14R23]
- 111 Project [B13025]
- Jiangsu Province [2011-XCL-019, 2013479]
- Innovation Program of Shanghai Municipal Education Commission
- Outstanding Youth Foundation of Hebei Province [E2019201277]
- Project of Science and Technology of Fujian Province [2018J01520]
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The in-situ surface reconstruction on a composite between cobalt carbonate hydroxide and titanium oxide can facilitate the Volmer step, resulting in a highly efficient electrocatalyst for alkaline hydrogen evolution reaction (HER). Experimental characterization and density functional theory calculation reveal that the activated composite exhibits excellent electrocatalytic performance in alkaline media.
The sluggish water dissociation (Volmer step) is a rate-limiting step slowing down alkaline hydrogen evolution reaction (HER), and therefore hinders the efficient industrial production of clean hydrogen resource. In this work, we report that the Volmer step can be facilitated by in-situ surface reconstruction on a composite between cobalt carbonate hydroxide and titanium oxide (TiO2@CoCH), and the resultant activated structure turns to be a highly efficient electrocatalyst for alkaline HER. Experimental characterization and density functional theory calculation evidence that under HER potential the smooth TiO2@CoCH surface is roughened and Co interstitial defects in TiO2 are formed, which are energetically favorable for Volmer step. The activated composite exhibits an overpotential of 99 ? 6 mV for a current density of 20 mA cm-2 and 187 ? 21 mV for 100 mA cm-2, suggesting that TiO2@CoCH is one of promising non-precious metal electrocatalysts for HER in alkaline media.
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