1. Vanadium-doped Ni microspheres loaded with phosphatization of NiMoO4 contributing to enhanced electron transfer for stable overall water splitting.
- Author
-
Qin, Ruige, Chi, Linyuan, Han, Chengdong, Wang, Wenquan, Li, Yutong, Xie, Chenxu, Zhao, Lijun, Lang, Xingyou, and Jiang, Qing
- Subjects
- *
CHARGE exchange , *MICROSPHERES , *ACTIVATION energy , *PHOSPHATE coating , *CATALYTIC activity , *OXYGEN evolution reactions - Abstract
[Display omitted] • V-Ni@NiMoO 4 /Ni 12 P 5 with a microsphere structure as the supporting framework exhibits excellent cycling stability. • For OER, a low overpotential of only 254 mV is required to achieve a current density of 50 mA cm, with no significant decline observed after 114 h of cycling. • The introduction of phosphorus enhances the electron transfer at the Ni active sites, better activating adsorbates, and thus improving catalytic performance. At present, there are few reports on the micron-sized catalysts for overall water splitting. In this study, phosphating method were used to construct the self-supporting catalyst (V doped Ni microspheres coated by NiMoO 4 /Ni 12 P 5) with microspherical structure, providing a short path and a stable structure to guarantee quick electron transfer and excellent catalytic performance. Hence, oxygen evolution reaction (OER) only needs 254 mV to reach a current density of 50 mA cm−2 in 1.0 mol/L KOH, after 114 h without attenuation. The catalyst can achieve a current densitiy of 10 mA cm−2 with a voltage of only 158 mV for hydrogen evolution reaction (HER). When micron scale V-Ni@NiMoO 4 /Ni 12 P 5 is used as both anode and cathode for overall water splitting, the device can operate at a current density of 10 mA cm−2 for more than 200 h of good stability. Its superior catalytic performance can be attributed to the construction of micron size and phosphating. DFT calculations indicate that the introduction of P better activates the adsorbed *OH and H 2 O*, reduces reaction the energy barrier, and improves the catalytic activity. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF