WS2 is a promising non-noble metal electrocatalyst for hydrogen evolution.Experiments and theoretical calculations have proved that WS2 has good catalytic activity in acidic condition.However,its hydrogen evolution performance is poor in alkaline conditions,the high energy barrier of water dissociation is the key factor limiting its activity in basic hydrogen evolution.Doping is a commonly used effective method to regulate the energy barrier of water dissociation.Considering nitrogen has smaller atomic radius and stronger electronegativity,doping nonmetallic N in WS2 may be a relatively easy solution.X-ray crystal structure (XRD),scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) tests showed that N-doped WS2 (N-WS2) nanowire arrays was successfully synthesized.Compared to the WS2 nanowire arrays,the reaction rate under different temperatures and electrochemical impedance spectroscopy tests showed that N-WS2 nanowire arrays had significantly reduced energy barrier of water dissociation,the alkaline hydrogen evolution ctivity of N-WS2 nanowire arrays was greatly enhanced.In solution of 1mol/L KOH,it needed only 115mV to reach the current density of 10mA/cm2 and the Tafel slope was only 73 mV/dec,which was significantly better than the WS2 (292mV,137mV/dec) nanowire arrays.The design concept of adjusting the energy barrier of water dissociation by doping provided a possible and effective way for the rational design of basic electrocatalyst for hydrogen evolution.
Cao Maoqi, Sun Sailan, Long Chengmei, Luo Jun, Wu Dawang
. Preparation of N-doped WS2 nanowire arrays and its excellent electrocatalytic hydrogen evolution in alkaline[J]. New Chemical Materials, 2021
, 49(6)
: 117
-120
.
DOI: 10.19817/j.cnki.issn 1006-3536.2021.06.026
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