Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (4): 1131-1138.DOI: 10.1016/S1872-2067(21)63951-7
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Bo Zhou†, Mengyu Li†, Yingying Li†, Yanbo Liu, Yuxuan Lu, Wei Li, Yujie Wu, Jia Huo, Yanyong Wang*(), Li Tao#(
), Shuangyin Wang
Received:
2021-07-26
Accepted:
2021-07-26
Online:
2022-03-05
Published:
2022-03-01
Contact:
Yanyong Wang, Li Tao
About author:
First author contact:†Contributed equally to this work.
Supported by:
Bo Zhou, Mengyu Li, Yingying Li, Yanbo Liu, Yuxuan Lu, Wei Li, Yujie Wu, Jia Huo, Yanyong Wang, Li Tao, Shuangyin Wang. Cobalt-regulation-induced dual active sites in Ni2P for hydrazine electrooxidation[J]. Chinese Journal of Catalysis, 2022, 43(4): 1131-1138.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(21)63951-7
Fig. 1. Morphological and structural characterization of (Ni0.6Co0.4)2P electrode. (a) SEM image of (Ni0.6Co0.4)2P precursor; (b) SEM and TEM images of (Ni0.6Co0.4)2P; (c) XRD patterns of as synthesized (Ni0.6Co0.4)2P and Ni2P; High-resolution XPS spectra of Ni 2p (d), Co 2p (e) and P 2p (f).
Fig. 2. Electrocatalytic activity towards HzOR in 1.0 mol/L KOH/0.1 mol/L N2H4 electrolyte. (a) CV diagrams of Ni2P, (Ni0.6Co0.4)2P and Co2P in 1 mol/L KOH with 0.1 mol/L N2H4 with scan rate of 20 mV s-1; (b) Comparison of the overpotential of Ni2P, Co2P and (Ni0.6Co0.4)2P electrode at the j of 50 mA cm-2; (c) Calculated Tafel plots of Ni2P, (Ni0.6Co0.4)2P and Co2P electrode; (d) CV diagrams of (Ni0.6Co0.4)2P, (Ni0.6Co0.4)2P precursor, commercial Pt/C and bare GCE; (e) CV diagrams of Ni2P and (Ni0.6Co0.4)2P electrodes before and after stability test and the inset is the corresponding potentiostatic electrolysis curves; (f) The fitted Rct from the in situ EIS at Ni2P and (Ni0.6Co0.4)2P electrodes.
Fig. 3. Demonstration of energy releasing from hydrazine. Schematic diagram (a) and the polarization curves (c) of DHFCs with Pt/C cathode and (Ni0.6Co0.4)2P anode. GDL denotes as gas diffusion layer and AEM denotes as anion exchange membrane; Schematic diagram (b) and the polarization curves (d) of overall water splitting (black line) and hydrazine assisted water splitting (red line) in two-electrode system with Co2P cathode and (Ni0.6Co0.4)2P anode.
Fig. 4. DFT calculated profiles of free energy. (a) Optimized structure of hydrazine on (Ni0.6Co0.4)2P surface; (b) Density of states plots of (Ni0.6Co0.4)2P; (c) The most stable configurations of the adsorbed intermediates on the metal sites of (Ni0.6Co0.4)2P; (d) The free-energy profiles of HzOR on the (Ni0.6Co0.4)2P surface; (e?g) Top view of differential charge densities for Ni2P, Co2P and (Ni0.6Co0.4)2P with hydrazine, cyan region represents electron depletion and yellow region represents electron accumulation.
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