Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (8): 1287-1296.DOI: 10.1016/S1872-2067(20)63740-8
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Chengying Guoa, Yanmei Shia, Siyu Luc, Yifu Yua,*(), Bin Zhanga,b,#(
)
Received:
2020-09-11
Accepted:
2020-09-11
Online:
2021-08-18
Published:
2020-12-10
Contact:
Yifu Yu,Bin Zhang
About author:
# +86-22-27406140; Fax: +86-22-27403475; E-mail: bzhang@tju.edu.cnSupported by:
Chengying Guo, Yanmei Shi, Siyu Lu, Yifu Yu, Bin Zhang. Amorphous nanomaterials in electrocatalytic water splitting[J]. Chinese Journal of Catalysis, 2021, 42(8): 1287-1296.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63740-8
Fig. 1. (a) Scheme of processes associated with an aerosol-spray assisted method for the synthesis of amorphous nanomaterials. Reproduced with permission from [33]. Copyright 2014, Wiley-VCH. (b) Illustration of the two-step hydrothermal synthesis of amorphous FeMoS4 NRA/CC. Reproduced with permission from [37]. Copyright 2017, Royal Society of Chemistry.
Fig. 2. HRTEM images (left) and FFTs (right) of surface regions in LiCoO2 (a-c) and LiCoPO4 (d-f): (a) pristine LiCoO2, (b) cycled in 0.1M KPi, (c) cycled in 0.1 M KOH, (d) pristine LiCoPO4, (e) cycled in 0.1 M KPi, and (f) cycled in 0.1M KOH. Reproduced with permission from [38]. Copyright 2012, American Chemical Society. (g) Scheme of in situ formed amorphous layer through leaching Y3+ in Y2Ir2O7. Reproduced with permission from [42]. Copyright 2017, American Chemical Society. (h) HRTEM image of Ni2P nanoparticles after electrochemical OER measurement for 1 h; inset: FFT of the dotted yellow area. EDX mapping of P (i), O (j), and Ni (k), and combined (l) elemental mapping. Reproduced with permission from [43]. Copyright 2015, Royal Society of Chemistry.
Fig. 3. Scheme of transformation from crystalline Pd3P2S8 into amorphous Li-PPS NDs and their electrocatalytic performance. Reproduced with permission from [49]. Copyright 2018, Nature Publishing Group.
Fig. 4. (a) XRD patterns of amorphous Co/Fe-based (oxy)hydroxide. A-C and A-F indexed to Co-based (oxy)hydroxide and Fe-based (oxy)hydroxide. The Co/Fe ratio of CFOH-COH-1/3, CFOH-COH-1, and CFOH-COH-3 are 1:3, 1:1, and 1:1, respectively. Reproduced with permission from [50]. Copyright 2020, Elsevier. (b) XRD of un-anodized and anodized materials followed by annealing at different temperatures. Reproduced with permission from [51]. Copyright 2016, Royal Society of Chemistry. (c) XRD of amorphous and crystalline Ni-Fe alloy. Reproduced with permission from [52]. Copyright 2020, American Chemical Society. (d) HRTEM image of crystalline CoFe2O4. (e) The corresponding SAED of (d). (f) HRTEM image of amorphous CoFe2On (n = ~3.66). (g) The corresponding SAED of (f). Reproduced with permission from [26]. Copyright 2014, American Chemical Society. (h) HRTEM image and SAED of amorphous Li-PPS NDs. Reproduced with permission from [49]. Copyright 2018, Nature Publishing Group. (i) HRTEM and SAED of amorphous Fe-Ni alloy. HAADF-STEM images of amorphous Fe-Ni alloy (j) and crystalline Fe-Ni alloy (k). Reproduced with permission from [52]. Copyright 2020, American Chemical Society.
Fig. 5. (a) Raman spectra of crystalline and disord cobalt manganese oxides. Reproduced with permission from [54]. Copyright 2013, Wiley-VCH. (b) Raman spectra of (1) Co3O4-20 h, (2) Co3O4-20 h-H2O2, and (3) Co3O4-20 h-H2O2-Ar, and the crystalline degree decreased from (1) to (3). Reproduced with permission from [56]. Copyright 2014, Wiley-VCH. (c) The XANES spectra of Co K-edge for pakhomovskyite loaded on FTO electrode, after operation at 1.35 V for 2 min and 10 h. Reproduced with permission from [57]. Copyright 2015, Wiley-VCH. (d) The k3-weighted FT spectra of NiSe/NiO, NiSe2 ultrathin nanowires (NiSe2 UNWs), NiO, and NiSe. Reproduced with permission from [58]. Copyright 2017, Wiley-VCH. (e) XANES profiles of Co3O4 under electrochemical conditions. Reproduced with permission from [28]. Copyright 2015, Nature Publishing Group. (f) Co K-edge FT-EXAFS k3χ data of SnCoFe and SnCoFe-Ar. Reproduced with permission from [60]. Copyright 2018, Wiley-VCH.
Fig. 6. (a) OER on the surface of a crystal; (b) OER catalysis in the bulk of amorphous material, and proton transfer to an electrolyte buffer base at the surface; (c) Catalytic currents for variation of the deposition charge from 2 to 200 mC. (d) TOF per cobalt ion and the formed O2 molecule. Reproduced with permission from [72]. Copyright 2014, Wiley-VCH.
Fig. 7. Electrochemical measurement and projected density of states (PDOS) of Ni-Fe Prussian blue analogues. (a) Chronopotentiometric measurement at a current density of 20 mA cm-2; (b) Polarization curves for different cycles and IrO2; (c) Multi-step deprotonation during OER; PDOS of Ni(OH)2 (d), NiOOH1.5 (e), and NiOOH0.5 (f). Reproduced with permission from [73]. Copyright 2018, American Chemical Society.
Fig. 8. (a) Chronopotentiometric curves of Ni foam, amorphous, and crystalline Ni-Fe alloy loaded Ni foam at a constant current density (500 mA cm-2) at 80 °C. Reproduced with permission from [52]. Copyright 2020, American Chemical Society. HRTEM image of pristine Co4N (b) without activation, and after 20 (c), 100 (d), 500 (e), and 1000 (f) CV cycles. Reproduced with permission from [89]. Copyright 2015, Wiley-VCH.
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