Preparation of UIO-66-based Porous Nano-octahedral FeP@PC for Efficient and Durable Hydrogen Evolution †

doi:10.7503/cjcu20190047

Abstract

Abstract:

By using UIO-66 as the precursor, porous FeP@PC was prepared by chemical vapor deposition of FeCl₃, in-situ carbonization, phosphating and HF etching. The morphology, crystal structure, elemental composition and valence states of FeP@PC were characterized by field emission transmission electron microscopy(FETEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and N₂ adsoption-desorption measurements. The results showed that FeP@PC maintained the original porous nano-octahedral structure of UIO-66 and had a high specific surface area of 83 m ²/g. For linear sweep voltammetry and electrochemical impedance spectroscopy measurements, the catalyst FeP@PC only needed overpotential of 156 mV to driven current density of 10 mA/cm ². Meanwhile, the Tafel slope, the electron-transfer resistance and the electrochemically active surface area of the catalyst were calculated to be 84 mV/dec, 44 Ω and 13.9 mF/cm ², respectively. In order to evaluate the durability and stability of the catalyst, 12 h-chronoamperometry and 1000-cycle cyclic voltammetry measurements were also conducted and no obvious activity decay was observed.

Key words: Iron phosphide, Metal-organic framework, Chemical vapor deposition(CVD), In situ phosphating, Hydrogen evolution reaction

CLC Number:

O646.51

TrendMD:

WANG Wenfeng, QIN Shan, ZHANG Rongrong, ZHOU Panpan, YANG Qinghua, CHEN Tianyun. Preparation of UIO-66-based Porous Nano-octahedral FeP@PC for Efficient and Durable Hydrogen Evolution ^†[J]. Chem. J. Chinese Universities, 2019, 40(9): 1979.

Figures/Tables 11

Fig.1 TEM(A) and SEM(B) images of UIO-66

Fig.2 XRD patterns(A) and TGA curve(B) of UIO-66

Fig.3 TEM images(A, B), SAED pattern(C) and HRTEM image(D) of FeP@PC (B) Local magnified image, the particles circled by red circles are FeP.

Fig.4 TEM image(A) and Fe(B), P(C), C(D) elemental mapping images of FeP@PC

Fig.5 EDS spectrum of FeP@PC

Fig.6 XRD patterns(A), Raman spectra(B), N2 adsorption-desorption isotherms(C) and BJH pore size distributions(D) of FeP@PC(a) and FeP@EC(b)

Fig.7 Survey(A), Fe2p(B), P2p(C) and C1s(D) XPS spectra of FeP@PC

Fig.8 LSV curves(A), three dimensional histograms(B), Tafel plots(C) and EIS(D) of different electrocatalysts Inset in (D) is the equivalent circuit used to fit the impedance spectra.

Fig.9 Electrochemical double-layer capacitance of FeP@EC and FeP@PC(A) and polarization curves of FeP@PC before and after 1000 CV sweeps(B) Inset in (B) was chronoamperometry curve.

Catalyst	Mass loading/ (mg·cm^-2)	η₀/mV	η₁₀/mV	Tafel slope/ (mV·dec^-1)	Ref.
FeP@PC	0.193	58	156	84.0	This work
Fe_xP@NPC	0.20		227	81.0	[7]
FeP SSs	0.57		66	45.0	[9]
HMFeP@C	0.72	25	115	56.0	[11]
MoP@PC	0.41	77	153	66.0	[15]
Ni₂P/C	0.20	98	189	113.2	[16]
Cu₃P@NPPC	0.29		89.0	76	[24]
Mo₂C	0.21		221	53.0	[25]
FeP NR	0.20	45	120	55.0	[26]
HNDCM-Co/CoP			135	64.0	[33]
Ni₅P₄-Ni₂P nanosheet	0.28	54	120.0	79.1	[34]
NiS nanoframe	1.00		94	115.0	[35]
Hydrogenated FeP	0.72		145	64.0	[36]
MoS₂			210	97.0	[37]
FeP/GA	0.32		150	65.0	[38]

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