Electrochemistry Application — Partial selenium surface modulation of metal organic framework assisted cobalt sulfide hollow spheres for high performance bifunctional oxygen electrocatalysis and rechargeable zinc-air batteries

3 measurement groups · 56 results

Reported values remain attached to the sample, method, conditions, extraction quality and source location that produced them.

OER LSV, Tafel, EIS, double-layer capacitance and chronoamperometric/cyclic stability

Impedance spectroscopy Voltammetry Tafel and polarisation analysis Chronoamperometry

Se-doped MOF CoS2 hollow spheres on carbon cloth · Electrode

1.0 M KOH, three-electrode setup, room temperature, Ag/AgCl reference calibrated to RHE, Pt foil counter, LSV 5 mV s-1, CV stability 50 mV s-1, EIS 0.01 Hz to 100 kHz.

Temperature: room temperature
Atmosphere: alkaline electrolyte
Geometry: carbon cloth working electrode, catalyst loading ca. 0.5 mg cm-2
Context: target compared with MOF CoS2, MOF CoSe, MOF Co, bare CC and IrO2 controls
Measurement source: 3 and 7 (render p003 and p007) · 2.5 Electrochemical measurements; 3.2 · Fig. 5

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
OER double-layer capacitance for bare carbon cloth	0.125 mF cm-2	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5E
OER double-layer capacitance for MOF Co control	3.96 mF cm-2	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5E
OER double-layer capacitance for MOF CoS2 control	7.36 mF cm-2	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5E
OER double-layer capacitance for MOF CoSe control	6.012 mF cm-2	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5E
OER double-layer capacitance for Se-doped MOF CoS2Marked as a best value within this paper	11.89 mF cm-2	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5E
OER overpotential at 10 mA cm-2 for bare carbon cloth	630 mV	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5A
OER overpotential at 10 mA cm-2 for IrO2 benchmarkMarked as a best value within this paper	270 mV	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5A
OER overpotential at 10 mA cm-2 for MOF Co control	370 mV	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5A
OER overpotential at 10 mA cm-2 for MOF CoS2 control	310 mV	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5A
OER overpotential at 10 mA cm-2 for MOF CoSe control	320 mV	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5A
OER overpotential at 10 mA cm-2 for Se-doped MOF CoS2Marked as a best value within this paper	290 mV	—	—	Text Exact Reported	6-7 (render p006-p007) · 3.2 · Fig. 5A
OER charge-transfer resistance for MOF Co control	8.625 ohm	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5D
OER charge-transfer resistance for MOF CoS2 control	1.279 ohm	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5D
OER charge-transfer resistance for MOF CoSe control	4.592 ohm	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5D
OER charge-transfer resistance for Se-doped MOF CoS2Marked as a best value within this paper	1.044 ohm	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5D
OER polarisation stability after cycling	nearly not altered after 10,000 cycles	—	—	Text Qualitative	7 (render p007) · 3.2 · Fig. 5F inset
OER chronoamperometric current stability duration	current density kept virtually consistent throughout 50 h	—	—	Text Qualitative	7 (render p007) · 3.2 · Fig. 5F
OER Tafel slope for bare carbon cloth	179.3 mV dec-1	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5B
OER Tafel slope for IrO2 benchmark	47.5 mV dec-1	—	—	Figure Axis Approximate	7 (render p007) · 3.2 · Fig. 5B
OER Tafel slope for MOF Co control	105.2 mV dec-1	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5B
OER Tafel slope for MOF CoS2 control	71.7 mV dec-1	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5B
OER Tafel slope for MOF CoSe control	86.9 mV dec-1	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5B
OER Tafel slope for Se-doped MOF CoS2Marked as a best value within this paper	50.8 mV dec-1	—	—	Text Exact Reported	7 (render p007) · 3.2 · Fig. 5B

ORR CV, LSV, RDE, Tafel, Koutecky-Levich, cycling stability and chronoamperometry

Voltammetry Tafel and polarisation analysis Chronoamperometry

Se-doped MOF CoS2 hollow spheres on RDE · Electrode

0.1 M KOH, O2- or N2-saturated, RDE 100-2500 rpm, LSV 5 mV s-1, 1600 rpm durability and methanol tolerance tests.

Temperature: ambient temperature
Atmosphere: O2 saturated or N2 saturated as specified
Geometry: 5 mm RDE, 0.19625 cm2
Context: target compared with MOF CoS2, MOF CoSe, MOF Co, bare GC and Pt/C
Measurement source: 3 and 8 (render p003 and p008) · 2.5.1; 3.3 · Fig. 6; Fig. S8-S10 referenced

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
ORR half-wave/current profile shift after cycling	negative change in just 10 mV after 25,000 cycles	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6E
ORR half-wave potential for bare glassy carbon	0.58 V	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6A
ORR half-wave potential for MOF Co control	0.620 V vs RHE	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6A
ORR half-wave potential for MOF CoS2 control	0.678 V vs RHE	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6A
ORR half-wave potential for MOF CoSe control	0.647 V vs RHE	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6A
ORR half-wave potential for Se-doped MOF CoS2Marked as a best value within this paper	0.88 V vs RHE	—	—	Text Exact Reported	7-8 (render p007-p008) · 3.3 · Fig. 6A
ORR pathway from Koutecky-Levich analysis	four-electron process	—	—	Text Qualitative	8 (render p008) · 3.3 · Fig. 6D
ORR limiting current density for bare glassy carbon	0.008 mA cm-2	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6A
ORR limiting current density for MOF Co control	1.7 mA cm-2	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6A
ORR limiting current density for MOF CoS2 control	4.03 mA cm-2	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6A
ORR limiting current density for MOF CoSe control	4.8 mA cm-2	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6A
ORR limiting current density for Se-doped MOF CoS2Marked as a best value within this paper	5.6 mA cm-2	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6A
ORR chronoamperometric current retentionMarked as a best value within this paper	more than 90% after 500,000 s at 0.65 V vs RHE	—	>	Text Approximate	8 (render p008) · 3.3 · Fig. S10 referenced
ORR current retention after methanol additionMarked as a best value within this paper	98% after 200 s	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6F
ORR onset potential for Se-doped MOF CoS2Marked as a best value within this paper	0.952 V vs RHE	—	—	Text Exact Reported	7-8 (render p007-p008) · 3.3 · Fig. 6A; Fig. S9 referenced
ORR peak potential for Se-doped MOF CoS2Marked as a best value within this paper	0.798 V vs RHE	—	—	Text Exact Reported	7 (render p007) · 3.3 · Fig. 6A
ORR Tafel slope for bare glassy carbon	129.03 mV dec-1	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6B
ORR Tafel slope for MOF Co control	95.2 mV dec-1	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6B
ORR Tafel slope for MOF CoS2 control	63.4 mV dec-1	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6B
ORR Tafel slope for MOF CoSe control	79.7 mV dec-1	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6B
ORR Tafel slope for Se-doped MOF CoS2Marked as a best value within this paper	49.8 mV dec-1	—	—	Text Exact Reported	8 (render p008) · 3.3 · Fig. 6B

Rechargeable aqueous Zn-air battery OCV, specific capacity, charge-discharge, polarisation, power density and durability

Galvanostatic cycling

Zn-air battery with Se-doped MOF CoS2 hollow spheres air cathode · Electrode

Homemade liquid Zn-air battery with Zn foil anode, Se-doped MOF CoS2 air cathode, 6.0 M KOH/0.2 M zinc acetate electrolyte; comparison with Pt/C + IrO2.

Atmosphere: air cathode
Geometry: Zn foil 0.25 mm; carbon cloth air cathode
Context: application device using target catalyst compared with benchmark Pt/C + IrO2
Measurement source: 3 and 10 (render p003 and p010) · 2.6; 3.5 · Fig. 8

Property	Reported value	Normalised value	Uncertainty	Origin and quality	Source
Zn-air battery charge voltage with Se-doped MOF CoS2 cathode	1.97 V at 5 mA cm-2	—	—	Text Exact Reported	10-11 (render p010-p011) · 3.5; Conclusions · Fig. 8C
Zn-air galvanostatic discharge stability durationMarked as a best value within this paper	no discernible decline throughout 100 h discharge at 5 mA cm-2	—	—	Text Qualitative	10 (render p010) · 3.5 · Fig. 8C and Fig. S16 referenced
Zn-air battery discharge voltage with Se-doped MOF CoS2 cathode	1.20 V at 5 mA cm-2	—	—	Text Exact Reported	10-11 (render p010-p011) · 3.5; Conclusions · Fig. 8C
Voltage gap rise after 500 cycles for Se-doped MOF CoS2 Zn-air batteryMarked as a best value within this paper	0.13 V rise after 500 cycles	—	—	Text Exact Reported	10 (render p010) · 3.5 · Fig. 8C
Zn-air battery open-circuit voltage with Pt/C/IrO2 cathode	1.428 V	—	—	Text Exact Reported	10 (render p010) · 3.5 · Fig. 8A
Zn-air battery open-circuit voltage with Se-doped MOF CoS2 cathodeMarked as a best value within this paper	1.459 V	—	—	Text Exact Reported	10 (render p010) · 3.5 · Fig. 8A
Maximum power density with Pt/C/IrO2 cathode	104.56 mW cm-2	—	—	Text Exact Reported	10 (render p010) · 3.5 · Fig. 8D
Maximum power density with Se-doped MOF CoS2 cathodeMarked as a best value within this paper	156.24 mW cm-2	—	—	Text Exact Reported	10 (render p010) · 3.5 · Fig. 8D
Zn-air battery round-trip efficiency	62%	—	—	Text Exact Reported	10 (render p010) · 3.5 · Fig. 8C
Zn-air battery specific capacity with Pt/C/IrO2 cathode	563.23 mAh gZn-1 at 20 mA cm-2	—	—	Text Exact Reported	10 (render p010) · 3.5 · Fig. 8B
Zn-air battery specific capacity with Se-doped MOF CoS2 cathodeMarked as a best value within this paper	620.67 mAh gZn-1 at 20 mA cm-2	—	—	Text Exact Reported	10 (render p010) · 3.5 · Fig. 8B
Zn-air battery charge-discharge voltage gapMarked as a best value within this paper	0.77 V	—	—	Text Exact Reported	10 (render p010) · 3.5 · Fig. 8C