Insight into electrochemical performance of porous FexSiy intermetallic anode for zinc electrowinning

Perspective on intermetallics towards efficient electrocatalytic water-splitting

“… 224 In addition, porous Fe 3 Si, Fe 5 Si 3 , and FeSi have been prepared as intermetallic anode for zinc electrowinning. While the Fe 3 Si showed the best OER performance with η 10 = 955 mV and a Tafel slope of 253 mV dec −1 , the Fe 5 Si 3 ( η 10 = 1072 mV, Tafel slope = 327 mV dec −1 ) exhibited better stability over 400 h. 90 …”

“…220 For application in anion exchange membrane fuel cells, bifunctional cobalt and nickel silicide have been decorated on silicon-oxy-carbide (SiOC) and tested for OER and oxygen reduction reaction (ORR 224 In addition, porous Fe 3 Si, Fe 5 Si 3 , and FeSi have been prepared as intermetallic anode for zinc electrowinning. While the Fe 3 Si showed the best OER performance with η 10 = 955 mV and a Tafel slope of 253 mV dec -1 , the Fe 5 Si 3 (η 10 = 1072 mV, Tafel slope = 327 mV dec -1 ) exhibited better stability over 400 h. 90 FeNi 3 NPs on NC were synthesized by Mu and co-workers and the resulting FeNi 3 @NC electrocatalyst displayed excellent OER activity of η 10 = 277 mV (Tafel slope = 77 mV dec -1 ) in alkaline conditions which they attribute to the unique structure with improved physical properties. 225 To understand such systems more in-depth, Chen et al studied a series of Fe-Ni intermetallics on NC gaining deeper insight into the role of iron in the structure.…”

“…[82][83][84][85][86] The benign technique to develop and predesign intermetallic precursors for the catalytic application has given rise to a large number of water-splitting electrocatalysts. [87][88][89][90] For instance, Lasia and co-workers synthesized Ni-Mo 91 and Ni-Mo-Al 92 91,92 Similarly, a phase pure Ni 3 Al was prepared in vacuum at temperatures between 600-1250 C by the group of Liu. from commercially available Ni carbonyl and gas atomized Al powder as precursors.…”

Effects of Fe doping on preparation of Ti-Si porous membrane via in-situ reactive process

“…It is worth pointing out that some Kirkendall pores may be generated due to the asymmetric diffusion behavior in this in-situ reactive process based on the phase transition effect, because there is a certain diffusion rate difference between Ti, Fe and Si elements. Ti-Fe-Si ternary system has been investigated systemically by researchers [42][43][44][45][46]. Fig.…”

Two-step facile synthesis of Co3O4@C reinforced PbO2 coated electrode to promote efficient oxygen evolution reaction for zinc electrowinning

“…2 Therefore, lowering the anodic OER overpotential is the principal direction for energy saving in the zinc electrowinning process. 3 Generally, Pb-(0.5-1%)Ag alloy is the most extensively employed insoluble anode. 4,5 However, its deciencies, such as high overpotential, poor conductivity, and Pb contamination, are still tremendous challenges.…”