Electrochemical study of the promoting effect of Fe on oxygen evolution at thin ‘NiFe–Bi’ films and the inhibiting effect of Al in borate electrolyte

Abstract

Adding Fe3+ or Al3+ to the electrolyte resulted in fast promotion or poisoning, respectively, of catalysis for oxygen evolution at nickel–borate, and both effects were accompanied with anodic shifts in the redox peaks with potential scanning.

Advanced Bifunctional Oxygen Reduction and Evolution Electrocatalyst Derived from Surface‐Mounted Metal–Organic Frameworks

“…Adjustment of the Ni/FeFeeding Ratio and Deposition Cycles of 1-H for the Optimization of the OER Performance TheOER activity of NiFe-based oxo-hydroxo compounds typically correlates with the Ni to Fe ratios and deposition cycles. [17] Thus,westudied the electrocatalytic activity of 1 À H with different Ni/Fefeeding ratios and adifferent number of deposition cycles.T he corresponding NiFe-BDC SURMOFs were prepared on self-assembled monolayer modified electrodes by al iquid phase layer-by-layer deposition technique ( Figure 1a,b,T able S6 and Figure S1 in the Supporting Information). Afterwards,t hey were transformed into NiFebased oxy-hydroxides (SURMOFDs) in alkaline electrolytes ( Figure 1c,d and [Eq.…”

Ultrafine α-CoOOH Nanorods Activated with Iron for Exceptional Oxygen Evolution Reaction

“…51 Different reactions have different Tafel slopes depending upon the rate-determining step due to different intermediate coverage, uncompensated resistance at higher potentials, and structural changes. 52,53 Therefore, α-Fe 0.24 Co 0.76 OOH/NF exhibits outstanding OER electrocatalysis. The electrochemical impedance spectroscopy (EIS) of α-Fe 0.24 Co 0.76 OOH/NF and α-CoOOH/NF is shown in Figure 8c.…”

Superactive NiFe-LDH/graphene nanocomposites as competent catalysts for water splitting reactions

“…Recently, layered double hydroxides combinations of Ni with Fe as impurities in Ni(OH) 2 were noted to lower the overpotential of OER in Ni-based alkaline batteries. [49][50][51] The incorporation of Fe impurities as 0.01% in NiFe has a strong effect in lowering the overpotential of the OER. [49][50][51] Generally, NiFe-based materials such as NiFe alloys, [52][53][54] oxides, 54 and (oxy) hydroxides, [54][55][56] are used as earth-abundant catalysts that are effective for the OER under basic media.…”

“…[49][50][51] The incorporation of Fe impurities as 0.01% in NiFe has a strong effect in lowering the overpotential of the OER. [49][50][51] Generally, NiFe-based materials such as NiFe alloys, [52][53][54] oxides, 54 and (oxy) hydroxides, [54][55][56] are used as earth-abundant catalysts that are effective for the OER under basic media. Active surface areas containing copious amounts of active sites are among the major strategies for fabricating OER electrocatalysts, whereas, in this race, the morphological alteration of NiFe electrocatalysts could fulfill these strategies.…”

“…Among the vast investigations in these diverse fields of water splitting, [89][90][91] NiFe-LDH/2D-graphene and 3D-graphene composites have shown their potential towards activities in the electrocatalytic OER, as an anode material in PEC, and in a few cases as a photocatalyst for H 2 and O 2 evolution. 22,33,[49][50][51][52][53][54][55][56]59 In general, the NiFe-LDH/graphene combination gives deep insight into the structural impact of NiFe-LDHs, with the interfacial function of graphene by establishing a relationship between structure and activity. In recent years, there have been reports work based on either NiFe-LDH or NiFe-LDH/graphene for its oxygen electrochemistry; 83,92,93 however, much emphasis was placed on the distortion of the lattice structure, synthetic methods, morphology and catalytic studies.…”