Hierarchical 3D flower like cobalt hydroxide as an efficient bifunctional electrocatalyst for water splitting

Optimised Ni3+/Ni2+ and Mn3+/Mn2+ Ratios in Nickel Manganese Layered Double Hydroxide for Boosting Oxygen and Hydrogen Evolution Reactions

“…Figure S11 shows the EIS measured at open circuit potential (no charge transfer occurs) and reveals the interfacial behavior of the electrode‐electrolyte interface [55] . The smaller value of the X‐axis intercept and lower Warburg tail in 0.05 M NiMn LDH represents the effective electrolyte ion diffusion [56] . The Tafel slope (Figure 8c, d) was calculated from the EIS by measuring the Nyquist plot at various OER and HER overpotentials (Figures S12 and S13) to check the influence of series and interfacial resistance.…”

“…[55] The smaller value of the X-axis intercept and lower Warburg tail in 0.05 M NiMn LDH represents the effective electrolyte ion diffusion. [56] The Tafel slope (Fig- ure 8c, d) was calculated from the EIS by measuring the Nyquist plot at various OER and HER overpotentials (Figures S12 and S13) to check the influence of series and interfacial resistance. The charge-transfer resistance (R ct ) increased with increasing the overpotential for both OER and HER, which reflects the increased affinity towards O 2 and H 2 evolution caused by the accumulation of more intermediate spices at the catalystelectrolyte interface.…”

Facile synthesis of porous transition metal hydroxides from a poly(4-vinyl pyridine) film by controlling pH

“…Conventionally, transition metal hydroxide-containing electrodes are prepared from a mixture of active transition metal hydroxides and carbon binders onto current collectors. [25][26][27][28] However, due to the peeling off of the mixture from the current collector and a serious interfacial resistance between transition metal hydroxides and a collector, the stability of the device is poor. In addition, the carbon binder reduces the active surface area and mass transfer of active ions and electrons.…”

Kinetically Controlled Mn Doping Effect on Composition Tuned CoMn Hydroxide Nanoflakes for Overall Water Splitting Application

“…[16] The Co(OH) 2 being the potent catalyst during OER, we have tried one-step deposition of CoOOH (Co 3 + ) which is more active than Co 2 + and would fasten the 4-electron process. [17,18] The Mn doping in Co can change the structural morphology and could result in an increased HER activity. The Mn 3 + surface states are well-acknowledged for their improved electrochemical properties towards water splitting processes since they control the imbalance between the *OH and *O radicals to boost the electrocatalytic activity.…”

“…The electrochemical properties of the mixed valance Co 2+ and Co 3+ in Co(OH) 2 /CoOOH heterostructures have indeed been demonstrated in water oxidation and recognized that Co 3+ cations are the most active sites for OER activity [16] . The Co(OH) 2 being the potent catalyst during OER, we have tried one‐step deposition of CoOOH (Co 3+ ) which is more active than Co 2+ and would fasten the 4‐electron process [17,18] . The Mn doping in Co can change the structural morphology and could result in an increased HER activity.…”