Serpentine CoxNi3-xGe2O5(OH)4 nanosheets with tuned electronic energy bands for highly efficient oxygen evolution reaction in alkaline and neutral electrolytes

Cobalt–Nickel Phosphate Composites for the All-Phosphate Asymmetric Supercapacitor and Oxygen Evolution Reaction

“…Recently, many non-noble pseudocapacitive electromaterials, especially phosphate electromaterials (e.g., Am Fe–Co 3 (PO 4 ) 2 , Ni–Co–TEP, Ni–Co hydrogen phosphate, Mn 3 (PO 4 ) 2 ·3H 2 O, Co 3 (PO 4 ) 2 ·8H 2 O, and Fe–InPO 4 ), also show the excellent OER property in the alkaline system because their electrochemical mechanisms both involve the high-efficiency charge transfer by activated metal elements and then undergo different redox reactions with the different applied potentials. , Thus, there are the same effect factors (e.g., morphology, conductivity, and porosity) for electromaterials in capacity and OER, and the abovementioned property could be improved by various physicochemical means (e.g., compositing other functional materials, doping heteroatom, ,, controlling the ratio of different transition metals, , and ultrasonic treatment). However, different from the simple redox energy-storage mechanism of the battery-type and pseudocapacitive electromaterials, OER is a more complex electrochemical reaction, which involves more electron transfer processes and the desorption of active species, , resulting in a possible result that the greater capacity of the electromaterial may not be indicating the stronger OER property. Interestingly, there are few reports about this question.…”

The Pivotal Role of s‐, p‐, and f‐Block Metals in Water Electrolysis: Status Quo and Perspectives

“…Since the effects of Te have also been discussed in previous literature, [232,233] herein we focus on B, Si, Ge, As, and Sb as a component. Actually, the purpose of a metalloid in electrocatalysts for water splitting is somewhat related to the role of a lean metal: [234][235][236][237][238][239][240][241][242] i) the metalloid is a key component to form intermetallics, which transform into a core-shell architecture for efficient catalysis during the OER process; ii) doping of the catalyst with a metalloid can induce an oxygen vacancy, which then alters the catalytic mechanism and/or regulates the free adsorption ability during catalysis; iii) some of the metalloid-based compounds can function as an effective support to confine specific cluster formation and single atoms; iv) some of the metalloids can also be prepared in the form of single atoms and can serve as the catalytic active sites to catalyze the HER; v) some metalloids possess a unique photothermal effect, i.e., it can effectively absorb the light and lead to the increase of temperature for the local part of electrocatalyst), which can boost the catalytic kinetics. In consideration of the above points, Driess and co-workers recently synthesized a series of intermetallics consisting of Fe or Ni and metalloids (Si, Ge, As) for OER using the single-source molecular precursor approach and arc-melting method.…”

Electrocatalytic Water Splitting: From Harsh and Mild Conditions to Natural Seawater

“…The in situ Raman spectroscopy was applied to monitor the real-time intermediates during the reaction steps [66] and the surface terminal Mn(IV)O species was directly observed, and the proposed OER mechanism is shown in Figure 4e. Liu et al [67] synthesized a serpentine structured Co 2.4 Ni 0.6 Ge 2 O 5 (OH) 4 , which required 520 mV to achieve 10 mA cm -2 in 0.05 m PBS. Wen et al [68] designed an oxygen-incorporated amorphous CoS 4.6 O 0.6 porous nanocubes, which required 1.8 V to reach 4.59 mA cm -2 in 0.1 m PBS.…”