Preparation, characterization, and electrocatalytic oxidation properties of iron, cobalt, nickel, and indium hexacyanoferrate

Achievements, Challenges, and Prospects of Calcium Batteries

“…37−39 Due to the advent of the LIB technology in the 1970s, which concentrated most research efforts to Li + , research on multivalent systems fell into oblivion, but the field started to re-emerge in the early 2000s, with a few reports dealing with the feasibility of calcium intercalation in inorganic compounds. These included electrochemical studies of hexacyanoferrates using an aqueous electrolyte 40,41 and combining electrochemistry and other characterization techniques (mostly powder X-ray diffraction, or XRD hereafter) with V 2 O 5 as the host using Ca(ClO 4 ) 2 in either ACN or PC as electrolytes. 42−44 In the following decade and in line with the growing awareness about the imperative evolution toward electrification of transportation and energy storage needs for renewable energy, the efforts in the area were reinforced.…”

“…Turning to water, real aqueous electrolytes as well as water present in conventional aprotic electrolytes have been shown to stimulate formation of a calcium hydroxide film passivating a Ca metal anode. 32 Hexacyanoferrates were used as cathodes in the early 2000s, 40 and more recently, this system has been reinvestigated, 41 also using nonaqueous electrolytes, 52 showing both a very reversible electrochemical response and enhanced capacity from the water addition. As an example, ca.…”

“…Despite most studies being devoted to intercalation of lithium and other alkali ions, attempts to chemically intercalate other ions such as Ca 2+ for comparative purposes were common, either from aqueous solutions of the corresponding hydroxides or from the metal dissolved in liquid ammonia. − Due to the advent of the LIB technology in the 1970s, which concentrated most research efforts to Li + , research on multivalent systems fell into oblivion, but the field started to re-emerge in the early 2000s, with a few reports dealing with the feasibility of calcium intercalation in inorganic compounds. These included electrochemical studies of hexacyanoferrates using an aqueous electrolyte , and combining electrochemistry and other characterization techniques (mostly powder X-ray diffraction, or XRD hereafter) with V 2 O 5 as the host using Ca­(ClO 4 ) 2 in either ACN or PC as electrolytes. − …”

Water Oxidation at Electrodes Modified with Earth‐Abundant Transition‐Metal Catalysts

“…[267][268][269] In the field of electrocatalysis, a number of derivatives have been used for the oxidation or reduction of organic materials. [270,271] In oxidation catalysis, [272,273] PB-modified electrodes have been developed to detect and quantify a variety of substrates such as hydra-zine, [274][275][276][277][278] vitamins, [279][280][281][282] amino acids, [283][284][285][286] nucleobases, [287] glucose, [288] and other biologically relevant molecules. [289][290][291][292][293][294] It has also been postulated that such derivatives could be used for electrocontrolled drug delivery.…”

Prussian Blue‐Derived Iron Phosphide Nanoparticles in a Porous Graphene Aerogel as Efficient Electrocatalyst for Hydrogen Evolution Reaction

“…The spectrum showing as trong band observed in 2084 cm À1 for FeHCF/GAs ample is attributed to the stretching frequency of -CN-ligand in FeHCF structure. [41] Whereas, after heatingw ith phosphide source, the -CN-stretching vibration is almost suppressed (Figure 2c), suggesting the elimination of CN ligand from the structure of FeHCF.T he weak band observeda tt he -CN-stretching frequency region for heated sample would stem from the GA structurei dentified from control experiment study ( Figure 2c). Based on -CN-stretching frequency analysis, the structural changes occurred in FeHCF MOF upon heating of FeHCF/GA is confirmed.…”