Hollow POM@MOF hybrid-derived porous Co₃O₄/CoMoO₄ nanocages for enhanced electrocatalytic water oxidation

Abstract

Co3O4/CoMoO4 nanocages with an ultrafine crystallite size and high surface area derived from hollow H3PMo12O40@ZIF-67 hybrids exhibit high-performance for electrocatalytic oxygen evolution.

Zeolitic Imidazolate Framework-Mediated Synthesis of Co3O4 Nanoparticles Encapsulated in N-Doped Graphitic Carbon as an Efficient Catalyst for Selective Oxidation of Hydrocarbons

“…38 The corresponding pore size distributions as calculated from system, a similar observation is seen in related nanosystems. [43][44][45] Interestingly in our case, the shakeup satellites have larger spectral weight, which we attribute to the presence of further components coming from the interaction Co 3 O 4 and nitrogen-doped carbon skeleton through…”

An Intriguing Pea‐Like Nanostructure of Cobalt Phosphide on Molybdenum Carbide Incorporated Nitrogen‐Doped Carbon Nanosheets for Efficient Electrochemical Water Splitting

“…In this study,ametal-organic framework based synthetic route to couple two non-noble-metalbased catalysts, CoP and Mo 2 C, supported on nitrogen-doped carbon has been developed. [35] In our study, molybdenum is introduced into the cavity of the ZIF moiety as molybdate ions to form ah ybrid ZIF assembly (HZIF) [29][30][31] that has been used as the precursor to fabricate CoP-Mo 2 Co n carbon cloth (CC). This composition boosts the electrochemicala lkaline water-splitting reactionb ys howingo verpotentials (h 10 )o fo nly 94 and 265 mV for the hydrogen evolution reaction(HER) and oxygen evolution reaction (OER), respectively,a tacurrentd ensity of 10 mA cm À2 .A dditionally,i na na cidic medium, the h 10 values are 107 and 330 mV for HER andO ER, respectively;t his suggests good bifunctionality at both lower and higherp Hl evels.…”

“…[36] Shake-up satellites are found at 786.4 and 802.8 eV for the two doublets: Co 2p 3/2 and Co 2p 1/2 ,r espectively.T he deconvoluted Mo 3d XPS profile represents the assigned peaks of Mo 2 Ca t2 28.4/231.5 eV andm olybdenum oxide at 232.5/ 235.6 eV for Mo 3d 5/2/ Mo 3d 3/2 ( Figure 2c). [29][30][31] The C1sX PS peak comprises C=C( 284.3 eV), CÀN( 285.6 eV), and CÀO( 286.6 eV). [29][30][31] The C1sX PS peak comprises C=C( 284.3 eV), CÀN( 285.6 eV), and CÀO( 286.6 eV).…”

Bimetal/Metal Oxide Encapsulated in Graphitic Nitrogen Doped Mesoporous Carbon Networks for Enhanced Oxygen Electrocatalysis

“…ZIF-8 and ZIF-67 were chosen for formation of core-shell structure due to their isoreticular structures and similar unit cell parameters (from reports, ZIF-8 has a = b = c = 16.9910 Å [27] and ZIF-67 has a = b = c = 16.9589 Å [28] ) which can lead to a stable structure. [5,29] Apart from the previous works, here the size distribution of uniform ZIF-8 seeds was successfully tuned between 50-130 nm without using any capping agents. The direct optical observation showed the initial results of successful incorporation of ZIF-67 on to ZIF-8 (denoted as ZIF-67 on ZIF-8).…”

“…Polymer electrolyte membrane fuel cells (PEMFC) [1] and rechargeable metal-air batteries [2] are the potential solutions for storing and converting renewable energy in room temperature. [5,6] Mechanisms and reaction intermediates of ORR and OER are very different and they proceed through multielectron transfer reactions. [3,4] Hitherto, Pt and its alloys are most efficient electrocatalyst for ORR while IrO 2 and RuO 2 are best for OER.…”