Engineering Hierarchical‐Dimensional Co(OH)F into CoP Superstructure for Electrocatalytic Water Splitting

Abstract

Multi-dimensional materials can combine the advantages of fast mass diffusion of high dimensional structures and advanced intrinsic properties of low dimensional substructures. In specific, superstructures are widely prepared from assembling low dimensional materials into arrays by complicated methods. We recently proposed the concept of hierarchical-dimensional material (HDM), in which superstructure is composed of low dimensional substructures from simple wet chemical method. Herein, we report the synthesis of a CoP HDM from the engineering of the hierarchical-dimensional Co(OH)F precursor by successive phosphorization and acid etching. The resulting CoP superstructure is built by porous CoP rod substructure. The rods weave together to form 2D mesh plates and the 2D mesh plates stack together to form the 3D superstructure. Thus, a very interesting structure is generated with 0D, 1D, 2D and 3D features. The CoP material displayed outstanding electrocatalytic activity for both HER and OER in alkaline solutions. The overpotentials required to drive a HER and OER current density of 10 mA/cm 2 were 94 mV and 295 mV, respectively. The superior performance is believed to be associated with the unique structure from phosphorus-based engineering of nanostructure.

Study on the catalytic activity and hydrothermal stability of one-pot synthesized Fe-based FER zeolites for NH3-SCR

“…The further investigation of Fe 3+ dimers in zeolites is temporarily unavailable as it requires the aid of advanced characterization methods such as EPR and Mössbauer spectroscopy. 41,65…”

Na Substitution Steering RuO6 Unit in Ruthenium Pyrochlores for Enhanced Oxygen Evolution in Acid

“…[12] The introduction of Na + is detrimental to the increase of the exposed area, as revealed by the Brunauer-Emmett-Teller (BET) surface areas for Gd 2 Ru 2 O 7-𝛿 (6.96 m 2 g −1 ) and Na x Gd 2-x Ru 2 O 7-𝛿 (4.07 m 2 g −1 ) in Figure S3, Supporting Information, excluding the effect of the number of active sites on acid OER. [25] In fact, the change of geometric structure for RuO 6 octahedra is the embodiment of charge rearrangement. The X-ray photoelectron spectra (XPS) were conducted to further analyze surface compositions and chemical states of Gd 2 Ru 2 O 7-𝛿 and Na x Gd 2-x Ru 2 O 7-𝛿 .…”

Recent Advances of Transition Metal Basic Salts for Electrocatalytic Oxygen Evolution Reaction and Overall Water Electrolysis

“…Nevertheless, it is no doubt that the synthetic strategy and the reasonable core-shell explanation of this work paves a way for TM basic salt-based OER pre-catalysts. After this pioneering work, Cao's group further investigated the impact of phase transition on Co(OH)F, and employed Co(OH)F as template to synthesize CoO and CoP for OER [126,127].…”