3D structured porous CoP₃ nanoneedle arrays as an efficient bifunctional electrocatalyst for the evolution reaction of hydrogen and oxygen

Abstract

Self-supported cobalt poly-phosphide nanoneedle arrays (CoP3 NAs) were prepared on carbon fiber paper (CFP) as an integrated 3D efficient bifunctional electrocatalyst.

Design and Application of Foams for Electrocatalysis

“…Besides metal oxides and LDHs, metal chalcogenide/phosphide‐based composites have also gained attention as alternative bifunctional catalytic electrodes toward whole water splitting by virtue of their good conductivity and activity . The catalytic activity of metal phosphide/chalcogenide‐based catalysts are mainly attributed to the proper surface of proton acceptor and hydride acceptor sites, leading to moderate bonding between sulphur/selenium/ phosphorus and reaction intermediates in the process of water splitting .…”

Structure–Activity Relationships for Pt‐Free Metal Phosphide Hydrogen Evolution Electrocatalysts

“…CoP electrocatalysts were also produced by HT method. For example, HT growth of Co(OH)F nanostructures on CC and CP is followed by the phosphorization with either NaH 2 PO 2 or red P to give self‐supported nonporous CoP nanowires or P‐rich CoP 3 nanoneedles . Importantly, addition of NH 4 F and urea to Co 2+ solution is required to obtain nanostructured Co(OH)F by HT treatment.…”

“…For example, HT growth of Co(OH)F nanostructures on CC and CP is followed by the phosphorization with either NaH 2 PO 2 or red Pt og ive self-supported nonporousC oP nanowires [53] or P-rich CoP 3 nanoneedles. [54] Importantly,a ddition of NH 4 Fa nd urea to Co 2 + solution is required to obtain nanostructured Co(OH)F by HT treatment. Herein, urea serves as ap recipitation agent, which continuously hydrolyses at elevated temperatures, forming CO 2 and aqueous ammonium hydroxide( CO(NH 2 ) 2 + 3H 2 O!CO 2 + 2NH 4 OH).…”

Synthesis and application of transition metal phosphides as electrocatalyst for water splitting

“…3D porous cobalt poly-phosphide nanostructure was also developed as an efficient bifunctional electrocatalyst by topotactic phosphidation of the Co(OH)F on carbon fiber paper. The 3D structure provides a large specific surface area which provides more catalytically active sites exposed to electrolyte and facilitates the mass transfer and interfacial charge carrier exchange [85]. This phosphidation approach was also used to convert MoS 2 nanosheet/carbon cloth and WO 3 nanowire/carbon cloth to MoP 2 nanosheet/carbon cloth and WP 2 nanowire/carbon cloth, respectively [86,87].…”