Ultrafine CoP Nanoparticles Supported on Carbon Nanotubes as Highly Active Electrocatalyst for Both Oxygen and Hydrogen Evolution in Basic Media

Abstract

The development of low-cost and highly active electrocatalysts for two half reactions: H2 and O2 evolution reactions (HER and OER), is still a huge challenge to realize water splitting. Herein, we report that CoP nanoparticles (NPs) can act as a bifunctional catalyst for both HER and OER. Particularly, ultrafine CoP NPs decorated on N-doped multiwalled carbon nanotube (MWCNT) exhibit remarkable catalytic performance for OER in 0.1 M NaOH aqueous solution, with a low onset overpotential of 290 mV, a Tafel slope of 50 mV dec(-1), an overpotential (η) of 330 mV at 10 mA cm(-2), and approximately 100% Faradaic efficiency, paralleling the performance of state-of-the-art Co-based OER catalysts including Co3O4, CoSe2, and Co-Pi. The hybrid catalyst is capable of maintaining a high catalytic current density for at least 10 h without any loss of catalytic activity. Meanwhile, the noble-metal-free catalyst also shows good activity and duarability for HER under the same basic condition.

Solar‐to‐Hydrogen Energy Conversion Based on Water Splitting

“…[159,160] The doping of Fe III can, in principle, induce oxygen vacancies for easier polaron hopping to the neighboring atoms, which brings about improved charge mobility. [171][172][173][174][175][176][177][178][179][180] These inorganic materials are considered as "interstitial alloys," showing a dominant (semi)metallic nature. However, there is still debate on whether the Ni II sites or the Fe III sites are the real active OER centers in the NiFe-based materials.…”

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

“…Lasers are ap owerful light source that can be used for av ariety of applications,w hich typically include welding, [1] cutting, [2,3] surveying, [4] barcode scanners, [5] and medical applications. Lasers are ap owerful light source that can be used for av ariety of applications,w hich typically include welding, [1] cutting, [2,3] surveying, [4] barcode scanners, [5] and medical applications.…”

Facile synthesis and excellent electrochemical performance of CoP nanowire on carbon cloth as bifunctional electrode for hydrogen evolution reaction and supercapacitor

“…CC (black curve) shows two diffraction peaks, at around 25°and 43°, which can also be observed in the XRD of CoP/CC. [14,19]. Compared to the XRD of Co(OH)F/CC (as shown in Fig.…”

“…Therefore, the discovery of a non-precious electrocatalyst with long-life cycling stability, high activity and low cost for HER is critically important. Recently, transition metal sulfides (WS 2 , MoS 2 , CoS 2 ) [10,16], transition metal hydroxides (Ni(OH) 2 , Co(OH) 2 ) [17,18], and transition metal phosphides (Ni x P, Co x P, Fe x P, Fe-CoP) [19][20][21][22][23] have been investigated as efficient, low-cost and nonprecious catalysts for HER, displaying high performance. Consequently, transition metal phosphide materials have received significant attention as active HER catalysts [19,24].…”

“…Furthermore, flexible electrodes will play an important role for electrocatalysts in flexible water splitting devices and supercapacitors in flexible electronic devices [19,24,30]. Herein, we developed a two-step strategy for synthesizing cobalt phosphide (CoP) nanowires supported on carbon fiber cloth (CC) (CoP/CC) as electrocatalyst for HER and electrode material for supercapacitor.…”