Self-Supported CoFe-P Nanosheets as a Bifunctional Catalyst for Overall Water Splitting

Abstract

Highly efficient and stable dual-function electrocatalysts for overall water splitting are of great significance to promote the application of hydrogen energy. Constructing a bimetallic phosphide nanocomposite structure can enhance active sites and accelerate electron transfer, which is beneficial to electrocatalysis. Herein, we obtained self-supporting cobalt-iron phosphide nanosheets supported on foamed nickel through twostep hydrothermal and phosphating treatment. When the CoFe-P/ NF-1 electrode material reaches 100 mA cm −2 , only a HER overpotential of 180 mV is required. Moreover, the overpotential for OER is 275 mV at 200 mA cm −2 . The overall water splitting electrolyzer assembled by CoFe-P/NF-1 can reach a current of 10 mA cm −2 at 1.57 V. The catalytic performance is better than the currently reported transition metal-based catalysts, and it exhibits excellent stability. This work provides a design idea of transition metal phosphide used in overall water splitting catalysis.

Ni-Doped Ti3CNTx-Coated Nanoporous Covalent Organic Frameworks to Accelerate Hydrogen Diffusion for Enhanced Hydrogen Evolution

“…Hydrogen is considered a substitute for natural gas and oil, and it has been widely studied to overcome the current energy crisis. , At present, a relatively mature method for hydrogen evolution is the overall water splitting with a platinum group noble metal cathode . The purity of hydrogen evolution by this method is high, and the source and combustion products are both water, which is convenient and easy to obtain . At present, there is a trend to look for low-cost and high-efficiency noble metal-free catalysts because the utilization cost of Pt metal is high and unsustainable .…”

Optimised Ni3+/Ni2+ and Mn3+/Mn2+ Ratios in Nickel Manganese Layered Double Hydroxide for Boosting Oxygen and Hydrogen Evolution Reactions

“…[4] However, their practical application is limited due to their high price, scarcity, narrow pH operating range, and large energy loss. [5,6] In general, OER electrocatalysts perform well in alkaline environments, whereas HER electrocatalysts excel in acidic environments. Moreover, both OER and HER electrocatalysts exhibit poor catalytic activity in neutral electrolytes due to proton liability.…”

“…Typically, noble metal catalysts such as ruthenium oxide (RuO 2 ) or iridium oxide (IrO 2 ) and platinum (Pt) have shown outstanding electrocatalytic activity for OER and HER, respectively, in an acidic electrolyte [4] . However, their practical application is limited due to their high price, scarcity, narrow pH operating range, and large energy loss [5,6] . In general, OER electrocatalysts perform well in alkaline environments, whereas HER electrocatalysts excel in acidic environments.…”

Hexamethylenetetramine induced multidimensional defects in Co2P nanosheets for efficient alkaline hydrogen evolution

“…The introduction of defects can not only expose a large number of coordination unsaturated sites, but also promote ion diffusion and charge transfer. 5–8 Metal or heteroatom vacancies are obtained by doping, etching, hydrogen reduction, etc. , resulting in zero-dimensional defects in the crystal structure.…”

“…The introduction of defects can not only expose a large number of coordination unsaturated sites, but also promote ion diffusion and charge transfer. [5][6][7][8] Metal or heteroatom vacancies are obtained by doping, etching, hydrogen reduction, etc., resulting in zerodimensional defects in the crystal structure. 9,10 Although zero dimensional defect can increase the active sites and change the electronic structure, the vacancy structure is usually unstable.…”