Phosphorus and Aluminum Codoped Porous NiO Nanosheets as Highly Efficient Electrocatalysts for Overall Water Splitting

Abstract

We present a facile way to fabricate phosphorus and aluminum codoped nickel oxide-based nanosheets by using layered double hydroxide (AlNi-LDH) as precursors, which showed an overall water-splitting performance in alkaline solution. The codoping of phosphorus and aluminum into nickel oxide nanosheets leads to an optimum balance among surface chemical state, electrochemically active surface area, and density of active sites. As a result, it can afford a current density of 100 mA cm–2 at the overpotential of 310 mV for oxygen evolution reaction (OER) and a current density of 10 mA cm–2 at the overpotential of 138 mV for hydrogen evolution reaction (HER) in 1 M KOH. When it was used as a bifunctional catalyst in a two-electrode water-splitting device, a potential of 1.56 V was achieved at the current density of 10 mA cm–2.

Constructing Conductive Interfaces between Nickel Oxide Nanocrystals and Polymer Carbon Nitride for Efficient Electrocatalytic Oxygen Evolution Reaction

“…Developing efficient and cost‐effective OER electrocatalysts is of great importance . To date, numerable catalysts composed of transition‐metal oxides, hydroxides, phosphides, and sulfides have been developed as low‐cost alternatives to precious metal compounds. Among them, the transition‐metal oxides including NiO, Co 2 O 3 , Fe 2 O 3 , etc.…”

Dual Doping Induced Interfacial Engineering of Fe2N/Fe3N Hybrids with Favorable d‐Band towards Efficient Overall Water Splitting

“…Similar to Al, Co have shown to be an effective dopant both in OER and HER because it could enable catalytic stability and facilitate mass transfer for overall water‐splitting processes . Thus, selecting two metal cations such as Co and Al could create strong electronic interaction within the catalysts for enhanced electrocatalytic activity …”

Experimental and Theoretical Investigation of the Effect of Oxygen Vacancies on the Electronic Structure and Pseudocapacitance of MnO2

“…[4,5] Electrochemicald ouble-layer capacitors (EDLCs) store the charge by formingadouble layer of opposing ions, [6,7] generally employing graphene, [8] carbon nanotubes [9,10] or activated carbon [11] as electrodes. Another type is pseudocapacitors, which can be used to achievee nergy storaget hrough Faraday charget rans-fer;t he electrode materials are usually formed from conducting polymers and transition metal oxides/hydroxides, such as NiO, [12,13] MnO 2 , [14] Co 3 O 4 , [15] MoS 2 , [3] andN i(OH) 2.…”