Fabrication of Porous Configurated Ni₂P/Ni Foam Catalyst and its Boosted Properties for pH‐universal Hydrogen Evolution Reaction and Efficient Nitrate Reduction

Abstract

Nickel phosphide (Ni 2 P) has been widely explored toward hydrogen evolution reaction (HER) for desirable durability and high performance. Tuning the electronic structures and morphologies of Ni 2 P plays a pivotal role in the improvement of HER performance. In this work, three Ni 2 P catalysts were fabricated by different strategies and their HER properties were compared. It was found that the bicontinuous porous structured Ni 2 P on Ni foam (Ni 2 P /NFÀ EHP) prepared using coupled electroless nickel-phosphorus (NiÀ P) plating, hydrothermal synthesis and low temperature phosphorization techniques, exhibits the best catalytic activity and a wide pH adaptability. The overpotential at 10 mA cm À 2 and Tafel slope are 78 mV and 33 mV dec À 1 in 0.5 M H 2 SO 4 , those in 1 M PBS are 125 mV and 93 mV dec À 1 , and 101 mV and 76 mV dec À 1 in 1 M KOH. Additionally, the Ni 2 P/NFÀ EHP-catalyzed HER process is also applicable for nitrate reduction with a remarkable removal efficiency of 92.6 %. This catalyst also exhibits a desirable durability both in HER and nitrate reduction. This work offers an efficient strategy to exploit compatible pH-universal HER catalysts, explores the engineering application of HER process in nitrate reduction.

P-modified single-atom Cu catalyst for enhanced electrocatalytic performance of NO3- reduction to NH3

“…A pseudofirst-order kinetic rate law was derived and linearly fitted to obtain the apparent rate constant (K ap ) (Figure 3e). 30,31 The K ap value of Cu-N 4 /P was 8.8 times larger than that of Cu-N 4 , indicating that the reaction rate was significantly enhanced. Stability is one of the important parameters of an electrocatalyst and determines to some extent whether it has a real economic value or not.…”

Iron-Doped Cobalt Phosphide Nanohoops for Electroreduction of Nitrate to Ammonia

“…So far, advanced works indicate that non-noble metal nanostructures (such as copper, titanium, iron, nickel, cobalt, etc.) also reveal high electroactivity for the NIT-ERR.…”

Efficient Nitrate-to-Ammonia Electroreduction at Cobalt Phosphide Nanoshuttles

“…Since transition metal phosphides have excellent electroactivity for a hydrogen evolution reaction (HER), they may effectively electrocatalyze the NO 3 – -ERR. In fact, recent reports have demonstrated that Ni 2 P nanomaterials have obvious electroactivity for NO 3 – -ERR. , Although cobalt phosphide (CoP) nanomaterials also have Pt-like electroactivity for HER, ,, no work about NO 3 – -ERR at CoP nanoparticles is reported till now.…”

“…In fact, recent reports have demonstrated that Ni 2 P nanomaterials have obvious electroactivity for NO 3 − -ERR. 29,30 Although cobalt phosphide (CoP) nanomaterials also have Pt-like electroactivity for HER, 20,31,32 no work about NO 3…”