Three‐Dimensional Transition Metal Phosphide Heteronanorods for Efficient Overall Water Splitting

Abstract

The development of low‐cost electrocatalysts with excellent activity and durability for both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) poses a huge challenge in water splitting. In this study, a simple and scalable strategy is proposed to fabricate 3 D heteronanorods on nickel foam, in which nickel molybdenum phosphide nanorods are covered with cobalt iron phosphide (P‐NM‐CF HNRs). As a result of the rational design, the P‐NM‐CF HNRs have a large surface area, tightly connected interfaces, optimized electronic structures, and synergy between the metal atoms. Accordingly, the P‐NM‐CF HNRs exhibit a remarkably high catalytic activity for the OER under alkaline conditions and wide‐pH HER. For overall water splitting, the catalyst only requires a voltage of 1.53 V to reach a current density of 10 mA cm−2 in 1 m KOH with prominent stability, and the activity is not degraded after stability testing for 36 h. This new strategy can inspire the design of durable nonprecious‐metal catalysts for large‐scale industrial water splitting.

Significant Enhancement of Electrocatalytic Activity of Nickel-Based Amorphous Zeolite Imidazolate Frameworks for Water Splitting at Elevating Temperatures

“…7 The efficiency of the electrochemical water splitting is strictly dependent on the electrocatalysts and electrolytes. 8 Various kinds of electrocatalysts exist, i.e., noble metals and their compounds, 9,10 metal carbides, 11 nitrides, 12 phosphides, 13,14 oxides, 15 sulfides, 16 selenides, 16 telluride, 17 MXenes, 18 metal−organic frameworks (MOFs), 19 synthesis strategies for the enhancement of electrochemical characteristics of electrocatalysts for water splitting. There are also several other strategies to enhance the electrochemical characteristics of electrocatalysts for water splitting.…”

Hierarchical Ni2P/Zn–Ni–P nanosheet array for efficient energy-saving hydrogen evolution and hydrazine oxidation

“…19,34,39,40 Doping another metal to form bimetallic TMPs and encapsulation with carbon materials [41][42][43] or fabrication on conductive substrates are the main ways to improve their catalytic performance. 21,[44][45][46] In recent years, a lot of TMPs based catalysts have been widely studied for OWS; for example, Cheng's group reported CoP/CoMoP with Mo doped into CoP which showed extraordinary HER activity and robust stability due to the cooperative effect and interfaces between CoP and CoMoP. 47 However, there is not much research on the performance of TMPs in the HzOR or OHzS.…”

Single‐Step Solid‐State Scalable Transformation of Ni‐Based Substrates to High‐Oxidation State Nickel Sulfide Nanoplate Arrays as Exceptional Bifunctional Electrocatalyst for Overall Water Splitting

“…Alkaline water‐based overall water splitting has gained enhanced importance due to the high efficiency of the four‐electron transfer mediated OER. [ 4,5 ] In this context, various transition metal‐based oxides, [ 6–8 ] phosphides, [ 9 ] selenides, [ 8,10 ] sulfides, [ 11–13 ] carbides, [ 14 ] and nitrides [ 15 ] have been explored as electrocatalysts in basic media. Amongst these, transition metal‐based sulfides have shown efficiency to catalyze both hydrogen and oxygen evolution.…”