N‐Doped Carbon Nanotubes Encapsulating Ni/MoN Heterostructures Grown on Carbon Cloth for Overall Water Splitting

Abstract

Herein, we reported a new strategy to grow N‐doped carbon nanotubes encapsulating Ni/MoN heterostructures on carbon cloth (Ni/MoN@NCNT/CC). The high intrinsic activity in the interface engineering of the Ni/MoN heterostructures, the high conductivity and protection of NCNT, and the three‐dimensional structure of the Ni/MoN@NCNT/CC contribute to its outstanding activity and stability for HER (overpotential of 207 mV at 10 mA cm−2) and OER (overpotential of 252 mV at 10 mA cm−2). Particularly, for HER, it can maintain a consistent potential at 100 mA cm−2 for 100 h. Besides, for OER the generated surface roughness and larger surface area can enhance OER activity of the catalyst. When used as a bifunctional electrocatalyst for overall water splitting, it can achieve a current density of 10 mA cm−2 at a cell voltage of 1.699 V with excellent durability. This work provides a new strategy to fabricate three‐dimensional heterostructured water‐splitting electrocatalysts with large surface area.

Heterostructure from heteromixture: unusual OER activity of FeP and CoP nanostructures on physical mixing

“…Designing heterostructure interfaces to improve the electrocatalytic performance has attracted a lot of attention in recent years. [19][20][21][22][23][24] At the interface, the existence of inter-particle forces like van der Waals interactions, coulombic interactions, and other cohesive forces, inter-particle defects, and strain and disorders in the lattice extensively change the physical and chemical properties of the material towards electrochemical applications. [25][26][27][28] These originate from the modulation of the electronic structure and hence the electrochemical energetics of sorption of reaction intermediates at the active sites.…”

Factors Effecting and Structural Engineering of Molybdenum Nitride‐Based Electrocatalyst for Overall Water Splitting: A Critical Review

“…Additionally, it has remarkable physiochemical endurance, good electrical conductivity, and exceptional corrosive resistivity. In this regard, Wang et al [ 144 ] mainly focused on the two steps hydrothermal and nitridation treatment pathway prepared 3D bimetallic NiMoN nanoparticles grown in nitrogen coupled CNTs followed by covered under carbon cloth to evaluate its electrocatalytic water splitting. The aforementioned material demonstrated high catalytic performance productivity for the formation hydrogen and oxygen, needing just a modest electric potential of 207 and 252 mV to yield phenomenal current density of 10 mA cm −2 in 1 m basic electrolyte of KOH.…”

“…It is obvious that the Co 3 Mo 3 N is made up of nanorods, which is helpful for accommodating the chemical outflow and rate of diffusion. Composite substrates, on the other hand, frequently contain small surface-to-volume ratio and electroactive spots, which [144] Copyright 2020, John Wiley & Sons Inc.…”

Superaerophobic/superhydrophilic surfaces as advanced electrocatalysts for the hydrogen evolution reaction: a comprehensive review

“…55 In recent years, a variety of electrocatalysts with superb performance have been proposed for EWS. [56][57][58][59][60][61][62][63] Among the myriad of high-efficiency, recently synthesized electrocatalysts whose morphology has had a positive effect on improving their performance, a selection is introduced below, including Ru SAs/N-Mo 2 C NSs (43 mV at 10 mA cm À2 for the HER in 1.0 M KOH), 62 Fe@N-CNT/iron foam (523 mV at 10 mA cm À2 for the HER and 1.09 V for overall water splitting at 20 mA cm À2 in 0.5 M Na 2 SO 4 ), 63 Pt Cs/MoO 2 NSs-L (47 mV at 10 mA cm À2 for the HER in 0.5 M H 2 SO 4 ), 61 Ru NCs/Co 2 P HMs (77 mV at 10 mA cm À2 for the HER and 1.53 V at 10 mA cm À2 for overall water splitting in 0.5H 2 SO 4 ), 62 NiC-oP@NiMn LDH/NF (293 mV at 100 mA cm À2 for the OER, 116 mV at 100 mA cm À2 for the HER, and 1.59 V at 10 mA cm À2 for overall water splitting in 1.0 M KOH), 59 Ni 3 Sn 2 @NiO x H y /CNT (250 mV at 10 mA cm À2 and 355 mV at 300 mA cm À2 for the OER in 1.0 M KOH), 58 Ni/MoN@NCNT/CC (207 mV at 10 mA cm À2 for the HER, 252 mV at 10 mA cm À2 for the OER, and 1.699 V at 10 mA cm À2 for overall water splitting in 1.0 M KOH), 56 and Ni 2/ 3 Fe 1/3 Al (299 mV at 10 mA cm À2 for the OER in 1.0 M KOH). 57 As mentioned earlier, many resistances must be surmounted during the electrolysis process to make the water electrolysis reaction more efficient.…”