Synergistic electronic and morphological modulation on ternary Co1−xVxP nanoneedle arrays for hydrogen evolution reaction with large current density

Abstract

It is a great challenge to prepare non-noble metal electrocatalysts toward hydrogen evolution reaction (HER) with large current density. Synergistic electronic and morphological structures of the catalyst have been considered as an effective method to improve the catalytic performance, due to the enhanced intrinsic activity and enlarged accessible active sites. Herein, we present novel ternary Co 1−x V x P nanoneedle arrays with modulated electronic and morphological structures as an electrocatalyst for highly efficient HER in alkaline solution. The NF@Co 1−x V x P catalyst shows a remarkable catalytic ability with low overpotentials of 46 and 226 mV at current densities of 10 and 400 mA cm −2 , respectively, as well as a small Tafel slope and superior stability. Combining the experimental and computational study, the excellent catalytic performance was attributed to the improved physical and chemical properties (conductivity and surface activity), large active surface area, and fast reaction kinetics. Furthermore, the assembled Co-V based electrolyzer (NF@Co 1−x V x-HNNs(+)||NF@Co 1−x V x P(−)) delivers small full-cell voltages of 1.58, 1.75, and 1.92 V at 10, 100, and 300 mA cm −2 , respectively. Our findings provide a systematic understanding on the V-incorporation strategy to promote highly efficient ternary electrocatalysts via synergistic control of morphology and electronic structures.

Modulating Electronic Structure of an Au‐Nanorod‐Core–PdPt‐Alloy‐Shell Catalyst for Efficient Alcohol Electro‐Oxidation

“…Consequently, the advantages of the designed catalysts in this study are well illustrated when compared with non‐noble metal catalysts in terms of their performance and electronic structures. [ 54–57 ]…”

“…Consequently, the advantages of the designed catalysts in this study are well illustrated when compared with non-noble metal catalysts in terms of their performance and electronic structures. [54][55][56][57] A completed MOR process is then proposed (Figure S14, Supporting Information) after taking the optimized structures of adsorbates generated during the MOR on the model catalysts of PdPt (100)-0% (Figure S15 end of the MOR. The former seems much more crucial than the latter for the MOR; in that the excitation of CH 3 OH is the precondition for the MOR.…”

Oxygen Vacancies and Interface Engineering on Amorphous/Crystalline CrOx‐Ni3N Heterostructures toward High‐Durability and Kinetically Accelerated Water Splitting

“…Recently, the fabrication of single atom catalysts has been considered as a feasible strategy to boost the HER performance of noble‐metal‐based electrocatalysts, when a small loading mass of active noble‐metal centers can significantly lower the cost. [ 3 ] Some interesting non‐noble catalysts, such as metal oxides/hydroxides, [ 4 ] sulfides, [ 5 ] selenides, [ 6 ] phosphides, [ 7 ] and nitrides, [ 8 ] have also been studied as promising alternatives for alkaline water electrolyze. Among these electrocatalysts, metal nitrides have demonstrated remarkable catalytic performance due to their high electrical conductivity originating from the metallic property, favorable electronic structure, and high anti‐corrosion.…”

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

“…Through synergistic control of morphology and electronic conductivity features, ternary Co 1− x V x P nanoneedle arrays exhibited a notable catalytic HER activity with low overpotentials of ≈46 and ≈226 mV versus RHE at current densities of 10 and 400 mA cm −2 , respectively; a small Tafel slope and good stability were also achieved. [ 289 ] The NF@Co 1− x V x ‐hydroxide needles revealed an excellent OER performance. In addition, the assembled Co–V based electrolyzer based on NF@Co 1− x V x ‐hydroxide needles, as an anode, and NF@Co 1− x V x P, as a cathode, can deliver lower overall water splitting‐cell voltages of 1.58, 1.75, and 1.92 V at 10, 100, and 300 mA cm −2 , respectively.…”