Promoted Electrocatalytic Nitrogen Fixation in Fe‐Ni Layered Double Hydroxide Arrays Coupled to Carbon Nanofibers: The Role of Phosphorus Doping

Abstract

The key to bringing the electrocatalytic nitrogen fixation from conception to application lies in the development of high‐efficiency, cost‐effective electrocatalysts. Layered double hydroxides (LDHs), also known as hydrotalcites, are promising electrocatalysts for water splitting due to multiple metal centers and large surface areas. However, their activities in the electrocatalytic nitrogen fixation are unsatisfactory. Now, a simple and effective way of phosphorus doping is presented to regulate the charge distribution in LDHs, thus promoting the nitrogen adsorption and activation. The P‐doped LDHs are further coupled to a self‐supported, conductive matrix, that is, a carbon nanofibrous membrane, which prevents their aggregation as well as ensuring rapid charge transfer at the interface. By this strategy, decent ammonia yield (1.72×10−10 mol s−1 cm−2) and Faradaic efficiency (23 %) are delivered at −0.5 V vs. RHE in 0.1 m Na2SO4.

Engineering a Hierarchical Biphasic Gel for Subcutaneous Vascularization

“…In contrast to a previous study which assembled fragmented electrospun nanofiber membranes into 3D building blocks, [19] we used microfibrillated cellulose (Celova) and PE (Short Stuff) as raw materials, as they are of uniform fiber length and because highly fibrillated fibers can be more easily and stably dispersed in water. The sol dispersion of cellulose (length = 2000 μm; diameter = 20 μm) and PE (length = 600 μm; diameter = 15 μm) microfibers at a weight ratio of 1:2 can remain stable for one week (Figure 2a).…”

Sulfur and phosphorus co-doped nickel–cobalt layered double hydroxides for enhancing electrochemical reactivity and supercapacitor performance

“…† When doping the S and P elements simultaneously, NiCo LDH-SP (1) shows almost the same pattern with no newly detected peaks or existing peak shis compared to the NiCo LDH-S. Perhaps, it is considered that P elements did not create a new crystal structure due to the low P content (Table S1 †). 31 Therefore, there may be some concern as to whether the P is doped into the lattice or is present in the interlayers. When a NiCo LDH-SP (1) sample was measured in XPS and TEM (including EDS) requiring an ultrahigh vacuum pressure of 10 À6 to 10 À9 Pa, P elements were detected as P 2p XPS spectrum and EDS images as shown in Fig.…”

Regulating the spin order of transition metal embedded-MXenes for boosting electrocatalytic nitrogen reduction to ammonia

“…One of the prominent transition metal families, iron in its high spin state and nickel in its low spin state are widely studied for spin-based catalysis. [47][48][49][50][51][52] In this work, Mo 2 CS 2 -MXenes were considered as our focus of interest for the substrate material by adopting a rstprinciples calculation approach. Two single-atom catalysts of Fe/Ni and three di-atom catalysts of Fe & Fe/Ni & Ni/Fe & Ni are designed by introducing Fe in the high spin state and Ni in the low spin state on the material surface, and the potential barriers of the full reaction path of the eNRR are determined.…”