Preparation of Fe‐doped Transition Metal Phosphides using Ionic Liquid as Precursor for Efficient Oxygen Evolution Reaction

Abstract

For electrocatalysts in water splitting, activity and stability is at high are pivotal current density. Thus, transition metal phosphides were prepared using ionic liquid as precursor on nickel foam, where Fe was doped and this catalyst was covered by carbon. This Fe‐CoNiP−C/NF exhibits excellent OER activity, which only needs overpotentials of 355 and 424 mV to reach the current densities of 50 and 100 mA cm−2, respectively. Moreover, it obtains a good stability for more than 30 hours at 100 mA cm−2. Experimental results demonstrate part of this TMPs‐based catalyst is oxidized to metal oxyhydroxide species after phosphidation, which can significantly improve the activity for OER. Also, the low Fe doping and outer carbon enhance the OER activity and stability.

Internal and External Cultivation Strategy toward Efficient Electrochemical Oxygen Evolution in Cobalt Pentlandite

“…Additionally, the peaks at 791.6 eV (Co 2p 3/2 ) and 780 eV (Co 2p 1/2 ) were attributed to Co 3+ and also shifted to a lower energy level, indicating electron loss. And the two peaks located at 786.7 and 803.1 eV are satellite peaks. , For the Fe 2p spectra (Figure (c)), there are two peaks observed at 711.4 eV (Fe 2p 3/2 ) and 724.9 eV (2p 1/2 ), indicating the presence of Fe 2+ , while the peaks at 714 eV (Fe 2p 3/2 ) and 727.1 eV (2p 1/2 ) were ascribed to Fe 3+ . , The satellite peaks (donated as Sat.) observed at 731.6 and 720.2 eV are believed to correspond to Fe 2+ Sat.…”

“…And the two peaks located at 786.7 and 803.1 eV are satellite peaks. 21,22 For the Fe 2p spectra (Figure 3(c)), there are two peaks observed at 711.4 eV (Fe 2p 3/2 ) and 724.9 eV (2p 1/2 ), indicating the presence of Fe 2+ , while the peaks at 714 eV (Fe 2p 3/2 ) and 727.1 eV (2p 1/2 ) were ascribed to Fe 3+ . 23,24 The satellite peaks (donated as Sat.)…”

Research on Urea Oxidation Coupled with Electrolysis of Water to Produce Hydrogen Based on (NiFe)2P Catalyst

“…At present, only 1.5% of hydrogen supply is provided by electrolysis water in China. 3,4 The oxygen evolution reaction (OER) occurred at the anode of electrolysis water with a theoretical decomposition potential of 1.23 V. Resistance factors such as contact resistance, solution polarization, and solution resistance need to be optimized in the actual electrolysis of water, and even with the best active commercial noble metal catalysts, 5,6 the potentials exerted by the actual reaction still need to be 1.8-2.3 V in order to achieve the desired level of hydrogen production. 7 So OER is the key semireaction in the process of hydrogen production from water electrolysis, but its reaction pathway is complex, the energy barrier is high, and the kinetics is slow, which is also the bottleneck of hydrogen production from electrolysis water.…”