A Self‐Assembly Method‐Derived Mo_xC@N‐Doped Carbon Nanosheet Enabling Efficient Water Electrolysis

Abstract

Electrolysis of water is a promising reaction to produce the sustainable energy of hydrogen that proceeds commonly by assistance of a highly efficient catalyst. Now, the development of highly efficient and low‐cost electrocatalysts has stimulated increasing interest. Herein, a new composited electrocatalyst of Mo x C embedded in N‐doped carbon nanosheets (Mo x C@NCS) is successfully prepared from a self‐assembly route. Due to the expanded interlayers of carbon NCS and enhanced active defective sites induced by two‐materials compositing, the as‐synthesized Mo x C@NCS affords splendid hydrogen evolution reaction (HER, overpotential of 160 mV), as well as remarkable oxygen evolution reaction (OER, overpotential of 360 mV) at 10 mA cm−2 in alkaline water splitting. In view of earlier excellent performances, the bifunctional Mo x C@NCS catalyst shows a low cell voltage of 1.56 V at 10 mA cm−2 in overall water splitting. In addition, the Mo x C@NCS exhibits an outstanding stability after long‐term electrochemical measurements. These findings extend the potential application of carbon‐supported non‐noble metallic catalysts, being of great significance in sustainable energy‐related fields.

MoS2 Nanoflowers Grown on Plasma‐Induced W‐Anchored Graphene for Efficient and Stable H2 Production Through Seawater Electrolysis

“…b) Overpotential of the MoS 2 @W‐G composite, compared with those of other previously reported catalysts at 10 mA cm⁻ 2 . [ 17a,32–42 ] c) Tafel plots of MoS 2 @W‐G composites prepared at various ratios. d) Nyquist plots of the MoS 2 @W‐G composites, measured at an overpotential of 200 mV (inset: circuit diagram).…”

“…Notably, Figure 3b reveals that the HER activities of the MoS 2 @W‐G composites outperformed those of most previously reported non‐noble‐metal MoS 2 ‐, W‐, and carbon‐based catalysts in acidic media, including W 2 C/MWNT, [ 32 ] Ni/Mo 2 C‐PC, [ 33 ] Mo 2 C/WC/NG, [ 34 ] P‐WC x , [ 35 ] Mo x W 2‐x C, [ 17a ] Mo 2 C‐G, [ 36 ] Mo x C@NCS, [ 37 ] P‐WN/rGO, [ 38 ] P‐Mo 2 C@C, [ 39 ] Mo 2 C@CMF, [ 40 ] W 2 C@CNT, [ 41 ] and MoS 2 @W 2 C. [ 42 ] Table S1 (Supporting Information) lists some other details regarding the HER performance of these catalysts. To gain insight into the HER mechanism, we fitted the Tafel slope using the Tafel equation: $$$$\begin{equation}\eta = a + b\,log\left( j \right)\end{equation}$$$$…”

Fe‐Alloyed MoNi Nanohybrids as Oxygen Evolution Reaction/Oxygen Reduction Reaction Bifunctional Electrocatalyst for Rechargeable Zinc–Air Batteries

“…The potential of the redox peak and the area of the CV curve reflect the catalytic ability of the electrocatalyst. As exhibited in Figure a, the CV curves of the MoNiFe catalyst at 50 mV s −1 showed two pairs of redox peaks located at 1.384/1.341 and 1.447/1.429 V, respectively, while MoNi has only one pair of redox peaks (1.466/1.360 V), [ 39 ] indicating that catalytic activity of MoNi is enhanced by alloying through Fe.…”

A Mn single atom catalyst with Mn–N2O2 sites integrated into carbon nanosheets for efficient electrocatalytic CO2 reduction

“…However, more recent research efforts have aimed to develop easily prepared lower cost catalysts with metals more abundant in the Earth's crust, such as electrocatalysts with Cu, [13][14][15] Zn, [16][17][18] Ni, 19,20 Fe, 21,22 Co, [23][24][25][26] Mn, 27,28 and carbon materials. 29,30 Recently, single-atom catalysts (SACs) have attracted signicant attention due to their outstanding activity and higher selectivity compared to traditional catalysts. 31,32 Among the reported transition metal SACs, Mn SACs have shown good activity and high FE for the CO 2 RR.…”

“…However, more recent research efforts have aimed to develop easily prepared lower cost catalysts with metals more abundant in the Earth's crust, such as electrocatalysts with Cu, 13–15 Zn, 16–18 Ni, 19,20 Fe, 21,22 Co, 23–26 Mn, 27,28 and carbon materials. 29,30…”