CoP nanoparticles deposited on reduced graphene oxide sheets as an active electrocatalyst for the hydrogen evolution reaction

Abstract

A novel CoP/RGO composite with excellent electrocatalytic activity towards HER was prepared using a facile two-step strategy.

Mesoporous composite nickel cobalt oxide/graphene oxide synthesized via a template-assistant co-precipitation route as electrode material for supercapacitors

“…As another evidence of enhanced performance, composite NCG-10 with the larger slope in the low frequency region delivers lower diffusion resistance described as Warburg impedance (Zp). These results confirm that the incorporation of GO could significantly improve the electrical performance of NCG composite [35].…”

“…6c, swept in a stable operational voltage of 0.5 V, with the increase of the scan rate, the peak currents increase and non-negligibly, the discrepancy of the two opposite redox peaks sharpens too as a result of the insufficient redox process under fast scan rates [42,43]. The pair of redox peaks can be observed in the potential range of 0e0.4 V from each CV curve, which is mainly aligned with the Faradaic redox reactions related to M-O/M-O-OH (M represents Ni or Co) [16,35]. The CV profile scanned at rate of 2 mV s À1 (Fig.…”

“…The relatively weak peak centered at about 522 cm À1 accords with mode of as-prepared NiCo 2 O 4 . The peaks at 380 cm À1 , 510 cm À1 , 522 cm À1 , 640 cm À1 are assigned to the E 2g , E g , F 2g , and A 1g modes of NiCo 2 O 4 , respectively [34,35].…”

Nickel phosphide nanoparticles-nitrogen-doped graphene hybrid as an efficient catalyst for enhanced hydrogen evolution activity

“…Likewise, it only needs overpotentials of 102 and 122 mV to achieve current densities of 10 and 20 mA cm À2 , respectively. Table S2 compares the catalytic activity of the Ni 2 P/N-RGO hybrid with some reported HER electrocatalysts, such as PCN@N-graphene [28], Fe 2 P/NGr [22], FeP/GSs [18], FeP NA/Ti [29], FeP NAs/CC [30], Co@NC/NG [31], CoSe 2 NW/CC [32], CoP/RGO-0.36 [33], CoP/CNT [34], CoP/Ti [35], CoP/CC [36], Ni 2 P/Ti [37], NiP 2 NS/CC [38], MoS x /NG [21], MoP/CF [39], MoP-CA2 [40], Cu 3 P NW/CF [41]. The potential of Ni 2 P/N-RGO hybrid compares favorably to the behavior of other supported transition metal phosphide catalysts in acidic media.…”

Recent Progresses in Electrocatalysts for Water Electrolysis

“…They can also be used as supports or in combination with other materials to enhance electrocatalytic activities [296,297].…”