Enhanced photocatalytic hydrogen production activity of CdS coated with Zn-anchored carbon layer

Modification of Ni3N with a Cobalt-Doped Carbon Shell for High-Performance Hydrogen Evolution in Alkaline Media

“…Since the Tafel slopes of all electrocatalysts mentioned in Table are greater than 50 mV dec –1 in 1.0 M KOH, this indicates that the Volmer step is the rate-determining step for HER over the (Co–C)/Ni 3 N samples . A recent study has found that coating a thin layer of carbon onto the surface of a catalyst can effectively increase the rate of charge transfer, thereby increasing the rates of both the Volmer step and the Heyrovsky step. , Meanwhile, it has been reported that integrating transition metal particles into a carbon layer can effectively modify the electronic structure and charge distribution of the transition metal particles because electrons can be effectively transferred between the carbon layer and the transition metal atoms. , In this research we have applied this concept by dispersing amorphous cobalt in the carbon layer to improve the activity of Ni 3 N electrocatalysts for HER.…”

“…41,42 Meanwhile, it has been reported that integrating transition metal particles into a carbon layer can effectively modify the electronic structure and charge distribution of the transition metal particles because electrons can be effectively transferred between the carbon layer and the transition metal atoms. 43,44 In this research we have applied this concept by dispersing amorphous cobalt in the carbon layer to improve the activity of Ni 3 N electrocatalysts for HER.…”

Atomically confined calcium in nitrogen-doped graphene as an efficient heterogeneous catalyst for hydrogen evolution

“…In this research, EIS was carried out under visible light illumination and using a typical three-electrode setup. A smaller semicircle radius of an EIS curve generally means a lower charge transfer resistance and thus faster interface charge transmission of a photocatalyst ( Zheng et al., 2020 ; Shi et al., 2020 ; Yao et al., 2019 ). As shown in Figure 5 D, the Nyquist plots of Ca 1 -NG/CdS have much smaller semicircles than those of NG/CdS and bare CdS, suggesting a more efficient charge separation and transfer within Ca 1 -NG/CdS and, therefore, a better PHE performance.…”

“…As shown in Figure 5 E, the overpotential for Ca 1 -NG/CdS at −10 mA cm −2 is 0.62 V, much lower than those of NG/CdS (−0.76 V) and bare CdS (−0.90 V). (Note that a lower overpotential means a lower required activation energy for the HER (2H + (aq) + 2e − → H 2 (g)) ( Kweon et al., 2020 ) and is also favorable for photocatalytic H 2 production ( Shi et al., 2020 ; Yao et al., 2019 ; Luo et al., 2015 )). Additionally, the conduction band (CB) potentials of Ca 1 -NG and CdS were estimated to be −0.54 and −0.39 V (vs. NHE) using the Mott-Schottky method ( Figure S16 ).…”

CdS Microparticles Decorated with Bi0/BiOI Nanosheets for Visible Light Photocatalytic Hydrogen Evolution

“…Sun et al fabricated 1D/2D CdS nanorod@Ti 3 C 2 MXene and achieved an AQE of 2.28% . Shi et al coated a Zn-anchored carbon layer on CdS (CdS@Zn–C) and achieved an AQE of 13.1% at 420 nm . Zhao et al prepared TS-1/Pd/CdS and achieved an AQE of 16.5% at 420 nm .…”