Details

Autor(en) / Beteiligte

• Yang, Linjing
• Zeng, Lili
• Liu, Hui
• Deng, Yunqie
• Zhou, Ziqian
• Yu, Jiayuan
• Liu, Hong
• Zhou, Weijia

Titel

Hierarchical microsphere of MoNi porous nanosheets as electrocatalyst and cocatalyst for hydrogen evolution reaction

Ist Teil von

• Applied catalysis. B, Environmental, 2019-07, Vol.249, p.98-105

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Access via ScienceDirect (Elsevier)

Beschreibungen/Notizen

• [Display omitted] •The uniform hierarchical microspheres MoNi synthesized from reducing NiMoO4.•The MoNi HM exhibited a superior HER activity with a onset potential of −7 mV.•The MoNi HM was used as cocatalyst for photocatalytic HER with rate of 151.7 μmol mg−1 h−1.•This study revealed a process for building highly efficient electrocatalyst and cocatalyst. In industrial water electrolysis cell, the electrocatalyst has a sluggish water dissociation kinetics leading to low electrocatalytic activity for the generation of H2 from water splitting. This work reports a hierarchical microsphere constructed by MoNi porous nanosheets derived from NiMoO4 microsphere, as a rapid Tafel-step-decided electrocatalyst towards hydrogen evolution reaction (HER). Consequently, the synthesized MoNi hierarchical microsphere (MoNi HM) electrocatalyst exhibits an onset potential of as small as −7 mV vs. RHE, an operating potential of 72 mV for 10 mA cm−2, and a low Tafel slope of 36.6 mV per decade in 1.0 M KOH. Furthermore, MoNi HM as cocatalyst and CdS nanowires as photocatalyst are physically mixed (MoNi HM/CdS NWs) and presentes a champion photocatalytic performance for H2 production with a prominent H2 generation rate of as high as 151.7 μmol mg-1 h−1 at λ > 420 nm light illumination. The large contact area between MoNi nanosheets and CdS nanowires endows the fast separation of photogenerated charge carriers to significantly facilitate the photocatalytic H2 production.