A bifunctional and stable Ni-Co-S/Ni-Co-P bistratal electrocatalyst for 10.8%-efficient overall solar water splitting

作者：Zhou, Xiaoxue; Zhou, Ju; Huang, Guanping; Fan, Ronglei; Ju, Sheng; Mi, Zetian; Shen, Mingrong^*

来源：Journal of Materials Chemistry A, 2018, 6(41): 20297-20303.

DOI：10.1039/c8ta07197g

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Stable and cost-effective catalysts with low kinetic overpotentials for both the anodic oxygen evolution reaction (OER) and cathodic hydrogen evolution reaction (HER) are indispensable for the large-scale implementation of electrochemical water splitting. In this study, we developed an efficient, stable and bifunctional Ni-Co-S/Ni-Co-P bistratal electrocatalyst on Ni foam (NF) using simple electrodeposition methods. The efficient contact at the Ni-Co-P/NF interface along with the porous Ni-Co-S surface results in the superior electrocatalytic activity of the bistratal layer in a basic solution for both the OER and HER. Only -0.11 V vs. RHE is required at a current density of -20 mA cm(-2) for the HER and 1.47 V vs. RHE at 50 mA cm(-2) for the OER, significantly outperforming bare Ni-Co-S or Ni-Co-P on NF. Most crucially, when functioning as a bifunctional catalyst for overall water splitting, a small cell potential of 1.49 V can drive 10 mA cm(-2) which can be sustained for more than two days. Subsequently, 10.8%-efficient overall solar water splitting was achieved when driven by three ordinary Si solar cells. Such a bistratal structure is expected to provide a new platform for the design of highly efficient, low-cost and durable catalysts for water electrolysis systems.

• 出版日期2018-11-7
• 单位苏州大学