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5 years ago

Active Sites Intercalated Ultrathin Carbon Sheath on Nanowire Arrays as Integrated Core–Shell Architecture: Highly Efficient and Durable Electrocatalysts for Overall Water Splitting

Active Sites Intercalated Ultrathin Carbon Sheath on Nanowire Arrays as Integrated Core–Shell Architecture: Highly Efficient and Durable Electrocatalysts for Overall Water Splitting
Licheng Sun, Yiqing Sun, Shuyan Cao, Yunzhen Wu, Jungang Hou
The development of active bifunctional electrocatalysts with low cost and earth-abundance toward oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) remains a great challenge for overall water splitting. Herein, metallic Ni4Mo nanoalloys are firstly implanted on the surface of NiMoOx nanowires array (NiMo/NiMoOx) as metal/metal oxides hybrid. Inspired by the superiority of carbon conductivity, an ultrathin nitrogen-doped carbon sheath intercalated NiMo/NiMoOx (NC/NiMo/NiMoOx) nanowires as integrated core–shell architecture are constructed. The integrated NC/NiMo/NiMoOx array exhibits an overpotential of 29 mV at 10 mA cm−2 and a low Tafel slope of 46 mV dec−1 for HER due to the abundant active sites, fast electron transport, low charge-transfer resistance, unique architectural structure and synergistic effect of carbon sheath, nanoalloys, and oxides. Moreover, as OER catalysts, the NC/NiMo/NiMoOx hybrids require an overpotential of 284 mV at 10 mA cm−2. More importantly, the NC/NiMo/NiMoOx array as a highly active and stable electrocatalyst approaches ≈10 mA cm−2 at a voltage of 1.57 V, opening an avenue to the rational design and fabrication of the promising electrode materials with architecture structures toward the electrochemical energy storage and conversion. Ultrathin nitrogen-doped carbon sheath intercalated NiMo/NiMoOx nanowires as integrated core–shell architectures are constructed as oxygen evolution reaction and hydrogen evolution reaction electrocatalysts. Due to the abundant active sites, high electrical conductivity, low charge-transfer resistance, and fast electron transfer configuration, the integrated NC/NiMo/NiMoOx electrocatalyst approaches 10 mA cm−2 at a voltage of 1.57 V, opening an avenue to the rational design of the promising electrode materials with architecture structures toward the electrochemical energy storage and conversion.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/smll.201702018

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