Carbon-Coated Nickel Phosphide Nanosheets as Efficient Dual-Electrocatalyst for Overall Water Splitting.
Carbon-Coated Nickel Phosphide Nanosheets as Efficient Dual-Electrocatalyst for Overall Water Splitting.
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DOI：
10.1021/acsami.6b10552
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发表时间：
2016-10
影响因子：
9.5
通讯作者：
Jing Yu;Qianqian Li;Na Chen;Chengyan Xu;L. Zhen;Jinsong Wu;V. Dravid
中科院分区：
文献类型：
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作者：
Jing Yu;Qianqian Li;Na Chen;Chengyan Xu;L. Zhen;Jinsong Wu;V. Dravid
低成本高效的水分解电催化剂在可再生能源和清洁能源领域有着广泛的应用需求。在这里，我们报道了一个简单的一步合成三维（3D）碳涂层Ni8P3纳米片阵列作为析氢反应（HER）和析氧反应（OER）的双功能催化剂。该纳米片阵列在HER和OER中均具有过电位低、电流密度大、Tafel斜率小的特点，具有较高的电催化活性和长期稳定性。高导电性的碳层既是防止Ni8P3溶解的保护层，又是降低电催化过电位的活性层。该纳米片阵列在酸性和碱性介质中均具有优异的HER活性。它在OER中的优异性能可能是由于Ni8P3/NiOx异质结处的协同相互作用。此外，电池电压低至1.65 V，可在碱性水电解槽中实现10 mA cm-2的电流密度，实现完全的水分解，这表明C@ Ni8P3作为双功能催化剂在清洁和可再生能源利用方面具有潜在的应用前景。
Low-cost and efficient electrocatalysts for overall water splitting are in high demand for a wide range of applications across renewable and clean energy. Here, we report a simple one-step synthesis of a three-dimensional (3D) carbon-coated Ni8P3 nanosheet array as bifunctional catalyst for both hydrogen evolution reactions (HER) and oxygen evolution reactions (OER). The nanosheet array possesses low overpotentials, high current densities, and small Tafel slopes in both HER and OER and shows high electrocatalytic activities and long-term stability. The carbon layer with high electric conductivity serves not only as a protective layer to prevent Ni8P3 dissolution but also as an active layer to decrease the electrocatalysis overpotential. The nanosheet array has HER outstanding activity in both acid and alkaline media. Its superior performance in OER can be due to the synergistic interaction at the Ni8P3/NiOx heterojunction. Furthermore, cell voltage as low as 1.65 V can achieve 10 mA cm-2 current density for full water splitting in an alkaline water electrolyzer, indicating potential application of C@ Ni8P3 as bifunctional catalyst for clean and renewable energy utilization.