Synthesis of N doped NiZnCu-layered double hydroxides with reduced graphene oxide on nickel foam as versatile electrocatalysts for hydrogen production in hybrid-water electrolysis
Synthesis of N doped NiZnCu-layered double hydroxides with reduced graphene oxide on nickel foam as versatile electrocatalysts for hydrogen production in hybrid-water electrolysis
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DOI：
10.1016/j.jpowsour.2020.227872
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发表时间：
2020-03
影响因子：
9.2
通讯作者：
Shengnan Hu;Y. Tan;C. Feng;Huimin Wu;Jiujun Zhang;He Mei
中科院分区：
文献类型：
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作者：
Shengnan Hu;Y. Tan;C. Feng;Huimin Wu;Jiujun Zhang;He Mei
水分解受到阳极析氧反应（OER）高理论势的限制，从而降低了能量效率。然而，用低理论电位的氨氧化反应（AOR）、尿素氧化反应（UOR）、肼氧化反应（HzOR）代替缓慢的氧析出是一种节能方法。本文以泡沫镍为载体，制备了一种新型的N掺杂NiZnCu水滑石/还原氧化石墨烯双功能催化剂（N-NiZnCu LDH/rGO）。为了验证其电化学性能和稳定性，构建了双电极电解槽（N-NiZnCu LDH/rGO|| N-NiZnCu LDH/rGO）。实验表明，在10 mA cm-2的电流密度下，AOR、UOR和HzOR的电压分别为0.489 V、1.305 V和0.010 V，并且具有高稳定性（超过3000次CV循环），这比Pt/C的电压要好得多||IrO2。本研究表明N-NiZnCu LDH/rGO可替代贵金属用于混合水电解制氢，并可用于工业废水的处理。
Water splitting is limited by the high theoretical potential of oxygen evolution reaction (OER) at anode, which can reduce the energy efficiency. Nevertheless, replacing sluggish oxygen evolution by ammonia oxidation reaction (AOR), urea oxidation reaction (UOR), hydrazine oxidation reaction (HzOR)) of low theoretical potential is an energy-saving approach. In this paper, a new bifunctional catalyst of N doped NiZnCu-layered double hydroxides with reduced graphene oxide on nickel foam (N–NiZnCu LDH/rGO) is synthesized. To validate its electrochemical performance and stability, a two-electrode electrolyzer is constructed (N–NiZnCu LDH/rGO||N–NiZnCu LDH/rGO). Experiments show that at a current density of 10 mA cm−2, the voltages of AOR, UOR, and HzOR are 0.489 V, 1.305 V, and 0.010 V with a high stability (over 3000 CV cycles), which are much better than those of Pt/C||IrO2. This study demonstrates N–NiZnCu LDH/rGO can replace precious metals for commercial hydrogen energy production in the hybrid-water electrolysis, and can be employed for treatment of industrial wastewater.