研究廉价且高效的水分解电催化剂对于氢能源的开发利用具有重要意义,过渡金属磷化物是最有前景的水分解双功能电催化剂之一.本研究采用先水热法,再低温磷化的简单的两步合成法,在三维镍网上生长CoP纳米珠链阵列,所生成的镍网(Nickel foam,NF)负载CoP纳米珠线阵列(CoP/NF),具有规则的形貌、较大的比表面积,在碱性条件下对氢气析出反应(HER)和氧气析出反应(OER)都表现出良好的电催化性能.在电流密度达到10 mA/cm2时的过电位分别为280 mV(OER)及95 mV(HER).利用此CoP/NF复合材料组成的双电极体系可以有效电解水,在电流密度为10 mA/cm2时所需的施加电压仅为1.63 V,并且表现出非常高的稳定性.%The research for efficient and low-cost electrocatalysts for water splitting are essential for the exploitation and application of hydrogen energy. Transitional metal phosphides are considered as one of the most promising bifunctional water splitting electrocatalysts. Herein, we reported a facile two-step method (firstly hydrothermal preparation, then phosphorization under low temperature) to synthesize the bead-chain like nanoarrays of CoP supported on three dimensional Nickel foam (CoP/NF). The as-prepared CoP/NF could act as an efficient bifunctional catalyst for overall water splitting. The catalyst exhibited remarkable activity for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in alkaline media,delivering a current density of 10 mA/cm2at an overpotential of 281 mV for OER and 95 mV for HER, respectively. Efficient water splitting in alkaline system was realized by applying a two-electrode system with the CoP/NF acting as both the anode and cathode. The applied potential was 1.63 V to obtain the current density of 10 mA/cm2,and good stability was also testified.
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