泡沫镍基Ni-P-W-Mo析氢电极的制备与电化学性能  

Preparation and electrochemical properties of Ni-P-W-Mo hydrogen evolution electrode based on nickel foam

作　　者：代晓梅 何捍卫[1] DAI Xiaomei;HE Hanwei(Powder Metallurgy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金研究院,长沙410083

出　　处：《粉末冶金材料科学与工程》2022年第6期610-619,共10页Materials Science and Engineering of Powder Metallurgy

摘　　要：以硫酸镍、次亚磷酸钠、钨酸钠、钼酸钠等为原料,采用一步恒电流电沉积法在泡沫镍基底上合成Ni-P-W-Mo析氢电极,借助X射线衍射、扫描电镜、能谱仪、X射线光电子能谱以及电化学测试等手段研究材料的表面形貌、元素组成以及电化学析氢性能。结果表明,Ni-P-W-Mo析氢电极在碱性溶液中析氢催化时有出色的催化活性和稳定性,仅需92 mV的过电位即可达到10 mA/cm2的电流密度,比Ni-P电极降低67 mV,电极的双层电容为42.98 mF/cm2,经过2 000次循环伏安(cyclic voltammetry, CV)测试后,析氢活性略微下降。Ni-P-W-Mo电极优异的催化性能可能是由于W、Mo的添加使电极的表面形貌更粗糙,电化学活性表面积和活性位点显著增加,同时自支撑电极结构可以有效降低界面传输电阻,提高电荷传输效率。Nickel sulfate, sodium hypophosphite, sodium tungstate, and sodium molybdate were used as raw materials to synthesize Ni-P-W-Mo hydrogen evolution electrode on nickel foam by one-step galvanostatic electrodeposition method.The surface morphology, elemental composition, and electrochemical hydrogen evolution properties of the materials were investigated by means of X-ray diffraction, SEM, Energy X-ray spectrometry, X-ray photoelectron spectroscopy and electrochemical testing. The results show that Ni-P-W-Mo electrode has excellent catalytic activity and stability after catalyzed hydrogen evolution in alkaline solution. The current density of 10 mA/cm~2 can be reached only at 92 mV over potential, which is 67 mV lower than that of Ni-P electrode. The double-layer capacitance of Ni-P-W-Mo electrode is 42.98 mF/cm~2. After 2000 cyclic voltammetry cycles, the hydrogen evolution activity of the electrode decreases only slightly. The excellent catalytic performance of Ni-P-W-Mo electrode may be due to the addition of W and Mo elements to the Ni-P electrode which makes the electrode surface coarser, greatly increasing the electrochemical active surface area and active site of the electrode. Meanwhile, the self-supported electrode structure can effectively reduce the interfacial transmission resistance and improve the charge transmission efficiency.

关 键 词：过渡金属磷化物 Ni-P-W-Mo电催化剂 电沉积 析氢反应 泡沫镍 

分 类 号：TK91[动力工程及工程热物理]