Hierarchical nanoassembly of Ni/MoS2@Ni12P5/ZnP2 achieved by a plasma assisted phosphorization with highly improved electrocatalytic activity for overall water splitting
Hierarchical nanoassembly of Ni/MoS2@Ni12P5/ZnP2 achieved by a plasma assisted phosphorization with highly improved electrocatalytic activity for overall water splitting
复制标题
DOI：
10.1016/j.electacta.2022.140392
复制
发表时间：
2022-04
影响因子：
6.6
通讯作者：
Zhuai Fu;Zhongqing Jiang;Ting-ting Hu;Zhongqing Jiang
中科院分区：
文献类型：
--
作者：
Zhuai Fu;Zhongqing Jiang;Ting-ting Hu;Zhongqing Jiang
本文中，在泡沫镍（NF）上生长的Zn单原子负载的MoS 2纳米片是通过MoS 2纳米片和ZIF-8的原位生长和高温碳化形成的。然后采用等离子体辅助磷化法制备了均匀分布在MoS 2纳米片表面的磷化镍（Ni 12 P5）和磷化锌（ZnP 2）异质结纳米颗粒（P-Ni/MoS2@Ni12P5/ZnP 2）。MoS 2纳米片生长在三维NF骨架上有利于提高电化学活性比表面积，异质结Ni 12 P5/ZnP 2纳米片的均匀分布暴露了更多的催化活性中心。此外，与传统的热磷化法（C-Ni/MoS2@Ni12P5/ZnP 2）相比，等离子体辅助磷化法制备的异质结Ni 12 P5/ZnP 2纳米粒子具有更小的尺寸和更强的电子耦合。因此，合成的P-Ni/MoS2@Ni12P5/ZnP 2在碱性溶液中对HER和OER都显示出优异的双功能催化活性，这通过在82 mV下提供10 mA cm-2的HER电流密度和360 mV下提供100 mA cm-2的OER的过电位来突出。P-Ni/MoS2@Ni12P5/ZnP 2具有比以往报道的大多数双功能催化剂更高的电催化性能和更好的稳定性。此外，作为双功能催化剂组装的P-Ni/MoS2@Ni12P5/ZnP 2的催化电流密度在1.62 V的低电池电压下迅速超过50 mA cm-2，超过了商业RuO 2-Pt/C耦合电解槽。
Herein, Zn single atom supported MoS2nanosheets growing on nickel foam (NF) is formed byin-situgrowth of MoS2nanosheets and ZIF-8 and high temperature carbonization. And then plasma-assisted-phosphorization is employed to obtain homogeneous nickel phosphide (Ni12P5) and zinc phosphide (ZnP2) heterojunction nanoparticles (NPs) distributed over the surface of MoS2nanosheets (P-Ni/MoS2@Ni12P5/ZnP2). The MoS2nanosheets growing on 3D NF framework benefits the increase of the electrochemically active specific surface, and the uniform distribution of heterojunction Ni12P5/ZnP2NPs exposes more catalytic active sites. Moreover, the heterojunction Ni12P5/ZnP2NPs obtained by plasma-assisted-phosphorization has smaller size and stronger electronic coupling than that synthesized by the conventional thermal phosphorization (C-Ni/MoS2@Ni12P5/ZnP2). Therefore, the as-synthesized P-Ni/MoS2@Ni12P5/ZnP2shows an excellent bifunctionality catalytic activity for both HER and OER in alkaline solutions, which is highlighted by the overpotential at 82 mV for delivering current density of 10 mA cm−2for HER and 360 mV for delivering 100 mA cm−2for OER. P-Ni/MoS2@Ni12P5/ZnP2exhibits higher electrocatalytic performance and better stability than most previously reported bifunctional catalysts. Furthermore, the catalytic current density of P-Ni/MoS2@Ni12P5/ZnP2as a bifunctional catalyst assembled single two-electrode-electrolyzer rapidly exceeded 50 mA cm−2at a low cell voltage of 1.62 V, surpassing the commercial RuO2-Pt/C coupled electrolyzer.