Polyoxometalate derived p-n heterojunction for optimized reaction interface and improved HER  

作　　者：Xiaoli Cui Yunmeng Sun Xinxin Xu 

机构地区：[1]Department of Chemistry,College of Science,Northeastern University,Shenyang 110819,China [2]Institute for Frontier Technologies of Low-Carbon Steelmaking,Northeastern University,Shenyang 110819,China

出　　处：《Chinese Chemical Letters》2023年第3期494-497,共4页中国化学快报（英文版）

基　　金：supported by National Natural Science Foundation of China(No.22171039);Fundamental Research Funds for the Central University(No.N2025035)。

摘　　要：MoS_(2) is a typical electrocatalyst for hydrogen evolution reaction(HER),but the HER activity is spoilt by intensive adsorption towards H^(*),which requires further improvement.For n-type MoS_(2),the construction of p-n heterojunction with p-type MoO_(3) can reverse this situation,because inner electronic field in p-n heterojunction can facilitate H^(*) desorption.Based on this hypothesis,p-n heterojunction is built between MoS_(2) and MoO_(3) with polyoxometalate compound as precursor.The obtained MoO_(3)/MoS_(2) exhibits excellent HER activity,which only requires 68 mV to obtain 10 mA/cm^(2).With MoO_(3)/MoS_(2) as cathode material and Zn slice as anode,Zn-H^(+)battery is assembled.Its open circuit voltage achieves 1.11 V with short circuit current 151.4 mA/cm^(2).The peak power density of this Zn-H^(+) battery reaches 47.6 mW/cm^(2).When discharge at 10 mA/cm^(2),the specific capacity and energy density reach 728 mAh/g and 759 Wh/kg.In this process,H_(2) production rate of Zn-H^(+) battery achieves 364μmol/h with Faradic efficiency 97.8%.It realizes H_(2) production and electricity generation simultaneously.

关 键 词：POLYOXOMETALATE p-n Heterojunction ELECTROCATALYSIS HER Zn-H~+battery 

分 类 号：TQ116.2[化学工程—无机化工] TQ426