Why is the peak efficiency of most charge pump less than boost converter,but still can be published in IEEE
Practical efficiency of charge pumps can be comparable to boost converters, often over 70%, sometimes much higher (over 90%). The theoretical efficiency is not 100% like those using an inductor, but that's of little importance in the real world.  

Charge pumps are important, to give one reason, because they can be integrated onto an IC chip, whereas boost converters would require an external inductor with current technology. So EEPROM and flash chips that require high voltage can be self-contained.